Temperature transmitter is an instrument that converts a temperature variable into a standardized output signal that can be transmitted. Output signal 4~20mA two wires.

The temperature transmitter adopts thermocouple and thermal resistance as the temperature measuring element. The output signal from the temperature measuring element is sent to the transmitter module. After voltage stabilization filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse After protection and other processing, it is converted into 4～20mA, 0-5V/0-10V signal, RS485 digital signal output.

Temperature Transmitter 4-20mA

SBWR thermocouple temperature transmitter, and SBWZ thermal resistance temperature transmitter are field-mounted temperature transmitter units in thermocouple and thermal resistance series instruments.

The SI-SBW series integrated temperature transmitter, is a perfect combination of temperature sensor and transmitter.

It converts the temperature signal in the range of -200~+1600 °C, into two-wire 4~20mA DC signal transmission in a very simple way.

Accurate measurement and control of temperature for displays, regulators, recorders, DCS, etc.

RTD Temperature Transmitter

An RTD Temperature Transmitter (Resistance Temperature Detector or Resistance Temperature Device) is one of the most prevalent temperature sensors used in industry today.

Also commonly referred to as PT100/PT1000, its resulting popularity is due to its accuracy and repsonse, at temperatures between -300 to + 600 ° C.

Industrial thermal resistance is used as a temperature measuring sensor. It is usually used with instruments, recorders, and electronic regulators.

Field Mounted HART Temperature Transmitter

The Series SI-SBW HART® temperature transmitter is a 2-wire transmitter, with an analog output.

It has measurement input for resistance thermometers (RTD) in 2-, 3- or 4-wire connections, thermocouples, resistance and voltage inputs.

The transmitter can be programmed with a PC or HART® protocol hand-held terminal.

These small units can be mounted in Pyromation DIN (Form B) connection heads, or they can be used for surface mounting by using a 35 mm DIN-rail mounting clip.

Extended reading: RTD vs. Thermocouple: What’s the Difference, and Which Should You Use?

What is a temperature transmitter

Temperature transmitter is a device that converts physical measurement signals or ordinary electrical signals into standardized electrical signal output or can be output by means of communication protocols. Mainly used for measurement and control of temperature parameters in industrial processes. The current transmitter converts the AC current of the main circuit under test into a constant current loop standard signal, which is continuously transmitted to the receiving device.

The temperature variable is transformed into the appearance of a transmittable standardized output signal (4-20mA is common in industry).

The temperature transmitter uses thermocouple and thermal resistance as the temperature measuring element. The output signal from the temperature measuring element is sent to the transmitter module. Through voltage stabilization filter, calculation expansion, nonlinear calibration, V/I conversion, constant current and reverse After maintenance and other circuit processing.

Extended reading:  Tri Clamp Sanitary Thermometers

Temperature Transmitter Working Principle

The heat balance is achieved through conduction or convection, so that the indication value of the thermometer can directly indicate the temperature of the measured object. Generally, the measurement accuracy is high.

Within a certain temperature range, the thermometer can also measure the temperature distribution inside the object. But for moving objects, small targets or objects with small heat capacity, larger measurement errors will occur.

The temperature transmitter generally consists of a temperature measuring probe, that is, a thermocouple or thermal resistance sensor and a two-wire solid electronic unit. The temperature measuring probe is directly installed in the junction box in the form of a solid module to form an integrated transmitter.

Temperature transmitters are widely used in industries, agriculture, commerce and other sectors.

With the wide application of cryogenic technology in national defense engineering, space technology, metallurgy, electronics, food, medicine and petrochemical sectors, and the research of superconducting technology.

Low-temperature thermometers that measure temperatures below -153°C have been developed, such as low-temperature gas thermometers and vapor pressure thermometers.

Sino-Inst, Manufacuturer for Temperature Transmitters, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Temperature Transmitters, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

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Bimetallic thermometer is an on-site temperature detection instrument for measuring low and medium temperatures.

The bimetal thermometer is based on a bimetallic sheet wound into a circular bending shape. When one end is heated and expanded, it drives the pointer to rotate, and the working instrument displays the temperature value of the thermoelectric potential. Bimetal thermometer is an on-site temperature detection instrument for measuring low and medium temperatures. It can directly measure the temperature of liquid, steam and gaseous media in the range of -80℃~+500℃ in various production processes.

Main technical parameters of Bimetallic Thermometers

1. Product implementation standard: JB/T8803-1998;
2. Nominal diameter of dial: 60,100,150;
3. Accuracy grade: (1.0), 1.5;
4. Thermal response time: ≤40s;
5. Protection level: IP55;
6. Angle adjustment error;
   The angle adjustment error should not exceed 1.0% of its range;
7. Return difference: The return difference of the thermometer should not be greater than the absolute value of the basic error limit;
8. Repeatability: The repeatability limit range of the thermometer should not be greater than 1/2 of the absolute value of the basic error limit;
9. Temperature measurement range

Bimetallic thermometer of electric contact point

The electric contact bimetal thermometer is used in the production site to automatically control and alarm the temperature. Directly measure the temperature of body, steam and gaseous media in the range of -80℃~+500℃ in various production processes.

The electric contact bimetal thermometer uses the temperature change to drive the contact change when it is in contact with or disconnected from the upper and lower limit contacts. At the same time, the relay in the circuit is activated, thereby automatically controlling and alarming.

Explosion proof electric contact bimetallic thermometer

The bimetal thermometer can directly measure the temperature of body, steam and gas medium and solid surface in the range of -80℃~+500℃ in the process of explosives such as hydrocarbons and other explosives at the production site.

Main technical parameters

• Nominal diameter of dial: 100
• Thermal response time: ≤40s
• Explosion proof grade: dⅡBT4
• Rated power: 10VA
• Maximum operating voltage: 220V
• Maximum operating current: 0.7A

Remote Bimetallic thermometer

The bimetal thermometer and thermocouple (resistance) are integrated. It not only meets the needs of on-site temperature measurement, but also meets the needs of long-distance transmission. It can directly measure the temperature of liquid, steam and gas medium and solid surface in the range of -80℃~+500℃ in various production processes.

Main technical parameters

1. Nominal diameter of dial: 100, 150
2. Thermal response time: ≤40s
3. Accuracy grade: (1.0), 1.5
4. Thermocouple; Class I, 1.5℃; Class II, 2.5℃
5. Thermal resistance: Class A, ±(0.15+0.005 ItI) Class B, ±(0.30+0.005 ItI)
6. Protection level: IP55

Digital Thermometer/Transmitter

Digital Thermometer/Transmitter is practically used to measure medium and low temperature field detection instruments. It can be used to directly measure the temperature of gases such as liquids. Compared with glass mercury thermometers, it has the advantages of no mercury hazard, easy reading, strong and durable. It can directly replace double Metal, pressure type, glass mercury thermometer, etc. At the same time, the defects of bimetal thermometers cannot be bent and used restrictions are changed.

For the installation of bimetal thermometers, attention should be paid to accurate temperature measurement, safety and reliability, and convenient maintenance. And it does not affect equipment operation and production operations.

The above requirements must be met. When choosing the installation location and insertion depth of the thermal resistance, pay attention to the following A few points:

(1) In order to have sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measurement point should be selected reasonably and try to avoid installing thermal resistance near the dead corner of the valve, elbow, pipeline and equipment.

(2) Thermal resistors with protective sleeves have heat transfer and heat dissipation losses. In order to reduce measurement errors, thermocouples and thermal resistors should have sufficient insertion depth:

a. For the thermal resistance measuring the temperature of the fluid in the center of the pipeline. Generally, the measuring end should be inserted into the center of the pipeline (vertical installation or inclined installation). If the pipe diameter of the fluid to be measured is 200 mm, the insertion depth of the thermal resistance should be 100 mm;

b. For temperature measurement of high temperature, high pressure and high speed fluids (such as main steam temperature). In order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid.

The shallow insertion method of the protective tube or the hot sleeve type can be adopted Thermal resistance. Shallow plug-in thermal resistance protection sleeve, the depth of its insertion into the main steam pipe should not be less than 75mm. The standard insertion depth of thermal resistance is 100mm;

c. If you need to measure the temperature of the flue gas in the flue. Although the flue diameter is 4m, the insertion depth of the thermal resistance is 1 m;
d. When measuring the original insertion depth more than 1m, it should be installed vertically as far as possible. Or add support frame and protective sleeve.

Sino-Inst, Manufacuturer for Thermal Resistances, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Thermal Resistances, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Thermal resistance is the most commonly used temperature detector in the medium and low temperature areas.

Thermal resistance is based on the characteristic that the resistance value of a conductor or semiconductor changes with temperature to measure temperature and temperature-related parameters. Thermal resistors are mostly made of pure metal materials. Currently, platinum and copper are the most widely used. Materials such as nickel, manganese and rhodium have been used to make thermal resistance. Thermal resistance usually needs to transmit the resistance signal to the computer control device or other secondary instruments through the lead.

Sheathed thermal resistance

Sheathed thermal resistance uses the feature that when the
temperature of the material changes, its resistance will change too. When the resistance changes, the instrument will display relevant temperature corresponding to the resistance.

It is usually used along with display instruments, recording
instruments, electronic computers and so on. It is able to directly measure the temperature of liquid, steam and gas and solid surface within the range of -200℃～500℃.

Tolerance level

Assembling thermal resistance

The assembled PT100 thermal resistance is assembled by thermal resistance/platinum resistance element, metal protection tube, magnesium oxide insulating powder, and extension wire.

The product has a simple structure and a wide range of applications. This method is used in most thermal resistance temperature measurement occasions. According to the requirements of different customers, it is made of wear-resistant, anti-corrosion, explosion-proof, waterproof and high-temperature resistant types.

1. With temperature-sensing element of pressure spring type, so it has good anti-vibration performance;
2. With no compensation wire, which is cost-saving
3. High measurement accuracy;
4. High mechanical strength, good pressure resistance;
5. Imported thin-film resistor with reliable and stable performance;

Explosion-proof thermal resistance

Explosion-proof thermal resistance is based on the principle of explosion-proof material gap. Design the junction box and other components with sufficient strength. All parts that generate sparks, arcs and dangerous temperatures are sealed in the junction box cavity. When an explosion occurs in the cavity, The flame can be extinguished and cooled through the gap of the joint surface, so that the flame and temperature after the explosion can not be transmitted to the outside of the cavity. Therefore, explosion-proof.

Range of temperature measurement and the error tolerance

Evidence list

PT100

Pt100 is a platinum thermal resistance, its resistance is proportional to the change of temperature. It is often used for temperature detection in low temperature areas. It realizes the functions of industrial field temperature control signals of one input and two output, and one input and four output.

Pt100 platinum thermal resistance is currently widely used in high-precision temperature equipment such as medical, electrical, industrial, temperature calculation, resistance calculation, etc.

The main types of thermal resistance:

①Ordinary thermal resistance

From the temperature measurement principle of the thermal resistance, the change of the measured temperature is directly measured by the change of the resistance of the thermal resistance. Therefore, the change of the resistance of various wires such as the lead wire of the thermal resistance will affect the temperature measurement.

②End surface thermal resistance

The end-face thermal resistance temperature-sensing element is wound by a specially treated resistance wire, which is closely attached to the end face of the thermometer. Compared with general axial thermal resistance, it can reflect the actual temperature of the measured end surface more accurately and quickly. It is suitable for measuring the end surface temperature of bearing bushes and other mechanical parts.

③Armored thermal resistance

The armored thermal resistance is a solid body composed of temperature sensing elements (resistors), lead wires, insulating materials, and stainless steel sleeves. Its outer diameter is generally φ2–φ8mm, and the smallest can reach φmm.
Compared with ordinary thermal resistance, it has the following advantages:

1. Small size, no internal air gap, thermal inertia, small measurement lag;
2. Good mechanical properties, vibration resistance and impact resistance;
3. It can be bent and is easy to install;
4. Long service life.

④Explosion-proof thermal resistance

Explosion-proof thermal resistance through the junction box of special structure, the explosion of explosive mixed gas inside the shell due to the influence of sparks or arcs is confined in the junction box, and the production site will not cause excessive explosion. Explosion-proof thermal resistance can be used for temperature measurement in places with explosion hazard in Bla-B3c level zone.

The difference between thermal resistance and thermocouple

Difference 1: The principle of temperature measurement is different

Thermal resistance temperature measurement is based on the characteristic that the resistance value of a metal conductor increases with temperature. Its main features are high measurement accuracy and stable performance. Among them, the measurement accuracy of platinum thermal resistance is the highest. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument.

The thermocouple welds two conductors or semiconductors A and B of different materials to form a closed loop. When there is a temperature difference between the two attachment points 1 and 2 of the conductors A and B, an electromotive force is generated between the two. Thus, a large current is formed in the loop. This phenomenon is called the thermoelectric effect.

Difference 2: The classification of thermocouple and thermal resistance is different.

The common thermal resistance materials are mostly single metal. The most widely used thermal resistance materials are platinum and copper. Platinum resistance has high precision, good stability, and certain nonlinearity. The higher the temperature, the smaller the resistance change rate. Copper resistance There is a linear relationship between the resistance value and the temperature in the temperature measurement range, the number of temperature lines is large, and it is easy to be oxidized if it exceeds 150. The index numbers of the thermal resistance are Cu50, Pt100, Pt1000, etc. The letter in the front refers to the material of the thermal resistance, and the number behind is the resistance value of the thermal resistance.

A thermocouple is composed of two different conductors (called thermocouple wires or thermoelectrodes) connected at both ends into a loop. The common K-type thermocouple is composed of nickel-chromium-nickel silicon. Standardized thermocouples China Since January 1, 1988, thermocouples and thermal resistances have all been produced in accordance with IEC international standards. Seven standardized thermocouples of S, B, E, K, R, J, and T are designated as China’s unified design. Thermocouple.

Difference 3: Different temperature range

Thermal resistance is a commonly used temperature sensor in the middle and low temperature areas. It is divided into platinum thermal resistance, copper thermal resistance, etc. The temperature measurement range is also different. In general, thermal resistance can measure the temperature from -200 to 600 ℃.

Compared with the thermal resistance, the temperature measurement range of the thermocouple is much larger. The B-type thermocouple with the largest temperature measurement range can even measure the temperature of 0-1800 ℃. The ordinary K-type thermocouple can also measure Temperature of -40-1200℃. But because the measurement of thermocouple in low temperature area is not very accurate. Therefore, it is more appropriate to use thermal resistance when measuring lower temperature.

Difference 4: Different connection methods

There are currently three main ways to connect thermal resistance: two-wire, three-wire, and four-wire. The accuracy of the two-wire system is relatively low, while the four-wire system is more used for accurate measurement in the laboratory. Most of our commonly used thermal resistances are three-wire systems. This is because the circuit for measuring thermal resistance is generally an unbalanced bridge. A three-wire system is used. One wire is connected to the power terminal of the bridge. The other two are connected to the heat. The bridge arm where the resistance is located and the bridge arm adjacent to it. This can eliminate the measurement error caused by the wire line resistance, and greatly improve the accuracy.

Thermocouples are not so particular about thermal resistance. They are all two-wire systems. Unlike thermal resistance, the output resistance of thermocouple is mV signal.

Sino-Inst, Manufacuturer for Thermal Resistances, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Thermal Resistances, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Thermocouples are often used to measure the temperature of liquid, steam and gaseous media and solid surface temperatures.

Thermocouples are commonly used temperature measuring components in temperature measuring instruments. It directly measures temperature and converts the temperature signal into a thermoelectromotive force signal. It is converted into the temperature of the measured medium by electrical instruments. Thermocouples are usually composed of main parts such as hot electrodes, insulating sleeve protection tubes and junction boxes. Usually used with display instruments, recording instruments and electronic regulators.

Sheath Thermocouple

It is usually used along with display instruments, recording instr-uments, electronic computers and so on. It is able to directly me-asure the temperature of liquid, steam and gas and solid surfacein a variety of production processes within the range of 0 ~1300℃.

The electrode of sheath thermocouple are consisted by two different materials of conductor. When there is a temperature difference between the measuring end and the reference end. It will generate the thermal electric potential. The working instrument will show the corresponding temperature value of the thermal electric potential.

Range for temperature measurement and error-tolerance

Extended reading: LN2 tanks sensor

Assembled Sheathed Thermocouple

Product Applications

• Cooling and heating systems
• Water supply and water heating systems
• Air-conditioning systems
• Automation system temperature mensuration and control
• Suited for temperature measurement in industrial environments, especially around motors, generators and other high voltage equipment.
• Widely used in the injection molding mold.

Temperature measurement range and tolerance error

Explosion-proof Thermocouple

Explosion-proof thermocouple uses the principle of interval
explosion-proof with the junction box and other parts with enough strength where the dangerous parts which will generate spark, electric arc and dangerous temperature are sealed, so when the explosion occurs inside the cavity, the flame of the explosion can be cooled and distinguished in the gap between the joint surface so that the flame and the temperature will not be passed to the cavity.
Finally, the explosion-proof is realized.

Explosion-proof thermocouple Temperature measurement range

Read More About: Difference Between Class 1 Div 1 And Class 1 Div 2

Platinum Rhodium Thermocouple

The platinum rhodium thermocouple is a traditional temperature measuring element. It has stable thermoelectric performance and strong oxidation resistance, and is suitable for continuous use in an oxidizing and inert atmosphere. The long-term use temperature is 1600℃, and the short-term use temperature is 1800℃. The technical indicators are as follows:

1. Temperature measurement range: 0~1800℃
2. Temperature measurement accuracy: <± 0.5% t
3. Time constant: ≤180s
4. Insulation resistance: 5MΩ (at 20℃)
5. Specification and size: 500, 750, 1000, 1200 (mm)

K-type Thermocouple

The K-type thermocouple is used as a temperature sensor. The K-type thermocouple is usually used with display instruments, recording instruments and electronic regulators.

The K-type thermocouple can directly measure the surface temperature of liquid vapor, gaseous media and solids in various production ranges from 0℃ to 1300℃.

K-type thermocouple is the cheapest metal thermocouple with the largest consumption at present, and its consumption is the sum of other thermocouples.

• The diameter of K-type thermocouple wire is generally 1.2mm～4.0mm.
• The nominal chemical composition of the positive electrode (KP) is: Ni:Cr=90:10, the nominal chemical composition of the negative electrode (KN) is: Ni:Si=97:3, and its service temperature is -200℃~1300℃.
• The K-type thermocouple has the advantages of good linearity, high thermoelectromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, and low price. It can be used in oxidizing inert atmosphere and widely used by users.
• K-type thermocouples cannot be directly used in sulfur, reducing or reducing, oxidizing alternate atmospheres and vacuum at high temperatures, nor are they recommended for use in weakly oxidizing atmospheres.

Thermocouple Types

Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples.

The so-called standard thermocouple refers to a thermocouple with a unified standard indexing table that specifies the relationship between the thermoelectric potential and the temperature, the allowable error, and the national standard. It has a matching display instrument for selection.
Non-standardized thermocouples are inferior to standardized thermocouples in use range or order of magnitude. Generally, there is no unified indexing table. It is mainly used for measurement in some special occasions.

Standardized thermocouples China started from January 1, 1988. Thermocouples and thermal resistances are all produced in accordance with IEC international standards. Seven standardized thermocouples of S, B, E, K, R, J, and T are designated as China’s unified design. Thermocouple.

In theory, any two different conductors (or semiconductors) can be made into thermocouples. However, as a practical temperature measuring element, there are many requirements for it.

In order to ensure the reliability in engineering technology and sufficient measurement accuracy. Not all materials can form a thermocouple. Generally, the basic requirements for the electrode material of a thermocouple are:

1. In the temperature measurement range, the thermoelectric properties are stable. It does not change with time. It has sufficient physical and chemical stability and is not easy to be oxidized or corroded;
2. Low temperature coefficient of resistance, high conductivity, low specific heat;
3. The thermoelectric potential generated in temperature measurement should be large, and the relationship between thermoelectric potential and temperature is linear or close to linear single value function;
4. Good reproducibility of materials. High mechanical strength, simple manufacturing process and low price.

Sino-Inst, Manufacuturer for Thermocouples, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Thermocouples, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

Bimetallic thermometer is a kind of field testing instrument for measuring low and medium temperature. It is used especially in industry.

It can directly measure the temperature of the liquid, vapor and gas within -80℃~+500℃ in a variety of production processes. The bimetallic thermometer is made of a metal sheet which is made into a ring and bend shape. When one end is heated and expanded, it will lead to the rotation of the pointer and the working instrument will show the temperature value of the thermal electric potential.

How Does a Bimetallic Thermometer Work?

The working principle of bimetallic thermometer depends on the two fundamental properties of the metal.The metal has the property of thermal expansion, i.e., the metal expand and contract concerning the temperature.The temperature coefficient of all the metal is not same. The expansion or contraction of metals is different at the same temperature.

What Is WSS Series Bimetallic Thermometer And Its Uses?

WSS series bimetallic thermometer is an on-site detection instrument for measuring low and medium temperature. The bimetal thermometer can directly measure the temperature of liquid, steam and gaseous media in the range of -80℃～+500℃ in various production processes.

What Is The Meaning Of Bimetallic?

They are made up of bimetallic strips formed by joining two different metals having different thermal expansion coefficients. Basically, bimetallic strip is a mechanical element which can sense temperature and transform it into a mechanical displacement. This mechanical action from the bimetallic strip can be used to activate a switching mechanism for getting electronic output. Also it can be attached to the pointer of a measuring instrument or a position indicator. Various techniques such as riveting, bolting, fastening can be used to bond two layers of diverse metals in a bimetallic strip. However the most commonly used method is welding. Since two metals are employed to construct a bimetallic strip, hence they are named so.

Read more about Thermometer

Characteristics

1. It can display the temperature on-site, which is intuitive and convenient;
2. It is safe and reliable with long service life;
3. With a variety of structural forms, which can meet different requirements.

Main Technical Parameters

• 1.Product implementation standard:JB/T8803-1998
• 2.Nominal diameter of dial：60,100,150
• 3.Precision grade：（1.0）,1.5
• 4.Thermal response time：≤40s
• 5.Protection level：IP55
• 6.Angle adjustment error Angle adjustment error should not more than 10% of the range
• 7. Return difference: the return difference of the thermometer should not be more than the absolute value of the error limitation.
• 8. Repeatability: the repeatability of the thermometer should be no greater than 1/2 of the absolute value of the basic error limitation.

Classification

According to the connection direction of the bimetal thermometer dial and the protective tube, the bimetal thermometer can be divided into four types: axial type, radial type, 135°direction type and universal type.

1. Axial bimetal thermometer: The pointer plate is connected vertically to the protection tube.
2. Radial type bimetal thermometer: The pointer disc is connected in parallel with the protection tube.
3. 135°direction bimetallic thermometer: the pointer disc and the protection tube are connected at 135°.
4. Universal bimetal thermometer: The connection angle between the pointer plate and the protective tube can be adjusted arbitrarily.

WSS-420 WSS-520 WSS-421 WSS-521 WSS-422 WSS-522 WSS-432 WSS-532 WSS-424 WSS-524 WSS-425 WSS-525 WSS-526

WSS-300 WSS-400 WSS-500 WSS-301 WSS-401 WSS-501 WSS-302 WSS-402 WSS-502 WSS-303 WSS-403 WSS-503 WSS-304 WSS-404 WSS-504 WSS-305 WSS-405 WSS-505 WSS-306 WSS-406 WSS-506

WSS-310 WSS-410 WSS-510 WSS-311 WSS-411 WSS-511 WSS-312 WSS-412 WSS-512 WSS-313 WSS-413 WSS-513 WSS-314 WSS-414 WSS-514 WSS-315 WSS-415 WSS-515 WSS-316 WSS-416 WSS-516

WSS-480 WSS-580 WSS-481 WSS-581 WSS-482 WSS-582 WSS-483 WSS-583 WSS-484 WSS-584 WSS-485 WSS-585 WSS-586 WSS-486

Installation Requirements

For the installation of bimetal thermometers, attention should be paid to accurate temperature measurement, safety and reliability, and convenient maintenance, and does not affect equipment operation and production operations. The above requirements must be met. When selecting the installation position and insertion depth of the thermal resistance, the following should be paid attention to A few points:

(1) In order to have sufficient heat exchange between the measuring end of the thermal resistance and the measured medium, the location of the measurement point should be selected reasonably and try to avoid installing thermal resistance near the dead corner of the valve, elbow, pipeline and equipment.

(2) The thermal resistance with protective sleeve has heat transfer and heat dissipation loss. In order to reduce the measurement error, the thermocouple and thermal resistance should have sufficient insertion depth:

• a. For the thermal resistance measuring the temperature of the fluid in the center of the pipeline, the measuring end should generally be inserted into the center of the pipeline (vertical installation or inclined installation). If the pipe diameter of the tested fluid is 200 mm, the insertion depth of the thermal resistance should be 100 mm;
• b. For temperature measurement of high-temperature, high-pressure and high-speed fluids (such as main steam temperature), in order to reduce the resistance of the protective sleeve to the fluid and prevent the protective sleeve from breaking under the action of the fluid, the shallow insertion method of the protective tube or the hot sleeve type can be adopted Thermal resistance. For shallow plug-in thermal resistance protection sleeves, the depth of insertion into the main steam pipe should not be less than 75mm; the standard insertion depth of thermal-jacket thermal resistance is 100mm;
• c. If you need to measure the temperature of the flue gas in the flue, even though the flue diameter is 4m, the thermal resistance insertion depth is 1m;
• d. When the insertion depth of the measuring original exceeds 1m, it should be installed vertically as much as possible, or a support frame and protective sleeve should be installed.

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What Is Thermal Resistance?

Thermal resistance is one of the most commonly used temperature detectors in medium and low temperature regions.

Thermal resistance thermometry is based on the characteristic that the resistance value of metal conductors increases with temperature. Its main features are high measurement accuracy and stable performance.

Among them, the measurement accuracy of platinum thermal resistance is the highest. It is not only widely used in industrial temperature measurement, but also made into a standard benchmark.

Thermal resistances are mostly made of pure metal materials. The most widely used are platinum and copper. In addition, materials such as nickel, manganese and rhodium have been used to manufacture thermal resistances.

There are many types of temperature-sensing materials commonly used in metal thermal resistors, and platinum wire is the most commonly used.

In addition to platinum wire, metal thermal resistance materials for industrial measurement include copper, nickel, iron, iron-nickel, etc.

RFQ Thermal Resistance

Features of Thermal Resistance

• Stable physical and chemical properties, high measurement accuracy, corrosion resistance and long service life.
• The temperature coefficient of resistance should be large, that is, the sensitivity should be high.
• The resistivity should be high to make the thermal resistance smaller and reduce the time constant of temperature measurement.
• The heat capacity should be small, so that the thermal inertia of the resistor body is small and the response is more sensitive.
• Good linearity, that is, the relationship between resistance and temperature is linear or a smooth curve.
• It is easy to process, inexpensive, and reduces manufacturing costs.
• Good reproducibility, easy for mass production and parts interchange.

Measuring Principle of Thermal Resistance

The temperature measurement principle of thermal resistance is different from that of thermocouple in that thermal resistance measures temperature based on the thermal effect of resistance. That is, the resistance of the resistor body changes with temperature.

Therefore, as long as the resistance change of the temperature-sensing thermal resistance is measured. temperature can be measured. There are mainly two types of metal thermistors and semiconductor thermistors.

The resistance value and temperature of a metal thermal resistor can generally be expressed by the following approximate relationship.
That is, Rt=Rt0[1+α(t-t0)]

where:
Rt is the resistance value at temperature t;
Rt0 is the corresponding resistance value at temperature t0 (usually t0=0℃);
α is the temperature coefficient.

The relationship between the resistance value and temperature of the semiconductor thermistor is: Rt=AeB/t

where Rt is the resistance value when the temperature is t;
A and B are constants that depend on the structure of the semiconductor material.

In comparison, the thermistor has a larger temperature coefficient. The resistance value at room temperature is higher (usually in the thousands of ohms). But the interchangeability is poor and the nonlinearity is serious. The temperature measurement range is only about -50~300℃. It is widely used in temperature detection and control for home appliances and automobiles.

Learn more: Thermal resistance From Wikipedia

Common Types of Thermal Resistance

Thermal Resistance vs Thermal Conductivity

Thermal conductivity, also known as “thermal conductivity”. [1] is a measure of the thermal conductivity of a material. The symbol is λ or K.
It refers to the heat transferred through the unit horizontal cross-sectional area per unit time when the vertical downward gradient of the temperature is 1°C/m.

Its specific definition is: take two parallel planes with a distance of 1 meter and an area of 1 square meter inside the object perpendicular to the direction of heat conduction. If the temperature difference between the two planes is 1K, it will be conducted from one plane to another within 1 second. The amount of heat is specified as the thermal conductivity of the substance. Its unit is: watt · m-1 · Kai-1 (W · m-1 · K-1).

If there is no heat loss, for a block material with parallel opposite sides, there is
E/t=λA(θ2-θ1)/ι

In the formula, E is the energy transferred in the time t. A is the cross-sectional area. ι is the length. θ2 and θ1 are the temperatures of the two sections, respectively.

In general there are:
dE/dt=-λAdθ/dι

Thermal Resistance Example Problems

Temperature Range And Tolerance Level

Thermal Resistance With No-fixed Device

WZP-120 WZP -120 2 WZP-120G WZP -120G 2 WZP-121 WZP -121 2 WZP- 121G WZP -121G 2 WZP- 130 WZP -130 2 WZP- 130G WZP -130G 2 WZP- 131 WZP -131 2 WZP- 131G WZP -131G 2 WZC-120G WZC-120 WZC-130 WZC-130G WZC-121 WZC-121G WZC-131 WZC-131G

1) Model 120 and 121 are anti-spring type with the protective grade being IP65; Model 130 and 131 are waterproof type with the protective grade grade being IP55. 2) Protective tube material is 1Cr18Ni9Ti and the rest of the material is ordered according to the agreement.

Fixed Screw Type Thermal Resistance

WZP-220 WZP -220 2 WZP-220G WZP -220G 2 WZP-221 WZP -221 2 WZP- 221G WZP -221G 2 WZP- 230 WZP -230 2 WZP- 230G WZP -230G 2 WZP- 231 WZP -231 2 WZP- 231G WZP -231G 2 WZC-220 WZC-220G WZC-230 WZC-230G WZC-221 WZC-221G WZC-231 WZC-231G

1) Model 220 and 221 are anti-spraying type with the waterproof grade being IP65. model 230 and 231 are waterproof type with the protective grade being IP55. 2) Protective tube material is 1Cr18Ni9Ti and the rest of the material is ordered according to the agreement. 3) Nominal pressure is ≤4.0MPa.

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Miniature thermocouples are smaller than armored thermocouples. It has more advantages, such as: bending, high pressure resistance, fast thermal response time, sturdiness and durability, etc.

Miniature thermocouples are the same as armored thermocouples and assembled thermocouples. As a sensor for measuring temperature. They are usually used in conjunction with display instruments, recorders and electronic regulators. At the same time, miniature thermocouples can also be used as assembly thermocouples. Temperature sensing element. Temperature probes for applications with tight space requirements, limited access or other considerations. Typical miniature thermocouple applications include analytical instrumentation and medical devices.It is an indispensable temperature-measuring device in textile, tape and other industries.

It can directly measure the temperature of liquid, steam and gas medium and solid surface in the range of 0℃～600℃ in various production processes. are especially suitable for temperature measurement and control in narrow and bending places. Widely used in chemical, chemical fiber and pharmaceutical industries

Technical Parameters

• Accuracy level: I or II [plus or minus 1.5 degrees below 375° is the first level standard. Plus or minus 2.5 degrees is the secondary standard]
• Nominal diameter: Φ1 Φ0.5 Φ0.35 [generally the smallest outer diameter]

The Main Technical Parameters Of Miniature Thermocouples

• Models and Specifications Accuracy grade: I or II
• Nominal diameter: Φ1
• Bending radius: R≥5D
• Nominal pressure: normal pressure

About Temperature

The Celsius Temperature Scale (°C) Stipulates:

Under standard atmospheric pressure, the melting point of ice is 0°C, the boiling point of water is 100°C, and the middle is divided into 100 equal parts, each divided into 1°C, the symbol is °C.

The Fahrenheit Temperature Scale (℉) Stipulates:

Under standard atmospheric pressure, the melting point of ice is 32 degrees, the boiling point of water is 212 degrees, and the middle is divided into 180 equal parts, and each equal part is 1 degree Fahrenheit. The symbol is ℉.

The Thermodynamic Temperature Scale (symbol T)

The thermodynamic temperature scale (symbol T) is also called the Kelvin temperature scale (symbol K), or absolute temperature scale, which stipulates that the temperature when the molecular motion stops is absolute zero.

Principle Of Operation

Model And Specifications Of Miniature Thermocouples

Extended reading:  Tri Clamp Sanitary Thermometers

Miniature Thermocouple Connectors

Standard and miniature connectors are used with thermocouples, extension wires and compensation cables. No false thermal EMFs are created in the connection. Uncompensated miniature copper connectors are also available.

All contacts are polarized. to ensure proper connection. And these connectors are fully compatible with RS thermocouples and thermocouple wiring products of the same type.

Uses: Suitable for thermocouple and RTD connectors.
Suitable for fine wire and mineral insulated cables.

Material
a) Thermoplastic (200℃)
b) Thermosetting (350℃)
C) Ceramic (650℃)

More Featured Temperature Transmitters

About Sheathed thermocouple: Sheathed thermocouple can directly measure the temperature of liquid, steam and gaseous media and solid surfaces in the range of 0℃～1200℃ in various production processes. Sheathed thermocouples are usually used along with display instruments, recording instruments, electronic computers and so on. It is able to directly measure the temperature of liquid, steam and gas and solid surface in a variety of production processes within the range of 0 ~1300℃.

Extended reading: RTD vs. Thermocouple: What’s the Difference, and Which Should You Use?

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Sino-Inst, Manufacuturer for Thermocouples, like: Armoured thermocouple, assembly thermocouple, explosion-proof thermocouple, etc.

Sino-Inst’s Thermocouples, made in China, Having good Quality, With better price. Our Temperature measurement instruments are widely used in China, India, Pakistan, US, and other countries.

Request a Quote

Sheathed thermocouple have the advantages of bending, high pressure resistance, fast thermal response time and durability.

Sheathed thermocouple can directly measure the temperature of liquid, steam and gaseous media and solid surfaces in the range of 0℃～1200℃ in various production processes.

Sheathed thermocouples are usually used along with display instruments, recording instruments, electronic computers and so on. It is able to directly measure the temperature of liquid, steam and gas and solid surface in a variety of production processes within the range of 0 ~1300℃.

Advantages

1. Less thermal response time,which can reduce the dynamic error.
2. Flexible mounting for use.
3. Wide measuring scope.
4. High mechanical strength and good pressure resistance.

There are actually many techniques for using sheathed thermocouples.

• It has bendable performance. The thermal resistance of the sheath can be bent in any direction . except for the head, so it is suitable for the temperature of the complicated structure and small equipment.
• The sheathed thermocouple has good vibration and impact resistance. Therefore, its life is longer than ordinary thermal resistance.
• The sheathed thermocouple has a long service life. Because the resistance body of the sheathed thermal resistance is maintained by the metal sleeve, the thermal resistance wire is not easily corroded by harmful media.
• It is suitable for measuring in strong alkali and corrosive medium. with a temperature resistance of 250℃, and the fixed installation situation can also use the same PTFE fixed thread.
• According to the measurement temperature range and side measurement object, select the appropriate thermal resistance model, specification and maintenance tube information.

What Is Sheathed Thermocouple?

Sheathed thermocouples consist of an outer metallic sheath, which contains the insulated internal leads, embedded within a high-density ceramic compound (mineral-insulated cable, also called MI cable). Sheathed thermocouples are bendable and may be bent to a minimum radius of five times the sheath diameter.

Learn more about Thermocouple from Wikipedia.

What Are The Types Of Sheathed Thermocouple?

Sheathed thermocouples have different types. Type J, K, T, & E are “Base Metal” thermocouples, the most common types of thermocouples. Type R, S, and B are “Noble Metal” thermocouples, which are used in high temperature applications (see thermocouple temperature ranges for details)

Extended reading:  Tri Clamp Sanitary Thermometers

Can You Overheat a Sheathed Thermocouple?

• In terms of the sheath thermocouple, the environment temperature is 20 + 15℃, the relative humidity is not more than 80%, the test voltage is 500 + 50V(DC), the insulation resistance between electrode and outer sleeve≥1000MΩ.m.
• That is to say, the insulation resistance for sample of 1m is 1000MΩ;
• the insulation resistance for sample of 10m is 100MΩ.

Sheathed Thermocouple’s Working Principle

The electrode of sheath thermocouple are consisted by two different materials of conductor. When there is a temperature difference between the measuring end and the reference end, it will generate the thermal electric potential. The working instrument will show the corresponding temperature value of the thermal electric potential.

How Do You Identify A Sheathed Thermocouple?

If the flame ignites and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that’s the sign of a thermocouple malfunction. Before jumping to the conclusion that the thermocouple is at fault, look at the pilot flame.

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SI-WSS Bottom Connect Bimetal Thermometer

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KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

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