Sino-Inst manufactures and supplies a range of pressure transmitters. This covers negative pressure transmitters, absolute pressure transmitters, high vacuum absolute pressure transmitters, etc.

The high vacuum absolute pressure transmitter uses imported metal film capacitor and ionization gauge technology. The minimum range can be extended to 200Pa to achieve true high vacuum pressure measurement.
The negative gauge pressure transmitter uses a MEMS diffused silicon sensor. Through range migration and equipped with a dedicated signal processing unit, accurate measurement of negative pressure can be achieved. The product has stable performance and long service life, and the measuring range can be selected arbitrarily between 0~-100KPa.
It can be specially designed and customized according to the specific requirements of users to meet various practical application needs.

Featured Pressure and Vacuum Transmitters

FAQs

Can pressure transmitters measure vacuum?

Pressure transmitters do measure vacuum. Pressure transmitters designed specifically for measuring vacuum are capable of measuring pressure levels below atmospheric pressure and are often referred to as vacuum pressure transducers.

How does a negative pressure transmitter work?

The working principle of a negative pressure transmitter is usually to use pressure sensing elements (such as piezoelectric, capacitive, strain gauge, etc.) to sense the pressure difference, and then convert the physical pressure changes into electrical signals. In a negative pressure environment, the sensing element of the transmitter will deform accordingly according to the magnitude of the negative pressure, thereby changing the resistance, capacitance or other electrical performance parameters. These changes are converted into a standard electrical signal output through the signal processing circuit, such as 420mA. Or 05V, etc. to facilitate pressure monitoring and control.

How many PSI is full vacuum?

A complete vacuum is a state without any gas molecules at all, and its pressure is zero. In pressure measurement, atmospheric pressure is usually used as the reference. The standard value of atmospheric pressure is 14.696 PSI (pounds per square inch), so the pressure in a full vacuum state can be considered to be 0 PSI. In technical applications, this complete vacuum state is difficult to achieve. What is often called “full vacuum” is a relative term. In fact, there may be very slight pressure.

Are vacuum pressure transducers and negative pressure transducers the same?

Vacuum pressure transducers and negative pressure transducers have similarities in application, but there are differences between them.

Vacuum pressure transducers are usually used to measure pressure below atmospheric pressure, mainly for measuring vacuum. Its measurement range is usually from standard atmospheric pressure (101.325 kPa) to absolute zero pressure, which is a complete vacuum state.

Negative pressure transducers are used to measure pressure below atmospheric pressure but not reaching a vacuum state, also called negative pressure or negative differential pressure. Its measurement range is usually from above atmospheric pressure to some low pressure value, but not to a complete vacuum.

Both are devices that work at standard atmospheric pressure and are used for pressure measurement in low-pressure environments of varying degrees. When selecting equipment, you need to determine whether to use vacuum pressure transducers or negative pressure transducers according to the pressure range of the specific measurement environment.

What are the types of pressure sensors?

Pressure sensors can be classified based on the range of pressures they measure over the operating temperature range and, most importantly, the type of pressure they measure. Pressure sensors have different names depending on their purpose, but the same technology may be used under different names.

1. Absolute pressure sensor
   • This pressure sensor measures pressure relative to a complete vacuum.

2. Gauge pressure sensor
   • This pressure sensor measures pressure relative to atmospheric pressure. A tire pressure gauge is an example of a gauge pressure measurement; when it indicates zero, it is measuring the same pressure as the ambient pressure.

3. Vacuum pressure transducers
   • Used to describe sensors that measure pressure below atmospheric pressure, showing the difference between low and atmospheric pressure, but can also be used to describe sensors that measure absolute pressure relative to a vacuum.

4. Differential pressure sensor
   • This sensor measures the difference between two pressures, one attached to each side of the sensor. Differential pressure sensors are used to measure many properties. For example, pressure drop across an oil filter or air filter, fluid level (by comparing the pressure above and below the fluid), or flow rate (by measuring the change in pressure within a limited range). Technically, most pressure sensors are actually differential pressure sensors; for example, a gauge pressure sensor is just a differential pressure sensor with one side open to the surrounding atmosphere.

More About: Unraveling the Pressure Puzzle: Absolute Pressure vs Gauge Pressure

pressure conversion tools

Tools for converting and calculating pressure values. Help users choose suitable pressure sensors and transmitters!

Absolute pressure-Gauge pressure Converter	Pressure Unit Converter	Liquid Depth/Level to Hydrostatic Pressure Calculator
Differential Pressure Calculator	Pressure Transducer 4-20ma Output Calculator	Pressure to Liquid Level Calculator

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In many industrial situations, a closed environment needs to be evacuated. At this time, the vacuum pressure transducers can be used to detect the vacuum degree of the closed environment in real time. Generally, vacuum pressure transducers that measure negative pressure have the function of detecting negative pressure and positive pressure at the same time.

We at Sino-Inst are professional pressure transmitter manufacturers. We offer over 50 types of pressure transmitters. Can measure gauge pressure and absolute pressure. Negative pressure, vacuum, differential pressure, etc. Features a variety of analog outputs including 4-20ma, 0-10 VDC and 0.5-4.5 VDC proportional outputs. We also offer industry-proven rugged vacuum sensor designs and flexible, low-cost and reliable OEM solutions.

Do you need the right equipment to measure vacuum pressure? Please feel free to contact our sales engineers for consultation!

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