Q: What are the types of pressure sensors?

Depending on the type of pressure to be measured: Pressure transmitter types include gauge pressure, absolute pressure, and differential pressure. Gauge pressure refers to the pressure that is less than or greater than atmospheric pressure based on the atmosphere. Absolute pressure refers to the absolute zero pressure as the reference and is higher than the absolute pressure. Differential pressure refers to the difference between two pressures. According to the working principle of the pressure transmitter: Strain Gauge Pressure Transducers Capacitance Pressure Transducers Potentiometric Pressure Transducers Resonant Wire Pressure Transducers

Question 1

What are the types of pressure sensors?

Accepted Answer

Depending on the type of pressure to be measured:
Pressure transmitter types include gauge pressure, absolute pressure, and differential pressure. Gauge pressure refers to the pressure that is less than or greater than atmospheric pressure based on the atmosphere. Absolute pressure refers to the absolute zero pressure as the reference and is higher than the absolute pressure. Differential pressure refers to the difference between two pressures.
According to the working principle of the pressure transmitter:
Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

Question 2

How much does a pressure sensor cost?

Accepted Answer

First of all, the parameters that must be seen when purchasing a pressure transmitter are:
Pressure range. Range. Measurement medium. Installation method-threaded flange clamps, etc. Installation dimensions. Temperature. Whether with display. Whether with HART protocol. Output type. Current output or voltage output. Explosion-proof level, protection level. Accessories. Mounting bracket.
The above parameters will affect the price of the pressure transmitter.
Sino-Inst, as the manufacturer of pressure transmitter, offer you with the best price.

Question 3

What are different types of MEMS pressure sensors?

Accepted Answer

At present, there are mainly two types of MEMS pressure sensors: silicon piezoresistive pressure sensors and silicon capacitive pressure sensors. Both of these are micro-mechanical electronic sensors produced on silicon chips.

The first type: silicon piezoresistive pressure sensor

The silicon piezoresistive pressure sensor uses a Wheatstone bridge composed of high-precision semiconductor resistance strain gauges as the measurement circuit for electromechanical conversion. It has the advantages of high measurement accuracy, low power consumption, and low cost. The output of the piezoresistive sensor in the wheatstone bridge is zero. If there is no pressure change, there is almost no power consumption.

The MEMS silicon piezoresistive pressure sensor is the inner wall of a silicon membrane with a circular stress cup fixed around it. Using MEMS technology, four high-precision semiconductor strain gauges are directly engraved on the place with the largest surface stress to form a Wheatstone measurement bridge. As an electromechanical conversion measurement circuit, it directly converts the physical quantity of pressure into electrical energy. Its measurement accuracy can reach 0.01-0.03%FS.

The second type: capacitive pressure sensor

The capacitive pressure sensor uses MEMS technology to make a horizontal grid shape on a silicon wafer. The upper and lower horizontal grids form a set of capacitive pressure sensors. The upper horizontal grid moves downward under pressure to change the distance between the upper and lower horizontal grids and the capacitance between the plates, that is Pressure = Capacitance.

MEMS pressure sensors can adopt the design technology and manufacturing process similar to integrated circuits, so as to carry out high-precision, low-cost mass production, and have a wide range of applications in ventilators, automobiles, earphones, mobile phones and other fields.

Month: May 2020

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