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Selection of Pressure Sensors - Focus on Microfluidic Control Technology

Pressure sensor, pressure transmitter type and selection:
Pressure sensors and pressure transmitters are divided into gauge pressure, pressure drop, differential pressure and other types. Common 0.1, 0.2, 0.5, 1.0 and other accuracy levels. Measurable pressure range is very wide, as small as tens of millimeters of water column, large up to 100 megapascals. Different types of pressure sensors and pressure transmitters have different operating temperature ranges and are often divided into 0~70°C, -25~85°C, -40~125°C, -55~150°C levels, and some special pressure sensors. Working temperature up to 400 ~ 500 °C.
Pressure sensors and pressure transmitters have different waterproof performance and explosion-proof grades based on different materials and structural designs. The fluid-filled cavity can be measured by the difference in materials and appearance. The type of fluid media can also be different. It is often divided into dry gas and general liquid. , acid and alkali corrosion solutions, flammable gas liquids, viscous and special media. Pressure sensor and pressure transmitter as a primary instrument need to be used with secondary instrument or computer. The common power supply methods for pressure sensor and pressure transmitter are: DC 5V, 12V, 24V, ±12V, etc. Output mode: 0~ 5V, 1~5V, 0.5~4.5V, 0~10mA. 0~20mA. 4~20mA etc. and Rs232, Rs485 and other interfaces with the computer.
When selecting the pressure sensor and pressure transmitter, the user should fully understand the working conditions of the pressure measurement system, choose according to the need, make the system work in the best condition, and reduce the project cost.
Pressure sensor common precision parameters and test equipment
Static sensor calibration equipment: Piston pressure gauge: Accuracy better than 0.05% Digital pressure gauge: Accuracy better than 0.05% DC power supply: Accuracy is better than 0.05%.
Sensor temperature test equipment: high temperature test chamber: temperature from 0 °C ~ +250 °C temperature control accuracy of ± 1 °C
Low temperature test chamber: Temperature control accuracy from 0°C to -60°C is ±1°C
Sensor static performance test items: zero output, full-scale output, nonlinearity, hysteresis, repeatability, zero drift, over-charge.
Sensor environment test items: zero temperature drift, sensitivity drift, zero hysteresis, and sensitivity delay. (Check the product's ability to adapt to temperature within the specified temperature range. This parameter is extremely important for accuracy)
Pressure sensor use matters needing attention
Pressure sensors and pressure transmitters should read the product sample and instruction manual before installation and use. The pressure interface should not be leaked during installation to ensure that the range and wiring are correct. The shell of the pressure sensor and pressure transmitter generally needs to be grounded, and the signal cable must not be mixed with the power cable, and strong electromagnetic interference should be avoided around the pressure sensor and the pressure transmitter. Pressure sensors and pressure transmitters shall be periodically inspected in accordance with industry regulations during use.

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