Pressure sensor
Pressure sensors are devices used in a variety of applications requiring precise and accurate pressure measurement of gases or liquids. A pressure sensor senses pressure and converts it into an electric signal where the amount depends upon the pressure applied. In air conditioning and refrigeration systems, the pressure sensors are usually installed on suction and discharge pipe lines. In industry, using of two groups of pressure sensors are more common:
- Current output pressure sensors
- Voltage output pressure sensors
Voltage output
In voltage output pressure sensor, which call usually pressure transducer, there is high level voltage or frequency output signal including 0.5 to 4.5V ratiometric, 1-5V and 1-6kHz. Supply voltage is typically from 8-28VDC, expect for 0.5 – 4.5V output, which requires a 5VDC regulated supply. Today, most of transducer has 0.5-4.5V outputs. Because in 0-5VDC output there is not live zero and the system does not know the difference between a failed sensor with no output and zero pressure. Pressure transducer has three wires.
Current output
In current output pressure sensor, which called pressure transmitter, output of devise is current signal, regularly 4-20mA. Pressure transmitter offer good electrical noise immunity rather than pressure transducer voltage output and will need 8-28VDC power supply. Since 4-20mA signal is least affected by electrical noise and resistance in the signal wires, transmitter is best choice when the signals must be transferred long distance. Pressure transmitter has two wires. Manufacturers do not always or consistently differentiate between pressure transducer and pressure transmitter, and are simply called pressure sensor.
Pressure sensors are used in refrigeration and HVAC systems with electronic controllers. In following link you can find more information about these type of controllers.
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