Pressure Sensor/Transmitter/Transducer

Many may confused about differences among, pressure sensor, pressurer transducer and pressure transmitter in varying degree. Those three terms are interchangable under certain context. Pressure sensors and transducers could be distinguished through output signal. The former could be described with a 4-20mA output signal while the later with a millivolt signal. In other words, the proper term could be determined according output signal and application.

Pressure Sensor

Pressure sensor is a general term for all pressure types, a device used to measure pressure. In typical, the millivolt output signal keeps strong signal without loss when such a device is installed 10-20 feet away from the electronics. A 5VDC supply with a 10mV/V output signal produces a 0-50mV output signal. Older technology only produce 2-3mV/V (millivolts per volt) while the state-of-the-art is able to produce  20mV/V reliably. Millivolt output signals spare spaces for engineers to regulate the output signal according to specific system needs and reduce package size as well as cost.

Pressure Transducer

Pressure transducer output is high level voltage or frequency signal including 0.5 4.5 V ratiometric, 1 - 5 V and 1 - 6 kHz. Output singal is proportional to the supply in general. Voltage output signals are able to offer low current consumption for remote batter operated equipment. Supply voltages ranging from 8-28 VDC requires a 5VDC regulated supply, except for the 0.5 - 4.5V output. A tricky problem of older voltage output signals lies in no "live zero", there is signal when the sensor is at zero pressure. The older system often fail to figure out the difference between a failed sensor with no output and zero pressure.

Pressure Transmitter

Pressure transmitter works through current measurement of the device rather the voltage. The most obvious character is current output signal 4-20mA. Lonnmeter pressure transmitters are designed to monitor pressure of vessels, pipelines or tanks in real time. 4-20mA pressure transmitters offer good electrical noise immunity (EMI/RFI), and will need a power supply of 8-28VDC. Because the signal is producing current, it can consume more battery life if operating at full pressure.

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