It’s difficult to obtain an ideal accuracy if choosing range is not matched actual situation. For example, we don’t suggest use a 1000bar range of pressure sensor on measuring 1bar pressure, it would be better if you could use 10bar range instead of 1000bar. Therefore, choosing the right measurement range is very important and efficient for you. Three major factors must to be taken into account:
① Operating Pressure Range: Pressure measuring range the sensor can be safely operated. ② Operating Mode: Absolute pressure, or gauge pressure ③ Maximum Pressure or Burst Pressure: The maximum value of pressure that can be withstood by the sensor without damaging itself. If the applied pressure is more than this maximum pressure value, it might result in device failure or inaccurate signal output, even damage the sensor itself, which named burst pressure. ④ Output Type: It could be Ratio-metric mV, 4~20mA, 0.5Vdc~4.5Vdc, 0~5Vdc, 0~10Vdc, digital I2C and digital SPI. ⑤ Full Scale: Maximum pressure that the sensor can measure from zero pressure. ⑥ Operating Temperature Range: The temperature range the sensor can operate reliably and provide an accurate output signal.
Output types of pressure sensors include the following four types: ① Ratiometric Millivolt Output(mV): Pressure sensor with ratiometric millivolt output are widely used in many applications because of their cost-effective nature. The full scale output of a millivolt sensor is from 40mV（Min.）to 120mV(Max.); 70mV (Typ.) under power of 5VDC or Idd=1.5mA. The output is directly proportional to the excitation power. ② Current Loop Output(4~20mA): These are pressure sensors with a current output of 4-20 mA. Since this kind of signal outputs are not much affected by electrical noise, the signals can be transmitted over a long distance. ③ Analog Voltage Output(Vdc). These are pressure sensors with a voltage output of 0.5~4.5Vdc, 0~5Vdc, and 0~10Vdc etc, which could be easily read by PCL, controller or indicator. ④ Digital output: The output signal in the case of a digital signal of I2C, SPI with digital code for pressure output values.
1. Application and measurement type. Common type of pressure measurement include: Absolute, gauge, differential, vacuum, bidirectional, and sealed gage. 2. Pressure range. kPa, Bar,Psi, Mpa 3. Process media. Water, Oil, Gas etc 4. Temperature range and installation environment. -30~80℃ etc. 5. Accuracy. ±0.25%F.S. 6. Output. 4~20mA, mV, 0.5~4.5Vdc etc
The base body is made of stainless steel. The resistance structure is produced by photolithography. Thin-film measuring cells stand out due to their excellent resistance to pressure peaks and bursting pressure.
Electronic pressure measurement requires a sensor that records the pressure to be measured and converts it into an electrical signal. Due to the large output signals and the established manufacturing processes, as well as the many years of experience gained, piezoresistive technology has become established in pressure measurement.
Transducers generally convert energy from one form to another, although the energy is typically a signal. They are routinely used in automated systems, which are often controlled by measurements of physical quantities such as force, motion, temperature and pressure. A sensor is a specific type of transducer that senses a physical property of its environment and reports that change, typically in the form of an electrical signal. For example, a pressure sensor detects pressure and reports it to a gauge that displays the pressure.
With the rise in smart watches and navigation systems, absolute pressure sensors find homes wherever elevation above sea level (altimeter measurement) is required. Weather stations also use them for barometric pressure measurements.
Tips show how a Milli voltage-output pressure sensor, Voltage-output pressure transducer or Current-output pressure transmitter be connected to a programmable logic controller (PLC) or meter to monitor pressure in a typical industrial equipment or process control application.
Industrial pressure sensors also referred to as pressure transducers, pressure transmitters, pressure indicators and pressure switches, normally have a diaphragm type design that uses strain gauges, which are either bonded to or diffused into it, with the strain gauges acting as resistive elements.