1. Temperature
Excessive temperature is one of the common causes of differential pressure sensor failure, as there are many components of the differential pressure sensor that can only function properly within the specified temperature scale. During installation, sensors that are exposed to temperatures beyond these temperatures can be negatively impacted.
2. Voltage spikes
Voltage spikes are voltage transients that exist for a short period of time. Although this high-energy surge voltage lasts only a few milliseconds, it can still cause damage to the sensor. Voltage spikes are difficult to spot unless they are of a significant origin, such as from lightning.
3. Fluorescent illumination
Fluorescent lamps require high pressure to arc to break down argon and mercury at high pressure, which heats the mercury into a gaseous state. This start-up voltage spike can pose a potential risk to differential pressure sensors. In addition, the magnetic field generated by fluorescent illumination may induce a voltage to act on the sensor wires, which may be mistaken for the actual output signal by the control system. Therefore, the sensor should not be placed under or adjacent to fluorescent illumination.
4. EMI/RFI
Differential pressure sensors are used to convert pressure into an electrical signal and are therefore susceptible to electromagnetic radiation or electrical disturbances. While sensor manufacturers have made every effort to ensure that their sensors are protected from the adverse effects of external disturbances, there are specific sensor plans that should reduce or prevent the effects of EMI/RFI (electromagnetic turbulence/radio frequency turbulence).
5. Shocks and oscillations
Shocks and oscillations can cause a variety of problems, such as dented housings, broken wires, circuit board cracking, signal faults, intermittent failures, and shortened lifetimes.
It is advocated that the sensor be installed as far away as possible from significant sources of shock and oscillation. Another possible workaround is to use a vibro isolator, depending on the installation method.
6. Overvoltage
Once the machine is assembled, care should be taken to prevent overvoltage issues. There are many causes of overpressure, including water hammer effect, accidental heating of the system, regulator failure, etc.
If the pressure value occasionally reaches the upper limit, the differential pressure sensor will be able to accept it and return to its original state. However, when the pressure value reaches the rupture pressure, this can cause the sensor diaphragm or housing to burst, causing leakage. The pressure value between the upper limit of the withstand voltage and the rupture pressure may cause the diaphragm to deform, causing output drift.
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