Suitable for Ford Motor Oil Pressure Sensor 1839415C91

Fault detect

Most of the faults in the inspection construction site are caused by improper use and installation methods of pressure sensors, which can be summarized in several aspects.

1. The primary components (orifice plate, remote measuring connector, etc.) are blocked or installed in the wrong way, and the pressure point is unreasonable.

2. The pressure-inducing pipe leaks or is blocked, there is residual gas in the liquid-filled pipe or liquid in the gas-filled pipe, and there are deposits in the process flange of the transmitter, forming a dead zone for measurement.

3. The wiring of the transmitter is incorrect, the power supply voltage is too high or too low, and the connection between the indicator head and the instrument terminal is in poor contact.

4. The installation was not strictly in accordance with the technical requirements, and the installation method and site environment did not meet the technical requirements.

5. It is also very important to process the selected materials. Different processes will produce different strain values, and the key lies in the stability of the bridge value or the change of the process law after some aging adjustment.

6. There are many ways to adjust the drift, which are mostly determined by the conditions or production requirements of manufacturers. Most manufacturers control the zero drift very well. Temperature adjustment can be compensated by internal temperature resistance and heating zero sensitivity resistance, aging and so on.

For the transformer with circuit conversion, the drift of the circuit part can be compensated by selecting good components and designing more suitable circuits.

The strain material should be a material with high sensitivity and small temperature change.

What other ways are there to reduce and correct the electric drift? Apart from affecting the measurement accuracy and reducing the sensitivity of pressure sensors, what other important effects do zero-point electric drift have?

The thermal zero drift of pressure sensor can be eliminated by using zero-point electric drift. The so-called zero-point drift refers to the phenomenon that there is irregular and slow-changing voltage at the input of the amplifier when it is short-circuited. The main reasons for zero drift are the influence of temperature change on transistor parameters and the fluctuation of power supply voltage. In most amplifiers, the zero drift of the previous stage has the greatest influence, and the more stages and amplification factors, the more serious the zero drift is.

The magnitude of drift mainly depends on the selection of strain materials, and the structure or composition of materials determines its stability or heat sensitivity.