Commissioning of the pressure gauge

Install the pressure gauge on the pressure calibrator, and connect the variable resistor attached to the ohm meter to the ohm file of the ohm meter or multimeter. Then, the pressure indication value of the pressure gauge shall be verified in the forward direction (boost) and reverse direction (depressurization) respectively, and the indication error shall meet the requirements of the verification regulations. While verifying the pressure indication, observe the change of the variable resistance value on the ohm meter of the ohmmeter or multimeter. Observe that the resistance value can be read at the same time when it is observed (this is basically the same as the principle of reading the indication error of the pressure gauge signal of the charged contact signal device in JJG52-1999). The change in resistance is the same as the change in pressure indication, it should be linear, and pay attention to its continuity. At the upper and lower limits of the pressure indication, it should be noted whether the variable resistor is within the effective working range, otherwise it needs to be adjusted by changing the contact sheet and other methods.
Check whether the conductive performance between the moving contact of the variable resistor and the winding resistance is good, because it has a direct correlation with the function of the connected line. First check the contact pressure between the moving contact piece and the winding resistance. It should not be too small, that is, the two should not be too loose. If the contact is too loose, it should be adjusted by changing the shape of the moving contact piece. Then check the contact pressure between the moving contact piece and the winding resistance. It should not be too large, that is, the two should not be too tight. If the contact is too tight, the electric contact layer of the moving contact piece can be cleaned with cotton fiber dipped in alcohol. In addition, increasing the contact pressure can also reduce the contact resistance.
The geometry and raw material performance of the moving contact of the variable resistor attached to the fan-shaped wheel of the remote transmission pressure gauge should meet the requirements for easy adjustment. Otherwise, on the one hand, it will affect the conductivity between it and the winding resistance; on the other hand, it is easy to make the moving contact slide out of the effective working range of the winding resistance, thereby causing the disconnection of the line connected to the variable resistor.

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