Damage to high-temperature melt pressure sensors is usually caused by improper installation. Forcing the sensor into a hole that is too small or irregularly shaped can damage the sensor's diaphragm due to impact. Using appropriate tools to machine the mounting hole helps control its size. Furthermore, proper installation torque helps create a good seal; however, excessive torque can cause the high-temperature melt pressure sensor to slip. To prevent this, an anti-slip compound is usually applied to the threaded portion of the sensor before installation.
Correct Installation Method for Pressure Sensors:
Verify the frequency response value of the pressure sensor under normal atmospheric pressure and standard temperature conditions using appropriate instruments.
Verify the correctness of the pressure sensor's coding and corresponding frequency response signal.
Determine the Specific Installation Location
To determine the pressure sensor's number and specific installation location, consider each inflation section of the inflation network.
Pressure sensors must be installed along the cable, preferably at cable joints.
Each cable should have at least four pressure sensors installed. The two pressure sensors closest to the telephone exchange should not be more than 200 meters apart.
One pressure sensor should be installed at each end of each cable.
One pressure sensor should be installed at each cable branch point. If two branch points are close together (less than 100 m), only one pressure sensor is needed.
One pressure sensor should be installed at the point where the cable laying method changes (overhead, underground).
For cables without branches, since the cable type is consistent, the installation interval of pressure sensors should not exceed 500 m, and the total number should not be less than four.
To facilitate the identification of pressure sensor failure points, in addition to installing a pressure sensor at the starting point, another pressure sensor should be installed 150-200 m away from the starting point. Of course, economic and technical factors must be considered in the design; pressure sensors should not be installed where they are not needed.
Check Dimensions: If the mounting hole size is not appropriate, the threaded part of the high-temperature melt pressure sensor will easily wear during installation. This will not only affect the sealing performance of the equipment but also prevent the sensor from functioning properly and may even create safety hazards. Only proper mounting holes can prevent thread wear (thread industry standard 1/2-20UNF2B). Mounting holes can usually be inspected using a mounting hole measuring instrument to make appropriate adjustments.