Installation Specifications and Maintenance Guide for Chemical Vacuum Gauges

The installation of the chemical vacuum gauge under negative pressure of -60kPa must strictly follow standardized procedures: First, ensure that the internal diameter of the pipe matches the interface size of the vacuum gauge (such as M20×1.5 threaded interface). Vacuum grease should be applied to the connecting flange, and a double-layer sealing ring should be used to ensure there are no leaks; the installation location should be away from the exhaust port of the vacuum pump and heat sources (such as heating furnaces) to avoid flow disturbances or thermal radiation that could cause sensor drift. If it is impossible to avoid high-temperature environments, insulation sleeves should be added or high-temperature models should be selected. For daily maintenance, it is recommended to check the sensitivity of the sensor every quarter by comparing it with a standard pressure source (such as -60kPa calibration weights); if a deviation of more than ±0.5%FS is found, the sensor should be disassembled and cleaned with a lint-free cloth to remove surface oil, avoiding the use of organic solvents. In the case of common faults, if pressure fluctuations or data jumps occur, the first step is to check if the connecting pipes have any micro-leaks (which can be detected using a helium mass spectrometer); if the sensor response is slow, it may be due to saturation of the internal adsorption layer, which requires returning to the factory for high-temperature degassing treatment. Additionally, the device supports communication with PLC or DCS systems, transmitting data in real time via the Modbus protocol for centralized monitoring and fault warning.