What is the calibration procedure of refrigerant pressure gauge

During the pressure gauge calibration process, technicians must fully prepare the required tools and equipment to ensure the smooth progress of the calibration work. The core tool for calibrating a pressure gauge is a standard pressure source, which can be a high-precision pressure calibrator or a certified standard pressure gauge. In addition, auxiliary tools such as wrenches, sealing tapes and cleaning cloths are also indispensable. Ensuring that all tools and equipment are in good condition is the basis for accurate calibration.

After the preparation work is completed, the technician should conduct a visual inspection of the pressure gauge to be calibrated to confirm that it has no obvious signs of damage or corrosion. If the pressure gauge is found to be damaged, it must be repaired or replaced as a priority to ensure that it works properly. Subsequently, the technician needs to carefully disassemble the pressure gauge, especially in the refrigeration system, and avoid refrigerant leakage during disassembly. When using tools such as wrenches, the pressure gauge should be rotated gently to avoid damage to the equipment due to excessive force.

After disassembly, the technician connects the pressure gauge to the standard pressure source. During the connection process, it is important to ensure a good seal to prevent gas leakage. Poor sealing will not only cause distortion of the measurement data, but may also pose a safety hazard to the operator. To ensure the tightness of the connection, the technician can wrap the connection with sealing tape. After the connection is complete, the settings of the standard pressure source should be checked to ensure that it can provide the required pressure range and the initial reading of the standard pressure source should be recorded.

Next, the technician should gradually increase the pressure of the standard pressure source, usually starting from zero and gradually increasing to the full scale of the pressure gauge. At each set pressure point, the technician should wait for a few seconds to ensure that the pressure gauge pointer is stable before taking a reading. At this time, the pressure gauge reading at each set pressure point should be recorded and compared with the reading of the standard pressure source. In this way, the technician can identify the measurement error of the pressure gauge at different pressure points.

After completing the readings at multiple pressure points, the technician should compare the recorded data and analyze the accuracy of the pressure gauge. If the readings at some pressure points are found to be deviated greatly, the technician needs to make corresponding adjustments. Many pressure gauges are equipped with adjustment screws or adjustment devices, which the technician can fine-tune as needed to make the pressure gauge reading consistent with the reading of the standard pressure source. During the adjustment process, the readings need to be recorded repeatedly until the pressure gauge reading matches the reading of the standard pressure source.

After completing the adjustment, the technician needs to test the full range of the pressure gauge again. This process is designed to ensure that the pressure gauge maintains accurate readings throughout its entire operating range. By gradually increasing and decreasing the pressure and observing the pressure gauge's response, you can confirm its stability and accuracy under different pressure conditions. If problems are still found during the full-scale test, you may need to consider replacing the pressure gauge or performing more in-depth repairs.