Precautions for the Installation and Maintenance of Pressure Gauges

Pressure gauge is an important tool for measuring and monitoring the pressure of liquids and gases. It plays a critical role in numerous industrial and mechanical devices. Proper pressure gauge installation and maintenance are key steps to ensure the performance, accuracy, and safety of the measurement system. Adhering to the correct installation and maintenance procedures can significantly improve the performance and lifespan of pressure gauges and help prevent potential safety issues.

Precautions for Pressure Gauges Installation and Use:

1. Before installation, check whether the model, specifications, and accuracy level of the instrument meet the requirements for instrument use. Check if the connector thread of the instrument is consistent with the internal thread of the installation.
2. The pressure gauge should be installed vertically, with a tilt angle generally not exceeding 30°, and strive to maintain the same level as the measurement point to avoid indication errors.
3. After installation, in the absence of pressure, observe whether the pointer is at zero or close to the stop pin. If not, it should not be used.
4. When measuring steam pressure, the lower end of the pressure gauge should be equipped with an annular tube. During use, water is used to transfer steam pressure to prevent high-temperature steam from entering the spring tube, affecting the accuracy of the instrument, or accidentally melting the solder and causing instrument leakage, accidents, or burns.
5. When using, slowly open the valve to gradually increase the pressure to the working position. If the valve is suddenly opened and the pressure is out of control, exceeding the upper limit of measurement, it will cause the spring tube to be damaged, deformed, or the fan teeth to fall off, resulting in the instrument losing its functionality.
6. After use, the pressure should be slowly released, and the pointer should not be abruptly lowered to zero to prevent the pointer from hitting the stop pin and bending or breaking.
7. The removed instrument should be stored in a dust-free, dry, and non-corrosive environment.

Precautions for Pressure Gauge Maintenance:

1. The pressure gauge should be kept clean, and the glass on the dial should be bright and clear, allowing the pressure value indicated by the pointer on the dial to be clearly visible. Pressure gauges with broken glass or blurred dial scale should be discarded.
2. The connecting pipe of the pressure gauge should be blown regularly to prevent blockage, especially when used for gas with a lot of oil dirt or other viscous substances.
3. You should often check whether the rotation and fluctuation of the pressure gauge pointer are normal, and whether the cock on the connecting pipe is in the fully open position.
4. Pressure gauges must be calibrated regularly, and the frequency can be determined based on specific conditions:
   • After three months of operation, a level 1 maintenance must be performed on the pressure gauge. This mainly involves checking if the pressure gauge can return to zero, and if there are any leaks in the three-way cock and water trap joint. The water trap must be checked and flushed to ensure smooth water flow.
   • After one year of operation, a level 2 maintenance must be applied. At this time, the pressure gauge can be disassembled and sent to the measurement department for verification and lead sealing. When disassembling and checking the trap, ensure that the threaded fasteners are intact. Disassemble and check the three-way cock, grind the sealing surface to ensure that it is tightly fastened without leakage, and the connection thread is intact. Store the trap, remove the rust and paint the three-way cock.
5. When the pressure gauge is inaccurate during operation, it must be replaced in a timely manner. Before replacing the instrument, the three-way valve must be turned to the position for flushing the pressure gauge, and the dirt inside the trap pipe must be flushed.

The above are the precautions for the installation and maintenance of pressure gauges. If you have any unresolved issues during the installation and maintenance process, please feel free to contact us, and we will do our best to help you solve these problems.