Nearly seismic pressure gauge is a mechanical pointer pressure gauge with a filled liquid in the case, or a mechanical pointer (or rotary dial) pressure gauge with a filled liquid and a damping device in the case, consisting of a pressure guiding system (including joints, spring tubes, limiting screws, etc.), gear transmission mechanism, display device (pointer and dial) and housing (including case, cover, glass, etc.).
The ambient temperature for instrument use is -40~70℃, and the relative humidity should not exceed 80%. If it deviates from the normal use temperature by 20±5℃, the temperature additional error should be included.
The instrument must be installed vertically, and efforts should be made to maintain the same level as the measurement point. If the difference is too high, the additional error caused by the liquid column should be included, but this does not need to be considered when measuring gas. Block the explosion-proof port at the back of the case during installation to avoid affecting explosion-proof performance.
The normal measuring range of the instrument should not exceed 3/4 of the measurement upper limit under static pressure and should not exceed 2/3 of the measurement upper limit under fluctuations. Under the above two pressure situations, the minimum measurement of the pressure gauge should not be lower than 1/3 of the lower limit, and the vacuum part should be fully used when measuring vacuum.
If the instrument pointer malfunctions or the internal components loosen or fail to function properly during use, it should be repaired or contact the manufacturer for maintenance.
The instrument should avoid vibration and impact to avoid damage.
When placing an order, please specify: instrument model and name, instrument measuring range, instrument accuracy level deviating from the packaging requirements, and others.
Special design should be carried out according to user's requirements.
Before installation, check whether the instrument model, specifications, and accuracy level meet the instrument usage requirements. Check whether the joint thread of the instrument and the installed female screw are consistent.
The pressure gauge should be installed vertically, and the inclination angle should generally not exceed 30°, and efforts should be made to maintain the same level as the measuring point to avoid indicating errors.
After installation, observe whether the pointer is at the zero position or close to the disc stopper without pressure. otherwise, it should not be used.
When measuring steam pressure, the lower end of the pressure gauge should be equipped with a ring-shaped tube. Water is used to transmit steam pressure during use to avoid high-temperature steam rushing into the spring tube, affecting the accuracy of the instrument, or accidentally causing solder to melt, causing the instrument to leak and causing accidents or burns.
When in use, slowly open the valve to slowly rise to the working position. If the valve is suddenly fully opened and the pressure is out of control, exceeding the measurement upper limit, the spring tube may be damaged or deformed, or the fan gear may jump teeth, causing the instrument to lose its functionality.
After use, release the pressure slowly, and do not let the pointer drop suddenly to the zero position. This will cause the pointer to hit the disc stopper, which will bend or even break the pointer.