Stainless Steel Diaphragm Pressure Gauge And Liquid Pressure Gauge Manometer
The diaphragm pressure gauge is a system diaphragm gauge composed of a diaphragm isolator and a general purpose pressure instrument. Stainless steel diaphragm pressure gauge and equipment connection methods are mainly threaded connection and flange connection and sanitary clamp type. The meter is suitable for measuring the pressure of the medium with strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification, solid floating objects, and must avoid the measurement medium directly into the general pressure instrument and prevent sediment accumulation and easy cleaning.
Working Principle Diaphragm pressure gauge by diaphragm isolator and universal pressure gauge composed of a system diaphragm gauge, suitable for measuring strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification, solid floating media pressure, and must avoid the measurement medium directly into the universal pressure gauge and prevent sediment accumulation is easy occasions. Diaphragm pressure gauge is mainly used in petrochemical, alkali, chemical fiber, dyeing, pharmaceutical, food and dairy industry production process flow fluid medium pressure.
Diaphragm pressure gauge through the special equipment to pump the spring tube into a vacuum, and filled with the working liquid, with the diaphragm to seal the diaphragm, when the pressure P of the measured medium acts on the diaphragm, so that it deforms, the working liquid filled inside the system, so that the working liquid forms a P equivalent to the △P, with the help of work. The conduction of the liquid causes the free end of the elastic element (spring tube) in the pressure instrument to produce a corresponding elastic deformation-displacement, and then displays the measured pressure value according to the working principle of the pressure instrument. Temperature Characteristic Because the diaphragm pressure gauge system is filled with sealing liquid as the medium to transfer pressure, the temperature expansion coefficient of the sealing liquid makes the pressure instrument increase with the temperature of the pressure part, and the temperature influence is related to the expansion coefficient of the seal, the diaphragm stiffness and the pressure temperature, especially for the low range pressure instrument. Generally, the temperature error of the pressure part is not more than 0.1%/ degree, so the total temperature influence of the diaphragm pressure gauge is generally the sum of the temperature influence of the general instrument and the temperature influence of the diaphragm device.
Verify Before installing the diaphragm pressure gauge, the model, diaphragm material and measuring range must be carefully checked to check whether the diaphragm is bruised. When there is no pressure, the pressure instrument indicates whether it is in the zero position, and at the same time, find out the reason, re-adjust, and verify that it can be used. The steps for verifying diaphragm pressure gauges are the same as those for verifying conventional pressure gauges, and once again they are no longer repeated, mainly paying attention to the following points: 1、Before calibration, the diaphragm device model of the diaphragm pressure gauge to be calibrated is first prepared to match the joint, so as to be used in the universal pressure calibration table. The diaphragm device of the diaphragm pressure gauge is generally flanged, and the matching pressure joint can be prepared according to the size and model of the flange. The corresponding flange and the universal pressure gauge joint can be processed on site. This is also the most direct and convenient way.
2、In the process of fixing the calibrated diaphragm pressure gauge on the standard calibration table, pay attention to: Handle gently, do not hurt the diaphragm, when using a wrench to rotate the diaphragm pressure gauge, the wrench must be stuck on the connection nut of the diaphragm device, rather than stuck on the universal pressure gauge, because the universal pressure gauge on the instrument and the diaphragm device is a sealed system shall not be disassembled or replaced at will, so as to avoid the leakage of the working liquid filled inside the system. And affect the use of performance and even scrap.
3、In the process of pressure boost, compared with the standard table, if it is out of whack, first check whether there is oil leakage, sealing and other problems, such as oil leakage, bad sealing can only be returned to the factory for treatment or scrap; If it is not the above case, then you can remove the indicator needle and re-set the indicator needle. Long-term experience is that it is reasonable to re-set the needle at 1/2 of the range when setting the needle. If it is still out of order, it can only be degraded or scrapped.
