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Precautions for the installation of diaphragm pressure gauges

Author:    Source:    Date: 2021-05-25 11:02:54
1. The position of the pressure tap should

(1) Avoid areas where the pipeline is bent, bifurcated, and vortexes are formed

(2) When there are protrusions (such as temperature measuring elements) in the pipeline, the pressure tap should be in front of it

(3) When it is necessary to take pressure near the regulating valve, if the pressure taking port is in front of it, the distance between the pressure taking port and the valve should not be less than 2 times the pipe diameter; if the pressure measuring port is at the back, the distance between the pressure taking port and the valve should not be less than 2 times the pipe diameter; The distance should not be less than 3 times the pipe diameter (4) For wide vessels, the pressure tap should be located in an area where the fluid flow is stable and there is no vortex. In short, the position of the pressure tap determined in the process flow should be able to measure the selected process parameters

 2. Laying of connecting pipes

The horizontal section of the connecting pipe should have a certain slope to facilitate the discharge of condensate or gas. When the measured medium is gas, the pipeline should be inclined to the pressure measuring port; when the measured medium is liquid, the pipeline should be inclined towards the pressure measuring instrument; when the measured parameter is a small pressure difference value, the inclination can be slightly Bigger. In addition, if the pipe is at the upper and lower corners, install a condensate discharge device at the low point of the nozzle or an exhaust device at the high point of the nozzle according to the medium in the pipe to ensure that the condensed liquid or gas in the pipe accumulates for a long time without affecting the measurement accuracy. . Condensate or gas should be discharged regularly

 2. Notes on installation of anti-vibration diaphragm pressure gauge and special instructions for additional devices
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 (1) In order to ensure that the shock-resistant diaphragm pressure gauge is not affected by the corrosion of the measured medium, and the viscosity and crystallinity are too high, an isolation device should be installed (2) In order to ensure that the shock-resistant diaphragm pressure gauge is not affected by the rapid change or pulsation of the measured medium The impact of pressure, a buffer is installed. Especially in the case of pressure fluctuations and pressure drops, it is easy to cause damage and scrapping of the vibrating diaphragm pressure gauge, or even cracking and leakage of the spring tube. (3) To ensure that the anti-vibration diaphragm pressure gauge is not affected by vibration, the pressure gauge should be equipped with Vibration damping device and fixing device (4) In order to ensure that the shock-resistant diaphragm pressure gauge is not affected by the high temperature of the measured medium, a liquid-filled bending device should be installed (5) It is strictly forbidden to use the special instrument for other purposes, and it is strictly forbidden to use the special instrument for other purposes. Measure on the device. Strictly prohibit the use of ordinary pressure gauges to measure the pressure of special media (6) For newly purchased anti-vibration diaphragm pressure gauges, metrological verification must be carried out before installation and use to prevent vibration, damage or other influences on the anti-vibration diaphragm pressure gauge during transportation. The factor of accuracy.

Guanghua Rd, Qingyang Dist, Chengdu, Sichuan Province, China 备案号:蜀ICP备13021392号-1