Currently, the pressure gauges commonly used in field operations typically include the following types: ordinary pressure gauges; stainless steel pressure gauges; shock-resistant pressure gauges; diaphragm pressure gauges; diaphragm shock-resistant pressure gauges; electrical contact pressure gauges; shock-resistant electrical contact pressure gauges; diaphragm pressure gauges; membrane pressure gauges; resistance remote transmission pressure gauges; differential pressure gauges; precision digital pressure gauges, etc.
Pressure gauges are widely used in chemical, petroleum, metallurgical, mining, and power industries. They are the most commonly used measuring instruments for displaying and controlling pressure, and like human eyes, they play a vital role in the production process of enterprises.
When selecting pressure instruments, we often fall into this misconception: Choosing ordinary pressure gauges without considering the medium. Ordinary pressure gauges use copper Bourdon tubes, which significantly shorten their lifespan when used with corrosive media. A chemical company once sent 15 pressure gauges; after inspection, repair, and calibration, only 3 were found to be合格 (qualified/compliant). The rest were rendered unusable due to corrosion or damage to the Bourdon tubes. After switching to stainless steel pressure gauges, the problem of pressure gauges failing due to corrosion was eliminated.
In applications where pressure fluctuates frequently, large-range pressure gauges are often chosen to prevent damage. However, this approach is ineffective. The pressure gauge's operation relies on the deformation of the Bourdon tube, which meshes with a sector gear and a cylindrical gear, causing the pointer to rotate via a hydraulic coil. If the pointer rotates frequently at a certain angle, the gears at that angle will wear down, leading to damage to the mechanism. At a certain liquefied petroleum gas company, pressure gauge failures were consistently attributed to gear wear; replacing them with shock-resistant pressure gauges significantly improved performance.
In addition, the selection of the pressure gauge range is crucial to ensure the reliable operation of the elastic element within the safe range of elastic deformation. The range selection must consider not only the magnitude of the measured pressure but also the rate of pressure change, with sufficient margin allowed. When measuring stable pressure, the maximum working pressure should not exceed 2/3 of the range; when measuring pulsating pressure, the maximum working pressure should not exceed 1/2 of the range; and when measuring high pressure, the maximum working pressure should not exceed 3/5 of the range. To ensure measurement accuracy, the minimum working pressure to be measured should not be lower than 1/3 of the range, which is the range within the red line on the dial.
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