The quality appraisal of stainless steel pressure gauge affects its performance.

Stainless steel pressure gauges are mainly used for pressure detection in metallurgical, electric power, petroleum, chemical, light industry, machinery and other industrial sectors. Stainless steel pressure gauges rely on internal filling with damping oil and supporting buffer devices. It has good seismic resistance.

It is suitable for occasions where the pressure of the measured medium has strong pulse change or pressure impact, and it is often suddenly unloaded in the production process, as well as places with large environmental vibration. The instrument can measure the average value of pulsating pressure of gas and liquid. In order to overcome the damage of medium strong pulse and environmental vibration to the instrument and ensure the accuracy of reading.

In order to make the service life of stainless steel pressure gauge long, it is necessary to check the indication error, return error and tapping displacement. Let's take a look at it together:

In the method of indication error verification, the indication verification of stainless steel pressure gauge is carried out according to the graduation line marked with numbers, and the pressure is gradually and steadily increased (or decreased) during verification. When the indication reaches the detection upper limit, the pressure source is cut off, and the pressure is kept for 3 minutes, and then the pressure is steadily decreased (or increased) in reverse order according to the original verification point.

Return error refers to the allowable error value specified in the verification of boosting (or depressurizing) and depressurizing (or boosting) for the same point inspection.

Tap the displacement lightly. When checking each point, during the step-up (or step-down) and step-down (or step-up) checking, the indicated value change caused by the light case is not more than 1/2 of the allowable error value specified in Table 1.

Indication error: For each verification point, when boosting (or depressurizing) and depressurizing (or boosting) verification, the difference between the front and rear indications of the lightweight case and the indication of the standard should meet the requirements.

Several points needing attention in the use of explosion-proof electric contact pressure gauge

Explosion-proof electric contact pressure gauge is used in dangerous places with explosive mixture in the environment to measure the pressure (negative pressure) of non-crystalline and non-solidified media which are not corrosive to copper, copper alloy and ordinary carbon steel. Through the contact device, it is matched with electrical parts with corresponding explosion-proof performance. It has many functions such as automatic control and alarm for the measured medium pressure.

1. Generally, the instrument pressure part uses 3/4 of the upper pressure limit.

2. When adjusting the instrument to give an order (adjust the upper and lower limit pointers to a given value by adjusting the knob), the off-line given value should be adjusted first and then the on-line given value should be adjusted.

3, open the outlet box or adjust the given value range after cutting off the power supply.

4. Under normal use, the instrument shall be inspected regularly, and the indication check shall be carried out at least once a year. In case of sudden accidents (such as pressure relief caused by leakage and rupture of the spring tube, contact welding or contact reliability affected by serious oxidation, pointer falling off, loosening or instruction distortion, etc.), the instrument shall be inspected immediately.

5, the instrument in the process of use, should always keep dry and clean.

6. Whether the flameproof performance of the instrument is reliable or not mainly depends on the pressure borne by all the components that make up the flameproof enclosure (that is, the pressure generated by the explosive mixture in the enclosure during explosion and the quality of each flameproof surface and mating surface). Therefore, in the process of installation, maintenance and inspection, care must be taken to avoid rubbing or hammering, especially when disassembling the outlet box of the instrument or carrying out a comprehensive overhaul, and painting is not allowed on the explosion-proof surface (only a thin layer of anti-rust grease, such as 204-1 anti-rust oil, is allowed).

7. When overhauling the instrument, if the user is unclear about the basic knowledge of flameproof electrical equipment and does not know much about the structural characteristics and requirements of flameproof instruments, do not arbitrarily piece together or modify them, otherwise the flameproof performance of the instrument will be damaged. If necessary, the instrument can be sent to our factory for overhaul.

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