How to detect pressure gauges, tell you

It was based on the elastic element of sensitive components, measuring and instructions above environmental pressure instrument. The application of pressure gauge is very common, it almost throughout all of the industrial process and research fields. In the heat pipe network, oil and gas transmission, water supply, gas supply system, vehicle maintenance factory store. 。 。 Application, pressure gauge can be seen everywhere. Today to introduce you to several pressure gauge testing steps: a, 1, new appearance inspection system pressure gauge surface should be smooth and even, no rust. Burr, electroless plating, welding should be smooth and beautiful. Part 2, reading, pressure gauges should be colorless transparent glass or plastic cover, should not stop reading. Dial should level off, the logo clear bright and clean. 3, zero, with a limit pin gauge, in the absence of pressure pointer should be close to the stop pin, infinite check pin gauge, in the absence of pressure pointer should be within the zero mark. 4, pressure gauge if liquid, the liquid should be clear and transparent, without impurities or debris, the liquid level height should be located in the heart of the case above 0. 25 d - 0. 3 d ( D for meter diameter) And in 60 degrees thermostatic box no leakage phenomenon. Two, and hysterisis error and tapping of error of displacement of calibration and verification method of error, 1 in value of the pressure gauge verification, according to the numbered dividing line gradually step up smoothly when verification ( Or step-down) When reach the detection limit value, then cut off pressure source, pressure 3 min, and then press the original fixed-point smooth step-down, Or booster) Check back in reverse chronological order. 2, hysterisis error, on the same point check regularly in the booster ( Or step-down) And buck ( Or booster) Verification, the provisions of the permissible error absolute value. 3, tapping the displacement of each point check regularly, the booster ( Or step-down) And buck ( Or booster) After verification, tapping watchcase cause changes in the value quantity is not more than half of the permissible error absolute value. 4, the error value, for each inspection point in the booster ( Or step-down) And buck ( Or booster) Before, after verification, tapping watchcase with standard value for the difference between the value should comply with the requirements.