Piston pressure gauge as the basic measurement and calibration pressure equipment, because of its inexpensive, cost-effective, accurate measurement standard is the internationally accepted pressure reference equipment, and has received everyone's welcome. But there are two points to choose piston pressure gauges must pay attention to, this relates to product performance and quality.
First, the accuracy of the piston. There are many manufacturers of piston pressure gauges on the market, but there are not many people who really grasp their technical skills. There is no lack of some of them. The accuracy of the piston depends on its precise geometry and fit clearance. Small size, will inevitably fall faster, the pressure save time is short; large size piston stuck, accuracy lost. The straightness is good and the output is linear; the straightness is not good and the output pressure jumps. In addition, indicators that affect its accuracy include finish, ovality, assembly dimensions, and so on.
Jiangsu Hongrui Instrument Co., Ltd. produces piston pressure gauges. Piston rods and piston cylinders are hand-polished by experienced masters. And the piston type pressure gauges sold by Jiangsu Hongrui Instrument Co., Ltd. all passed the verification of the measurement department and issued a verification certificate.
Second, the system pressure sealing test. There are many manufacturers of piston pressure gauges on the market, and there are many style styles. And most measurement departments do not require the host to be inspected. Therefore, there are many assembly machines that mix the fish head and mix the market. This critical parameter is often ignored by the buyer.
As we all know, piston pressure gauges are equipment for hydrostatic sealing tests. The system does not maintain a good pressure seal, which will result in a series of problems such as shortened test time, unstable pressure, and inaccurate output. Take a 60MPa 0.05-stage piston pressure gauge, to give a simple example. Although the Pistons issued a report of <0.8mm, this report only refers to the drop of the Pistons. The overall piston seat seal is of concern to the user. Because the overall seal equals the sum of the bench seal and the piston seal test. According to the requirements of the national standard JJG59, if the stage body seal is greater than 2MPa for 5 minutes, the piston can still be judged as unqualified. However, in fact, this has not been implemented because of operational problems.
So choose a piston pressure gauge must be carefully asked the seller, the implementation of a clear, conditional field test can be the best.
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