Question: How to choose a good pressure gauge movement?

Answer: The pressure gauge movement is very common in our industrial production. But we need to keep our eyes open when choosing a pressure gauge movement. After all, in this mixed market, if there are good quality pressure gauge movements, there will be poor quality pressure gauge movements.

The pressure gauge movement is composed of a central gear, a sector gear, a hairspring, an indication adjustment screw and a connecting rod. According to the structural characteristics of the automatic assembly line of mechanical parts and the assembly process characteristics, the mechanical structure characteristics of the pressure gauge movement components are analyzed. Then we can judge the quality of the movement.

The pressure gauge movement needs to change the linear displacement of the free end of the bourdon tube into an angular displacement to enlarge the small displacement of the bourdon tube, so that the pointer can obtain a larger rotation angle proportional to the measured pressure to ensure that the pressure gauge has sufficient reading accuracy.  So it can achieve the purpose of easily observing the indicated value.

The main parameters of the movement include: modulus, transmission ratio, hair spring torque, applicable pressure range. The pressure gauge movement is the main work object in the pressure gauge maintenance. It is the source of the pressure gauge failure and error. The maintenance personnel should have a full understanding of this to successfully complete the work tasks in the maintenance.

The core material is generally copper, and the outer shell is made of copper or stainless steel. Copper, like iron, will rust over time which is green patina. So stainless steel is better.

When selecting the working range, according to the versatility of the load condition, it is appropriate to select 1/3 to 2/3 of the full range, because this working range has high accuracy and can be used under both steady and fluctuating loads. The maximum working range shall not exceed 3/4 of the full scale of the dial.

Now we know how to choose a good pressure gauge movement. In fact, it is not difficult to choose a good pressure gauge movement. As long as we can achieve the above points, I believe everyone can choose a suitable pressure gauge movement.