What is the reason for the displacement of the opening of the stainless steel pressure gauge?
In the verification process of stainless steel pressure gauge, there is a necessary inspection index, called tap displacement. Tap displacement refers to the pointer displacement caused by tapping the case at the same check point. The change in the two indicated values before and after shell tapping is the number of tapping displacements.
The purpose of checking tap displacement is to see if the pointer jumps or shifts, and to see if each part fits well.
To "tap" means to tap the side wall of the case with your fingers. Not suitable for hitting from the back of the case or with a hammer. The tap displacement number is not divided into "±", and the result is * value.
Reasons for the displacement of the stainless steel pressure gauge opening:
The pointer in the normal state, after tapping the shell, should swing counterclockwise first, otherwise there needs to be a tapping displacement. Tap displacement is in many cases caused by friction between parts, with the exception of hairsprings. Parts are installed loose due to poor assembly, especially if the parts are installed too tightly. Tap displacement is usually caused by:
The hairspring is not tight enough or wide enough, or the ends of the hairspring are not tightened properly.
The friction of the gearbox parts will affect the resistance of the free end of the spring tube to the gearbox amplifying mechanism and pointer assembly. Commonly, the connecting rod is not flexible; the drive shaft is crushed; or the shaft is too tight to the hole. The screw is loose somewhere, especially the adjustment screw, which has a great impact; the teeth are not meshed well, the teeth are loose or blocked; the pointer is not fastened, the pointer sleeve and the pointer piece are loose, etc.
The precautions for using stainless steel pressure gauges are as follows:
1. The electrical contact of the pressure gauge is large, and the current passing through the pressure gauge is not allowed to exceed 3A (Ampere), otherwise the pressure gauge is responsible.
2. The pressure gauge should be installed vertically, and collision and vibration should be avoided during handling and installation.
3. The pressure gauge should be used in a place where the ambient temperature is -40℃～+70℃, the relative humidity is not more than 85%, and the vibration or rapid pulsation of the measured medium does not affect the reliable contact and accurate signal reading.
4. The circuit of the pressure gauge (see schematic diagram) should be carefully checked after setting and connection, and a trial operation should be carried out.
5. When adjusting the given value of the pressure gauge, it is necessary to use a slotted screwdriver.
6. When measuring static load, the pressure gauge can reach 3/4 of the upper limit of measurement; when measuring alternating load, the pressure gauge can reach 2/3 of the upper limit of measurement; when measuring instantaneously, the pressure gauge can reach the upper limit of measurement.
7. When measuring medium with high viscosity and severe pressure fluctuation, the pressure gauge should be equipped with isolation device and buffer device
Stainless steel pressure gauge humidity measurement technology has a long history. With the development of electronic technology, modern measurement technology has also developed rapidly. In principle, humidity measurement can be divided into 20 or 30 types. The representation methods of humidity include humidity, relative humidity, dew point, ratio of humidity to dry gas (weight or volume), etc. However, humidity measurement has always been one of the difficult problems in the world measurement field. A seemingly simple quantity involves rather complex theoretical analysis and calculation of physical chemistry. Beginners may overlook many factors that need attention in humidity measurement, which affect the rational use of humidity measurement.
Commonly used humidity measurement methods are: dynamic method (double pressure method, double temperature method, shunt method), static method (saturated salt method, sulfuric acid method), dew point method, dry and wet bulb method and various electronic sensor methods.
