What is the reason why the pointer goes behind the disc stop nail?
Under normal circumstances, when the pressure gauge is placed vertically, the front end of the pressure gauge pointer should be above the disc stop nail. Sometimes the front end of the pointer appears abnormally below the disc stop nail. We call it "the pointer runs to the disc stop nail." Behind".
There are two situations when the pointer runs behind the plate stop nail of the thermal resistance: one situation is before the meter is used, take out the meter from the packing box and have a look, the pointer of the stainless steel pressure gauge is behind the plate stop nail, and the other situation is the instrument After using it for a period of time, when I stopped the machine, I found that the pointer ran behind the disc stop nail.
1. The cause of the former is generally that the stainless steel pressure gauge has a high nail needle or a slightly lower plate stop during instrument adjustment. When the instrument is transported or transported, if the vibration is a little too large, the pointer may be shocked to the plate stop. Behind.
2. The latter is divided into two situations: the first is that the pressure of the instrument is relieved too fast or too quickly, and there is a certain vibration at the work site, and the pointer hits the disc stop nail and is bounced behind the disc stop nail; the second is pressure The meter is broken, and the overpressure gauge is more than 3 times larger than the two parts of the meter. The thermal resistance pointer is blocked by the disc stop nail. After the pressure is relieved, the sector teeth are jammed, and the pointer is displayed behind the disc stop nail; The third is that the screws on the movement are loose or fall off. It is also possible that the pointer runs behind the disc stop nail.
