This paper introduces the adjustment method of diaphragm pressure indication value.

Adjustment method of diaphragm pressure indication value

Diaphragm pressure gauge is a widely used pressure instrument in industry. In the verification process, the problem of indication out of tolerance is common. The specific adjustment methods are as follows:

Adjustment of diaphragm pressure indication value 1

The out-of-tolerance of each verification point of diaphragm pressure gauge is the same. After boosting, the pointer can be reinstalled at the first verification point except the zero point to calibrate the indication.

Adjustment of diaphragm pressure indication value 2

The difference of diaphragm pressure gauge is linear error. When the error increases gradually, move the indicating adjusting screw outward to increase the arm length; On the contrary, it moves inward to reduce the arm length.

Adjustment of diaphragm pressure indication value 3

The indication value of diaphragm pressure gauge is out of tolerance first (positive error) and then slow (negative error). Turn the movement counterclockwise to enlarge the included angle between the pull rod and the sector gear; Otherwise, turn the movement clockwise to reduce the included angle. After adjustment. The error is linear, and then move the indicating adjusting screw.

Adjustment of diaphragm pressure indication value 4

The indicated value of diaphragm pressure gauge is out of tolerance near half the pressure. After boosting, the pointer can be reinstalled in the middle position. If the error cannot be eliminated, the included angle between the pull rod and the sector gear should be adjusted for comprehensive adjustment.

Adjustment of diaphragm pressure indication value 5

Diaphragm pressure gauge has only one or two points out of tolerance. Check the cooperation of the movement near this point. If it is positive or negative, there is dirt and burr at the gear meshing position; When it is negative, the teeth are worn and injured and should be repaired or replaced.

Adjustment of the indicated value of diaphragm pressure 6 A pressure gauge has been adjusted several times, but the back-and-forth difference is still out of tolerance, and the pointer does not return to zero, so it may be that the spring tube is deformed and needs to be replaced again.

After the adjustment, assemble all parts of the instrument and re-verify it according to the verification regulations.

Reasons for Out-of-tolerance of Stainless Steel Seismic Gauge

Stainless steel shock-resistant meter is one of the instruments that sell well in the market. As for why it is so popular, it is nothing more than that the stainless steel shock-resistant meter is more in line with the purchasing needs of consumers. However, we should also pay attention to one thing. After all, the stainless steel earthquake-resistant meter is a measuring instrument, and there are many factors that can affect the measured data of this product. For example, if there is an out-of-tolerance of this instrument, it will have a great impact on it.

Due to the frequent work of the instrument, the movable clearance at the joint of the lower part is too large, such as the loose fit between the shaft and the hole, the excessive clearance between the shaft and the radial clearance, and the wear of the teeth and the loose fit, etc., which may cause the return error to be out of tolerance. This requires finding out where the fault exists and solving it symptomatically.

First, the dirt left in the spring tube is also one of the reasons for the poor return of the instrument.

Treatment method: inject gasoline into the spring tube with a medical injection needle tube and shake it until the accumulated dirt is cleaned.

Second, the deformation of the spring tube is one of the main reasons for the poor return of the instrument.

Treatment: If the instrument has a large back-and-forth difference, and it appears at the same time as the non-return low, it can be considered that the spring tube has been deformed. The deformation of the spring tube cannot be repaired, so the spring tube should be replaced or the instrument should be scrapped immediately.

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