Pressure calibrator calibration pressure gauge common 5 points of failure and maintenance methods Pressure gauge according to the device and the measurement of medium divergences There are several models and classifications, the most commonly used is the brass core spring tube pressure gauge, in addition to stainless steel pressure gauge , Seismic pressure gauge (internal oil-filled as damping), diaphragm pressure gauge (micro-pressure measurement, true air-to-air measurement), and some pressure surfaces are supplemented with auxiliary equipment such as diaphragm (diaphragm pressure gauge is used for easy erosion media measurement) These pressure gauges need to be calibrated with a step-by-step digital pressure gauge regardless of the construction method. If there is a problem, it may be necessary to know the accuracy and operation of black and white. This requires a pressure gauge calibrator.
Pressure gauge calibrator calibration pressure gauge often see problems can be roughly divided into several categories:
1, weakened elastic spring may be damaged.
This is also the first place in the place where pressure fluctuates frequently. Longevity's hairspring stretches and contracts to make it weaker. If the pressure line on the north side of the pressure process pressure or pressure gauge pressure tube freezing, condensate caused by precision digital pressure gauge pointer overturned to damage the spring, this can also be changed for repair.
2, deformation of the spring tube The deformation here refers to the elastic deformation, this problem is often presented on the current pressure gauge. Early pressure gauges have a thick spring tube regardless of the wall thickness and the tube diameter. Therefore, the spring tube is subject to impact and the elastic inertia is small. That is, Hooke's law is limited to a long life. Therefore, a long time is required to use spring tube pressure—displacement. No change in the relationship (small changes). The pressure tube manufacturers currently use the spring tube wall and tube diameter are very subtle, the long-term use of pressure resistance and elasticity deteriorated, shortened life expectancy, the first indication is that the Hooke's law of the spring tube is smaller, it does not The linear region becomes larger from time to time, so that the pressure-displacement linear relationship becomes less constrained, and thus presents a situation where the linear spring tube of the pressure gauge is directly deformed and distorted, and even the formation of the medium leakage exposes the present risk. The spring tube that shows a non-linear transition can only be disposed of.
3, the pressure gauge pointer does not return to zero This is the first use of a certain period of time after the spring tube pressure gauge tube shows elastic inertia, the formation of the initial displacement of the spring tube to send the change, that is, the elasticity of the long effort to make it flexible and inflated, you can understand Zero drift. To eliminate this problem, the mortal method is to set the needle. The fixed needle is to set the current position as a zero point when the precision digital pressure gauge is not pressurized and the pressure gauge is turned on and fixed from the new position to the zero position. Zero adjustment. The variability of the pressure gauge after calibrating through the fixed needle is suitable for the original requirements. For example, the return error, linearity, accuracy, and tapping displacement all pass the test. If it is not intended, it can be further sorted according to the actual situation. .
4, the middle gear part of the serious wear and tear of this problem is often presented in the pump outlet pressure shake large place, in practice in the pressure due to the valve opening is large, there is no design buffer tank may not be delusional, resulting in frequent pressure gauge pointer in a Pressure limitations within the shake, for example, the pressure of the plunger pump at the exit of its long time in a pressure limit frequently shaken, inducing fan gear and the middle gear part frequently meshing change, friction increased caused some gear damage. As a result, the pressure gauge deck may not only indicate that the scene is not backed off, but that the intermediate gears and sector gears can only be changed if the problem is eliminated, and the lower fixed base plate may be changed while operating.
5, the firmware is loose.
After the pointer is not returned to zero, the calibration does not envisage the reason why the fastener is loosened, and the adjustment bolt of the tie rod and the sector gear is loose, and the original status change triggers the expansion of the displacement of the fistula. The change will cause the pressure gauge pointer to become bigger or smaller. After adjusting the position of the adjusting screw under the standard pressure, it can be restored to the precise expansion of the pressure gauge. In addition, it is necessary to reflect on whether the fastening screw of the digital pressure watch core can be loosened, and whether the spring tube and the tie rod can fix the pin to break.
In summary, the five points are found and repaired during the pressure gauge calibration process in the pressure calibration instrument. The calibration pressure gauge is also the maintenance process. For those who have no qualifications, calibration is not allowed. For the original records used to calibrate the record form and the pressure gauge verification certificate, the accuracy of passing the pressure gauge is passed. In addition, during the calibration and maintenance process, task tickets must be filled in, and the retired pressure gauges must be filled in with scrapped orders and circulation orders, and the accounts should be matched in sequence.
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