Indication error Linearity error (1) The indication errors of the respective pressure values ​​are the same. This is caused by the misalignment of the pointer. Just remove the pointer and re-position it accurately under a certain pressure value. (2) The indication error is proportional to the pressure value. This type of error is mainly caused by a change in the gear ratio. This type of error can be eliminated by adjusting the position of the indication adjustment screw and changing the gear ratio. If the error of the meter is gradually increased with the increase of the pressure value, move the indication adjustment screw to the right (down) to enlarge the arm length of the short arm of the sector gear, that is, lower the transmission ratio. Otherwise, the adjustment direction is reversed and the gear ratio is increased.
Nonlinear error nonlinear error is also called curve error. The indication error does not increase or decrease proportionally with the increase and decrease of the load, but gradually changes from a positive value to a negative value, or from a negative value to a positive value. This type of error is generated because the angle of rotation of the pointer during full stroke is greater or less than the scale angle on the dial. This indication error can be changed by changing the angle between the connecting rod and the sector teeth. Rotate the movement clockwise in the positive and negative directions, or move the free end outward to enlarge the angle between the connecting rod and the sector teeth. Conversely, first rotate the movement in a counterclockwise direction, or move the free end inward to reduce the angle between the connecting rod and the sector teeth.
Irregularity error In addition to the above, sometimes the indication of the pressure gauge changes positively or negatively and irregularly. The reason is mostly that the parts are damaged or the spring tube is deformed, and only the parts or spring tubes can be replaced. In short, in the process of adjusting the value error of the spring tube pressure, it is necessary to analyze the specific situation, find the cause, and solve it in a targeted manner, and it will receive good results.
The calibration of the spring tube pressure gauge of the spring tube pressure gauge is the key to ensure the accuracy and reliability of the measured pressure value. The pressure gauge used in the production process must be qualified and the unqualified watch is strictly prohibited. The verification shall be carried out according to the spring tube type general pressure gauge, pressure gauge and vacuum gauge verification procedure (JJG52-1999) issued by the State Bureau of Quality and Technical Supervision (the verification process will not be repeated). This article only covers two specific issues in the verification process.
The allowable absolute error of the calculated pressure gauge that allows the basic error is the absolute value of the allowable basic error, which is calculated as follows: Allow absolute error = percentage of the accuracy level of the measurement range. For example: the ordinary pressure vacuum gauge with the accuracy grade of 1.5 and the measuring range of -0.10.6MPa, and the absolute error allowed absolute error = (01+06) 15% = 00105MPa.
Control principle and main technical characteristics of soft starter There are several kinds of soft starters on the market. Their principle is universal. They all improve the inherent starting characteristics of the motor, try to make the starting current small and the starting torque is large. The process was developed as smoothly as possible, with low equipment costs and low energy loss during start-up. The all-digital AC motor soft starter (also known as the intelligent motor controller) introduced in this paper adopts the digital, modular and multi-function solid state controller of American AB Company, and the range with the peripheral power meter should be the school. Check the range of 4/3 or 3/2.
Conclusion Spring tube pressure gauges are small in size and low in price, and are easily overlooked in industrial production. We should pay attention to our work, strictly control the selection, inspection and verification of each type of pressure gauge to ensure the safe and normal operation of the production process.
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