The difference between precision digital pressure gauges and precision pressure gauges The difference between precision digital pressure gauges and precision pressure gauges is that they are always smart, one is digital display and the other is pointer display.
The difference between precision digital pressure gauge and precision pressure gauge
The difference between precision digital pressure gauges and precision pressure gauges The difference between precision digital pressure gauges and precision pressure gauges is that they are always intelligent, one is digital display and the other is pointer display. The precision level of precision digital pressure gauges is 0.1 grade 0.5 grade 0.4 grade 0.05 grade 0.25 grade. Precision gauges have an accuracy rating of only 0.4 and 0.25.
What is the accuracy level of the pressure gauge?
The accuracy level of the pressure gauge is expressed as the percentage of the allowable error in the range of the pressure gauge. It is generally divided into seven levels of 0.5, 1, 1.5, 2, 2.5, 3, and 4 (there are no grades 3 and 4 on the boiler). The smaller the value, the higher the accuracy. For example, for a pressure gauge with a gauge range of 0 to 2.5 MPa and an accuracy of 2.5, the allowable error between the pressure value indicated by the pointer and the actual pressure value of the measured medium shall not exceed 2.5 MPa × 2.5% = ± 0.062 5 MPa; When the pressure gauge indicates that the pressure is 0.8 MPa, the actual air pressure is between 0.737 5 and 0.862 5 MPa.
It can be seen that the actual error of the pressure gauge is not only related to the accuracy, but also related to the range of the pressure gauge.
When the ranges are the same, the higher the accuracy (ie, the smaller the number), the smaller the allowable error of the pressure gauge.
When the accuracy is the same, the larger the range, the larger the error of the pressure gauge.
Similarities between precision digital pressure gauges and precision pointer pressure gauges
The dials of some precision digital pressure gauges and precision pointer pressure gauges are discs, such as CJBP3000, CJBP2000 precision digital pressure gauge and precision pointer pressure gauge YB-150. The dial of the number is 100 mm in diameter and the dial of the pointer is 150 mm in diameter.
The difference between pointer and digital:
Pointer precision pressure gauge | Precision digital pressure gauge | |
1 | Not resistant to vibration, vibration is easy to cause damage. | Resistant to vibration. |
2 | It must be vertical during the verification process. | Vertical or no effect |
3 | The pointer table for measuring liquids has a varying height difference (defects existing in the spring itself) and can only be benchmarked at the center of the table. | No change in liquid column height difference. |
4 | Can only be seen flat, with parallax, readings can only be estimated, and the error is large. | The figures show no parallax. |
5 | The zero point is getting worse. | The zero point is small. |
6 | The temperature coefficient is large. | Temperature compensation, small temperature coefficient. |
7 | Linear and hysteresis. | Linear, low hysteresis. |
8 | Internal cleaning is difficult. | Internal cleaning is easy. |
9 | Do not overload, otherwise it will cause permanent damage. | The overload range is large. |
10 | Not resistant to fatigue. The selection of the pointer type precision pressure gauge must be larger than the gauge to be inspected. Moreover, the same gauge can not be used for the long time to check the checklist of the same limit. | no effect. |
11 | Very poor reliability, frequent maintenance, and difficult maintenance, requiring professional standards. | High reliability and virtually maintenance free. |
12 | Poor sensitivity, the case needs to be knocked when reading. | High sensitivity. |
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