If there is a slight deviation during the measurement by a pressure transmitter, how should it be adjusted?

1. It is necessary to first clarify what the accuracy grade is for the instruments that are out of range. 2. Use percentage of the range as the unit to indicate which specific physical point is out of range; if multiple points are out of range, explain each one separately. 3. Use percentage of the range as the unit to indicate by how much it has exceeded or fallen short. 4. Specify whether it is an overage or a shortage. 5. Well, no matter how complex the problem, it’s nothing too difficult for me; Brother Pig will teach you how to adjust the gauge. . . . . . {:2_32:}

Range: 0–2.5 MPa; accuracy: 0.075. There is a deviation at 8 mA, but the accuracy can reach 0.1

Typically, the transmitter is equipped with potentiometers for range and zero adjustment, which can be adjusted as needed.

Typical transmitters can only be adjusted for their 4mA and 20mA outputs; if these two values are normal, there should be no room for adjustment at 8mA!

Yes, usually when we apply pressure to the platform, we only perform calibration at the zero and full-scale points; we make no adjustments at the intermediate points. If the results are not satisfactory, the sample is sent back to the factory

Are there any pressure transmitters whose internal settings can be adjusted via HART or other software?

Have you ever seen pressure transmitters with an electronic output section that allows for intermediate adjustments via Hart or other software, so as to make the gauge readings linear?

This post was last edited by 1111111 on 2018-6-13 at 14:22. 1. The **measurement verification regulations JJG882-2004 for pressure transmitters do not include a 0.075 accuracy class; the available classes are 0.05 and 0.1. 2. If you take all those instruments claimed to have an accuracy of 0.075 to a calibration institute, the institute can only issue certificates stating that their accuracy is 0.1. 3. In other words, if your instrument shows a slight deviation of 0.075% FS at 8 mA, it doesn’t matter if you ignore it! Legally speaking, it is still considered an instrument with an accuracy of 0.1. 4. Of course, if you really want to be precise: first, you can adjust the zero point slightly, so that it is within 0.03% FS below the true zero; second, you can adjust the full-scale value slightly, so that it is within 0.07% FS below the true full scale. 5. Watches with a precision of 0.075 are probably imported ones; domestic watches, which abide by regulations, won’t claim such a high precision level. Domestic manufacturers that are capable will clearly indicate precision levels of 0.05, 0.02, or 0.01. 6. I’m not sure whether imported watches can be adjusted for the 8mA point; the watches developed by me support adjustment on a per-point basis—but you basically won’t need this function. For devices with excellent linearity like those with 0.01% FS precision, there’s no need to make adjustments. If you have high requirements, feel free to try my watches: digital pressure gauges with no zero drift or pressure variation, and pressure calibration instruments—all of these are manufactured by my company

This post was last edited by 1111111 on 2018-6-13 at 23:31. The manual pump mentioned above is the one with the highest sensitivity for adjustment in the world; it was designed by Pig Brother over 10 years ago. ...................... .......... Sensitive yet resilient, sensitive yet happy — that is also its true nature. :P

That makes sense; in practice, as long as the stability is good, grade 0.1 is sufficient