Zero-point measurement issue of differential pressure transmitters
Thread Content
May I ask how to use a multimeter to calibrate the zero point of a differential pressure transmitter?
The zero-point output current can be measured at 4 mA, but the accuracy and number of digits of the meter must be 1/3 of those of the differential pressure transmitter.
For users, it is generally sufficient to adjust the range; the zero setting has already been done before manufacturing.
A multimeter can be used for a simple assessment, but verification is not possible as the accuracy of a multimeter is not sufficient. One can only read zero; simply connect the milliampere range of the multimeter in series with the output terminal of the transmitter.
This post was last edited by Wang Tianze on 2016-10-30 at 18:55. In other words, it’s like having a wrench, **********. If you are studying instrumentation, it is recommended that you go through the textbooks again.
For a regular differential pressure gauge, simply close the high and low pressure sides of the three-valve assembly and open the balance valve; if the reading is 0 and the measurement current is 4 mA, then everything is normal:lol
This post was last edited by cqdfwy on 2016-11-3 at 11:52. Generally, once the range is set, it can be used for a long time (unless the transmitter has poor performance or high usage requirements), but the zero point may drift over time; therefore, it needs to be checked regularly, and adjustments may sometimes be necessary.