Issues regarding the zero-point calibration of EJA pressure transmitters
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For EJA single-flange pressure transmitters, for example, if the range is set to -10~10 kPa, it is found during inspection that the zero point has drifted by 1 kPa. When performing zero point calibration, should we carry out a direct zero adjustment, or should we shift the range to -9~11 kPa? Both methods can be used for zero calibration. However, will a direct zero adjustment affect the linearity of the transmitter? Over time, could this lead to increasing errors in the transmitter’s readings?
If the diaphragm box is undamaged, the value read by the hand controller when no force is applied to the diaphragm box should generally be the most accurate zero value.
It will not change the linearity, but we* usually set the lower limit to zero to check the zero point, and then revert it to the original range once everything is fine.