Pressure sensor calibration method Smart transmitters are located between the input pressure source and the generated 4-20mA current signal. In addition to mechanics and circuits, there are also microprocessor chips that operate on the input data. Therefore, calibration is different from conventional methods.

1. First, perform 4-20mA fine adjustment to calibrate the digital-to-analog converter inside the transmitter. Since it does not involve a sensing element, an external pressure signal source is not required.

2. Fine-tune the entire process again to make the 4-20mA digital reading consistent with the actual applied pressure signal. Therefore, a pressure signal source is required.

3. Finally, re-measure the range and adjust the 4-20mA analog output to match the external pressure signal source. Its function is exactly the same as the zero point (Z) and range (R) switches on the transmitter housing.