DP Flow Transmitter Calibration- Transmitter Zero and Span Adjustment

calibration procedure for Differential Pressure Transmitter. How to do DP Transmitter Zero and Span Adjustment . This calibration video also shows square root calculation for DPT.
If you have any questions regarding square root calculations, do ask me in the comment box. And please let us know if you need videos on some specific topics related to instrumentation such as level measurement , flow measurement , pressure measurement and lot more.
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Testing and Calibration for DPT.
Step-1 Remove the DP transmitter from service before any calibration or checks can be performed.
In order to remove the DP transmitter from service,
1. Close the low pressure block valve first by turning the valve in clockwise direction.
2. Open the equalizing valve by turning the valve in counter clockwise direction.
3. Close the high pressure valve by turning the valve in clockwise direction.
Step-2 When DP Transmitter is out of service, remove the fitting from drain port of high pressure side. And connect one end of 1/4 inch pneumatic fitting to high port side of DP transmitter, and other end to pressure calibrator.
Sometimes, you may need 1/2 inch pneumatic fitting. So, it is advisable to keep entire set of
pneumatic fittings with you.
Now, remove the fittings from the drain port of low pressure side, and leave it open during entire calibration time.
In order to set the unit in pressure calibrator, press configuration button and then press down button until you see inch W C unit on the screen.
Select this unit and press ok button after this.
Step-3 Now, connect digital voltmeter in series with DPT.
Step-4 We need a range for DP transmitter.
Let's assume that, 0 to 100 Inches WC is the range for DP transmitter..
We also need is calibration table or chart.
In this example, we ignore square root extractor. This is a reason that, current output is not linear in this table.
First of all, we are going to check to see, If transmitter needs to be adjusted.
Here, we will apply desired pressure input values from the calibration table, and we will check the current output in digital volt meter.
First of all, check the analog current output in digital voltmeter, when there is no pressure applied to transmitter. In our case, it is zero percentage input or zero inches water column.
Current Output should be four milliamperes. If it is not four milliamperes, adjust zero until it becomes zero.
Now, apply hundred percentage input which is hundred inches water column pressure to the transmitter, and adjust span until it gives twenty milliamperes output.
Repeat the steps until adjustments are no longer required.
Step-5 After calibration, put the transmitter in a service by opening the Equalizing Valve first, then opening the High Pressure Block Valve second, and open the Low Pressure Block Valve.
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