Materials reqd- 1. Data Sheet , 2. Multimeter , 3. Pressure calibrator , 4. Hart Comm , 5. Tester & Slide range

PROCEDURES...
1. Force the transmitter from DCS/PLC if it comes under any tripping circuit.
2. Connect the HART Communicator & note down the LRV , URV , TAG , UNIT , PV , DAMPING etc.
3. Isolate the transmitter from process.
4. Release both side pressure & drain the low and high side liquid by drain valve.
5. Connect pressure calibrator to the high side, keeping low side open to atmosphere.
6. Connect A DMM in series with the circuit to measure the mA.
7. Apply pressure as per data sheet or within calibration range (mmwc).
8. If zero shifted -do the zero trimming from hart or from transmitter side-note down the milli amp - approx-4mA.
9. Apply the pressure in increasing order 7 note down the mA.
10. Now apply the max pressure as per URV and note down the milliamp - 20ma
11. if span shifted do the span adjustment from HART or transmitter side port.
12. Verify the linearity by increasing & decreasing pressure - repeat the steps 2 to 3 times.
13. After adjustment remove HART 7 take the transmitter inline.
14. Fill up the calibration form and keep it for futhure reference.
15. Remove the force & see the value in DCS as per system requirement.


In case of any difficulty you may write to me - pp.ic@rediffmail.com