calibration

LASER TYPE LEVEL TRANSMITTER CALIBRATION-LM200 (ABB)

Tue, 18 Feb 2014 12:36:21 +0100

Calibration Guideline for transmitters

Mon, 03 Feb 2014 12:22:00 +0100

INTERFACE DISPLACER TYPE LEVEL CALIBRATION

Mon, 03 Feb 2014 11:48:31 +0100

Calibration of flow DP transmiter

Sat, 07 Dec 2013 13:14:11 +0100

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

Calibration of DP transmitter

Mon, 05 Aug 2013 15:59:59 +0100

Set up the differential pressure transmitter, HART communicator, power supply, hand pump, and the multimeter as below (see below calibration setup file).
Make sure the equalizing valve manifold is closed.
Apply a pressure to the transmitter equal to a lower range pressure (usually it correspond to 4 mA in the transmitter output). For example we have 0 to 100 mBar calibrated range, then the lower range pressure is 0, or let’s say we have -2 psig to 5 psig then we have lower range pressure equal to -2 psig.
Read the pressure in the transmitter LCD (or in the HART communicator). Adjust (if any) through the HART communicator so that the output of the transmitter (on LCD) is the same with the applied pressure.
Read the mA output of the transmitter by using a multimeter. Adjust (if any) through the HART communicator so that the output of the transmitter (on multimeter) is 4 mA.
Apply a pressure to the transmitter equal to an upper range pressure (usually it correspond to 20 mA in the transmitter output).
Read the pressure in the transmitter LCD (or in the HART communicator). Adjust (if any) through the HART communicator so that the output of the transmitter (on LCD) is the same with the applied pressure.
Read the mA output of the transmitter by using a multimeter. Adjust (if any) through the HART communicator so that the output of the transmitter (on multimeter) is 20 mA.

Typical tools required:

24 VDC power supply
Multimeter digital
Pneumatic hand pump (up to 600 psig)
Hydraulic hand pump (up to 10.000 psig)
Low pressure hand pump
High precision digital test gauge
HART communicator
Screwdriver toolkit