Answer / guest

Probably HART communicator used for online & onfield
calibration.As per my experience,I always used to do
calibration by step given bellow:
1.First,put transmitter loop in CAL mode.In CAL mode
controller the hold last PV for reference.causes without
stop or disturb process we can do calibration earlier
(depends on process)
2.Connect HART to the transmitter +ve & -ve
terminal.observed parameter on HART
display.e.g.pressure,dp,current output singnal.& note down.
3.Then close the isolation valve of both HP & LP tapping &
loose the both HP & LP side vent plug.In this condition
transmitter shoud show zero dp because same atmospheric
pressure actig both side.If transmitter showing zero dp
transmitter is normal & If it is not showing zero,then
there is some error in dp.
4.If transimtter showing error in dp then on HART go to
diagnosis-calibration-sensor calibration-dp trim.enter the
zero dp at atmospheric condition and come back on basic
setup display,transmitter will showing 4 mA current
output.means calibration is ok.then u can take transmitter
on line.and don't forget to checked leakage from impulse
tubing & vent plug.

Another procedure is Bench calibration.Using pressure &
calibrator we can check transmitter.even without HART we
can do bench calibration.

Answer / swapnil dhamanse

Probably HART communicator used for online & onfield
calibration.As per my experience,I always used to do
calibration by step given bellow:
1.First,put transmitter loop in CAL mode.In CAL mode
controller the hold last PV for reference.causes without
stop or disturb process we can do calibration earlier
(depends on process)
2.Connect HART to the transmitter +ve & -ve
terminal.observed parameter on HART
display.e.g.pressure,dp,current output singnal.& note down.
3.Then close the isolation valve of both HP & LP tapping &
loose the both HP & LP side vent plug.In this condition
transmitter shoud show zero dp because same atmospheric
pressure acting both side.If transmitter showing zero dp
transmitter is normal & If it is not showing zero,then
there is some error in dp.
4.If transimtter showing error in dp then on HART go to
diagnosis-calibration-sensor calibration-dp trim.enter the
zero dp at atmospheric condition and come back on basic
setup display,transmitter will showing 4 mA current
output.means calibration is ok.then u can take transmitter
on line.and don't forget to checked leakage from impulse
tubing & vent plug.

Another procedure is Bench calibration.Using pressure &
calibrator we can check transmitter.even without HART we
can do bench calibration.

Answer / deepak kumar

for DPT calibration on the field :
1.at first go the field and check our tag number to which u calibrate
2.then first close the both HP & HP side isolation valve,open the equaliser valve
3.open the vent valve
(for zero triming there is pressure flow)
4.then connect the HART communicator at ve and -ve terminal
5.open the hart =>>device setup=>>diagnosis=>>calibration=>>sensor calibration =>>dp trim=>>then enter Zero trim at atmospheric pressure
(that solve)
NOTE:-after complete the calibration close it to it's normal conditions..
.
thanx...

Answer / venkatesh

First do the 0 trime and span trim, In this it self problem
will solve....ealse use hand pump in point(In HP or LP side
it's deponds up on the usage) applay the pressure check the
reading

Answer / guest

ICON CONTROLS PVT. LTD.

Answer / malchom

You can not accurately calibrate a differential pressure transmitter with a HART communicator. A communicator is just that. A communicator, not a calibrator. The communicator is displaying to the user the pressure input and ma output units that the transmitter "thinks" it is seeing and sending. These values may be quite different than the actual values being applied and sent as indicated by pressure and current calibrators which have themselves been calibrated using a known standard. You can use the communicator to adjust the transmitter to then match your calibration equipment.

Answer / vimalraj

Hart communicator is a hart of DPT Transmitter.is not a calibirator .only we connect and see the pressure , range ,MA,%., units.and also we can modified the configuration of transmitter in online mode. if any major problem for a transmitter only we do that bench calibiration using by DRUK Calibirator or handpumb

Answer / praful lilhare

first of all connect the 250 ohm resistence in series while
connecting the HART to DPT for communication tnen close all
tabs and adjust zero.we can also adjust the range,unit by
using HART communicator.

WE Know that different supply voltage of solenoid valve like 24,110,220 etc..how we check the solenoid supply is 24v or 220 NOTE: No specification at device.

2 Answers   OMV,

principle of rtd

4 Answers  

while am calibrating Drager polytron 2IR flame gas detector occured non zero status.how can i get zero status?

0 Answers   Gasco,

How does your previous experience relate to the job you are applying for ?

0 Answers  

What does a fire detector detects?

4 Answers   GAIL,

TRANSDUSER MOSTLY CONVERT WHICH ENERGY INTO ENERGY ?

6 Answers   DVC,

Technician A says that a fuel tank sending unit will have a high resistance only when the tank is full. Technician B says that its resistance when the tank is full depends on whether the sending unit is designed for use with a bimetallic gauge or with a magnetic gauge. Who is correct?

3 Answers  

If the on Of the DO module is off in the System cabinet, then what is the Procedure to check weather the Module is working or not.

2 Answers   Honeywell,

What is meant by cold float of compressor shaft.

1 Answers   Sabic,

What is critcal speed. what is resonant frequency. why we want to cross crtcal speed on higher RPM (early).

0 Answers  

How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

what is the differnce betweeen hart and smart tx

3 Answers