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98MANALIDP10AV Rev. A 8/16/11
3. Calibration and Configuration
!
CAUTION
Anytime Calibration (
CALIB
) or Configuration (
CONFIG
) mode is entered, the
transmitter output is automatically set to 1 volt until
Cancel
or
Save
is selected and
the transmitter comes back online. Make sure that the control loop is in manual
before selecting
CALIB
or
CONFIG
.
NOTE
1.
For best results in applications where high accuracy is required, re-zero the
transmitter output once it has stabilized at the final operating temperature.
2.
Zero shifts resulting from position effects and/or static pressure effects can
be eliminated by re-zeroing the transmitter output.
3.
When checking the zero reading of a transmitter operating in the square
root mode, return the output to the linear mode. This will eliminate an
apparent instability in the output signal. Return the transmitter output to
the square root mode after the zero check is complete.
4.
After calibrating transmitters operating with a 4 to 20 mA output signal, check
the underrange and overrange output values to ensure that they extend
beyond 4 and 20 mA respectively.
Calibration Setup
The following sections show setups for field or bench calibration. Use test equipment that is at
least three times as accurate as the desired accuracy of the transmitter. Calibration is performed by
simulating the process differential pressure. This is done by applying a pressure, equal to the dif-
ferential pressure, to one side of the transmitter and then venting the other side of the transmitter.
NOTE
The IDP10-A and IDP10-V transmitters can be re-ranged to a new calibrated range
without application of pressure. See EGU LRV and EGU URV in Figure 24.
Field Calibration Setup
Field calibration is performed without disconnecting the process piping. In order to do this, you
must have bypass and shutoff valves between the process and the transmitter and one of the
following:
Access to the process connections on the non-process side of the transmitter,
or, the optional vent screw in the side of the process covers.
If the transmitter is to be removed from the process for calibration, refer to the “Bench Calibra-
tion Setup” procedure.
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