Trimming And Calibration Set Up; Sensor Trim; Sensor Zero Trim; Sensor Zero Trim By Cometer - ABB 2600T Pressure Transmitter Series User Manual

364xS User's Manual

Trimming and Calibration Set Up

The calibration requires a stable Pressure Generator and a
Reference Pressure Indicator with the appropriate accuracy (at
least 4 times better than the required accuracy of the
transmitter/measuring-chain).
The pneumatic circuit shall be verified to exclude connection
leakage problem or plugged lines.
The picture on the right show the complete test rigs that can
be selectively used to suit the calibration for the Pressure
(gauge) and the Differential transmitters.
Before the calibration ensure that:
• the required span, the upper and lower range value (URV
and LRV) are within the span and range limits (URL and
LRL) indicated on the nameplate
• the transmitter is properly powered and the electrical
connections correctly made.
• the write protect switch, located on the electronics module
is in position OFF (write allowed).
Make the electrical connections as indicated in the picture.
Connect a precision milliammeter as shown and remove the
short circuit link.

Sensor trim

The Sensor trim is a "set of operations, which establishes, by reference to standards, the relationship which
exists, under specified conditions, between a reference indication and a result of a measurement"
(International Vocabulary on Metrology).
In case the detected errors exceed the required accuracy, it is possible to correct the transmitter settings to
compensate these errors.
If the PV scaling has been performed the sensor trim is not available.
Reset the PV scaling before continuing the Sensor trim.
NOTE: If this cannot be accomplished, the instrument may require a factory calibration or even its
substitution.

Sensor Zero Trim

The Sensor Zero trim provide the correct offset of the factory characterization. The transmitter shall be within
five percent of the true zero.
If the PV scaling has been performed the sensor trim is not available.
Reset the PV scaling before continuing the Sensor trim.

Sensor Zero trim by CoMeter

Sensor Zero trim by CoMeter is available with the 695 Field Indicator. Please refer to the device manual for
the appropriated operations.
48
Power Supply
10.5 to 42 V dc
Precision
Milliameter
Operation