Use Of The Green Key - Trim Key; Use Of The Green Keys - Trim - Calibration - Reranging Option - ABB 691HT Operating Instructions Manual

USE OF THE GREEN KEY - TRIM KEY

Transmitter parameters which can be calibrated or operations aiding in instrument checkout may be accessed by
the use of the Trimming and Setup Menu accessible via the TRIM dedicated function key. The access to this
operation is protected by a password, as already explained for CONF dedicated Function Key.
This items are organized into four procedures as shown below:
For all HART Transmitter of other manufacturers
Sensor Trim
Zero Align
For Deltapi K Pressure Transmitter
Sensor Trim
Full Trim
Zero Trim
Stat Trim
For KST Temperature Transmitter
Sensor Trim
User Trim
Factory Trim
For 652/653 S Temperature Transmitter
Sensor Trim
Not Available
For 600T and 600T EN Pressure Transmitter
Sensor Trim
Full Trim
Zero Trim
Stat Trim
Factory Trim (Rev. 5.2 on wards)
Use of the Green Keys - TRIM - Calibration - Reranging option (Not for 652/653 S Temperature transmitter)
Unlike the Ranging operation, that is essentially an
operation of configuration performed through the digital
setting of the value of the LRV and URV, the Reranging
operation requires the physical connection of the tran-
smitter to an input source and the setting of the range
values is directly performed by the transmitter itself
directed by a suitable command.
This operation is the same as the setting of the zero and
span by the use of the optional local adjustments fitted
on the pressure transmitters housing.
The reranging can be used either to set the transmitter
to a new calibration or, for the pressure transmitter, to
adjust the calibration to the installation effects, like tilt
position, wet leg on positive or negative connection in
level measurement, etc.
4 - 20 Trim
4 to 20 mA Trim
Other scale
4 - 20 Trim
4 to 20 mA Trim
Other scale
4 - 20 Trim
4 to 20 mA Trim
Other scale
4 - 20 Trim
4 to 20 mA Trim
Other scale
Factory Trim
4 - 20 Trim
4 to 20 mA Trim
Other scale
Factory Trim
Loop Test
4 mA Output
20 mA Output
Other mA Output
Loop Test
4 mA Output
20 mA Output
Other mA Output
Loop Test
4 mA Output
20 mA Output
Other mA Output
Loop Test
4 mA Output
20 mA Output
Other mA Output
Loop Test
4 mA Output
20 mA Output
Other mA Output
The difference between this procedure and the
Ranging procedure, which uses digital values, is
the fact that a change in the zero point value in this
procedure does not affect the span.
Another point that should be taken into consideration
during an operation of reranging is that the setting of the
initial and final point of your range depends directly of
the real input. Although the analog output of the
transmitter is correct in relation to the applied input, the
digital reading of the Process Value can indicate a
slightly different value. The difference, due to inaccu-
racy of the testing equipment or to installation effects,
can be corrected using the trimming option.
Reranging
Ranging to Applied Value:
- Set 4 mA Point
- Set 20 mA Point
Reranging
Ranging to Applied Value:
- Set 4 mA Point
- Set 20 mA Point
Reranging
Ranging to Applied Value:
- Set 4 mA Point
- Set 20 mA Point
Reranging
Not Available
Reranging (for 600T)
Ranging to Applied Value:
- Set 4 mA Point
- Set 20 mA Point
Calibration (for 600T EN)
PV Scale
Output %
Reranging - as above for 600T
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