93
Reference Manual
00809-0100-4803, Rev GA
Operation and Maintenance
September 2017
Operation and Maintenance
To correct for mounting position effects on transmitters equipped with an absolute static pressure
sensor, perform a lower sensor trim. This is accomplished by selecting the Lower Sensor Trim button
and following the on-screen prompts. The lower sensor trim function provides an offset correction
similar to the zero trim function, but it does not require a zero-based input.
Upper and lower sensor trim
To perform a Static Pressure Full Sensor Trim, perform the following procedure:
1. Select the Lower Sensor Trim button and follow the on-screen prompts.
2. Select the Upper Sensor Trim button and follow the on-screen prompts.
Note
It is possible to degrade the performance of the transmitter if the full sensor trim is done improperly or
with inaccurate calibration equipment. Use a pressure input source that is at least three times more
accurate than the transmitter and allow the pressure input to stabilize for ten seconds before entering
any values.
Recall factory trim
The Recall Factory Trim button will restore the transmitter to the original factory characterization
curve. The Recall Factory Trim button can be useful for recovering from an inadvertent zero trim or
inaccurate pressure source.
When the recall factory trim function is used, the transmitter’s upper and lower trim values are set to the
values configured at the factory. If custom trim values were specified when the transmitter was ordered,
the device will recall those values. If custom trim values were not specified, the device will recall the
upper and lower sensor limits.
Last static pressure sensor trim
The current upper and lower trim points can be seen under the Last Static Pressure Sensor Trim Points
heading.
Calibration type
The calibration type drop-down menu allows the user to note the type of device last used to calibrate the
sensor (either Differential, Gage, or Absolute). This field does not affect the calibration of the device.
4.3.5 Process temperature sensor calibration
The Temperature Calibration tab allows the user to perform a sensor trim and configure the sensor
matching of a process temperature sensor, see Figure 4-4 on page 94.
Mass and energy flow Fast Keys
1, 2, 5, 5
Direct process variable output Fast Keys
1, 2, 4, 5
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