Emerson Rosemount 2090P Quick Start Manual page 15

January 2018
b. Digital zero trim – recalibrates the sensor zero.


Example
URV = 250 inH
Applied Zero Pressure = +0.03 x 250 inH
settings) values outside this range will be rejected by the transmitter
6.1 Trimming with a Field Communicator
1. Connect the Field Communicator, see
page 8
2. Follow the HART menu to perform the desired zero trim.
Table 6. Zero Trim Fast Keys
Fast Key sequence
6.2 Trimming with configuration buttons
A zero trim is to be performed using one of the three possible sets of external
configuration buttons located under the top tag.
To access the configuration buttons, loosen the screw and slide the tag on the
top of the transmitter. Confirm the functionality using
Figure 12. External Configuration Buttons
A
A. Configuration buttons
B. LOI
C. Analog zero and span
D. Digital zero
Use the following procedures to perform a zero trim:
Perform trim with LOI (option M4)
1. Set the transmitter pressure.
2. See Figure 10 on page 13
a. Select Rerange to perform an analog zero trim.
b. Select Zero Trim to perform a digital zero trim.
The LRV is unaffected. The pressure value will be zero (on display and
HART output). 4 mA point may not be at zero.
This requires that the factory calibrated zero pressure is within a range
of 3% of the URV [0 ± 3% x URV].
O
2
for instructions.
Analog zero (Set 4 mA)
3, 4, 2
O = +7.5 inH
2
"Connect the wiring and power up" on
B
for the operating menu.
Quick Start Guide
O (compared to factory
2
Digital zero
3, 4, 1, 3
Figure 10.
C
D
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