Emerson Rosemount 2051 Series Quick Start Manual page 16

Quick Start Guide
1. Choose your trim procedure
a. Analog Zero Trim – Sets the analog output to 4 mA.
Also referred to as a "rerange," it sets the Lower Range Value (LRV) equal

to the measured pressure.
The display and digital HART output remains unchanged.

b. Digital Zero Trim – Recalibrates the sensor zero.
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 URL [0 ± 3% x URL].
Example
URV = 250 inH
Applied Zero Pressure = + 0.03
factory settings) values outside this range will be rejected by the
transmitter.
Trimming with a Field Communicator
1. Connect the Field Communicator, see
for instructions.
page 9
2. Follow the HART menu to perform the desired zero trim.
Table 5. Zero Trim Fast Keys
Fast Key Sequence
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 14. External configuration buttons
LOI
Use the following procedures to perform a Zero Trim:
16
O
2
Analog Zero (Set 4 mA)
Analog Zero and Span

250 in H O = + 7.5 inH
2
"Connect the wiring and power up" on
3, 4, 2
Digital Zero
O (compared to
2
Digital Zero
3, 4, 1, 3
.
Figure 12
Configuration Buttons
A.
May 2013