Note
See Table 3 on page 12 to change HART revision when the correct Device
Driver is loaded.
2.5 Trim the transmitter
Devices are calibrated by the factory. Once installed, it is recommended to
perform a zero trim on gage and differential pressure transmitters to
eliminate error due to mounting position or static pressure effects. A zero trim
can be performed using either a Field Communicator or configuration
buttons.
For instructions using AMS Device Manager, see the Rosemount 3051
Reference Manual.
Note
When performing a zero trim, ensure that the equalization valve is open and
all wet legs are filled to the correct level.
Procedure
1. Choose your trim procedure.
a) Analog zero trim – Sets the analog output to 4 mA.
2. Also referred to as a “rerange,” it sets the lower range value (LRV)
equal to the measured pressure.
3. The display and digital HART output remains unchanged.
a) Digital zero trim – Recalibrates the sensor zero.
4. The LRV is unaffected. The pressure value will be zero (on display and
HART output). 4 mA point may not be at zero.
5. This requires that the factory calibrated zero pressure is within a range
of 3% of the URV [0 + 3% x URV].
Example: URV = 250 inH
2
O Applied Zero Pressure = + 0.03 x 250 inH
2
O
= + 7.5 inH
2
O (compared to factory settings) values outside this range
will be rejected by the transmitter.
2.5.1 Trimming with a Field Communicator
Procedure
1. Connect the Field Communicator. See "Connect the wiring and power
up" for instructions.
2. Follow the HART menu to perform the desired zero trim.
Quick Start Guide February 2019
18 Emerson.com/Rosemount
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