Emerson Rosemount 3051D, Быстрый старт, Страница: 18 / 40

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