Configuring The Sensor(S) - Emerson Rosemount 644 with HART Protocol Reference Manual

Reference Manual
00809-0200-4728, Rev SA
LOI
Reference
Figure 2-5. Configuring Sensors with LOI
VIEW CONFIG
SENSOR CONFIG SENSOR CONFIG
UNITS
RERANGE
LOOP TEST
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* Available only if option code (S) or (D) is ordered.
Contact an Emerson
accessory mounting hardware that is available through Emerson.
2-wire RTD offset
The 2-wire offset feature allows the measured lead wire resistance to be input and corrected for, which
results in the transmitter adjusting its temperature measurement for the error caused by this added
resistance. Because of a lack of lead wire compensation within the RTD, temperature measurements
made with a 2-wire RTD are often inaccurate.
This feature can be configured as a subset of the Sensor Configuration process in the Field
Communicator, AMS Device Manager, and the LOI.
To utilize this feature properly perform the following steps:
1. Measure the lead wire resistance of both RTD leads after installing the 2-wire RTD and Rosemount
644 Transmitter.
2. Navigate to the 2-wire RTD Offset parameter.
3. Enter the total measured resistance of the two RTD leads at the 2-wire Offset prompt to ensure
proper adjustment. The transmitter will adjust its temperature measurement to correct the error
caused by lead wire resistance.
Field Communicator
From the HOME screen, enter the Fast Key sequence.
Device Dashboard Fast Keys
AMS Device Manager
1. Right click on the device and select Configure.
2. In the left navigation pane select Manual Setup and select the Sensor 1or Sensor 2 tab depending
on the need. Find the 2-wire offset text field and enter the value.
3. Select Apply when complete.
Configuration
Figure 2-5 for guidance on where to find Sensor Configuration in the LOI menu.
™
representative for information on the temperature sensors, thermowells, and
VIEW SENSOR VIEW SENSOR
SENSOR CONFIG SENSOR CONFIG
BACK TO MENU
EXIT MENU
2, 1, 1
Configuration
VIEW S1 CONFIG
VIEW S2 CONFIG*
BACK TO MENU
EXIT MENU
SENSOR 1 CONFIG
SENSOR 2 CONFIG*
BACK TO MENU
EXIT MENU
July 2018
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