18
Reference Manual
00809-0200-4728, Rev RA
Section 2: Configuration
April 2015
Contact an Emerson Process Management representative for information on the temperature
sensors, thermowells, and accessory mounting hardware that is available through Emerson
Process Management.
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 Local Operator Interface.
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
644.
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.
Enter 2-wire offset with Field Communicator
Enter 2-wire offset with 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 1
or
Sensor 2
tab
depending on the need. Find the 2-Wire Offset text field and enter the value.
3.
Select
Apply
when complete.
2.6.3
Setting output units
The Units can be configured for a number of different parameters in the 644. Individual Units
can be configured for:
Sensor 1
Sensor 2
Terminal Temperature
Differential Temperature
Average Temperature
First Good Temperature
From the
HOME
screen, enter the Fast Key sequence.
Device Dashboard Fast Keys
2, 1, 1
Содержание Rosemount 644
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