Emerson Rosemount 3101, Reference Manual

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159
Reference Manual
00809-0100-4840, Rev CB
Appendix F: Programming the 3102 and 3105 using HART
February 2015
Programming the 3102 and 3105 using HART
F.3.18 Upper range value (P015)
This defines the process value (PV) represented by a 20 mA output from the transmitter.
The span of the 4–20 mA current output is defined by the Upper Range Value parameter and the
Lower Range Value parameter (
page 160 ).
As an example, consider a tank with a 120 gallons capacity. When full, a 20 mA output current is
required from the transmitter. Therefore, the upper range value is set to 120 if the PV is in gallon
units. The lower range value is typically set to 0 (gallons) for the 4 mA output to indicate an
empty tank.
The upper range value can be less than the lower range value, in which case the current output
will decrease for an increasing process value (PV).
Note
The upper range value is automatically overwritten when the Tank Shape/NLP parameter is used
to select a flume flow profile, but the populated value can still be edited if required.
See
Table F-1 on page F-152 for the 20 mA point values.
Note
The displayed units are selected using the parameter Primary Variable Units ( page 153 ).
Changing units does not re-scale the upper range value.
Field Communicator or AMS Device
Manager
To view or change the upper range value
1. From the Home screen, select 2: Configure.
2. Select 2: Manual Setup.
3. Select 1: Basic Setup.
4. Select 3: Upper Range Value P015.
5. If a change is required:
(a) Input a new value, and then select “ENTER” to save it.
(b) Select “Send” or “Apply” to update the transmitter.
Note
When messages appear, take appropriate action if needed and select “OK”.
Fast Keys
2, 2, 1, 3
Upper Range Value P015
34.5 ft
34.5
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