56
Reference Manual
00809-0200-4840, Rev BA
December 2014
Section 4: Configuration
4.3.18
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 (
).
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
for the 20 mA point values.
The displayed units are selected using the parameter
Primary Variable Units
(see
). Changing units does not re-scale the upper range value.
Field Communicator or AMS
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.
Input a new value, and then select “
ENTER
” to save it.
6.
Press “
SEND
” to update the transmitter.
Note
When messages appear, take appropriate action if needed and press “
OK
”.
Rosemount 3490 Series Control Unit
To view or change the upper range value:
1.
From the
Main Menu
screen, select
SETUP
.
2.
Select the transmitter (e.g. “
Tx1: 3107
”).
3.
Select
OUTPUT
.
Fast Keys
2, 2, 1, 3
Upper Range Value P015
10.0 ft
10.0
ESC
DEL
ENTER
HELP
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0
7
4
1
8
5
2
9
6
3
i
k
o
l
FN
(Field Communicator Screen)
Up Range Val P015
10.000ft
Esc=Quit =Edit
(Rosemount 3491 Screen)
Содержание 3107
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