16
Reference Manual
00809-0100-4107, Rev BA
Section 2: Configure
April 2013
Figure 2-7. 4-20 mA HART square root output transition point
A. Square Root Curve
B. 5% Transition Point
C. 4% Transition Point
2.6.3
Rerange the transmitter
The Range Values command sets each of the lower and upper range analog values (4 and 20
mA/1-5 Vdc points) to a pressure. The lower range point represents 0% of range and the upper
range point represents 100% of range. In practice, the transmitter range values may be changed
as often as necessary to reflect changing process requirements. For a complete listing of Range
& Sensor limits, refer to
“Range and sensor limits” on page 106
.
Select from one of the methods below to rerange the transmitter. Each method is unique;
examine all options closely before deciding which method works best for your process.
Rerange by manually setting range points with a Field Communicator, AMS Device
Manager, or Local Operator Interface.
Rerange with a pressure input source and a Field Communicator, AMS Device Manager,
Local Operator Interface, or local zero and span buttons
Manually rerange the transmitter by entering range points
Entering range points with a Field Communicator
Entering range points with AMS Device Manager
Right click on the device and select
Configure
:
1.
Click
Manual Setup
and select
Analog Output
.
2. Enter upper and lower range values in the
Range Limits
box and click
Send.
3. Carefully read the warning and click
Yes
if it is safe to apply the changes.
From the
HOME
screen, enter the fast key sequence
Device Dashboard Fast Keys
2, 2, 2, 1
A
B
C
0.5
1
% Pressure Input
4mA
0
0
10
20
30
40
50
60
70
80
90
100
4mA
20mA
% Pressure Input
A
B