Page 54
STT
850 Series HART/DE Option User’s Manual
Revision 4.0
3.
Click
Yes
to continue. The PV Unit screen will be displayed with a list of measurement units,
as follows
:
Deg C
Deg F
Deg R
Kelvin
mV Ohms
4.
Select the desired
PV Unit
, and click
OK
. A Post Edit action message will be displayed,
indicating if you select this value, the variables that use it as the units code will start in the
previous units until this value is sent to the Transmitter.
5.
Click
OK
to continue or
Abort
to discard the change.
6.
Click
Send
. The Send to Device screen will be displayed.
7.
Select the
PV Unit
check box.
8.
Click
Send
to download the change to the Transmitter or
Return
to continue making
changes.
5.2.12 Setting PV URV, and LRV Range Values
STT850 Transmitters are calibrated at the factory with ranges using deg C For a reverse
range, enter the upper range value as the LRV and the lower range value as the URV.
The LRV and URV values can be entered with the Toolkit keypad or by applying the corresponding
temperature values directly to the Transmitter. Use the following procedure to key in the range
values.
1.
Starting at the My Device menu, make the following menu selections:
Shortcuts > Device Setup > Basic Setup > Device Information > Range values
2.
Click
Edit
. The “Range value” screen will be displayed.
3.
Select
PV LRV
and click
Edit
. You will be warned that if you change the value of the
variable it will change the loop current, which may upset the control process.
4.
Click
Yes
to continue.
5.
Enter the desired PV LRV value. (for example: 5).
6.
Click
OK
. The Range Values menu will be displayed
7.
Choose
Temperature URV
.
8.
Add the desired URV setting value (for example: 45).
9.
Press
ENTER
.
10.
Select the
PV URV
, and click
Edit
. You will be warned that if you change the value of the
variable, it will change the loop current, which may upset the control process.
11.
Click
Yes
to continue.
12.
Click
Return
to go back to the
Basic Setup
menu.
13.
Click
Send
. The Send to Device screen will be displayed.
14.
Select the
Range values
check box,
15.
Click
Send
to download the change to Transmitter, or Click
Return
to continue making
changes.
