Detailed Setup; Failure Mode Alarm And Saturation - Emerson Rosemount 2051 Reference Manual

Rosemount 2051

DETAILED SETUP

Failure Mode Alarm and
Saturation
Table 3-2. 4-20 mA HART
Alarm and Saturation Values
3-16
a. Select 1 Sel dec pt pos. Choose the decimal point representation
that will provide the most accurate output for your application. For
example, when outputting between 0 and 75 GPM, choose
XX.XXX or use the decimal point examples below:
NOTE:
Make sure the selection has been sent and the decimal point has changed
before proceeding to the next step.
b. SEND
4. To specify a custom upper range value:
a. Select 2 CM Upper Value. Type the value that you want the
transmitter to read at the 20 mA point.
b. SEND
5. To specify a custom lower range value:
a. Select 3 CM Lower Value. Type the value that you want the
transmitter to read at the 4 mA point.
b. SEND
6. To define custom units:
a. Select 4 CM Units. Enter the custom units (five characters
maximum) that you want the display to display.
b. SEND
7. To choose the transmitter transfer function for the display:
a. Select 5 CM xfer fnct. Enter the transmitter transfer function for the
display. Select sq root to display flow units. The custom meter
transfer function is independent of the analog output transfer
function.
8. Select SEND to upload the configuration to the transmitter.
The 2051 transmitters automatically and continuously perform self-diagnostic
routines. If the self-diagnostic routines detect a failure, the transmitter drives
its output outside of the normal saturation values. The transmitter will drive its
output low or high based on the position of the failure mode alarm jumper.
See Table 3-2, Table 3-3, and Table 3-4 for failure mode and saturation output
levels. To select alarm position, see "Configure Security and Alarm" on
page 2-22.
Level
Low 3.9 mA
High 20.8 mA
XXXXX
XXXX.X
XXX.XX
XX.XXX
X.XXXX
4–20 mA Saturation 4–20 mA Alarm
≤ 3.75 mA
≥ 21.75 mA
Reference Manual
00809-0100-4101, Rev AA
July 2008