Detailed Transmitter Setup; Configuring Alarm And Saturation Levels - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0100-4107, Rev CA
Figure 2-12. Display with LOI
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2.8

Detailed transmitter setup

2.8.1

Configuring alarm and saturation levels

In normal operation, the transmitter will drive the output in response to pressure from the lower to
upper saturation points. If the pressure goes outside the sensor limits, or if the output would be beyond
the saturation points, the output will be limited to the associated saturation point.
The Rosemount 2051 Transmitter automatically and continuously performs self-diagnostic routines. If
the self-diagnostic routines detect a failure, the transmitter drives the output to configured alarm and
value based on the position of the alarm switch. See
Table 2-4. Rosemount Alarm and Saturation Values
Level
Low
High
Table 2-5. NAMUR-Compliant Alarm and Saturation Values
Level
Low
High
Table 2-6. Custom Alarm and Saturation Values
Level
Low
High
Failure mode alarm and saturation levels can be configured using a Field Communicator, AMS Device
Manager, and the LOI. The following limitations exist for custom levels:
Low alarm level must be less than the low saturation level

High alarm level must be higher than the high saturation level

Alarm and saturation levels must be separated by at least 0.1 mA

The configuration tool will provide an error message if the configuration rule is violated.
Configuration
4—20 mA saturation
3.9 mA (0.97 V)
20.8 mA (5.2 V)
4—20 mA saturation
3.8 mA (0.95 V)
20.5 mA (5.125 V)
4—20 mA saturation
3.7 mA to 3.9 mA
20.1 mA to 22.9 mA
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%RANGE (on/off)
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"Setting transmitter alarm" on page
4—20 mA alarm
3.75 mA (0.95 V)
 21.75 mA (5.4 V)
4—20 mA alarm
3.6 mA (0.9 V)
22.5 mA (5.625 V)
4—20 mA alarm
3.6 mA to 3.8 mA
20.2 mA to 23.0 mA
Configuration
July 2017
53.
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