Emerson Rosemount 2051, Справочное руководство, Страница: 31 / 228

21
Reference Manual
00809-0100-4107, Rev BA
Section 2: Configure
April 2013
Configuration
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
“Setting Transmitter
alarm” on page 61 .
Table 2-4. Rosemount alarm and saturation values
Table 2-5. NAMUR-Compliant alarm and saturation values
Table 2-6. Custom Alarm and Saturation Values
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.
Level 4–20 mA saturation 4–20 mA alarm
Low 3.9 mA (0.97 V)

3.75 mA (0.95 V)
High 20.8 mA (5.2 V)

21.75 mA (5.4 V)
Level 4–20 mA saturation 4–20 mA alarm
Low 3.8 mA (0.95 V)

3.6 mA (0.9 V)
High 20.5 mA (5.125 V)

22.5 mA (5.625 V)
Level 4–20 mA saturation 4–20 mA alarm
Low 3.7 mA - 3.9 mA 3.6 mA - 3.8 mA
High 20.1 mA - 22.9 mA 20.2 mA - 23.0 mA