Reference Manual
00809-0100-4690, Rev FC
June 2011
Rosemount 2088 and 2090
3-14
DETAILED SETUP
Failure Mode Alarm and
Saturation
As part of normal operation, the Rosemount 2088/2090 Pressure Transmitter
continuously monitors its own operation. This automatic diagnostic routine is
a timed series of checks repeated continuously. If the diagnostic routine
detects a failure in the transmitter, the transmitter drives its output either
below or above specific values depending on the position of the failure mode
jumper or switch.
The values to which transmitters drive their output in failure mode depend on
whether they are factory-configured to standard or NAMUR-compliant
operation. The values for each are as follows:
Table 3-2. 4-20 mA HART
Alarm and Saturation Values
Table 3-3. NAMUR-Compliant
Alarm and Saturation Values
Table 3-4. 1-5 Vdc HART
Low-Power Alarm and
Saturation Values
To determine the failure mode configuration of your transmitter, review the
failure mode options using a Field Communicator.
NOTE
The failure mode configuration, whether standard or NAMUR-compliant, is
configured at the factory and can not be changed in the field.
Level 4–20 mA Saturation 4–20 mA Alarm
Low 3.9 mA 3.75 mA
High 20.8 mA 21.75 mA
Level 4–20 mA Saturation 4–20 mA Alarm
Low 3.8 mA 3.6 mA
High 20.5 mA 22.5 mA
Level 1–5 V Saturation 1–5 V Alarm
Low 0.97 V 0.95 V
High 5.20 V 5.4 V
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