Emerson Rosemount 2051 Reference Manual page 56

Configuration
March 2024
Table 3-13: 4–20 mA HART Alarm and Saturation Values
Level
Low
High
Table 3-14: NAMUR-Compliant Alarm and Saturation Values
Level
Low
High
Table 3-15: 1–5 Vdc HART Low Power Alarm and Saturation Values
Level
Low
High
CAUTION
Alarm level values will be affected by analog trim. Refer to
Note
When a transmitter is in an alarm condition, the Field Communicator indicates the analog
output the transmitter would drive if the alarm condition did not exist. The transmitter will
alarm high in the event of failure if the alarm jumper is removed.
3.9.2 Alarm and saturation levels for burst mode
Transmitters set to burst mode handle saturation and alarm conditions differently.
Alarm conditions:
• Analog output switches to alarm value
• Primary variable is burst with a status bit set
• Percent of range follows primary variable
• Temperature is burst with a status bit set
Saturation:
• Analog output switches to saturation value
• Primary variable is burst normally
• Temperature is burst normally
3.9.3 Alarm and saturation values for multidrop mode
Transmitters set to multidrop mode handle saturation and alarm conditions differently.
Alarm conditions:
• Primary variable is sent with a status bit set
56
4–20 mA Saturation
3.9 mA
20.8 mA
4–20 mA Saturation
3.8 mA
20.5 mA
1–5V Saturation
0.97 mA
5.20 mA
4–20 mA Alarm
≤ 3.75 mA
≥ 21.75 mA
4–20 mA Alarm
≤ 3.6 mA
≥ 22.5 mA
1–5V Alarm
≤ 0.95 mA
≥ 5.4 mA
Analog output
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