2.6.2 Alarm and saturation
The Rosemount 3051SMV automatically and continuously performs self-diagnostic
routines. If the self-diagnostic routines detect a failure, the transmitter drives the output
to the configured alarm value. The transmitter will also drive the output to configured
saturation values if the primary variable goes outside the 4–20 mA range values.
The alarm and saturation settings can be configured using Engineering Assistant, AMS
Device Manager, or a Field Communicator. See Alarm and saturation level configuration
for more information. The alarm direction can be configured using the hardware switch on
the feature board. See Configure security (write protect) for more information on the
hardware switch.
The Rosemount 3051SMV has three options for alarm and saturation levels:
• Rosemount (Standard), see Table 2-4
• NAMUR, see Table 2-5
• Custom (user-defined), see Table 2-6
Table 2-4: Rosemount (Standard) Alarm and Saturation Values
Level Saturation Alarm
Low 3.9 mA ≤ 3.75 mA
High 20.8 mA ≥ 21.75 mA
Table 2-5: NAMUR-Compliant Alarm and Saturation Values
Level Saturation Alarm
Low 3.8 mA ≤ 3.6 mA
High 20.5 mA ≥ 22.5 mA
Table 2-6: Custom Alarm and Saturation Values
Level Saturation 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
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
Alarm and saturation level configuration
Mass and energy flow Fast Keys
1, 4, 2, 6, 6
Direct process variable output Fast Keys 1, 4, 2, 6, 6
The Alarm/Sat Levels tab allows the Alarm and Saturation Levels to be configured. To
change alarm/saturation level settings, select the Config Alarm/Sat Levels button.
Reference Manual Configuration
00809-0100-4803 October 2018
Emerson.com/Rosemount 35
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