Emerson Rosemount 3051S Reference Manual page 37

Reference Manual
00809-0100-4804, Rev AA
January 2011
Figure 3-1. Zero and Span
Buttons
Alarm and Saturation
Levels
2, 1, 1, 5
Fast Keys
Table 3-2. Alarm and Saturation
Values
Rosemount 3051S ERS System
Zero
The 3051S ERS system automatically and continuously performs
self-diagnostic routines. If a self-diagnostic routine detects a failure, the ERS
system will drive the output to the configured alarm value that is based on the
position of the failure mode alarm switch (see Configure Security and Alarm
on page 2-13). The ERS system will also drive the output to configured
saturation values if the applied pressure goes outside the 4-20 mA range
values.
The 3051S ERS system has three options for configuring the failure mode
alarm and saturation levels:
NOTE
The ERS system will drive the output to alarm level (high or low) if the
pressure applied to either sensor is outside of the LRL or URL limits.
Rosemount (Standard) Alarm and Saturation Values
Switch Position
Low
High
NAMUR-Compliant Alarm and Saturation Values
Switch Position
Low
High
Custom Alarm and Saturation Values
Switch Position
Low
High
Additional considerations when using Custom Alarm and Saturation Values:
• Low alarm must be less than low saturation
• High alarm must be higher than high saturation
• Alarm and saturation levels must be separated by at least 0.1 mA.
Span
Saturation Level
3.9 mA
20.8 mA
Saturation Level
3.8 mA
20.5 mA
Saturation Level
3.7 mA — 3.9 mA
20.1 mA — 21.5 mA
Alarm Level
 3.75 mA
 21.75 mA
Alarm Level
 3.6 mA
 22.5 mA
Alarm Level
3.54 mA — 3.8 mA
20.2 mA — 23.0 mA
3-5