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Reference Manual
00809-0100-4021, Rev GC
Appendix A: Reference Data
April 2014
Reference data
Option Code U2
Average temperature with Hot Backup and sensor drift alert – Warning Mode
Primary Usage Critical applications, such as safety interlocks and control loops. Outputs the
average of two measurements and alerts if temperature difference exceeds
the set maximum differential (Sensor Drift Alert). If a sensor fails, an alert will
be sent and the primary variable will hold working sensor measurement.
Primary Variable Sensor Average
Secondary Variable Sensor 1
Tertiary Variable Sensor 2
Quaternary Variable Terminal Temperature
Option Code U3
Average temperature with Hot Backup and sensor drift alert – Alarm Mode
Primary Usage Critical applications, such as safety interlocks and control loops. Outputs the
average of two measurements and alerts if temperature difference exceeds the
set maximum differential (Sensor Drift Alert).
Primary Variable Sensor Average
Secondary Variable Sensor 1
Tertiary Variable Sensor 2
Quaternary Variable Terminal Temperature
Option Code U4
Two independent sensors
Primary Usage Used in non-critical applications where the digital output is used
to measure two separate process temperatures.
Primary Variable Sensor 1
Secondary Variable Sensor 2
Tertiary Variable Terminal Temperature
Quaternary Variable Not Used
Option Code U5
Differential temperature
Primary Usage The differential temperature of two process temperatures are configured as the
primary variable.
Primary Variable Differential Temperature
Secondary Variable Sensor 1
Tertiary Variable Sensor 2
Quaternary
Variable
Terminal Temperature
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