Emerson Rosemount 3144P, Reference Manual

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Specifications and Reference Data
April 2017
Reference Manual
00809-0100-4021, Rev JA
Specifications and Reference Data
202
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
sends a digital alert if temperature difference exceeds the set maximum differential (Sensor Drift Alert – warning
mode). If a sensor fails, an alert will be sent digitally and the primary variable will be reported as the remaining
good sensor value.
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 sets the analog output into alarm if temperature difference exceeds the set maximum differential
(Sensor Drift Alert – alarm mode). If a sensor fails, an alert will be sent digitally and the primary variable will
be reported as the remaining good sensor value.
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 is configured as the primary variable. If the
temperature difference exceeds the maximum differential, the analog output will go into alarm. Primary
Variable will be reported as a bad sensor value.
Primary variable Differential temperature
Secondary variable Sensor 1
Tertiary variable Sensor 2
Quaternary variable Terminal temperature
Option code U6: Average temperature
Primary usage
When average measurement of two different process temperatures is required. If a sensor fails, the analog
output will go into alarm and the primary variable will report the measurement of the remaining good
sensor.
Primary variable Sensor average
Secondary variable Sensor 1
Tertiary variable Sensor 2
Quaternary variable Terminal temperature