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Reference Manual
00809-0100-4021, Rev DA
November 2004
A-17
Rosemount 3144P
To custom configure the 3144P with the dual-sensor option transmitter for one
of the applications described below, indicate the appropriate option code in
the model number. If a sensor type is not specified, the transmitter will be
configured for two 3-wire Pt 100 (α = 0.00385) RTDs if any of the following
option codes are selected.
Option Code U1
Hot Backup Configuration
Primary Usage Primary usage sets the transmitter to automatically use sensor 2 as the primary input if sensor 1 fails.
Switching from sensor 1 to sensor 2 is accomplished without any effect on the analog signal.
Primary Variable Sensor 1
Secondary Variable Sensor 2
Tertiary Variable Terminal Temperature
Quaternary Variable Not Used
Option Code U2 Average Temperature with Hot Backup and Sensor Drift Alarm – 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
alarm). 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 Alarm – 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
alarm).
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