Emerson Rosemount 3051 Manual page 34

Configuration
March 2023
Figure 2-14: Voltage deviation limit
A. Voltage deviation limit
B. Terminal voltage
C. Alert
NOTICE
Changes in electrical loop
Severe changes in the electrical loop may inhibit HART
reach alarm values. Therefore, Emerson cannot absolutely warrant or guarantee that the
correct Failure alarm level (High or Low) can be read by the host system at the time of
annunciation.
Resistance
This value is the calculated resistance of the electrical loop (in Ωs) measured during the
characterize loop procedure. Changes in the resistance may occur due to changes in
the physical condition of the loop installation. You can compare baseline and previous
baselines to see how much resistance has changed over time.
Power supply
This value is the calculated power supply voltage of the electrical loop (in volts) measured
during the characterize loop procedure. Changes in this value may occur due to degraded
performance of the power supply. You can compare baseline and previous baselines to see
how much the power supply has changed over time.
Characterize loop
You must initiate loop characterization after installing the transmitter for the first time or
after intentionally altering electrical loop characteristics.
Examples include:
• Modifying power supply level or loop resistance of the system
• Changing the terminal block on the transmitter
• Adding the Wireless THUM
34
Adapter to the transmitter
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communication or the ability to
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Rosemount 3051
Manual