Emerson 3051S Spezifikationen PDF herunterladen (Seite 127)

Reference Manual

00809-0100-4801, Rev FA

October 2010

7-23

Rosemount 3051S Series

Resistance

This value is the calculated resistance of the electrical loop (in Ohms)

measured during the Characterize Loop procedure. Changes in the

resistance may occur due to changes in the physical condition of the loop

installation. Baseline and Previous Baselines can be compared 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. Baseline

and Previous Baselines can be compared to see how much the power supply

has changed over time.

Characterization Time Stamp

This is the time stamp or elapsed time of the loop characterization event. All

time values are non-volatile and displayed in the following format:

YY:DDD:hh:mm:ss (years:days:hours:minutes:seconds).

Characterize Loop

Loop characterization must be initiated when the transmitter is first installed or

when electrical loop characteristics have been intentionally altered. Examples

include more transmitters being added onto the loop, modified power supply

level or loop resistance of the system, changing the terminal block on the

transmitter, or adding the Smart Wireless THUM to the transmitter. Another

case of required re-characterization is if the diagnostic electronics is taken out

of an existing 3051S transmitter and placed in a new 3051S installed on a

different loop.

NOTE

Power Advisory diagnostic is not recommended for transmitters operating in

HART Burst Mode (fixed current mode) or multidrop.

Severe changes in the electrical loop may inhibit HART communication or the ability to

reach alarm values. Therefore, Rosemount 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.

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Emerson 3051S Spezifikationen Seite 127