Emerson 3051S Specifikace stáhnout pdf (Strana 137)

Reference Manual

00809-0100-4801, Rev FA

October 2010

7-33

Rosemount 3051S Series

Figure 7-26. Device Diagnostics

screen

mA Output Diagnostic The mA Output Diagnostic measures the actual 4 – 20 mA output from the

transmitter’s Digital-to-Analog converter and compares it against the output

by the transmitter’s microprocessor. If the measured value deviates from the

expected value by 2% or more, the diagnostic will generate an alarm or alert.

NOTE

The default trip action for mA Output Diagnostic is set to Alarm. For use in

SIS, the trip action must not be changed or the proper safety coverage stated

on the FMEDA will not be realized.

Transmitter Power

Consumption

Transmitter Power Consumption diagnostic monitors for excessive current

draw by the transmitter. This diagnostic is used to detect a potential on-scale

failure due to current leakage or failing electronics.

NOTE

If trip action is set to Alarm, the transmitter will drive the 4 – 20 mA output to

fail HIGH regardless of the alarm direction configured by the alarm switch.

SMART WIRELESS

THUM ADAPTER

CONFIGURATION

Overview Many older legacy control systems that only use analog can not take full

advantage of HART diagnostics or additional process variables. The Smart

Wireless THUM Adapter can transmit up to four process variables and

additional HART status information at the user configurable update rate. The

selectable process variables are Pressure, Module Temperature, Scaled

Variable, Standard Deviation, Mean, and Coefficient of Variation.

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Emerson 3051S Specifikace Strana 137