Emerson ATEX Guía de instalación descargar pdf (Pagina 12)

Quick Installation Guide

00825-0100-4825, Rev DB

February 2011

Rosemount 248

STEP 5: PERFORM A LOOP TEST

The Loop Test command verifies transmitter output, loop integrity, and operation of any

recorders or similar devices installed in the loop.

NOTE:

This is not available with the 248C Configuration Interface.

Initiate a loop test:

1. Connect an external ampere meter in series with the transmitter loop (so the power to

the transmitter goes through the meter at some point in the loop.

2. From the home screen select 1) Device Setup, 2) Diag/Serv, 1) Test Device, 1) Loop

Test.

3. Select a discrete milliampere level for the transmitter to output. At Choose Analog

Output select 1) 4mA, 2) 20mA or select 3) Other to manually input a value between 4

and 20 milliamperes. Select Enter to show the fixed output. Select OK.

4. In the test loop, check that the fixed mA input and the transmitter’s mA output are the

same value. If the readings do not match, either the transmitter requires an output trim or

the current meter is malfunctioning.

After completing the test, the display returns to the loop test screen and allows the user to

choose another output value. To end the Loop Test, Select 5) End and Enter.

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Emerson ATEX Guía de instalación Pagina 12