Vega MINITRAC 31 4 … 20 mA_HART - four-wire Bedienungsanleitung PDF herunterladen (Seite 32)

6 Set up with the display and adjustment module

MINITRAC 31 • 4 … 20 mA/HART - four-wire

40447-EN-131119

Select "Determine count rate"toentertherstpoint.

The determination of the actual count rate lasts 2 minutes. After the

count rate has been determined, you can accept the value (ct/s).

Enter now the corresponding level (m).

By doing so, you assign a respective level to the actual count rate.

Accept the value pair with "OK".

Depending if you have started with full or empty vessel, you have to

continueemptyingorllingthevessel.

Alsocarryoutsuchalinearizationwithseveraldierentllingheights

if you have a linear vessel.

A maximum of 32 linearisation points is possible.

In this menu item you can adjust the damping of the sensor. With

ityoucansuppressuctuationsinthemeasuredvalueindication,

caused e.g. by an agitated product surface. This time can be between

1 and 1200 seconds. Keep in mind that the reaction time also in-

creases and the instrument reacts to quick level changes with a delay.

Generallyatimeofapproximately60secondsissucienttosmooth

the measured value indication.

Radiationfromexternalsourcescaninuencethemeasuringresultof

the sensor.

Possible external radiation sources can be, for example, a weld joint

test on a neighbouring facility or other radiation-based instruments.

An X-ray alarm is triggered if the impulses (ct/s) are more than 25 %

abovethemax.valuefromthelinearizationtable.

This fault message is only outputted for the period of the increased

X-ray radiation. Then the fault message is automatically reset.

In this menu item you can determine the behaviour of the sensor

when external radiation sources appear.

In this menu item you can activate the relay output and determine its

function as well as the switching points.

When the output of the process values is set, you can choose be-

tweenoverllanddryrunprotection.

The relay outputs of the sensor react accordingly.

You can choose "no" reference value. In this case, the relay output

operates as fail safe relay.

Caution:

Independentoftheselectedreferencevalue,therelaywilldeenergize

in case of failure.

Setup - Damping

Setup - External radiation

alarm

Setup - Relay

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