Vega MINITRAC 31 Profibus PA Bedienungsanleitung PDF herunterladen (Seite 43)

6 Set up with the display and adjustment module

MINITRAC 31 • Probus PA

43836-EN-131119

values are not suitable for your application and must be replaced by

real values. Delete this value pair in the following procedure and carry

out the linearization.

Due to the measuring principle, there is no linear relationship between

pulse rate and density. Hence, this adjustment (i.e. linearization) must

be carried out in any event.

Carry out this adjustment with several points to increase the accuracy

of the measurement.

Note:

Water has as a known density value of 1 g/cm

. Carry out the adjust-

ment with water, if possible.

•

Prerequisites:

Radiation is switched on - Source container is set to "ON"

The tube is completely lled. Possible gas bubbles or air inclusions

can inuence the measurement.

The MINITRAC 31 sorts the points automatically according to their

density.

Select "Show table" to display and edit the linearization points.

Select "Linearization - New" to enter the rst point.

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

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

count rate was determined, you can accept the value.

The count rate is stated in ct/s. This is the number of counts per sec-

ond, i.e. the measured radioactive radiation dose actually reaching

the sensor.

Enter now the corresponding density value (g/cm

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Vega MINITRAC 31 Profibus PA Bedienungsanleitung Seite 43