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Page 166

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Chapter 12

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BE6028-14

3434i SF6 Leak Detector

LumaSense Technologies A/S

Page 166 of 191

running there is a positive flow of gas out of the flow meter.

This will ensure that the calibration gas is not diluted by

atmospheric air.

The following text appears on the screen:

RESULTS NOT YET AVAILABLE

PLEASE WAIT

Once the first measurement result is available the screen text

illustrated above is replaced by a screen displaying the

measurement results – for example the following:

W : µ : 5.34 µV σ : 212 nV 3 40.4 °C

PRESS ENTER WHEN RESULTS ARE STABLE

As soon as measurement results are available, they not only

appear on the display (see

Fig.12.11

) but are automatically

printed out on the printer, if the Monitor has been set up to print

a data log, see

section 10.5

. Remember to turn off the data log

when the calibration is complete.

Each time a sample of gas is drawn into the analysis cell the

signal is measured using both optical filter “A” and the water-

vapour filter (“W”) but, due to lack of space on the display, the

Monitor only displays the signal measured using the water-vapour

filter. The data-log print-out, however, shows the signal measured

using both the water-vapour filter and filter “A”.

A maximum of 6 measurements are stored in the Monitor during

any calibration. The number (n) indicates how many

measurements are stored. When 7 measurements have been

performed the number (n) will show the number 6 because the

very first measurement is overwritten by the 7

measurement so

that only 6 measurements are still stored. When 8 measurements

have been completed the number (n) will also show 6 because the

results of the first and second measurements have been

overwritten by the 7

and 8

measurement results …and so on.

2. Let the Monitor continue measuring the span gas A until the

temperature is stable. Look at the print-put of the average and

standard deviation measurements for (1) the water-vapour and

(2) the filter “A”. When these values have stabilised for both

filters, span calibration measurements do not need to continue.

3. Press

This causes the following text to appear on the screen:

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