LumaSense Technologies 3434i SF6 Leak Detector - Manual (Page 145)

Chapter 12
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BE6028-14 3434i SF6 Leak Detector LumaSense Technologies A/S
Page 145 of 191
meter or similar apparatus; and the tube attached to point 3 is at-
tached to the cylinder of gas which is to be used during calibration.
Fig.12.4 General equipment required for a calibration task
Attaching a gas flow meter serves two vital functions (see Fig.12.5):
Fig.12.5 Schematic diagram of a flow meter
· It allows you to have a visually check that there is a net flow of
gas out of the Teflon tube attached to it during the whole
calibration procedure. The “flow ball” can be seen to be bouncing
on the upward flow of air out of the meter.
If the pressure of the gas from the cylinder is too low at any time
then the “flow ball” will just remain seated at the bottom of its