9 | Operating the Instrument
INFICON
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Sensistor_Sentrac_Strix_Operating_Manual_ninb65en1-01-(2010)
Default unit in Measuring Mode is cc/s. To set it to other units click Settings >
Measuring Mode.
The period during which the measured value is displayed can be adjusted in the
Measuring Mode Settings menu. Click Settings > Measuring Mode.
The Hydrogen Leak Detector operates in the range 0.1 - 1000 ppm H
2
. To obtain
greatest accuracy over this range, follow the calibration recommendation. See
Calibration.
9.3.4 Measuring Leaks
1. Move the probe around and over the product, to locate the exact spot where the
leak might be (signal will increase as probe approaches the leak).
2. Move the probe around 200 mm (8 in.) from the measurement point.
3. Make sure the instrument indicates 0. If not, wait until it does.
4. Move the probe as close as possible to the leak.
5. Hold it there until the measured value stabilizes. This takes approximately 1-2 s.
6. Remove the probe from the measuring point when the measured value stabilizes
and remains on the display and read the measured value.
7. Continue to the next measuring point and repeat the procedure.
NOTICE
The instrument is not an absolute gage, it measures relative to the
background.
Therefore, the probe must first be some distance from the leak and then moved
towards the leak for accurate measurement.
9.4 Hands On
It is important to have a correct calibration when measuring the size of a leak in
Measuring Mode and Combined Mode. Calibrate the probe before measuring, see
Calibration.
Ensure that the test object is pressurized properly before performing a test.
Parameters such as leak sizes, leak units and sensitivity can easily be set in the
instrument.
1. Turn the instrument on. The instrument starts up and the blue LED light, on the
right of the display, should be flashing slowly during warm-up phase. When the
instrument is ready to use the blue LED shines with a fixed, steady light.
