INFICON Extrima Ex-certified Hydrogen Leak Detector - Manual (Page 33)

33
EN
INFICON - Operating Instructions EXTRIMA
To Quantify Leaks
The Analysis Mode is used for measuring
the size of a leak (or the concentration of
a gas sample).
To be able to do this measurement and
obtain correct values, the instrument
must first be calibrated using the calibra-
tion function. See the following page and
”Calibration” on p. 34.
In the Analysis Mode the detector de-
termines the gas concentration from the
change, as the probe goes from being
exposed to background to being exposed
to a certain gas concentration. The detec-
tor does not continuously monitor the gas
concentration but takes just one reading
instead, a sample. It is important to keep
this in mind when using the detector in
this mode.
In Analysis Mode the probe should be
moved directly from a background situa-
tion to the test point. The size of the leak
in PPM, or any other selected units*, is
shown on the display. The probe can and
should be removed from the measuring
point as the measured value remains on
the display.
Leak Alarm Level
Leak Alarm Level is set in decimal or
scientific format. The scientific format
is explained by the following example:
2.4 x 10 –2 = 0.024
can be written:
2.4E–0.2 or 0.024
The Extrima detector operates in the
range 0 - 2000 ppm giving reasonable
linearity between 0 and 500 ppm. To
obtain greatest accuracy over this range,
calibrate the detector at a concentration
somewhere between 10 and 100 ppm.
Generally accuracy is always best near the
concentration at which it was calibrated.
*Leak Rate Unit is selected in the Analysis Mode Settings menu, ”Analysis Mode Set-
tings” on p. 25 and ”Leak Rate Unit and Calibration Coefficient” on p. 35.
The period during which the measured
value is displayed can be adjusted in the
submenu Min Presentation Time of the
Analysis Mode Settings menu. See ”Ana-
lysis Mode Settings” on p. 25.
– Volume + Menu
Analysis Mode
0.5
PPM
To switch between Detection Mode
and Analysis Mode simply press the
right hand button three times.
If entered incorrectly the previous value
will be retained. Always check that the
correct value is saved.
The unit used is the current Leak Rate
Unit. See ”Leak Rate Unit” on p. 26
and ”Leak Rate Unit and Calibration Coef-
ficient” on p. 35.