INFICON Extrima Ex-certified Hydrogen Leak Detector - Manual (Page 34)

34
EN
INFICON - Operating Instructions EXTRIMA
The instrument can be calibrated using
the integral calibration function, see
”Calibration” on p. 20. After calibra-
tion the instrument will show the cor-
rect measured values on the display in
Analysis Mode.
(The sensitivity settings made in Detec-
tion Mode are described in ”Sensitivity”
on p. 24)
Calibration is a natural part of leak
measurement and an important factor
in Quality Assurance. This is achieved by
using the integral calibration function
described in ”Calibrate” on p. 21.
It is impossible to specify an exact re-
quirement for the interval between
calibrations because the applications for
which the instrument is used can vary
considerably.
If the detector is used, but is not subjec-
ted to gas for a lengthy period or exposed
to very small gas concentrations (less than
10 ppm) with long intervals between ex-
posure, there will be some oxidation of
the sensor which reduces the sensitivity.
The oxidation is reduced when the in-
strument is subjected to large gas con-
centrations.
If the instrument is subjected to a very
large gas concentration over a long pe-
riod, a certain amount of insensitivity can
occur directly afterwards. This saturation
effect can make it difficult to detect very
small leaks. Therefore, make a habit of
removing the probe from the measuring
point as soon as the measured value is
displayed. This gives the detector an opp-
ortunity to recover. The measured value
remains on the display for the period
selected under Min Presentation Time in
the Analysis Mode Settings menu, see
”Min Presentation Time” on p. 26.
NOTE: The calibration is saved
in the probe even if it is discon-
nected.
If another probe is connected it
must be calibrated if this is not
done earlier, if it has not been
used for a while or if the refe-
rence is changed.
Password
To prevent settings for measurements
being changed inadvertently or by unaut-
horised persons, all critical settings can be
protected with a password.
When the display shows Enter Password
coupled with a flashing line, type in the
desired password using the + and – , and
press > twice after the last character.
To set password, see ”Change Password”
on p. 29.
If the display shows Wrong Password,
press Enter and type in the correct
password. Menus will be unlocked until
you return to Detection Mode/Analysis
Mode.
General settings
Change Password
< – + >
Enter Password
Calibration