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Calibration
Over view
The GasCheck Tesla has two selectable calibration settings;
Factory and Custom. 'Factory Calibration' is carried out at ION
Science Inc / Authorized Service Centers during the instruments
manufacture, it can be selected and used but can not be changed.
The GasCheck Tesla is calibrated against a 5000 ppm Helium
concentration and a 0.0005cc/sec (5 E-
'Custom Calibration' gives the user the ability to calibrate the
instrument, this facility may offer improved accuracy over the
'Factory Calibration' if the Barometric air pressure differs from
that stated on the instruments Calibration certificate.
Selecting Factory or Custom Calibration
'Custom Calibration' can only be selected and used after the instrument has been calibrated by the user, to do this move
the 'tick / check' under the 'Custom Cal' symbol and press the ENTER key.
The GasCheck Tesla requires either 5000 ppm Helium concentration or a 0.0005cc/sec (5 E
reference. The GasCheck Tesla automatically selects the type of Calibration media based on which units the instrument
already has selected.
If the GasCheck Tesla is used to detect leaks measured using 'ppm or mg/m
calibrated using a 5000 ppm Helium concentration.
If the GasCheck Tesla is used to detect leaks measured using 'cc/sec' units then the instrument must be calibrated using
-4
a 0.0005 cc/sec (5 E
) Helium leak.
Calibration procedure using 'ppm' units
Please read this entire procedure before proceeding with this calibration routine.
Unrivaled
Detection.
4
) Helium leak rate.
To select either Factory or Custom Calibration select the Calibration
screen and user the UP and DOWN keys to move the 'tick / check'
under the desired symbol, then Press the 'Esc' key to exit into the main
menu.
* Fill an empty (uncontaminated) sample bag with 5000 ppm Helium gas before starting the
calibration procedure. Also remove the outer grey probe from the GasCheck Tesla.
* Select the 'Custom Cal' symbol from the instruments menu. An option appears allowing the
adjustment of the 'ppm' value to ensure the instrument matches the gas concentration being
used. Use the UP and DOWN keys to adjust between 4900 and 5100 ppm.
* Ensure the instrument is in clean air and then press the ENTER key, the instrument will Zero,
this will take a few seconds but once complete a 'Ready' message will appear.
* Insert the instruments
ENTER key. The instrument will automatically sequence through the cold and hot stages of
calibration but when finished gives a summary of values.
* Press the ENTER key to return back to the calibration option screen. Press the ESC key to
start using the instrument or press the ENTER key to calibrate again.
NOTE:
To avoid errors in calibration the following points should be noted:-
- Avoid bending the inner probe as this will affect the GasCheck Tesla 's accuracy.
- GasCheck Tesla can detect changes in Humidity and Carbon dioxide, therefore avoid
breathing on the probe.
- Avoid pressurizing the sample bag as this will cause significant errors in reading
GasCheck Tesla Instrument User Manual V1.2R
fully into the sample bag containing the gas and press the
probe
Page 19 of 26
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cc/sec) leak rate as a
3
' units then the instrument must be
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