LACO USER MANUAL - GASCHECK G SERIES
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© 2018 FLUIDX Equipment, Inc.
5. MAINTENANCE
5.1
CALIBRATION
The GasCheck G Series has two selectable calibration settings: factory
and custom. Factory calibration is carried out at Ion Science during the
instrument’s manufacture. It can be selected and used but cannot be
changed.
The GasCheck is calibrated against a 5000 ppm helium concentration and a
0.0005cc/sec (5 E-4) helium leak rate.
Custom calibration gives the user the ability to calibrate the instrument.
This setting may offer improved accuracy over the factory calibration if
the barometric air pressure differs from that stated on the instrument’s
calibration certificate.
5.1.1 SELECTING FACTORY OR CUSTOM CALIBRATION
To select either FACTORY CAL or CUSTOM CAL, select the calibration screen
and move the up use the up and down keys to move the “tick” under the
desired symbol, then press the ESC key to exit to the main menu.
Custom calibration can only be selected and used after the instrument has
been calibrated by the user. To do this, move the “tick” under the CUSTOM
CAL symbol and press the ENTER key.
The GasCheck requires either 5000 ppm helium concentration or a
0.0005cc/sec (5 E-4 cc/sec) leak rate as a reference. The GasCheck
automatically selects the type of calibration media based on which unit
the instrument has already selected.
If the GasCheck is used to detect leaks measured using “ppm or mg/m3”
units, then the instrument must be calibrated using a 5000 ppm helium
concentration.
If the GasCheck G is used to detect leaks measured using “cc/sec” unites,
the instrument must be calibrated using a 0.005 cc/sec (5 E-4) helium leak.
5.1.2 CALIBRATION PROCEDURE USING PPM UNITS
Please read this entire procedure before proceeding with this calibration
routine.
1. Fill an empty (uncontaminated) sample bag with 5000 ppm helium gas
before starting the calibration procedure. Also remove the outer gray
probe from the GasCheck.
2. Select the CUSTOM CAL symbol from the instrument’s 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.
