15
Note:
You can abort the calibration test by
pressing the mode button at any time whilst
the test is in progress.
7. The G-TECTA
®
4GP instrument will adjust the
value on the gas sensor to match the stored
calibration gas value within the sensor module.
8. G-TECTA
®
4GP will display a “
3
” or “x” against
each sensor to indicate PASS or FAIL.
9. If any of the G-TECTA
®
4GP sensors do not
calibrate successfully, the gas type will remain
marked with a “x” and the warning messages
“Gas Test Failed” and “Send for Calibration” will
be displayed. The G-TECTA
®
4GP must be sent to
a Linde Group Authorised Service centre for re-
calibrating or sensor replacement.
Note:
Gas Test pass and fail, and calibration
pass, fail and values are stored in the Event log.
Note:
Some sensors may not be calibration enabled.
Oxygen sensors are by default not calibration
enabled as they are calibrated in fresh air by zeroing.
WARNING
One button calibration will
check for small drifts of stored calibration value.
The Linde Group recommends G-TECTA
®
4GP is sent
for full certified calibration at six monthly intervals.
G-TECTA 4GP Instrument with
Ozone (O
3
) Sensor
Due to the reactive nature of ozone (O
3
) special
procedures should be followed when calibrating gas
detectors that incorporate an ozone sensor.
Fittings
For ozone calibrations all fittings and pipe work
should be stainless steel, brass, aluminium or PTFE.
Fittings or pipe work in other plastic materials such
as Tygon must not be used.
Gas flow rate
It is important that the flow rate is set correctly as
otherwise pressure effects may distort calibration
values and prevent the gas detector from working
correctly. To calibrate, the flow rate should be set
between 0.8-1.0 litres/minute (0.03-0.04 cubic
feet/minute)
Normal safety precautions for handling ozone
should always be observed along with any special
instructions that accompany the calibration gas
cylinder or generator being used.
For calibrating the ozone sensor, the special flow
cap assembly with four inlets (article number
AS4GP3021) must be used. The Ozone sensor must
always be at position 3, as marked on the flow cap.
Note:
The standard flow cap assembly supplied with
the instrument must be used for calibrating the other
gas sensors
* G-TECTA
®
PC Software can be downloaded free of charge from
www.g‑tecta.com
