Gas Sampling; Maintenance, Calibration; And Gas Testing - Linde G-TECTA 4G Operating Manual

12

Gas Sampling

To take a sample of a gas in a confined space or
where there are unknown levels of gas present
using G-TECTA 4G, the flow sample method can be
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used. A flow cap must be fitted over the sensors
on the front of the instrument and a hose and an
aspirator bulb fitted onto the flow cap nozzles.
Note: A flow cap and a 2 metre length of hose are
included in the box with your G-TECTA
The aspirator bulb and hose (Article Number ASGTAK2
or ASGTAK3) is an additional accessory.
1. To fit the flow cap, clip the flow cap over the
sensor grills on the front of the instrument and
screw the thumbscrew until it is tightly fitted
into place.
2. Attach the sampling hose onto the gas in nozzle.
3. Attach the aspirator bulb onto the gas
out nozzle.
4. Check the aspirator bulb is attached correctly
by covering the end of the bulb and by
squeezing it gently. If there are no leaks, the
aspirator bulb should remain deflated for a
few seconds.
5. Squeeze the aspirator bulb once per second to
create a steady flow of air into the instrument.
We recommend the operator squeezes the
aspirator bulb at least 10 times (using the
2 metre hose supplied). Longer lengths of
hose and metal probes can be purchased. For
additional lengths of hose, we recommend
that the aspirator bulb is squeezed once for
every 30cm of hose to enable the gas sample
to reach the sensor. Continue to squeeze the
bulb for an additional 45 seconds, or until gas
readings stabilise.
6. To remove the flow cap, unscrew
Gas in
4G instrument.
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
only provides continuous gas readings for the area
in which the hose or probe is located and when the
aspirator bulb is being continuously squeezed. Each
time a new gas reading is required, the aspirator bulb
must be squeezed a sufficient number of times to bring
a fresh sample and a stabilised reading to the sensor.

Maintenance, Calibration

and Gas Testing

Cleaning
Ensure the G-TECTA
and sensor filter remain free from dirt build up.
Regularly wipe over your G-TECTA
with a damp cloth and inspect the sensor filters for
dirt or damage.
Gas (bump) Testing
The atmosphere in which G-TECTA
are used can have lasting effects on the sensors.
Sensors may suffer losses in sensitivity leading to
degraded performance if exposed to certain substances.
the thumbscrew and lift it away from
the instrument.
WARNING
Manual aspirator remote sampling
4G display, operator button
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Gas out
4G instrument
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4G instruments
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