35
5
MAINTENANCE
5.1
Inspect and clean the Gas Check
1.
Switch off the Gas Check.
2.
Refer to Figure 5. If the nozzle is fitted, hold the nozzle (1) by its wide base and gently twist and
pull it to remove it from the Gas Check.
3.
With the small end of the box spanner towards the Gas Check, guide the end of the probe (2 or
7) through the middle of the box spanner. Push the box spanner onto the nut (3) and turn the
box spanner anticlockwise to undo and remove the probe.
4.
Inspect the Gas Check. If the case of the Gas Check is cracked is cracked or dented, we
recommend that you do not continue maintenance, but return the Gas Check to your supplier for
inspection and calibration.
5.
Wipe the Gas Check with a clean, lint-free cloth moistened with a weak solution of detergent.
6.
Carefully wipe the outer faces of the probe/nozzle fitting to remove any small particles of dirt or
debris.
7.
Use a suitable tool to push any blockage out of the end of the nozzle, then wipe the outside of
and the inner face of the wide part of the nozzle.
8.
Inspect the probe:
·
The hole in the short probe is approximately 0.47mm (0.0185inches) in diameter. We
recommend that you push stiff wire of 0.25mm (0.01inches) diameter or less into the hole in
the probe to remove any blockage.
·
The long probe is too long to be effectively cleaned. If the probe is blocked, we recommend
that you obtain a new probe, available as a spare: refer to section 7.
9.
Refit the required probe to the Gas Check: refer to Steps 4 to 6 in Section 4.4.2.
10.
Place a light wipe of thin petroleum jelly around the inner face of the wide part of the nozzle,
then fit the nozzle to the Gas Check.
11.
Place the Gas Check and nozzle (and the long probe, if just removed) in its storage case. Store
the case in suitable conditions: refer to Section 6.1.
CAUTION
Do not clean the probe while it is attached to the Gas Check and do not try to clean the sample hole
inside the probe/nozzle fitting which leads to the detector. If you do, you can damage the Gas Check.
