GasCheck 3000 & 3000is Ion Science Ltd
Page
17 of 23
4.6.3
Leak detection at pipe joints
Use the same procedure as for leak detection along seams (see Section 4.6.2), however, move the probe (or
nozzle) around the joint at approximately half the speed specified in Section 4.6.2. Light gases (such as
hydrogen and helium) diffuse quickly into air, so an apparent leak on the side or top of a joint may actually
be a leak at the bottom of the joint.
4.7
Switch off the GasCheck
When the GasCheck 3000 has been left for a few seconds without any key press, then press the I/O key.
The GasCheck will ignore I/O presses during the instrument power up sequence and during any zeroing.
4.7.1
Auto Shut Off
If the GasCheck is left for a period of approximately 10 minutes without key presses it will shut itself off.
5
MAINTENANCE
5.1
Inspect and clean the GasCheck
1.
Switch off the GasCheck.
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 GasCheck.
3.
With the small end of the box spanner towards the GasCheck, guide the end of the probe (2 or 7)
through the middle of the supplied 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 GasCheck. If the case of the GasCheck is cracked or dented, we recommend that you do not
continue maintenance, but return the GasCheck to your supplier for inspection and calibration.
5.
Wipe the GasCheck 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, and 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 GasCheck: 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 GasCheck.
11.
Place the GasCheck 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 GasCheck 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
GasCheck.
