Ion Science GasCheck IS - Manual (Page 32)

GASCHECK 5000IS MANUAL Ion Science Ltd
Page 32 of 40 Unrivalled Detection. www.ionscience.com
Program
Move the end of the probe (or nozzle) around the area of a suspected leak and look at the display (or listen
to the audible clicks or note the visual LED flash rate on the Gas Check) to identify the location of a leak.
Specific procedures for leak detection along seams and around pipe joints are described in the following
sections.
When required:
Use the peak hold and Auto-Ranging modes to continue to check for leaks, but to display the largest leak
detected
If you want to zero the Gas Check, move the end of the probe (or nozzle) away from any possible leak, into a
clean air zone, then press the manual zero key.
Note that leak sensitivity depends on the ambient conditions. If you want to accurately measure a leak,
compare the indicated leak with a calibration standard, such as a portable reference leak.
When the Gas Check indicates that a leak has been found, move the probe (or nozzle) back to determine
the precise location of the leak. The leak is located where the largest leak size is indicated on the display
and where highest frequency clicks and visual flashing rate are emitted by the Gas Check, on the current
range.
Leak detection along seams
Move the end of the Gas Check probe (or nozzle) along the length of the seam, so that it just rests on the
seam. The speed at which you move along the seam depends upon the size of the leak that you search for:
If the leak is large, you can move fairly fast along the seam, at approximately 25 mm per second.
If the leak is small, move slowly along the seam, at approximately 10 mm per second.
Leak detection at pipe joints
Use the same procedure as for leak detection along seams, however move the probe (or nozzle) around the
joint at approximately half the speed. 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.
Data logging – interruption for menu access
Gas Check 5000is settings are protected during data logging. Press the INFO key to enter a menu dialogue.
Switch off the Gas Check
When the Gas Check 5000is has been left for a few seconds without any key press, then press the I/O key.
The Gas Check will ignore I/O presses during the instrument power up sequence and during any zeroing.
Auto Shut Down
The unit will auto shut down after approximately 10 minutes (if the keys have not been pressed and the
signal has been less than half full scale of the range selected)