Ion Science GasCheck IS - Manual (Page 8)

GASCHECK 5000IS MANUAL Ion Science Ltd
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Technical Data
Performance
Detector type
Dual micro-volume thermal conductivity cell
Gases Detected:
All gases and vapours having a different thermal conductivity to the ambient air on which it was zeroed. The
larger the difference the greater the sensitivity, so that Gas Check is not highly sensitive to the gases
normally found in large concentrations in the ambient air, e.g. N2 (nitrogen) and O2 (oxygen).
For ease of use the Gas Check groups gases having similar thermal conductivity into one of the 5 gas
groups shown in Table 1. Each group has a calibration curve stored in memory. Although the Gas Check will
detect ALL gases with a different thermal conductivity to air, Table 1 lists those 12 common tracer gases that
have been tested and assigned gas groups. If the gas or gas mixture that you seek is not included in these
groups, select group 0 (which is the most sensitive). The Gas Check will then still find leaks quickly even
though the measured values will not be displayed accurately. Some gases give a negative response.
Minimum response time
Short probe fitted Less than 1 second
Long probe fitted About 9 seconds
Recovery time
About 1 second
Maximum detection level with the
short probe and nozzle fitted
20 ml/sec
Data logging RTC
This is a nominal device for convenience and can be reset
by a user if more accurate timings are required.
Note: If the probe has been changed then the instrument should be recalibrated for more accurate
measurements. The readings given by the long probe can only be considered as indicative.