9
2.2
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. While Gas Check 5000is operation does
not depend on the RTC it has been tested for
compliance with Y2K.
