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b. The inhibit (Ihb) and Sensor Self Test (SST) indicator flags appear in the display.
3. After successfully measuring a concentration of 10%FS or more, the instrument turns
off the gas generator and enters a recovery period while maintaining the inhibit state.
This state is maintained until the measured concentration drops to 5%FS or below (It
typically takes 2 to 3 minutes for the test to be completed.) The “
SST
” and “
Ihb
”
indicator flags will disappear.
4. If the sensor output fails to rise to 10%FS or more, the display will indicate “F02” and
the output will drop to the fault level of 3.1ma. In addition the
SST
flag will begin to
flash. For 10 seconds the output will remain at 3.1mA and then return to normal run
mode for 50 seconds. It will cycle like this until a successful test is run, or until the
SST
control is set to
OFF
, or until power is switched off and back to on. Until one of these
scenarios occurs the SST will retry the test once every hour for four hours. Afterwards it
will repeat the test once every eight hours.
Figure 18 Sensor Self Test Generator
Freedom 5000 Universal Analog Toxic Gas Detector
Instruction Manual