Stratos-HSSD 2 troubleshooter


Select the type of fault.


Select the symptom.

Detector fault


Inspect the ribbon cable from the detector head to CN9, the detector head connector, on the main detector Printed Circuit Board (PCB) and ensure that is connected and undamaged.

Check the detector output using detector continuous read. The detector output should be approximately 5% in clean air. If the head output has dropped to a very low level the detector head will need to be replaced (part number 30698).

If the detector fault is generated by a process error (this will be shown in the event log) then the code displayed following the process error message in the event log specifies the type of fault as shown below.
  1. Cannot set suitable alarm factor for FastLearn
  2. Histogram sum too high
  3. Bad alarm level
  4. Histogram sum too low
  5. Bad sensitivity
  6. Internal command module error
  7. Bad device fault status
  8. Bad input function
Process error 0 is caused by very high levels of background smoke during a FastLearn.

Process errors 1, 2, 3 and 4 are generated by internal checks on the data structures used by ClassiFire. These structures are critical to the correct operation of the unit. If one of these process errors occurs (as may happen with high levels of EMC or watchdog resets) then performing a FastLearn will reinitialize these data structures and resume correct operation.

Process errors 5, 6 and 7 are internal checks on the software operation and should never occur. If you see one of these process errors in an event log contact AirSense Technology with details of the detector software revision and settings for a software upgrade.

Flow fault


Flow low


Check that the aspirator fan is running and that the fan connector is connected to CN5, the aspirator fan connector, on the main detector PCB. Ensure that the sampling pipe(s) are not blocked. Ensure that a return pipe is used for the exhaust air if the unit is sampling from an area of different air pressure.

Flow high


Check that the sampling pipe is not broken. Ensure that a return pipe is used for the exhaust air if the unit is sampling from an area of different air pressure.


Flow sensor fail


Confirm that the flow sensor PCB is connected to CN6, the flow sensor connector, on the main detector PCB. The flow sensor fault is generated when no signals are received from the flow sensor. If the flow sensor fail continues then replace the flow sensor PCB (part number 30695).

Mains or battery fault


Mains and battery monitoring use the remote inputs on the Stratos-HSSD 2. Check that a volt free normally closed relay contact is connected to the remote input and that the correct input is selected in the programmer. Check that the relay contact is closed by disconnecting the remote input temporarily and using a multimeter to measure continuity.

Dust separator fault


If the detector is displaying 'Separator renew' then the dust separator cartridge is contaminated and needs to be renewed (part number 30699). It is not possible to clean a contaminated dust separator.

If the detector is displaying 'Separator change' then the dust separator cartridge has been removed or the separator monitor cable has been disconnected from CN7 on the detector main PCB.

Reset button not working


The Reset button is disabled by default. Enter the programmer on the detector and set 'Reset enable' to 'Yes' in Setup\Front Panel\Reset'.

Isolate button not working


The Isolate button is disabled by default. Enter the programmer on the detector and set 'Isolate enable' to 'Yes' in Setup\Front Panel\Isolate'.


©AirSense Technology Ltd 2008