All relevant Ax60+ document information can be found on the Analox Sensor Technology Website, take a look at the Ax60+ product page.


There are two potential reasons for the Ax60+ to show a FLT16 code on screen, these are:

  1. The sensor unit requires zero and span calibration adjustment (see the service manual for guidance on carrying out this process)
  2. The CO2 sensor alarm directions have been incorrectly set. 


If your unit is displaying a Flt16, first attempt a zero and span calibration adjustment then power cycle the device. If this is not possible or the issue is not resolved, check to see if it has been correctly configured as detailed below.


The Ax60+ is primarily a breathing air device, as such, the CO2 sensor unit alarms are restricted to only trigger in the 'high-going' direction. If a user changes the alarm 'going' to 'low-going' a FLT16 will ensue. 


To clear this fault the following steps should be followed (be aware that only a short period of non-alarm time is available so you'll need to be quick!!):

  1. Power cycle the Ax60+ (turn it off and on again)
  2. Wait for the sensors display on the screen
  3. Press the Accept/Test button briefly to silence any alarms
  4. Press and hold the top two buttons (Cancel and cycle) until the top level menu is reached.
  5. Press the cycle button six times (until sensor config is shown)
  6. Press the Accept/Test button
  7. Press the cycle button twice (Alarm direction is shown)
  8. Press the Accept/Test button
  9. Select the sensor that had the alarm 'going' changed (press cycle to move the arrow selector over until the relevant sensor is identified and press the Accept/test button)
  10. Select the alarm that had the alarm 'going' changed (press cycle to move the arrow selector over until the relevant alarm is identified and press the Accept/test button) 
  11. Change the alarm direction to 'up' (press the cycle button until the arrow selector points at the up arrow and press the Accept/test button)
  12. Press the cancel button five times until the sensors display on screen
  13. Acknowledge any faults displayed
  14. Power cycle the unit