Detcon CX-IR - Manual (Page 20)

Model CX-IR
NOTE
The "
◄" prompt will show that the magnetic switch is activated during the 3 second hold
period.
c) The display will scroll ‘PGM1=Zero PGM2=Span’. Hold the programming magnet over PGM2 for 3
seconds to execute AutoSpan (or allow to timeout in 5 seconds if AutoSpan is not intended). The ITM
will scroll ‘Apply XX % Gas’.
d) Apply the span calibration test gas for combustible gas sensors at a flow rate of 200-500cc/min (500cc/min
is the recommended flow rate). As the sensor signal begins to increase the display will switch to flashing
XX
reading as the ITM shows the sensorꞌs as found response to the span gas presented. If it fails to meet
the minimum in-range signal change criteria within 2 minutes, the display will report Range Fault twice
and the ITM will return to normal operation, aborting the AutoSpan sequence. The ITM will continue to
report a Range Fault until a successful calibration is completed.
e) Assuming acceptable sensor signal change, after 1 minute the reading will auto-adjust to the programmed
AutoSpan level. The ITM then reports the following messages: ‘Remove Gas’.
f) Remove the span gas source and calibration adapter. The ITM will report a live reading as it clears toward
0. When the reading clears below 10% of range, the ITM will display ‘Span Complete’ and will revert to
normal operation. If the sensor fails to clear to less than 10% in less than 5 minutes, a ‘Clearing Fault’
will be reported twice and the ITM will return to normal operation, aborting the AutoSpan sequence. The
ITM will continue to report a Clearing Fault until a successful calibration is completed.
g) AutoSpan calibration is complete.
NOTE
If the sensor fails the minimum signal change criteria, a Range Fault will be declared and
the Range Fault bit will be set on the Modbus™ output.
NOTE
If the sensor fails the clearing time criteria, a Clearing Fault will be declared and the
Clearing fault bit will be set on the Modbus™ output.
3.4 Program Mode
Program Mode provides menus to check and set operational and configuration parameters of the sensor.
Program Mode provides for adjustment of the AutoSpan Level, Gas Factor, Gas Type and Range, and Serial
ID. Program mode includes the diagnostic function bump test and restores defaults.
The Program Mode menu items appear in the order presented below:
View Sensor Status
Set Gas Type
Set AutoSpan Level
Set Gas Factor
Bump Test
Set Modbus™ ID
Restore Defaults
Navigating Program Mode
From normal operation, enter program mode by holding the magnet over PGM2 for 3 seconds. The "
►"
prompt will verify that the magnetic switch is activated. If the sensor is experiencing a fault condition the "
►"
prompt will not appear until the fault(s) have been displayed.
CX-IR Instruction Manual Rev. 1.2 Page 16 of 34