Detcon CXT-IR - Manual (Page 27)

Model CXT-IR
From the View Sensor Status text scroll, hold the magnet over PGM1 or PGM2 until the arrow prompt
appears and continue to hold the magnet in place for an additional 3 to 4 seconds (until the display starts to
scroll Status Is). The display will scroll the complete list of sensor status parameters sequentially.
When the status list sequence is complete, the ITM will revert to the View Sensor Status text scroll.
The user can either:
a) review list again by executing another 3 to 4 second hold,
b) move to another menu item by executing a momentary hold over PGM1 or PGM2, or
c) return to normal operation via automatic timeout of about 15 seconds (the display will scroll View
Sensor Status four times and then return to normal operation).
3.4.2 Set Gas Type
The IR sensor has a slightly different linearization requirement for different groupings of target gases.
The two selections are:
• %LEL and
• %VOL.
The Set Gas Type menu function is a simple choice between these two gas type groupings.
NOTE The default value for Gas Type is methane (%LEL).
The menu item appears as: Set Gas Type.
From the Set Gas Type and Range text scroll, hold the magnet over PGM1 or PGM2 until the arrow prompt
appears and continue to hold the magnet in place for an additional 3 to 4 seconds (until the display starts to
scroll %LEL / %VOL). Swipe the magnet momentarily over PGM2 or PGM1 to change the selection until
the correct choice is displayed. Hold the magnet over PGM1 or PGM2 for 3 seconds to accept the new value.
The display will scroll Type Saved, then Set Range followed by the currently selected Range. Momentarily
hold the magnet over PGM1 or PGM2 to change the Range Selection until the correct value is displayed.
Hold the magnet over PGM2 for 3 seconds to accept the new value.
Move to another menu item by executing a momentary hold, or, return to normal operation via automatic
timeout of about 15 seconds (the display will scroll Set Gas Type 4 times and then return to normal
operation).
3.4.3 Set AutoSpan Level
Set AutoSpan Level is used to set the span gas concentration level that is being used to calibrate the sensor.
This level is adjustable from 5% to 95% of range. The current setting can be viewed in View Program Status.
The menu item appears as: Set AutoSpan Level.
From the Set AutoSpan Level text scroll, hold the magnet over PGM1 or PGM2 until the arrow prompt
appears and continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll
Set Level). The display will switch to XX (where XX is the current gas level). Swipe the magnet momentarily
over PGM2 to increase or PGM1 to decrease the AutoSpan Level until the correct level is displayed. When
the correct level is achieved, hold the magnet over PGM2 for 3 to 4 seconds to accept the new value. The
display will scroll Level Saved, and revert to Set AutoSpan Level text scroll.
Move to another menu item by executing a momentary hold, or return to normal operation via automatic
timeout of about 15 seconds (the display will scroll Set AutoSpan Level 4 times and then return to normal
operation).
CXT-IR Instruction Manual Rev. 1.6 Page 23 of 44