Model CXT-IR
CXT-IR Instruction Manual
Rev. 2.1
Page 20 of 48
Software Flowchart
dec
LEGEND:
PGM1 - Program Switch Location #1
PGM2 - Program Switch Location #2
(S) - Momentary Swipe
(M) - Momentary hold of Magnet during text
scroll until the ">" appears, then release
(3) - 3 second hold from ">" prompt
(10) - 10 second hold from ">" prompt
Auto Time-out - 5 seconds
inc - Increase
dec - Decrease
#, ##, ### - numeric values
Serial N. ##.##.##
Temperature ##C
RF Channel ##
AutoZero
PGM1 (3)
PGM2 (10)
PGM2 (3)
RF App ##.##.##
CP App ##.##
RF SW ##.##
Modbus ID ####
inc
Auto Time-Out
View Sensor Status
PGM1/2 (3)
PGM1/2 (M)
MP App ##.##
PGM2 (S)
PGM1/2 (3)
PGM1 (S)
##
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
AutoSpan
Normal Operation
PGM1 (3)
Auto Time-Out
Auto Time-Out
inc
PGM2 (S)
PGM1/2 (3)
PGM1 (S)
Type XX
PGM1/2 (3)
PGM1/2 (M)
dec
PGM1/2 (3)
PGM1/2 (M)
Set Gas Factor
PGM1/2 (M)
Defaults Restored
PGM1/2 (3)
Restore Defaults
Auto Time-Out
dec
inc
PGM2 (S)
PGM1/2 (3)
PGM1 (S)
##
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
Set RF Channel
Set Autospan Level
Network ID ##
Range ###
Last Cal ## Days
Sensor Life ###%
Set Gas Type
Auto Time-Out
PGM1/2 (3)
Bump Test Started
PGM1/2 (3)
PGM1/2 (M)
Bump Test
2 minute timeout
PGM2 (S)
PGM1/2 (3)
PGM1 (S)
##
inc
dec
Alarm 2
Alarm 1
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
Alarm Settings
inc
PGM2 (S)
PGM1/2 (3)
PGM1 (S)
##
Alarm 1 Level
Y/N
Alarm 1 Ascending
Y/N
Alarm 1 Latching
Y/N
Alarm 1 Energized
dec
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
inc
inc
inc
inc
PGM2 (S)
PGM1/2 (3)
PGM1 (S)
##
Alarm 2 Level
Y/N
Alarm 2 Ascending
Y/N
Alarm 2 Latching
Y/N
Alarm 2 Energized
dec
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
AutoTime-out
PGM1/2 (3)
PGM1/2 (M)
inc
inc
inc
Auto Time-Out
inc
PGM2 (S)
PGM1/2 (3)
PGM1 (S)
##
PGM1/2 (3)
PGM1/2 (M)
Set Modbus ID
dec
Figure 17 Menu Flow Chart
3.2
Normal Operation
In normal operation, the ITM Display will be blank and will display the gas reading once every 10 seconds for
about 2 seconds (normally appear as 0). At any time swiping a magnet across either
PGM1
or
PGM2
will cause
the ITM to display the units and gas type (i.e. % LEL or PPM H2S). If the sensor is actively experiencing any
diagnostic faults, a swipe of the magnet will cause the display to scroll the fault condition. Refer to Section 5
Service and Maintenance for more information on fault conditions.
3.3
Calibration Mode
Zero and span calibration should be performed on a routine basis (quarterly minimum is advised) to ensure
reliable performance. If a sensor has been exposed to any de-sensitizing gases, or to very high over-range
combustible gas levels, re-calibration should be considered. Unless otherwise specified, span adjustment is
recommended at 50% of the full scale range.
To enter Calibration Mode hold the magnet over PGM1 for 3 seconds. If the sensor is experiencing a fault
condition the “
” prompt will not appear until the fault(s) have been displayed. When the ITM enters Calibration
Mode the display will scroll “
Pgm1=Zero . . . Pgm2=Span
” twice before returning to Normal Mode (about 5
seconds).
