Owner's manual

3.0.2 Microprocessor Control Circuit
The control circuit is microprocessor based and is packaged as a plug-in field replaceable module, facilitating easy
replacement and minimum down time. Circuit functions include a basic sensor pre-amplifier, sensor temperature
measurement, on-board power supplies, microprocessor, back-lit alpha numeric display, fault and calibration status
LED indicators, magnetic programming switches, and a linear 4-20 mA DC output.
3.0.3 Base Connector Board
The base connector board is mounted in the explosion proof enclosure and includes: the mating connector for the
control circuit, reverse input and secondary transient suppression, input filter, and lugless terminals for field wiring.
Detcon Model IR-540/IR-542 Carbon Dioxide Sensor PG.4
detcon inc.
Program Switch #2
FLT CAL
MicroSafe™ CO
2
Gas Sensor
HO USTON , TEXA S
PGM 2
PGM 1
MODEL IR-540
CONTRAST
Fault & Cal LEDs
Program Switch #1
Menu Driven Display
Plug-in Microprocessor Control Circuit
Display Contrast Adjust
Porous Membrane
Optical Filter
Active Detector
Lamp
Reference Detector
Optical Sample Gas Chamber
Optical Filter
CO
2
CO
2
BLU
YEL
BLK
WHT
mA
VDC Power In
4-20 mA Output
BRN
RED
Sensor
Base Connector Board