Detcon IR-522 - Manual (Page 4)

3.0.2 Microprocessor Control Circuit
The control circuit is microprocessor based and is packaged as a plug-in f ield replaceable module, facilitating easy
replacement and minimum down time. Circuit functions include a basic sensor pre-amplif ier, 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 f ilter, and lugless terminals for f ield wiring.
Model IR-522 Combustible Hydrocarbon Sensor PG.4
BLU
YEL
BLK
WHT
mA
VDC Power In
4-20 mA Output
BRN
RED
Sensor
Base Connector Board
detcon inc.
Program Switch #2
FLT CAL
MicroSafe™ LEL Gas Sensor
HOUSTON, TEXAS
PGM 2
PGM 1
MODEL IR-522
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
H
C
H
H H
H
C
H
H H
Optical Filter