Detcon IR-642 - Manual (Page 6)

3.2 A PPLICATION
Model IR-640/IR-642 MicroSafe™ sensors are designed to detect and monitor CO2 gas in ambient air. Minimum sen-
sitivity and scale resolution is 0.01%. Operating temperature range is -40° F. to +175° F. While the sensor is capable of
operating outside these temperatures, performance specifications are verified within the limit.
3.2.1 Sensor Placement/Mounting
Sensor location should be reviewed by facility engineering and safety personnel.
3.3 S
PECIFICATIONS
Method of Detection
NDIR Optical
Electrical Classification
Class I; Groups B, C, D; Div. 1.
Response Time
Detcon Model IR-640/IR-642 Carbon Dioxide Sensor PG.6
Functional
Block
Diagram
Functional
Block
Diagram
Analog 4-20 mA Out
Power In
Relays Out
Pre-Amp Display
Temperature
Compensation
Alarm & Fault
Relays
RS-485 & 4-20mA
Micro-
processor
Transmitter
Power Supply
Optical
Sensor
I/O Circuit
Protection
Serial RS-485 Out
0
4
8
12
16
20
20 40 60 80 100
% of Range of Detection
m
A
D
C
S
ig
n
a
l
O
u
tp
u
t
Output Response Curve