FIGARO
PRODUCT INFORMATION
COM2442 - Evaluation Module for TGS2442
To facilitate evaluation of characteristics for the TGS2442
carbon monoxide sensor, Figaro has prepared the
COM2442 evaluation module. Testing is simplified by
using the continuous output signal generated by this
module. While the driving mode of TGS2442 involves
cyclic heater control and intermittent detection (using a 1
second cycle), the periodic sensor response is converted
into a continuous voltage signal by the software contained
in the module's microprocessor. Please refer to Figure 1
below for description of the major components of this
module.
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY WITH EACH CUSTOMER'S SPECIFIC APPLICATIONS. FIGARO STRONGLY
RECOMMENDS CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION AND, IN PARTICULAR, WHEN CUSTOMER'S TARGET GASES
ARE NOT LISTED HEREIN. FIGARO CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR WHICH SENSOR HAS NOT BEEN
SPECIFICALLY TESTED BY FIGARO.
LED
Buzzer
GND Vout Vc
Microcomputer
Test/Mute switch
TGS2442 sensor
GND
DC+10-12V
5
1
1
3
EXT
Figure 1 - COM2442 configuration
The module is equipped with a microprocessor which
controls the heater cycle, records output voltage at the
detection point, and converts the intermittent output signal
into a continuous signal. The TGS2442 carbon monoxide
sensor is mounted on the module in a socket--when
changing sensors, the sensor must be inserted with the
notch on its base facing to the top of the PCB (i.e. the side
which contains input terminals). Refer to Table 1 for a
description of each terminal and its function.
When the module is first powered on, the green LED will
blink (warm-up period). The LED should stop blinking
within 3 minutes, indicating the end of the warm-up period.
The Vout signal will immediately begin to be output after
the warm-up period and will be updated every 1 second.
e
p
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T
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(
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0
0
3
,
V
2
1
~
0
1
+
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ID
N
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G-
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C5
+
± V
2
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r
o
s
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e
SV
5
+
~
0
t
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p
t
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OD
N
Gd
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G-
t
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t
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/
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(
V
5
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)
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t
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m
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(
V
0
Table 1 - COM2442 terminal assignment