MICS-5131 ETC2 [List of Unclassifed Manufacturers], MICS-5131 Datasheet - Page 2

• Manufacturer Part Number: MICS-5131
• Description: Ethanol Gas Sensor
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

R
S
/R
Important Precautions:
Please read the following instructions carefully before using the MiCS-5131 sensor described in this
document to avoid erroneous readings and to prevent the device from permanent damage.
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•
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0
MiCS-5131 Product Data Sheet
0.1
Operating Mode:
The recommended mode of operation is a constant power
mode. A heater power of P
causes the temperature of the sensing resistor (R
reach about 450° C.
Detection of ethanol is achieved by measuring the sensing
resistor R
Sensor Response:
The sensor response to ethanol in air is represented in
Figure 1. The sensor resistance R
resistance under air (R
1
Figure 1: R
10
The sensor must not be wave soldered without protection or exposed to high concentrations of organic solvents,
ammonia, or silicone vapors in order to avoid poisoning the sensitive layer.
Heating powers above the specified maximum rating of 120mW can destroy the sensor due to overheating.
This sensor is to be placed in a filtered package that protects it against any water or dust projection.
For any additional questions, please contact us at:
S
at 50% RH and 25°C.
during operation.
S
/ R
0
as a function of gas concentration
Ethanol [ppm]
0
).
100
S e n s o r C h a r a c t e r i s t i c s
H
= 102 mW is applied. This
S
is normalized to the
1000
S
) to
Page 2 of 5
P
R
M i c r o C h e m i c a l S y s t e m s
Measurement Circuit:
Figure 2 shows the pin connections of the MiCS-5131 gas
sensor. A simple circuit to measure the ethanol level is
proposed in Figure 3. The heating voltage V
pins 3 and 1. A load resistor R
R
pins 2 and 4. R
expression:
H
S
R O D U C T
Figure 2: Equivalent circuit (top view) of MiCS 5131.
to convert the resistance R
Figure 3: Measurement circuit for ethanol detection.
3
4
2
1
S
V
can then be calculated by the following
H
R
S
R
Gas
Sensor
= R
S
R
D
L
L
/(V
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A T A
L
CC
3 2
4
S
1
2
3
4
is connected in series with
V
1
to a voltage V
- V
CC
Pin Number
Doc NO: 0178 Rev. B
S
Heater Ground
Sensor Pin
Heater Power
Sensor Pin
) ⋅
GND
V
S
S
H
is applied to
H E E T
S
V
between
S