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MiCS-5521 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - CO/VOC Sensor - e2v

भाग संख्या MiCS-5521
समारोह CO/VOC Sensor
मैन्युफैक्चरर्स e2v 
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MiCS-5521 pdf
MEASUREMENT CIRCUIT
Fig. 2 shows the pin connections of the MiCS-5521 gas
sensor. A simple circuit to measure the pollution level is
proposed in Fig. 3. The heating voltage VH is applied to a 75
resistor connected to pin 3 and pin 1 is connected to
GND. This resistor is necessary to obtain the right heater
power (2.4 V and 76 mW).
A load resistor RL is connected in series with RS to convert
the resistance RS to a voltage VS between pins 2 and 4. RS
can then be calculated by the following expression:
RS = RL /(VCC - VS) x VS
RL must be 820 Ω at the lowest in order not to damage the
sensitive layer.
32
RH RS
41
Pin Connection
1 Heater ground
2 Sensor pin
3 Heater power
4 Sensor pin
Fig. 2: Equivalent circuit of MiCS-5521 (top view)
Gas VCC
Sensor
33 22
VH 4411
RL
VS
GND
Fig. 3: Measurement circuit for pollution gas detection
ELECTRICAL SPECIFICATIONS
Maximum Ratings
Rating
Maximum sensor supply
voltage
Maximum heater power
dissipation
Maximum sensitive layer
power dissipation
Relative humidity range
Ambient operating
temperature
Storage temperature range
Storage humidity range
Symbol
VCC
PH
PS
RH
Tamb
Tsto
RHsto
Value/
Range
5 ± 0.1
88
8
5 95
-30 85
-40 120
5 95
Unit
V
mW
mW
%RH
°C
°C
%RH
Operating Conditions
Parameter
Heating power
Heating voltage
Heating current
Heating resistance
(see note 1)
Symbol
PH
VH
IH
RH
Typ Min Max Unit
76 71 81 mW
2.4 - - V
32 -
- mA
74 66 82 Ω
Sensitivity Characteristics
Characteristic
CO detection range
Sensing resistance
in air (see note 2)
Sensitivity factor
(see note 3)
Symbol Typ Min Max Unit
FS 1 1000 ppm
R0 - 100 1000 kΩ
SR
3.0 1.8 6.6
-
Notes:
1. Resistance at heating power.
2. Sensing resistance in air (R0) is measured under
controlled ambient conditions, i.e. synthetic air at 23 ± 5
°C and 50 ± 10% RH.
3. Sensitivity factor (SR) is defined as RS at 60 ppm of CO
divided by Rs at 200ppm of CO. Test conditions are 23 ±
5 °C and 50 ± 10% RH.
© e2v technologies (uk) limited 2008
Document subject to disclaimer on page 1
A1A-MiCS-5521 Version 2, page 2

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