Tin Dioxide Semiconductor Gas Sensor for Refrigerant Detection - SB-42A-00

• Target gas: Freon
• Heater voltage: 0.9 V ± 0.05V
• Circuit voltage: Less than 5 V
• Operating temperature: -10°C to 60°C
• Storage temperature: -20°C to 70°C
• Relative humidity: Less than 95% RH
• Sensor resistance: 2 kΩ to 20 kΩ
• Industrial gas leak detector

  • Model Number: SB-42A-00
  • Data Sheet: Date Sheet File
Quantity:
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  • Tin Dioxide Semiconductor Gas Sensor for Refrigerant Detection
  • Tin Dioxide Semiconductor Gas Sensor for Refrigerant Detection
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Product Specification

SB-42A-00 Gas Sensor for Refrigerant Detection Description
The SB-42A-00 is a tin dioxide semiconductor gas sensor which has a high sensitivity to HFCs (e.g. Freon: R134a) with improved cross sensitivity to other gases.

This model is suitable for R134a, R410a, R407c and other new Freon family which contains R134a. A significant feature of low power consumption design 120mW) is advantageous for portable devices.

SB-42A-00 Gas Sensor for Refrigerant Detection Application
• Industrial gas leak detector

SB-42A-00 Gas Sensor for Refrigerant Detection Specifications

Standard Operating conditions
Symbol
Parameter
Specification
Conditions etc.
VH
Heater voltage
0.9 V ± 0.05V
AC, DC or pulse
VC Circuit voltage
Less than 5 V
DC: Pin2 (+) - Pin 1 (-)
RL Load resistance
Variable (> 200 Ω)
PS < 10 mW
RH Heater resistance
2.8 Ω ± 0.2 Ω
at room temperature
IH Heater current
130 mA
IH = VH / RH (typical value)
PH Heater power consumption
120 mW
PH = VH2 / RH
PS
Power dissipation of
sensing element
Less than 10 mW
PS =(VC - VRL)2/RS
Environmental conditions
Symbol
Parameter
Specification
Conditions etc.
Tao
Operating temperature
-10°C to 60°C
Recommended range
Tas
Storage temperature
-20°C to 70°C
RH
Relative humidity
Less than 95% RH
(O2)
Oxygen concentration
21% ± 1%
(Standard condition)

Absolute minimum level:
more than 18%
The sensitivity characteristics are influenced by the
variation in oxygen concentration.

Sensitivity characteristics
Model
SB-42A-00 (tentative specifications)
Symbol
Parameter
Specification
Conditions etc.
RS
Sensor resistance
2 kΩ to 20 kΩ
at 100 ppm of R-134a/air
β
Ratio of sensor resistance
0.50 to 0.65
Rs at 300 ppm of R-134a
Rs at 100 ppm of R-134a

R/Rair
Resistance change in gas/air
≤ 0.40
Rs at 100 ppm of R-134a
Rs in air
Standard Test Conditions:
Temp: 20°C ± 2°C
Humidity:65% ± 5%
(in clean air)
VC : 5.0 V ± 1% 
VH : 0.9 V ± 1% 
RL : 10 kΩ ± 5%
Pre-heating time: more than 48 hours
Mechanical characteristics
Items
Conditions
Specifications
Vibration
Frequency:
Vertical amplitude:
Duration:
100 cpm
4 mm
1 hour
Should satisfy the
specifications shown in the
sensitivity characteristics after
test.

Shock
Acceleration:
Number of impacts:
100 G
5 times

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