Tin Dioxide Semiconductor Gas Sensor for Refrigerant Detection(HFCs) - SP-42A-00

• Target gas: HFCs (R134a,R-410a,R-407c)
• Heater voltage: 5.0 V ± 4%
• Circuit voltage: 5.0 V ± 4%
• Operating temperature: -10°C to 60°C
• Storage temperature: -20°C to 70°C
• Relative humidity: Less than 95% RH
• Sensor resistance: 04kΩ to 40kΩ
• Industrial gas leak detector

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

SP-42A-00 Gas Sensor for Refrigerant Detection Description
The SP-42A is a tin dioxide semiconductor gas sensor which has a high sensitivity to HFCs (e.g. Freon: R-134a) with improved cross sensitivity to other gases.

This model is suitable for R-134a, R-410a, R- 407c and other new Freon family which contain R-134a.

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

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

Standard Operating conditions
Symbol
Parameter
Specification
Conditions etc.
VH
Heater voltage
5.0 V ± 4 %
AC or DC
VC Circuit voltage
5.0 V ± 4 %
AC or DC
RL Load resistance
Variable
PS < 15 mW
RH Heater resistance
40 Ω ± 2 Ω
at room temperature
PH Heater power consumption
400 mW (Typical value)
PH = VH2 / RH
PS
Power dissipation of
sensing element
Less than 15 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
SP-42A-00
Symbol
Parameter
Specification
Conditions etc.
RS
Sensor resistance
4kΩ to 40kΩ
At 100 ppm of R-134a
β
Ratio of sensor resistance
0.50 to 0.65
Rs at 300 ppm of 134a
Rs at 100 ppm of R-134a

R/Rair
Resistance change in gas/air
≤ 0.40
Rs at 100 ppm of 134a
Rs in air
Standard Test Conditions:
Temp: 20°C ± 2°C
Humidity:65% ± 5%
(in clean air)
VC : 10.0 V ± 1%
VH : 5.0 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.

Shock
Acceleration:
Number of impacts:
100 G
5 times

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