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

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• 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:

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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.
V_H	Heater voltage	5.0 V ± 4 %	AC or DC
V_C	Circuit voltage	5.0 V ± 4 %	AC or DC
R_L	Load resistance	Variable	P_S < 15 mW
R_H	Heater resistance	40 Ω ± 2 Ω	at room temperature
P_H	Heater power consumption	400 mW (Typical value)	P_H = V_H² / R_H
P_S	Power dissipation of sensing element	Less than 15 mW	P_S =(V_C - V_RL)²/R_S
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%
(O2)	Oxygen concentration	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)	V_C : 10.0 V ± 1% V_H : 5.0 V ± 1% R_L: 10 kΩ ± 5%
Standard Test Conditions:		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