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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 k? to 20 k?
? Industrial gas leak detector

Model Number: SB-42A-00
Data Sheet:

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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.
V_H	Heater voltage	0.9 V ± 0.05V	AC, DC or pulse
V_C	Circuit voltage	Less than 5 V	DC: Pin2 (+) - Pin 1 (-)
R_L	Load resistance	Variable (> 200 ?)	P_S < 10 mW
R_H	Heater resistance	2.8 ? ± 0.2 ?	at room temperature
I_H	Heater current	130 mA	I_H = V_H / R_H (typical value)
P_H	Heater power consumption	120 mW	P_H = V_H² / R_H
P_S	Power dissipation of sensing element	Less than 10 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	SB-42A-00 (tentative specifications)
Symbol	Parameter	Specification	Conditions etc.
R_S	Sensor resistance	2 k? to 20 k?	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)	V_C : 5.0 V ± 1% V_H : 0.9 V ± 1% R_L : 10 k? ± 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 after test.
Shock	Acceleration: Number of impacts:	100 G 5 times