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ALCOHOL DETECTOR

SCM130A	SCM130MD55	SCM130MD65
	SCM315

SCM130MD55 - Alcohol Detector - Ethanol

SCM130MD55

SCM130MD is a tin dioxide semiconductor gas sensor which is designed for breath alcohol detection. It gives high sensitivity to alcohol vapors with quickly response rate at high relative humidity. SCM130MD is more suitable for breath detection and automobile ignition locking systems.

Structure

The sensitive material of SCM130MD is carried on Pt heater coil and an electrode was embedded in it. The sensor element is embedded in TO metal house with stainless steel mesh (100 mesh) window.

Operating Conditions

The following schematics are two typical driving circuit of SCM130MD. The change of the sensor resistance (RS) is obtained as the change of the output voltage across the fixed or variable resistor (RL). In order to obtain the best performance and specified characteristics, the values of the heater voltage (VH) detect voltage (VD) and load resistance (RL) must be within the range of values given in the standard operating conditions shown in the table 1.

VC: Circuit voltage

VH: Heater voltage

RL: Load resistance

RH: Heater resistance

VRL: Voltage across load resistance

RS: Sensor resistance

（1：＋ polarity，2： signal, 3：－ polarity）

Standard operating conditions

Symbol	Description	Specification	Comment
V_D	Detector voltage	=< 5 V	DC or AC
V_H	Heater voltage	0.9V +/-0.05V	DC or AC
R_L	Load resistance	>=200Ω adjustable
R_H	Heater resistance	2.7Ω ± 0.2Ω	At ambient temperature
I_H	Heater resistance	145mA	IH=VH/RH
P_H	Heater power consumption	130 mW.	PH=VH2/ RH (Typical value)
P_H	Power dissipation of sensor	=<10 mW	PS=(VC-VRL)2/RS

Ambient condition of operation

Symbol	Description	Specification	Comment
T_ao	Operation temperature	De -20 °C to +50 °C	Recommended range
T_as	Storage temperature	De -20 °C to +70 °C
R_H	Relative humidity	Less than 95% Rh
O₂	Oxygen concentration	21% ±1% (at standard condition) The sensitivity characteristics are influenced by the variation in oxygen concentration.

Sensitivity

Symbol	Description	Valor	Conditions
R_s	Sensor resistance	1KΩ to 11KΩ	At ethanol 130ppm
β	Sensitivity	0.50±0.15	RS(at ethanol 300ppm)/RS (at ethanol 50ppm)
Standard test conditions	Temp. 20 °C ± 2 °C Vc. 5V ±1% RL : 3.6kΩ ±5% Humidity 65% ± 5% V_H:0-9V ±1% Clean air. 48hrs of pre-heating

Mechanical characteristics

Condition	Values	Comments
Vibration	Frequency: 100 cpm. Vertical amplitude: 4mm. Duration: 1 hour.	Should satisfy the specifications shown in the sensitivity characteristics.
Shock	Max. acceleration: 100 G. Number of impacts: 3

Response

Code: SCM130MD55

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