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MQ-138 MQ138 Semiconductor Gas Sensor For Domestic VOC Gas Alarms

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MQ-138 MQ138 Semiconductor Gas Sensor For Domestic VOC Gas Alarms

Model Number : MQ138 MQ-138

Place of Origin : CN

MOQ : 1PCS

Price : Negotiable

Payment Terms : L/C, D/A, D/P, T/T, Western Union, MoneyGram

Supply Ability : 5000PCS

Delivery Time : 5-8 work days

Packaging Details : Standard packaging

Storage Temperature : - 20℃ - 70℃

Operating Temperature : - 10℃ - 50℃

Loop Voltage : ≤ 24V DC

Heater Voltage (Vh) : 5.0V ± 0.2V, AC or DC

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MQ-138 MQ138 Semiconductor Gas Sensor For Domestic VOC Gas Alarms

Working Principle:

The SnO₂ sensitive material of the MQ138 gas sensor has low conductivity in clean air. When volatile organic compounds (VOCs) or other target gases are present, the sensor's conductivity increases with the rise of the gas concentration. Users can convert the change of conductivity into a corresponding output signal of gas concentration through a simple circuit.

Applications:

Widely used in domestic VOC gas alarms, which can monitor VOC pollutants harmful to human health in the home environment.
Applied to industrial VOC gas leakage alarms, which can detect VOC gas leakage in industrial production processes to ensure production safety and environmental protection.
Used in portable gas detectors, which are convenient for on - site detection of gas concentrations due to their portability.

Parameter	Symbol	Value	Unit	Remarks
Model	-	MQ138	-	-
Sensor Type	-	Semiconductor	-	-
Standard Encapsulation	-	Bakelite, Metal cap	-	-
Target Gas	-	Toluene, alcohol, hydrogen	-	-
Detection Range	-	5 - 500	ppm	-
Standard Circuit Conditions (Loop Voltage)	Vc	5.0V±0.1V	DC	-
Heater Voltage	Vh	5.0V±0.1V	AC or DC	-
Load Resistance	RL	Adjustable	-	-
Heater Resistance	Rh	30Ω±3Ω	-	At room temperature
Heater Consumption	Ph	≤950	mW	-
Sensitivity	S	Rs (in air)/Rs (50 ppm toluene)≥2	-	-
Output Voltage	△Vs	≥0.5	V	In 50 ppm toluene
Concentration Slope	α	≤0.6	-	R₂₀₀ ppm/R₅₀ ppm toluene
Standard Test Temperature	-	20℃±2℃	-	-
Standard Test Humidity	-	55%±5%	RH	-
Pre - heat Time	-	Over 48	hours	-
Operating Temperature	-	- 20 - 50	℃	Refer to the sixth reference, which may be different from other data. For reference only
Storage Temperature	-	- 20 - 70	℃	-

MQ-138 MQ138 Semiconductor Gas Sensor For Domestic VOC Gas Alarms

Product Tags:

MQ138 semiconductor gas sensor

VOC gas alarm sensor

domestic gas sensor with warranty

MQ-138 MQ138 Semiconductor Gas Sensor For Domestic VOC Gas Alarms Images

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