MQ-137 NH3 ammonia gas sensor module for Arduino, Raspberry Pi and MCU

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The MQ-137 ammonia gas sensor module has high sensitivity to ammonia and it was created specifically for Arduino, Raspberry Pi and easy to implement in various MCU.
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Availability: In stock

Excl. Tax: €41.40 Incl. Tax: €50.51

Product Description

Details

Sensitive material of MQ-137 gas sensor is SnO2, which with lower conductivity in clean air. When the ammonia gas (NH3) exists, the sensor’s conductivity gets higher along with the gas concentration rising. The conversion of the output signal, according to the gas concentration detected, is entrusted to a simple circuit, in order to be so easily interfaced to microcontroller or discrete in development kit such as Raspberry and Arduino.
 
Technical specification:
Detection range: 10~300ppm
Working voltage: 5.0V±0.2V AC or DC
• with the signal light indicates the output
• the dual signal output (analog output, and TTL-level output)
• TTL output valid signal is low
• the analog output increases with the concentration, the higher the voltage the higher the concentration
• the ammonia gas with high sensitivity
• with a long life and reliable stability
• fast response characteristics
• with mounting holes to facilitate fixed installation

Model No.
MQ-137
Sensor Type
Semiconductor
Standard Encapsulation
Stainless steel
Detection Gas
Ammonia
Concentration
10-300PPM (Ammonia)
Circuit
Loop Voltage
Vc
≤24V DC

Heater Voltage
VH
5.0V±0.2V AC or DC

Load Resistance
RL
Adjustable
Character
Heater Resistance
RH
31Ω±3Ω(Room Tem.)

Heater consumption
PH
≤900mW

Sensing Resistance
Rs
2KΩ-15KΩ(in 50ppm NH3)

Sensitivity
S
Rs(in air)/Rs(in 5000ppm CH4)≥5

Slope
α
≤0.6 (R100ppm/R50ppm NH3)
Condition
Tem. Humidity
20℃±2℃; 65%±5%RH

Standard test circuit
Vc:5.0V±0.1V
 VH: 5.0V±0.1V

Preheat time
Over 48 hours


Dimension: 32 x 22 x 30mm


Connection mode:
1. GND
2. AO
3. DO
4. VCC

Additional Information

Additional Information

SKU P16092241

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