Specifications:  

• Model No.: MQ137
• Sensor Type: Semiconductor
• Standard Encapsulation: Bakelite (Black Bakelite)
• Detection Gas: Ammonia
• Concentration: 5-500ppm (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 Temp
• Heater consumption(PH): ≤900mW
• Sensing Resistance(Rs): 2KΩ-15KΩ(in 50ppm NH3)
• Sensitivity(S): Rs(in air)/Rs(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