MQ-137 Gas Sensor Module (Ammonia NH3) เป็นเซนเซอร์ตรวจจับแก๊สแอมโมเนียใช้ไฟเลี้ยง 5VDC Output ที่ได้เป็นทั้งแบบ Analog และ Digital

Features :
- Fast response (less than 1s)
- High sensitivity( 3%)
- the circuit voltage: DC5V
- Stable and long life
- Operating Voltage is +5V
- Detect/Measure NH3,Ammonia
- Concentration: 5-500ppm (Ammonia)
- Heater Resistance(RH): 313 Room Temp
- Heater consumption(PH): 900mW
- Sensing Resistance(Rs): 2K-15K(in 50ppm NH3)
- Sensitivity(S): Rs(in air)/Rs(5000ppm CH4)5
- Slope(): 0.6(R100ppm/R50ppm NH3)
- Analog output voltage: 0V to 5V
- Digital output voltage: 0V or 5V (TTL Logic)
- Preheat duration: 20 s
- Can be used as a digital or analog sensor
- The sensitivity of digital output can be adjusted using on board potentiometer
- The TTL output valid signal is low. (When the output is low, the signal light is on, it can be directly connected to the MCU or relay module)
- The voltage of the analog output, the higher the concentration, the higher the voltage.
- Arduino compatible
- Working humidity: 95%RH (nominal humidity 65%RH)
- Product dimensions (mm): 35 (L) * 20(W) * 28 (H)