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The product is intended for specialists and requires qualified and authorized personnel. The product does not include assembly/use instructions . Putting the product into operation by unqualified persons leads to the loss of the warranty according to the Terms and Conditions on the site.
The specified technical parameters (current, power, etc.) represent maximum allowable values under ideal operating conditions. For safe use and optimal lifespan, it is recommended to operate the product continuously at no more than 50% of the specified maximum values.
NH3 and CO Gas Sensor, MQ-137, Ammonia, Analog and Digital, 5V
MQ137-based sensor module for detecting ammonia NH3 and carbon monoxide CO, ideal for air monitoring projects and security systems. It offers 0-5V analog output for concentration estimation and TTL digital output with LM393 comparator, has adjustable threshold from potentiometer and fast response under 1s, operates at 5V and is compatible with Arduino, ESP32 and Raspberry Pi.
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The MQ137 module, compatible with Arduino and other development boards, is designed for the detection of ammonia (NH3) and carbon monoxide (CO), ideal for air quality monitoring and environmental safety projects.
The capsule has a SnO2 element in its component that changes its resistance when exposed to ammonia gas (or other amine gases).
The sensor has analog and digital (TTL) output, being fully compatible with microcontrollers such as Arduino, Raspberry Pi or ESP32. It can operate both in analog mode, for concentration measurements, and in digital mode, for simple detection of the presence of gas.
The sensor has a wide detection area, fast response (under 1 second) and high sensitivity, with an integrated potentiometer for adjusting the sensitivity threshold. It uses an LM393 voltage comparator to generate the logic signal. Its compact housing and reliability recommend it for gas leak detectors, safety alarms, air monitoring or medical and industrial applications.
Specifications:
Model: MQ137
Detected gases: ammonia (NH3), carbon monoxide (CO)
Measured concentration: 10 - 300ppm
Supply voltage: 5V DC
Response time: <1s
Sensitivity: approximately 3%
Analog output: 0 – 5V (proportional to gas concentration)
Digital output: 0V or 5V (TTL logic)
Signal: digital active low level (LED on when detected)
Sensitivity adjustment: via integrated potentiometer
Compatible with: Arduino, Raspberry Pi, ESP32
LED indicator: for power and signal
Dimensions: 28 x 20mm
Use:
Power the module with 5V and connect the analog or digital outputs to the desired microcontroller. The digital output can be connected directly to a 5V relay module (on signal only).
When powered on, the power LED lights up.
Wait a few minutes for the sensor to preheat.
In the absence of gas, the digital output remains at 0V and the output LED is off.
Expose the sensor to the target gas (NH3 or CO). If detected, the LED lights up and the digital output becomes active.
If the sensor does not respond immediately, adjust the potentiometer until the output LED activates.
For more accurate concentration measurements, use the analog output and interpret the voltage using a microcontroller.
Avoid prolonged exposure to very high gas concentrations to maintain sensor accuracy and lifespan.
Pinout:
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
