Name of the part 
MQ-137 Ammonia (NH₃) Gas Sensor
Your previous work, similar parts
I have searched for similar Fritzing parts such as MQ-2, MQ-3, MQ-4, MQ-7, and MQ-135, but I could not find a dedicated MQ-137 part.
The MQ-137 is specifically designed for ammonia (NH₃) detection, so it cannot be directly replaced by other MQ-series sensors.
Top view
(Please paste the image here — no links, image only)
The image should show:
- Top view of the MQ-137 sensor
- Clearly visible 6 pins
- The typical metal can cylindrical shape of MQ gas sensors
Acceptable images:
- A clear photo of the MQ-137 sensor
- A top-view or pin-layout image from the datasheet
Datasheet
The official manufacturer documentation is available here:
MQ-137 Datasheet (PDF)
Footprint
TO-5 (6-pin metal can gas sensor)
(Not an SMD package, typically mounted on a PCB or used with a breakout module)
Type
I did not read this
Breakout board, sub assembly, plug in module (A)
Antenna (AE)
Battery (BT)
Capacitor (C)
Diode (D)
Display (DS)
Fuse (F)
Hardware, mounting screws, etc. (H)
Jack, fixed part of a connector pair, header (J)
Relay (K)
Inductor, Coil, Ferrite bead (L)
Loudspeaker, Buzzer (LS)
Motor (M)
Microphone (MK)
Plug, movable part of a connector pair (P)
Transistor (Q)
Resistor (R)
Thermistor (RT)
Varistor (RV)
Switch (S)
Transformer (T)
Integrated Circuit (IC)
Crystal, Oscillator (Y)
Zener diode (Z)
Other – Gas Sensor (Ammonia / NH₃)
