| Price | $3 |
|---|---|
| Category | Sensors |
| Availability | In stock |
| Delivery | Shipped across Lebanon, or collect from the lab |
A tin-dioxide gas sensor tuned to ethanol, on the usual 4-pin carrier board. Its heated element drops in resistance as alcohol vapour rises, and the board gives you both an analog voltage that tracks concentration on AO and a comparator output on DO that trips at a threshold you set with the trimmer. It covers roughly 0.05 to 10 mg/L, wants 5V at around 165 mA with the heater running, and needs a warm-up before readings settle. The sensor behind most DIY breathalysers.
Key features
- Tuned to alcohol and ethanol vapour
- Detection range roughly 0.05 to 10 mg/L
- Analog output (AO) and adjustable digital trigger (DO)
- 5V supply, around 165 mA with the heater on
- Needs a warm-up before readings settle
- Reports a trend - calibrate it for real figures
Details
Specifications
| Model | MQ-3 |
|---|---|
| Detects | Alcohol / ethanol vapour |
| Detection range | 0.05-10 mg/L |
| Operating voltage | 5V DC |
| Supply current | About 165 mA with the heater on, about 60 mA off |
| Heater power | Under 750 mW |
| Output | Analog (AO) plus digital threshold (DO), trimmer set |
| Sensing resistance | 2-20k at 0.4 mg/L alcohol |
| Operating temperature | -10C to +50C |
| Pins | VCC, GND, DO, AO |
