User manual for the Winsen MP901 air quality gas sensor, covering specifications, wiring, and handling precautions.
The MP901 is a planar semiconductor gas sensor designed for detecting gases such as alcohol, smoke, formaldehyde, toluene, benzene, acetone, lighter gas, and paint fumes. It uses a multilayer thick‑film process on a miniature Al₂O₃ ceramic substrate with integrated heater and metal‑oxide sensing layer, housed in a metal package.
The manual provides the sensor's electrical specifications, recommended test circuit, pin configuration, and detailed handling guidelines to ensure reliable performance and long‑term stability. This manual is written in Chinese.
| Detectable Gases | Alcohol, smoke, formaldehyde, toluene, benzene, acetone, lighter gas, paint fumes |
|---|---|
| Detection Concentration Range | 1–50 ppm |
| Operating Voltage (VC/VH) | 5.0 V ± 0.1 V DC |
| Load Resistor (RL) | Adjustable |
| Heating Resistance (RH) | 95 Ω ± 10 Ω (room temperature) |
| Heating Power (PH) | ≤ 300 mW |
| Sensor Resistance (RS) | 1 kΩ – 30 kΩ (at 10 ppm alcohol) |
| Sensitivity (S) | ≥ 5 |
| Concentration Slope (α) | ≤ 0.6 (R50ppm/R5ppm alcohol) |
| Ambient Temperature / Humidity | 20 °C ± 2 °C; 65 % ± 5 % RH |
| Minimum Pre‑heat Time | ≥ 48 hours |
It detects alcohol, smoke, formaldehyde, toluene, benzene, acetone, lighter gas, and paint fumes.
The sensor should be pre‑heated for at least 48 hours.
A DC supply of 5.0 V ± 0.1 V should be applied to both the heater (VH) and the test voltage (VC).
The heating power must not exceed 300 mW.