The GM-512B user manual provides product description, specifications, wiring, usage instructions, and safety precautions for the MEMS breath gas sensor.
The GM-512B is a MEMS breath gas sensor that detects hydrogen sulfide, alcohol, acetone and similar gases. It uses a micro‑heater on a Si substrate and converts changes in conductance into an output voltage.
The manual includes technical specifications, recommended pre‑heat and calibration procedures, wiring diagrams, handling precautions, packaging details, and RoHS compliance information. This manual is written in Chinese.
| Product Model | GM-512B |
|---|---|
| Product Type | MEMS breath gas sensor |
| Package | Ceramic |
| Detectable Gases | Hydrogen sulfide, alcohol, acetone |
| Detection Concentration | 0.5 ppm – 50 ppm H₂S |
| Supply Voltage (VC) | ≤24 V DC |
| Heating Voltage (VH) | 2.5 V ± 0.1 V (AC or DC) |
| Load Resistance (RL) | Adjustable |
| Heating Resistance (RH) | 80 Ω ± 20 Ω (room temperature) |
| Heating Power (PH) | ≤50 mW |
| Sensor Resistance (RS) | 10 kΩ – 100 kΩ (5 ppm H₂S) |
| Sensitivity | S ≥ 2 (R0/Rs at 5 ppm H₂S) |
| Test Conditions Temperature/Humidity | 20 °C ± 2 °C; 55 % RH ± 5 % |
It detects hydrogen sulfide, alcohol, acetone and similar gases.
For storage under 1 month pre‑heat at least 24 h; 1‑6 months at least 48 h; over 6 months at least 72 h.
The heating power must not exceed 50 mW.
Yes, it complies with the current RoHS directive and contains no restricted substances.