Portable Diffusion 4-in-1 Gas Detector
The Portable Diffusion 4-in-1 Gas Detector is a lightweight and compact multi-gas monitoring device designed for personal safety protection. It supports simultaneous detection of 1–4 gases using natural diffusion sampling, delivering reliable performance in hazardous and confined environments.
Core Features
Simultaneous detection of 1–4 gases (configurable)
Selectable concentration units: ppm, μmol/mol, mg/m³, %VOL, %LEL, pphm, ppb
Natural diffusion sampling method
Intrinsically safe circuit design with strong anti-static and EMI resistance
Splash-proof, dust-proof, vibration-resistant (IP65)
Compact size and lightweight design (approx. 200g)
Three display modes:
Four-gas simultaneous display
Large-font single-channel cyclic display
Real-time concentration curve
Optional Max / Min / Average value display
Real-time or timed detection modes
Multiple alarm methods:
Audible alarm
Visual alarm
Audible & visual alarm
Vibration alarm
Alarm types: concentration, low battery, fault
Alarm modes: low / high / interval / TWA
Automatic zero-point tracking
Multi-level calibration with misoperation prevention
Factory reset function
Optional temperature & humidity measurement
Optional RS485 and customized communication interfaces
OEM / ODM customization supported
Technical Specifications
| Item | Specification |
| Detectable Gases | Toxic gases, O₂, CO₂, combustible gases, TVOC (1–4 gases configurable) |
| Detection Principles | Electrochemical, Catalytic Combustion, Infrared (NDIR), Thermal Conductivity, Semiconductor, PID |
| Detection Range | 0–1 / 10 / 100 / 1000 / 5000 / 50000 ppm; 0–100%LEL; 0–200 mg/L; 0–20%, 50%, 100%VOL |
| Resolution | Up to 0.001 ppm; 0.1%LEL; 0.001%VOL (customizable) |
| Typical Accuracy | ≤ ±3% F.S. (customizable) |
| Linearity | ≤ ±2% |
| Repeatability | ≤ ±2% |
| Uncertainty | ≤ ±2% |
| Response Time | T90 ≤ 30 seconds |
| Recovery Time | ≤ 30 seconds |
| Operating Temperature | –20°C to +55°C (typical); –40°C to +70°C (limit) |
| Operating Humidity | ≤ 95% RH (non-condensing) |
| Sampling Method | Diffusion type |
| Calibration Flow Rate | 500 mL/min |
| Display | 2.31” color screen, 4-button operation |
| Power Supply | DC 3–5V, 2100mAh rechargeable lithium polymer battery |
| Communication | USB (charging & data); optional RS485, infrared |
| Data Storage | 100,000 records (expandable) |
| Protection Rating | IP65 |
| Explosion Protection | Ex ia IIC T4 Ga; Ex iaD 21 T130°C |
| Dimensions | 130 × 68 × 34 mm |
| Weight | Approx. 200 g |
Applications
Oil & Gas Industry
Chemical Plants
Pharmaceutical Industry
Environmental Monitoring
Gas Distribution
Warehousing & Logistics
Flue Gas Analysis
Air Quality Management
Confined Space Entry
Suitable for all personal portable gas monitoring scenarios.
