Product Introduction
The ZDG4-4 gas sensor module is a versatile four-in-one device supporting 1–4 gas detection types, including combustible gases, oxygen, carbon monoxide and hydrogen sulfide. It offers customizable sensor options and provides output via UART, Modbus and RS-485 interfaces. Featuring mature gas sensors and a high-performance processor, the module transmits sensor concentration data to a host computer via UART using the Modbus protocol. The compatible protocol supports protocols from multiple vendors.
Product Features
High integration
Small size
Stable performance
High accuracy
Multiple digital output protocols, including standard Modbus and compatible simple protocols
Application
- Industrial gas leakage detection
- Downhole operations
- Tunnel inspection
- Coal mine gas detection
Technical Specifications
| Working Voltage | 9–30 V DC (5 V customizable) |
| Working Current | < 150 mA (depends on sensor type): electrochemical < 5 mA; semiconductor < 100 mA; catalytic combustion < 160 mA; infrared < 100 mA; PID < 50 mA |
| Measuring Range | Set at the factory, subject to actual configuration |
| Output Signal | Standard: UART / Modbus / RS485 Optional: 0.4–2 V DC, PWM |
| Resolution | 1% FS |
| Preheating Time | 0 s |
| Response Time | T90 < 30 s |
| Accuracy | ±(20 ppm + 5% FS) |
| Temperature Range | -20°C to 60°C |
| Humidity Range | 0–95% RH (non-condensing) |
| Service Life | > 5 years |
| Size | 46 × 46 × 22 mm |
Dimensions
