Model: HNAG1000-H2S
Detection: H2S (Hydrogen Sulfide)
Detection Principle: Electrochemistry
Detection range: 0-10ppm, 0-100ppm, 0-500ppm
The HNAG1000-H2S online gas concentration detector is designed for the real-time, highly accurate detection of Hydrogen Sulfide (H2S) leaks in hazardous environments. Encased in a robust stainless steel shell, this device leverages advanced electrochemistry and microcontroller technology to ensure a fast response speed (T90 < 10S) and exceptional repeatability. With an Ex d IIC T6 explosion-proof rating and IP66 protection against splashing water and short periods of rain, it guarantees stable operation in challenging industrial sites.

This fixed H2S monitor incorporates an imported sensor and high-quality processing chips with automatic temperature and humidity compensation, effectively preventing zero drift and maintaining a high precision of ±2% F.S. The heavy-duty stainless steel shell houses a 2.5-inch high-definition color screen (TF) that displays real-time gas concentration, temperature, and humidity data.

For immediate on-site alerts, the device features a small yet powerful integrated sound and light alarm light. It utilizes a high-brightness luminous tube for clearer visual effects during gas emergencies. Furthermore, a stainless steel filter gasket is installed at the probe entrance to effectively filter dust, prevent other impurities from affecting use, and ensure clean gas circulation.

| Parameter | Technical Specification |
| Monitored Gas |
H2S (Hydrogen Sulfide) |
| Detection Principle |
Electrochemistry |
| Measurement Ranges |
0-10ppm, 0-100ppm, 0-500ppm |
| Resolution |
0.1PPM |
| Accuracy |
±2% F.S. |
| Standard Output Signals |
4-20mA (12-bit precision, 1Km distance), RS485 (MODBUS RTU, 1Km) |
| Relay Output |
1 set of passive contact relay (220VAC 3A / 24VDC 3A) |
| Operating Environment |
Temp: -20 ~ 50℃; Humidity: 0-95%RH |
| Power Supply |
DC24V±1% (24V circuit power supply) |
The internal circuit board provides clearly labeled interfaces for RS485, 4-20mA, sensor connections, the LCD display, a built-in buzzer, and normally open/normally closed relays. This allows the detector to simultaneously output standard RS485 and 4~20mA signals, making it fully compatible with various secondary meters, PLC, DCS, and DDC systems.

For maximum flexibility, the device supports various transmission methods. It can be equipped with 4/5G modules, Bluetooth/WiFi, and Wireless LoRa/ZigBee components. This enables real-time data to be transmitted to mobile phones, cloud platforms, or remote environmental monitoring centers without distance restrictions.

Safety in hazardous zones is paramount. The detector includes a standard infrared remote control, enabling operators to use the "Add/Cancel", "Function/Confirm", and "Move Right/Move Down" buttons remotely. This allows users to navigate the functional interface, perform calibrations, and adjust alarm settings without opening the stainless steel cover in explosive atmospheres.

Q: What is the service life of the electrochemical H2S sensor?
A: Under normal operating conditions, the electrochemical sensor has a service life of 3 to 5 years.
Q: How is the fixed H2S gas detector installed?
A: The detector supports multiple installation methods, including wall-mounted, pipe, ceiling, and bracket installation. It should be installed with the probe facing downwards, and if installed outdoors, a rain shield should be added.
Q: Can this device control external ventilation systems?
A: Yes. The standard configuration includes one set of passive contact relays (normally open and normally closed). It can directly drive equipment such as solenoid valves, fans, and external alarms, or drive high-power equipment via intermediate relays.
Q:Can this device be integrated into our facility's existing DCS or PLC control network?
A:Yes,it is fully compatible.The analyzer outputs standard 4-20mA and RS485 Modbus RTU signals concurrently.It easily interfaces with various secondary meters,data acquisition modules,PLCs,and DCS controllers,and can directly drive peripheral equipment like solenoid valves or fans.

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