Fixed Pump-Suction 4-in-1 Gas Detector EX O2 H2S CO
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Model: HNAG1000-4H
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Detection: EX (Combustible) / O2 / H2S / CO
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Detection Principle: Catalytic combustion / Electrochemistry
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Detection range: EX 0-100%LEL ; H2S 0-100PPM ; CO 0-1000PPM ; O2 0-30%VOL
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Product Description
High-Performance Fixed Pump-Suction 4-in-1 Gas Detector
The HNAG1000-4H online combustible and toxic gas concentration detector is engineered for the real-time, highly accurate monitoring of four critical gases simultaneously: EX, O2, H2S, and CO. Built with an Ex d IIC T6 explosion-proof aluminum housing and an IP66 protection rating, this robust analyzer is specifically designed to withstand harsh industrial environments, including petrochemical plants, refineries, underground pipe networks, and tunnel construction sites.
Active Pump-Suction Sampling Technology
Unlike standard passive diffusion models, this detector features a specialized active pump-suction module integrated at its base. This allows the device to actively draw air samples from pipelines, confined spaces, or specific targeted zones, significantly improving the response speed (T90 < 10S) and overall measurement precision (±2% F.S). The detection system relies on imported catalytic combustion sensors for combustible gases and advanced electrochemistry sensors for O2, H2S, and CO.
Technical Specifications & Internal Architecture
| Parameter | Specification |
| Monitored Gases |
EX / O2 / H2S / CO |
| Measurement Range |
EX: 0-100%LEL ; H2S: 0-100PPM ; CO: 0-1000PPM ; O2: 0-30%VOL |
| Resolution |
EX: 0.1% LEL ; H2S: 0.1 PPM ; CO: 1 PPM ; O2: 0.1% VOL |
| Power Supply |
DC24V±1% (DC 12V-30V compatible) |
| Wired Output Signals |
4-20mA (1Km transmission), RS485 MODBUS RTU |
| Relay Output |
1 set of passive contact relay (220VAC 3A / 24VDC 3A) |
The internal circuit board is intuitively designed, supporting simultaneous standard RS485 and 4~20mA signal outputs. It also includes an integrated relay to directly drive external equipment, such as solenoid valves or high-power exhaust fans, immediately during an alarm event.
Advanced IoT Integration and Remote Commissioning
To meet the demands of modern smart factories, the gas detector offers extensive communication output options. It can be equipped with wireless transmission modules including 4G, WiFi, Bluetooth, LoRa, or ZigBee. The host uploads data directly to the cloud platform via the IoT module, enabling remote functions such as online alerts, data analysis, and data storage on computers and mobile phones.
Additionally, operators can utilize the standard infrared remote control to safely adjust alarm thresholds and perform multi-level calibration without needing to open the enclosure in explosive hazard zones.
Frequently Asked Questions (FAQ)
Q1: Can this multi-gas detector be integrated into our existing DCS system?
A: Yes, it features standard 4-20mA and RS485 outputs, making it fully compatible with PLC, DCS, DDC systems, and various secondary data acquisition modules.
Q2: What is the expected service life of the sensors?
A: Under normal industrial operating conditions, the service life of the sensors is 3 to 5 years.
Q3: How does the local visual and audible alarm work?
A: The device is equipped with an integrated high-brightness sound and light alarm. A two-level alarm is standard, triggering immediate on-site warnings when gas concentrations exceed safe thresholds.
Q4: Can I read the data clearly in a dark environment?
A: Absolutely. The detector features a 2.5-inch high-definition color screen (TF) that displays real-time gas concentrations, ambient temperature, and humidity clearly in any lighting condition.
Q5: Does the sensor require manual zeroing frequently?
A: No, the system automatically tracks the zero point to prevent drift. It also features temperature and humidity compensation to ensure long-term stability and reliability.
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