Fixed H2S Preprocessing Online Monitoring System
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Model: HNAG1000-H2S
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Detection: H2S (Hydrogen Sulfide)
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Detection Principle: Electrochemistry
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Detection range: 0-10ppm, 0-100ppm, 0-500ppm, 0-2000ppm, 0-10000ppm
Product Description
High-Precision H2S Preprocessing Online Monitoring System
The HNAG1000-H2S Preprocessing Online Monitoring System is engineered for the real-time, highly accurate detection of Hydrogen Sulfide (H2S) concentration and leakage across severe industrial environments. By integrating a high-performance electrochemical sensor with advanced microcontroller technology, this system delivers an exceptionally fast response speed (T90 < 10s), high measurement accuracy (±3% F.S.), and outstanding stability. Utilizing an explosion-proof wiring method, the device is fully certified for hazardous locations and integrates seamlessly with PLCs, DCS, and standard control alarm systems.
Robust Stainless Steel Design & Gas Sampling Mechanism
Encased in a heavy-duty stainless steel cabinet, the monitoring system relies on a meticulously engineered continuous gas sampling process. The extracted H2S gas first passes through a high-efficiency filter to strictly remove dust, particulates, and impurities. A dedicated sampling pump then directs the sample into a precision flowmeter, maintaining the incoming gas flow rate securely between 0.3 and 0.5 L/Min. This regulated pretreatment guarantees that the electrochemical sensor operates under optimal conditions before the gas is exhausted safely.
Technical Specifications of Hydrogen Sulfide Monitor
| Parameter | Technical Specification |
| Monitored Gas |
H2S (Hydrogen Sulfide) |
| Detection Principle |
Electrochemistry |
| Measurement Ranges |
0-10ppm, 0-100ppm, 0-500ppm, 0-2000ppm, 0-10000ppm |
| Resolution |
0.01ppm, 0.1ppm, 1ppm |
| Sampling Accuracy |
±3% F.S. |
| Response Time |
T90 < 10s |
| Standard Output Signals |
4-20mA (12-bit precision, 1Km distance), RS485 (MODBUS RTU, 1Km), Passive contact relays (220VAC 3A / 24VDC 3A) |
| Optional Output Signals |
Voltage (0.4-2V, 0-5V, 0-10V), Wireless (GPRS, 4G, WIFI, LORA, ZigBee) |
| Operating Environment |
Temperature: -20 ～ 50℃; Humidity: 0-95%RH |
| Sampling Distance |
Up to 80 meters (Recommended within 20 meters) |
| Power Supply |
220V AC |
Industrial Applications & Flange Installation
This continuous H2S monitoring system is an essential safety component deployed widely in petroleum and petrochemical refineries, chemical processing plants, sewage treatment facilities, underground gas pipeline maintenance, and environmental monitoring stations. The system is designed to support standard pipeline flange installations and wall-mounted setups, ensuring secure, leak-proof sampling directly from the source.
Customized Gas Pretreatment Configurations
To accommodate the highly toxic and corrosive nature of Hydrogen Sulfide alongside complex plant conditions, multiple tailored internal configurations are available:
1.Normal to Medium Temperatures: Configurations equipped with condensation units and timed peristaltic drainage pumps, ideal for negative-pressure pipelines and moisture-heavy extraction.
2.High-Temperature & Dusty Environments (400-800°C): Advanced systems integrating vortex flow cooling coils, dual filtration, and automatic time-relay solenoid valves for pipeline reverse-purging to prevent filter clogging.
3.Explosion-Proof Pneumatic Setup: Highly recommended configurations utilizing pneumatic pumps driven by plant compressed air and full stainless-steel pipelines to ensure maximum safety in highly combustible zones.
Frequently Asked Questions (FAQ)
Q: What is the expected service life of the electrochemical H2S sensor?
A: The electrochemical H2S sensor is a consumable component with a typical operational service life of approximately 1 to 3 years. The actual duration depends on the specific detection environment, background gases, and target gas exposure levels.
Q: What routine maintenance does the sampling system require?
A: You must replace the internal filter when the color of its core chip changes, which typically happens every 3 months under standard industrial testing environments. Additionally, if the unit is operating between -20°C and 60°C without an automatic drainage configuration, the water produced by the filter must be manually drained. The sampling air pump generally requires replacement after approximately one year of continuous use.
Q: How are alarm thresholds managed?
A: The standard system configuration features a two-level threshold alarm, with an optional three-level alarm structure available. When triggered, the system can activate on-site sound and light alarms, external ventilation devices via relay switches, remote controllers, and instantly notify computer data acquisition software.
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