Fixed NH3 Preprocessing Online Monitoring System
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Model: HNAG900-NH3
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Detection: NH3 (Ammonia)
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Detection Principle: Electrochemistry, Thermal conduction
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Detection range: 0-10ppm, 0-20ppm, 0-200ppm, 0-5000ppm, 0-10000ppm, 0-30%vol, 0-50%vol, 0-100%vol
Product Description
High-Precision NH3 Preprocessing Online Monitoring System
The HNAG900-NH3 Preprocessing Online Monitoring System is specially engineered for the continuous, real-time detection of Ammonia (NH3) concentration and leakage across severe industrial environments. By integrating high-performance electrochemical and thermal conduction sensors with advanced microcontroller technology, this system delivers an exceptionally fast response speed (T90 < 10s), high measurement accuracy (±3% F.S.), and outstanding repeatability. Utilizing an explosion-proof wiring method, the device is fully certified for hazardous locations and integrates seamlessly with user computers, 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 NH3 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 sensors operate under optimal conditions before the gas is safely exhausted.
Technical Specifications of Ammonia Monitor
| Parameter | Technical Specification |
| Monitored Gas |
NH3 (Ammonia) |
| Detection Principle |
Electrochemistry, Thermal conduction |
| Measurement Ranges |
0-10ppm, 0-20ppm, 0-200ppm, 0-5000ppm, 0-10000ppm, 0-30%vol, 0-50%vol, 0-100%vol |
| Resolution |
0.01ppm, 0.1ppm, 1ppm, 0.01%vol, 0.1%vol |
| 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 NH3 monitoring system is an essential safety component deployed widely in chemical plants, petroleum and petrochemical refineries, fertilizer production, sewage treatment facilities, 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 process pipelines or exhaust stacks.
Customized Gas Pretreatment Configurations
To accommodate the specific challenges of toxic ammonia gas monitoring and 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 NH3 sensors?
A: The electrochemical and thermal conduction sensors are consumable components 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 ammonia 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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