Description:
OC-850 portable multi gas detector is customized to detect four typical acid and alkaline toxic flue gases: NO Nitric Oxide, NO₂ Nitrogen Dioxide, SO₂ Sulfur Dioxide, NH₃ Ammonia, which are core characteristic pollutants of thermal power plants, waste incineration, chemical industry and boiler flue gas denitrification & desulfurization processes.
All four gases adopt high-selectivity dedicated electrochemical sensors, effectively reducing cross interference between mixed flue gases and realizing stable quantitative detection of low-concentration tail gas.
The instrument supports dual sampling modes: built-in pump suction (flow rate 1L/min) and diffusion sampling. The pump suction sampling hose can directly extend into flue pipes, boiler exhaust outlets, workshop ventilation ducts and closed reaction tanks to extract gas samples for on-site rapid testing. The LCD color screen synchronously displays the concentration value, unit and alarm status of four gases, and supports storage of 9999 groups of alarm data for environmental emission filing and hidden danger traceability.
With Ex ib IIB T3 explosion-proof grade and IP65 dustproof & waterproof shell, the continuous working time can reach 100 hours under diffusion mode. Widely used in waste incineration power plants, thermal power boilers, chemical fertilizer factories, sewage denitrification workshops, environmental protection law enforcement exhaust sampling and industrial waste gas supervision.

Features:
- Detects 1–5 gases simultaneously
- Compatible with electrochemical, NDIR, PID, and semiconductor sensors
- Flexible gas configuration for different detection environments
- Pump suction or diffusion sampling mode (optional)
- LCD display showing gas concentration, gas type, and alarm status
- High-precision imported sensors for accurate measurement
- Built-in self calibration and zero calibration functions
- Temperature and pressure compensation for reliable readings
- Two-level alarm system: sound, light, and vibration
- Adjustable alarm set points
- One-key factory reset function
- Large capacity rechargeable lithium polymer battery
- Durable PC + TPE housing: anti-slip, waterproof, dustproof, explosion-proof
- Stainless steel filter for better gas flow and sensor protection
Technical Specification:
| Gas Detected | NO, NO2, SO2, NH3, Customized by customers | ||
| Detection principle | Customized by customers
Catalytic combustion、Electrochemistry、NDIR、PID, etc |
||
| Sampling Method | Diffusion type or Pump suction(1L/min) | ||
| Measure Range | NO: 0~100ppm, NO2: 0~100ppm, SO2: 100ppm, NH3: 0~100ppm, As gas type | ||
| Resolution | 1%LEL、0.1%VOL、1PPM、0.1PPM | ||
| Precision | ≤± 3% F.S. | ||
| Data store | 9999 groups alarm information | ||
| Response Time | ≤10S | Recovery Time | ≤10S |
| Repeatability | ≤±1% | Linearity error | ≤±1% |
| Zero shift | ≤±1%(F.S/Y) | Display | LCD screen |
| Operating language | English or Chinese | Gas unit | PPM, %VOL, %LEL |
| Temperature | -40~70℃ | Humidity | 0-95%RH |
| Explosion-Proof | ExiaⅡCT4 | Protection level | IP66 |
| Alarm mode | Sound, light and vibration | Operating time | 100hours(off pump) |
| Dimensions | 205*75*32mm | Weight | 300g |
Remark: If you need gas or measuring range not listed on the above, pls send us your details requirments for further discussion.
Applications:
- Thermal power plant boiler flue gas desulfurization and denitrification system operation monitoring
- Domestic waste incineration power plant tail gas toxic pollutant on-site inspection
- Chemical fertilizer plant, nitric acid workshop acid gas leakage and exhaust emission detection
- Sewage treatment plant SNCR denitrification workshop ammonia escape & nitrogen oxide monitoring
- Environmental protection law enforcement department industrial waste gas sampling and evidence collection
- Cement plant, glass kiln flue gas pollutant regular spot check
- Hazardous waste disposal incineration line flue gas multi-index safety testing
Company profile
We Henan Oceanus is located in Henan, a land with a long history and profound cultural heritage, has been dedicated to the research, development, production, and sales of Gas detection system and Environment equipments since its establishment. With exquisite technology and outstanding quality, we have won widespread recognition in the global marketing.

01. Business areas
As a leader in the field of Gas detector and Air quality monitor system, we Henan Oceanus will be continued to expand its business scope and provide customers around the world with customizable Air quality monitor system of various types and specifications.
02. Values and ideas
Our company upholds the core values of integrity and quality service, focusing more on friendship with our customers. We always adhere to integrity management, customer-centered, and provide a full range of pre-sales, sales, and after-sales services to ensure that customers can be worry-free when using our products.
03. Global Service Network
We have a comprehensive global service network, offering timely, professional pre-sales consultation, after-sales service, and technical support for overseas users. Regardless of where users are located, they can enjoy our attentive and thoughtful service.
04. Customer Service
With excellent products and services, Henan Oceanus Gas detector and Air quality monitor system have been exported to more than 100 countries around the world and have won widespread praise.

Our After-sales service:
1. OEM service for LOGO, model, Technical Parameters, Operation manual, etc.
2. Free calibration service and provide calibration methods.
3. One year warranty and lifetime warranty
Our address:
No. 2206, Wenhua Chanye Building Block B, No. 77, Shangding Road, Zhengzhou Area, Henan Pilot Free Trade Zone
Email: info@china-oceanus.com
Telephone: +86 0371 60998169
Mobile/Whatsapp: +86 15981942832
Mobile/Whatsapp: +86 13673683950





