Description:
OC-850 portable multi gas detector is a customizable handheld industrial toxic & malodorous flue gas monitoring terminal, equipped with five independent high-selectivity electrochemical sensor combination: H₂S Hydrogen Sulfide, CO Carbon Monoxide, SO₂ Sulfur Dioxide, NO₂ Nitrogen Dioxide, NH₃ Ammonia.
All five gases adopt separated independent electrochemical sensors, effectively reduce cross interference among mixed acid, alkaline and toxic gases. It can precisely detect various toxic and irritant flue gas produced from waste incineration, metallurgical smelting, chemical reaction, sewage fermentation and industrial waste gas emission.
The detector supports dual sampling modes: standard diffusion passive sampling and optional 1L/min pump suction active sampling, suitable for stack sampling, underground sewage tanks, closed chemical workshops and waste disposal sites gas collection. Built-in stainless steel anti-corrosion filter screen blocks corrosive acid mist, smoke dust and water vapor to protect internal sensors. LCD screen synchronously displays real-time concentration, gas name and over-limit alarm status of five gases.
With Ex ib IIB T3 explosion-proof certification and IP65 dustproof & waterproof grade, triple sound-light-vibration over-limit alarm, stores up to 9999 groups alarm records. Wide working temperature -40℃~70℃, 100 hours long standby without pump. Widely applied to waste incineration plants, metallurgical factories, sewage treatment plants, chemical enterprises, environmental law enforcement flue gas sampling and industrial waste gas safety patrol.
Features:
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- 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 | H₂S, CO, SO₂, NO₂, NH₃; Customized by customers | ||
| Detection principle | Customized by customers
Catalytic combustion、Electrochemistry、NDIR、PID, etc |
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| Sampling Method | Diffusion type or Pump suction(1L/min) | ||
| Measure Range | H2S: 0~100ppm, CO: 0~1000ppm, NOx:0~10ppm, SO2: 0~10ppm, 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:
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- Waste incineration plant, thermal power plant flue gas multi-pollutant on-site sampling inspection
- Metallurgical, smelting workshop toxic acid gas safety patrol inspection
- Municipal sewage treatment plant, sludge tank malodorous and toxic gas comprehensive monitoring
- Chemical factory, fertilizer plant mixed acid & alkaline waste gas leakage detection
- Environmental protection law enforcement industrial enterprises waste gas random sampling acceptance
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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




