Product Overview:
OC-850 portable 4-in-1 toxic gas detector is a professional monitoring instrument designed for simultaneous measurement of CO(Carbon Monoxide), NO₂(Nitrogen Dioxide), O₃(Ozone), H₂S(Hydrogen Sulfide).
It supports natural diffusion sampling and optional 1L/min pump suction sampling, applicable to collect gas samples from boiler flue pipes, disinfection workshops, sewage tanks, chemical exhaust pipelines and closed operating spaces. Imported anti-corrosion electrochemical sensors maintain stable detection accuracy under corrosive, oxidizing and damp complex gas environments.
Equipped with explosion-proof certification and IP65 protection grade, matched with LCD real-time concentration display, triple alarm system and automatic data recording function. Low power consumption and stable operation, widely used in thermal power plants, disinfection engineering, sewage treatment industries, chemical plants and environmental monitoring inspection work.
Features:
- Supports 1–5 gas combinations, customizable by user needs
- Compatible with Electrochemical, NDIR, PID, and catalytic sensors
- Dual sampling modes: Pump suction (1L/min) & Diffusion
- High precision industrial-grade gas sensors
- Fast response time ≤10 seconds
- LCD display showing gas concentration, status, and alarms
- Explosion-proof design (Exia II CT4)
- IP65 protection, suitable for harsh environments
Multiple alarm modes: sound, light, and vibration

Technical Specification:
| Gas Detected | CO(Carbon Monoxide), NO₂(Nitrogen Dioxide), O₃(Ozone), H₂S(Hydrogen Sulfide). | ||
| Detection principle | Electrochemical Sensor | ||
| Sampling Method | Diffusion type or Pump suction(1L/min) | ||
| Measure Range | CO: 0~1000ppm, NO2: 0~100ppm, O3: 0~5ppm, H2S: 0~5ppm, Support customized | ||
| Resolution | CO: 0.1ppm, NO2: 0.01ppm, O3: 0.01ppm, H2S: 0.01ppm | ||
| 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 plants, boiler rooms flue gas CO and NOx emission concentration monitoring
- Hospital disinfection workshop, water treatment ozone disinfection residual gas concentration detection
- Sewage treatment plant pipeline H2S toxic gas leakage and overflow risk inspection
- Chemical factory workshop toxic and oxidizing gas routine safety patrol monitoring
- Environmental protection department law enforcement sampling, industrial waste gas pollution source inspection
- Ultraviolet disinfection workshop, food sterilization workshop ozone excess safety monitoring
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





