CONSTRUCTION CASE

The Key to Preventing Confined-Space Asphyxiation Accidents! Ensuring Safety with the Wandi FIX800 Installed 4-Gas Detector and Concentration Display Board

Busan · 2025.11.11

Applied Markets

Safety

Installed Gases

CO (Carbon Monoxide) O2 (Oxygen) H2S (Hydrogen Sulfide) CO2 (Carbon Dioxide)

Project Details

Underground Confined Spaces — The Invisible Danger!

The Importance of Measuring 4 Gases (O2, CO, H2S, CO2) and the Wandi FIX800 Installed Gas Detector

Underground confined spaces (manholes, sewer pipes, septic tanks, pump stations, etc.) are places with a very high risk of asphyxiation and poisoning accidents due to oxygen deficiency and hazardous gas leaks.
In particular, most of the confined-space asphyxiation accidents that recur every year are caused by unchecked gas concentrations and neglected measurement.

For this reason, the Confined Space Work Program mandates that gas concentrations must be measured before, during, and after work, with immediate evacuation required if an abnormality is detected.

<Confined Space Work Program — Gas Concentration Standards and Guidelines>

Measurement Item Allowable Standard (Permissible Work Concentration) Key Hazard

  1. Oxygen (O2) Below 18% → work prohibited, 18–23.5% → normal Risk of asphyxiation from low oxygen
  2. Carbon Monoxide (CO) Work prohibited above 50 ppm Colorless and odorless, hard to detect, causes poisoning
  3. Hydrogen Sulfide (H2S) Work prohibited above 10 ppm Highly corrosive, causes olfactory paralysis and breathing difficulty
  4. Carbon Dioxide (CO2) 1.5% or above → work restricted, 3% or above → work prohibited Causes respiratory difficulty and impaired consciousness


Why an Installed Gas Detector Is Necessary

A single measurement with a portable detector makes it difficult to track real-time changes in on-site risk.
Because hazardous gas levels inside a confined space can suddenly increase, or oxygen can rapidly decrease,
an installed gas detector capable of continuous monitoring is essential.

가스측정기 전문 완디코리아 WANDI®가스측정기 전문 완디코리아 WANDI®

가스측정기 전문 완디코리아 WANDI®가스측정기 전문 완디코리아 WANDI®



Wandi FIX800

Installed 4-Gas Detector (O2 / CO / H2S / CO2 configuration)

The Wandi FIX800 is an installed 4-gas composite detector that can be used in various confined spaces such as industrial sites, septic tanks, and wastewater treatment plants.

  • O2 / CO / H2S / CO2 — simultaneous measurement of all four gases

  • Large digital display for excellent on-site visibility

  • Automatic alarm system: visual and audible alerts when concentration limits are exceeded

  • Concentration display board integration available → real-time monitoring from outside the space

  • RS485 / 4-20mA communication support for integration with a central control room

    The gas concentration display board works together with the installed detector
    to let personnel check the real-time concentration of each gas from outside the space at a glance.
     

  • Displays O2 / CO / H2S / CO2 concentrations

  • Outputs LED warning and buzzer alarm when concentration limits are exceeded

  • Supports remote monitoring from a central control room

    This allows workers' safety status to be checked immediately from outside, without anyone having to enter the space.

  • 가스측정기 전문 완디코리아 WANDI®
    가스측정기 전문 완디코리아 WANDI®


     


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