Installation] Paju City water treatment field installation type complex gas meter FIX800 4GAS O2 CO H2S EX product installation

Fixed Multi-Gas Detector FIX800 4GAS Installed at Paju Sewage Treatment Plant

A fixed-type four-gas detection system (WANDI FIX800 4GAS) was successfully installed at a sewage treatment plant in Paju City, Gyeonggi Province, to prevent worker asphyxiation accidents in confined spaces. The installation covers two primary treatment facility areas, with detectors mounted at each zone's center and a centralized status board positioned at the basement-level entry point, in compliance with Korea's Occupational Safety and Health Standards (Chapter 10, Section 1, Article 618).

Installation Specifications

Confined-Space Gas Hazards at Water Treatment Facilities

• Korean occupational safety regulations (revised 2017) mandate simultaneous monitoring of five gases in confined spaces: O₂, CO, CO₂, H₂S, and EX. The FIX800 4GAS addresses four of these key hazards in a single wall-mounted unit.
• O₂ deficiency is not the only asphyxiation risk — toxic gases such as H₂S can cause chemical asphyxiation at extremely low concentrations (parts-per-million range), making multi-gas detection essential.
• Sewage treatment plants generate H₂S from biological decomposition in enclosed pump rooms, sedimentation basins, and dehydration rooms, making them high-risk confined spaces even when oxygen readings appear normal.
• The FIX800 status board provides a real-time visual readout at the B1F entry point: green display indicates all channels within safe limits; yellow display indicates sensor warm-up or communication loading; red display with audible and visual alarms activates when any channel exceeds the configured alarm threshold.
• Powering the status board alone brings the entire detector network online, simplifying operation and reducing startup errors.

Frequently Asked Questions

What gases does the WANDI FIX800 4GAS monitor at a sewage treatment plant?

The FIX800 4GAS simultaneously monitors oxygen (O₂), carbon monoxide (CO), hydrogen sulfide (H₂S), and combustible gases (EX / %LEL). These four channels address the primary asphyxiation and explosion risks present in confined spaces at sewage and wastewater treatment facilities.

Why is a multi-gas detector required rather than a single oxygen meter?

Korean Occupational Safety and Health Standards (Article 618) specify that workers entering confined spaces must measure multiple gas types, because toxic gases such as H₂S can be lethal at very low ppm concentrations even when oxygen levels remain normal. A single O₂ meter cannot detect H₂S, CO, or flammable gas accumulation.

What is the expected service life and maintenance schedule for the FIX800 sensors?

The electrochemical and catalytic combustion sensors installed in the FIX800 have an expected operational lifespan of two years, after which full sensor replacement is required. Annual calibration is recommended to verify measurement accuracy; calibration can be performed on-site or by shipping the unit to the service center, and certificates can be issued either as KOLAS-accredited reports or as WANDI brand calibration certificates.

What does the %LEL reading on the EX channel mean?

%LEL stands for percent of the Lower Explosive Limit. It expresses the concentration of a combustible gas as a percentage of the minimum concentration at which that gas can ignite. A reading of 100 %LEL means the gas concentration has reached its ignition threshold; industry practice is to alarm at 10–25 %LEL to provide a safe warning margin before an explosive atmosphere develops.

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