RS Korea — FIX800 O₂ with Stainless Steel Enclosure — Siheung Public Agency

FIX800 O₂ Detector Installation at Siheung Public Wastewater Treatment Facility

RS Korea completed the installation of a FIX800 fixed-type oxygen (O₂) concentration detector at a public institution's wastewater treatment plant in Siheung. The project involved mounting the detector in a stainless steel (SUS) enclosure with an integrated moisture-removal pre-conditioner, and running six SUS sampling pipes into the interior of the wastewater storage tank to enable continuous O₂ monitoring for confined-space worker safety prior to tank cleaning operations.

Installation Specifications

Confined-Space O₂ Monitoring: Key Hazard Characteristics and Engineering Considerations

• Oxygen-deficient atmosphere risk: Wastewater storage tanks with enclosed, greenhouse-like structures can accumulate biological off-gases that displace O₂, creating oxygen-deficient conditions (below 18% v/v) hazardous to workers during tank entry and cleaning.
• High-humidity environment: The warm, moist atmosphere inside a wastewater tank rapidly degrades unprotected electrochemical O₂ sensors; a moisture-removal pre-conditioner upstream of the FIX800 was therefore essential to ensure measurement accuracy and sensor longevity.
• Remote sampling via SUS piping: Because direct mounting of the detector inside the tank was impractical, six stainless steel sampling tubes were run from the tank interior to the externally mounted SUS enclosure, allowing safe and accurate gas extraction without exposing the instrument to aggressive wastewater vapors.
• Mechanical pipe protection: The thin-wall SUS sampling tubes were sheathed in a heavier steel channel or thick-wall pipe to prevent deformation if personnel accidentally step on them during maintenance activities.
• Calibration and pre-conditioning guidance: Upon completion, RS Korea briefed facility personnel on the moisture-removal pre-conditioner maintenance procedure and the recommended sensor calibration interval to maintain measurement traceability.

Frequently Asked Questions

Why is continuous O₂ monitoring necessary inside a wastewater storage tank?

Wastewater tanks are classified as confined spaces where biological decomposition can consume oxygen and produce toxic gases. Continuous fixed O₂ monitoring with the FIX800 allows operators to verify safe O₂ levels (≥18% v/v) before workers enter for cleaning or maintenance, preventing oxygen-deficiency incidents.

Why was a stainless steel (SUS) enclosure selected for this installation?

The high-humidity, chemically aggressive atmosphere at a wastewater treatment facility would accelerate corrosion of a standard enclosure. A SUS enclosure provides superior corrosion resistance and structural durability, ensuring long-term reliable operation of the FIX800 detector in this environment.

What role does the moisture-removal pre-conditioner play?

Electrochemical O₂ sensors are sensitive to excess moisture; condensation on the sensor cell can cause erroneous readings or premature failure. The pre-conditioner removes water vapor from the sampled gas stream before it reaches the FIX800 sensor, preserving measurement accuracy and extending sensor service life.

Why were six separate SUS sampling pipes installed rather than a single line?

The wastewater storage tank had multiple zones requiring O₂ surveillance. Six individual SUS sampling lines — each protected by a double-layer steel outer conduit — were routed to cover the tank interior comprehensively, ensuring representative gas sampling across the entire monitored volume.

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