FIX800 Gas Monitoring System for Cold Storage Confined Spaces — Centralized O₂/CO₂ Monitoring (Gyeonggi-do / Gyeongsang-do)

FIX800 Gas Monitoring System Installation in Cold Storage Warehouses (O₂ / CO₂)

This case introduces the FIX800 gas detector installed in cold storage warehouses and the centralized monitoring system built using the instrument's communication outputs.

Confined Space Gas Management in Cold Storage

Human physiological response to CO₂ concentration:

Cold storage warehouses are designated confined spaces. Where dry ice is stored inside, continuous monitoring of both O₂ and CO₂ is essential. Normal atmospheric oxygen is approximately 21%; as CO₂ concentration rises — from dry ice sublimation or refrigerant leaks — oxygen is displaced proportionally, creating an oxygen-deficient hazard.

Human physiological response to oxygen concentration:

FIX800 Installation and Alarm Operation

FIX800 detectors installed inside the cold storage rooms provide real-time gas concentration monitoring. When measured levels exceed the preset alarm thresholds, the integrated beacon triggers audible and visual alarms.

Centralized Monitoring System via Communication Outputs

A key advantage of the FIX800 is its multiple communication signal outputs, enabling integration into a wide range of monitoring systems. Available outputs include RS-485, 4–20 mA analog, and relay contact signals.

Using these outputs, a centralized system was configured allowing operators in a single control room to monitor gas concentrations across six cold storage rooms simultaneously on one display.

Integration with a data logger is also available, enabling continuous data recording and long-term trend management. The FIX800's communication outputs support flexible, site-appropriate monitoring system configurations across a wide range of facility types.

Frequently Asked Questions

Q1. Why are cold storage warehouses classified as confined spaces?

Cold storage warehouses are sealed to maintain temperature, making natural ventilation difficult. Dry ice sublimation releases CO₂, and refrigerant leaks can displace oxygen. Under Korea's OSHA, these environments are designated confined spaces requiring gas concentration verification before worker entry.

Q2. Why monitor both O₂ and CO₂ in cold storage?

Rising CO₂ from dry ice or refrigerant leaks simultaneously reduces O₂, creating a compound hazard. Monitoring both gases together allows oxygen deficiency and CO₂ overconcentration to be managed in a single system, providing comprehensive protection.

Q3. How is a six-room centralized monitoring system configured?

Each FIX800 transmits RS-485 data to a central monitoring system in the control room. Multiple detectors are connected in a daisy-chain or star topology, allowing all rooms to be viewed simultaneously on a single display. This reduces staffing requirements and enables faster response to alarms.

Q4. What are the benefits of data logger integration?

Data loggers automatically record timestamped gas concentration readings for long-term storage. Logged data supports post-incident analysis, regulatory compliance reporting, and trend monitoring to identify gradual changes in storage conditions before they become safety hazards.

Q5. Are there special considerations for installing sensors inside cold storage rooms?

Electrochemical sensors may be affected by very low temperatures (below -30°C), potentially impacting accuracy and sensor lifespan. Low-temperature sensor options or sampling line heating accessories should be evaluated for extreme cold environments. Detector mounting locations should be selected near dry ice storage areas or refrigerant piping for earliest possible leak detection.

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