FIX800 4-Gas Confined-Space Detector Delivery — GTX Tunnel Construction Site (Location Confidential)

FIX800 4-Gas Detector Delivery — GTX Tunnel Construction Site (3 Work Zones, Location Confidential)

WANDI's FIX800 fixed gas detector is capable of measuring the 4 gases required by Korea's Occupational Safety and Health Act — O₂, CO, H₂S, and EX — in a single instrument, making it widely deployed at construction sites nationwide.

This delivery was to a construction firm responsible for GTX tunnel work. Multiple construction companies are active across different sections and work zones of the project, and WANDI products have been installed across several of these sections.

Previous Installation — GTX Tunnel Vertical Shaft Gas Monitoring

Construction company, work zone, and section details are not disclosed for security reasons. The following photos are from an initial installation completed in autumn 2021.

An LED display board was installed near the hoist of the tunnel vertical shaft, allowing workers to check gas concentrations before descending into the tunnel. Inside the tunnel, a 4-channel split display with beacon alarm provides continuous real-time concentration monitoring and hazard alerts.

This Delivery — Product Training and Post-Delivery Follow-Up

This was a different section with a different contractor. Given schedule and cost considerations, the scope was delivery only — not installation. The kit consisted of detector + display board + communication cable.

After a full incoming inspection of all items, power was supplied using a portable battery and approximately 20–30 minutes of product training was conducted with the site manager.

Two months after delivery, a follow-up call confirmed no abnormalities or unusual issues during use.

Frequently Asked Questions

Q1. Why are fixed gas detectors required at GTX tunnel construction sites?

Tunnel excavation is among the most hazardous confined-space work environments. Blasting and drilling generate CO and CO₂; underground strata can release CH₄ and H₂S. In poorly ventilated spaces like vertical shafts, gases can accumulate to dangerous levels in a very short time — making continuous fixed monitoring essential.

Q2. Why is the display board installed near the vertical shaft hoist?

The vertical shaft hoist is the sole entry point to the tunnel interior. Positioning the display board at this location forces workers to check gas concentrations before descending — preventing anyone from entering when hazardous conditions exist, even if they haven't been notified by alarm.

Q3. Why do different contractors on different work zones choose the same WANDI products?

On large infrastructure projects, the client may specify standardized safety equipment across the project, or proven products naturally spread across sections through information sharing between site managers. FIX800's ease of installation, 4-gas simultaneous monitoring, and display board integration make it a preferred choice across construction environments.

Q4. How is correct installation ensured when only delivery — not installation — is provided?

At delivery, the site manager receives a 20–30 minute training session covering installation method, wiring, alarm threshold settings, and calibration procedure. A follow-up contact at approximately 2 months post-delivery verifies that there are no issues in operation and provides remote support if needed.

Q5. How is a 4-channel split display board configured?

A 4-channel display board receives data from up to 4 FIX800 detectors connected via RS-485, displaying each unit's gas concentration, unit, and alarm status simultaneously on a divided screen. Adding the beacon alarm option enables visual and audible simultaneous alerts whenever any channel exceeds its configured threshold.

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