What does WANDI Korea do?

WANDI Korea is the official Korean distributor of WANDI environmental and gas measurement instruments, operated by RS Korea Co., Ltd. We provide sales, calibration, repair, installation, and technical support for portable and fixed multi-gas detectors and air quality monitoring systems, exporting to more than 20 countries with over 5,000 delivery records.

What products do you offer?

We supply portable multi-gas detectors (EDW100, EDW500, Gas Tiger series), fixed multi-gas detectors (FIX800, FIX900, FIX-AP), air quality monitoring systems (FIX5000), and gas leak detectors (GLD series) for industrial safety and environmental measurement.

Which gases can be measured?

Our instruments measure oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S), combustible gases (EX), carbon dioxide (CO2), ammonia (NH3), and volatile organic compounds (VOC), among other hazardous and combustible gases found on industrial sites.

Do you provide calibration and repair services?

Yes. Beyond product sales, WANDI Korea provides in-house and national certified calibration, repair, installation, and ongoing technical support. Calibration and repair requests can be submitted through the quote/calibration/repair pages on our website.

How can I get a quote for a gas detector?

You can request a quote directly through the quote page on our website or through a nearby dealer. Let us know your application and target gases, and we will recommend a suitable model.

In which fields are the products used?

They are used across a wide range of industrial sites including laboratories, factories and plants, hospitals, military facilities, livestock and wastewater treatment, and construction sites for worker safety and environmental monitoring.

FIX800 Wireless Remote Gas Monitoring System for Tunnel Construction Confined Spaces

FIX800 Wireless Gas Monitoring System for Tunnel Construction Sites

Underground tunnels under construction — including subway and road tunnels — are classified as confined spaces under Korean law. During the early stages of construction, mobile communication is unavailable inside the tunnel, making a reliable gas detection and remote monitoring system essential for rapid emergency response.

System Configuration

Hazardous gases generated during blasting or welding operations are detected inside the tunnel by fixed gas detectors.
Measured concentration values are transmitted via wired RS-485 connection to a wireless access point (AP).
The AP forwards the data to a server, enabling real-time remote monitoring via smartphone or PC.

Each detector requires only a power supply and two RS-485 communication wires connected to the router to begin operation.

Gases Monitored and On-Site Alarms

The system continuously monitors the four essential confined-space gases — O₂, CO, H₂S, and combustible gas (LEL) — in real time from inside the tunnel. Readings are transmitted remotely, and local audible and visual alarms are also triggered at each detector when concentrations exceed set thresholds.

Prerequisites

LAN infrastructure and a router must be installed inside the tunnel before gas detector installation can proceed. Readings from multiple detectors are aggregated through a single wireless AP unit — this portion of the system uses wired cabling.

A wireless AP unit is then positioned in a location with active network connectivity — inside or outside the tunnel — to relay concentration data to the server. Where Wi-Fi is already active inside the tunnel, the wireless AP is not required; gas data can be transmitted by simply assigning an IP address to the detector. A server must be available to receive the data, which can then be forwarded to a smartphone application or a remote control room.

Frequently Asked Questions

Q1. Why are tunnel construction sites designated as confined spaces?

Tunnels have limited natural ventilation and generate CO, H₂S, and combustible gases from blasting, welding, and diesel equipment. Oxygen levels can also fall below safe limits. Korea's OSHA designates active tunnel construction sites as confined spaces, requiring pre-entry gas checks and continuous monitoring.

Q2. Which gases must be monitored in a tunnel?

The four essential gases are O₂ (oxygen), CO (carbon monoxide), H₂S (hydrogen sulfide), and LEL (flammable gas). Blasting can also generate nitrogen oxides (NOx), so the sensor configuration may be expanded depending on site-specific hazards.

Q3. How does remote monitoring work when there is no mobile signal inside the tunnel?

Detectors transmit data via wired RS-485 to a wireless AP inside the tunnel. The AP relays the data over Wi-Fi or LTE to an external server, which then pushes real-time concentration values to a smartphone app or control room PC.

Q4. Is it possible to build the system without a wireless AP?

Yes, if Wi-Fi is already active inside the tunnel. In that case, assigning an IP address directly to each detector is sufficient for network connectivity. A server to receive and store the data is still required regardless of the communication method.

Q5. What preparatory work is needed before detector installation?

Power supply cabling and LAN infrastructure (including a router) must be installed inside the tunnel before the gas detectors can be commissioned. Planning the gas monitoring system during the overall construction design phase — rather than as an afterthought — prevents installation delays later.

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