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 Fixed HCl (Hydrogen Chloride) Detector — Post-Scrubber Low-Concentration Monitoring (Yeosu)

FIX800 Fixed HCl Detector — Post-Scrubber Low-Concentration Monitoring (Yeosu)

This article covers a FIX800 fixed gas detector configured for HCl (hydrogen chloride) measurement in an industrial facility in Yeosu.

About Hydrogen Chloride (HCl)

HCl is used across semiconductor fabrication, chemical manufacturing, pharmaceutical production, and food processing — and requires continuous monitoring wherever it is handled.

Occupational Exposure Limits

HCl can cause adverse health effects at concentrations as low as 1 ppm. Accurate low-concentration measurement is therefore essential wherever HCl is present.

TWA: Time-weighted average over an 8-hour workday
STEL: Short-term exposure limit

Application — Post-Scrubber HCl Measurement

This installation measured residual HCl downstream of a scrubber. A low-range sensor (0–10 ppm) was used together with a moisture pretreatment unit to ensure measurement accuracy in the humid post-scrubber gas stream.

The FIX800 uses diffusion-based sampling at the detector head, and can be configured with various pretreatment assemblies to suit site conditions. RS-485 and 4–20 mA outputs are available for integration with existing control systems.

This low-range configuration provides a resolution of 0.01 ppm — necessary for reliable measurement at the trace concentrations expected after scrubbing.

1/4" SAE Port — Sample and Exhaust Connections

The control enclosure is fitted with 1/4" SAE ports for sample inlet hose and exhaust tubing connections.

Supported Toxic Gas Sensors

Beyond HCl, the FIX800 supports sensors for HF (hydrogen fluoride), F₂ (fluorine), Cl₂ (chlorine), HCN (hydrogen cyanide), and many other toxic gases — allowing the same platform to be reconfigured as hazard profiles change.

Frequently Asked Questions

Q1. Why is HCl measured downstream of a scrubber?

Scrubbers remove HCl from process exhaust. Measuring residual HCl at the scrubber outlet confirms treatment efficiency in real time and triggers alarms if breakthrough occurs — protecting both air quality compliance and downstream personnel.

Q2. Why is moisture pretreatment required for HCl measurement?

HCl dissolves in water to form hydrochloric acid, which corrodes tubing and sensor components. Moisture also distorts electrochemical sensor readings. Drying the sample gas through a pretreatment unit before it reaches the sensor is essential for stable, accurate measurement.

Q3. Why is 0.01 ppm resolution needed?

With a TWA of 1 ppm and post-scrubber residual concentrations often below 0.1 ppm, meaningful measurement in this range requires sub-0.1 ppm resolution. A 0.01 ppm resolution sensor provides the precision needed to distinguish compliant from non-compliant conditions at trace levels.

Q4. How are the RS-485 and 4–20 mA outputs used?

RS-485 allows multiple detectors to share a single communication bus connected to a central DCS, PLC, or HMI. The 4–20 mA analog output provides a current-loop signal that integrates directly with existing instrumentation systems — no additional hardware required.

Q5. Can the same FIX800 measure other acid toxic gases?

Yes. The FIX800 accommodates up to 4 sensor slots, allowing HCl to be combined with HF, Cl₂, HCN, and F₂ sensors as required. For highly adsorptive acid gases, each gas type requires appropriate pretreatment — consult a specialist when specifying multi-gas acid configurations.

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