FIX800 Multi-Gas Detector (NO₂/SO₂/CO/Ex) with Active Sampling Conditioning Skid (Seoul Gasan)

FIX800 Multi-Gas Detector with Sampling Conditioning Skid — NO₂ / SO₂ / CO / Ex

This delivery features a FIX800 configured with four simultaneous gas sensors in a single unit, paired with an active-sampling conditioning enclosure.

Measurement Configuration

• NO₂: 0–20 ppm
• SO₂: 0–20 ppm
• CO: 0–500 ppm
• Ex (flammable gas): 0–100% LEL

The system is configured for safety monitoring — detecting leaks and activating a beacon lamp while providing 4–20 mA analog outputs for integration with external control systems. All four gas readings are displayed simultaneously on the FIX800 screen.

FIX800 displaying four gas channels simultaneously

Sensor Selection and Configuration

The WANDI platform supports a wide range of sensor types and measurement spans, selectable from 1 to 4 sensor slots. With the CO+H₂S dual sensor, up to 5 gases can be measured simultaneously across 4 sensor slots.

Available sensor options and measurement ranges

Active Sampling Conditioning Skid

An internal suction pump actively draws ambient air to the sensors, providing faster response than passive diffusion — particularly important for leak detection in areas with limited air movement.

Active sampling pump assembly

Sampled air passes through a silica gel desiccant to remove moisture before reaching the sensors, enabling stable measurement in humid environments. The complete system is housed in a stainless steel (SUS) or high-density polymer (high-box) enclosure for simplified installation, mechanical protection, and weatherproofing against rain and snow.

SUS enclosure with sampling skid — front and side views

Frequently Asked Questions

Q1. How does active (pump) sampling differ from passive diffusion?

Passive diffusion relies on ambient air naturally reaching the sensor — simpler to install, but slower to respond. Active sampling uses a built-in pump to draw air directly to the sensor, providing faster detection and enabling monitoring at locations with limited natural airflow, such as inside ducts, pipes, or enclosed enclosures.

Q2. Why is silica gel pre-treatment necessary?

Electrochemical sensors can produce unstable readings or experience accelerated degradation when exposed to excessive moisture. Silica gel desiccant in the sampling line removes moisture to a controlled level, ensuring reliable measurement even in humid industrial environments.

Q3. Why monitor NO₂ and SO₂ together?

Both gases are commonly co-generated in combustion processes, chemical reactions, and exhaust streams. As both are regulated under Korea's OSHA as hazardous substances with defined TWA and STEL limits, monitoring them together in a single multi-gas unit is more efficient than deploying separate instruments for each gas.

Q4. What is the difference between SUS and high-box enclosures?

SUS (stainless steel) enclosures offer superior corrosion resistance and durability, making them suitable for outdoor installation or environments with chemical exposure. High-density polymer (high-box) enclosures are lighter and commonly used for indoor electrical panel configurations. Selection depends on site conditions including corrosivity, humidity, and mechanical impact risk.

Q5. How are the 4–20 mA outputs used?

The 4–20 mA output is an industry-standard analog signal compatible with PLCs, DCS, BMS, and SCADA systems. It allows gas concentration values to be integrated directly into existing plant control infrastructure, where they can be monitored alongside other process variables and used to trigger automated responses.

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