GasTiger 2000 THT Odorant and Toxic Gas Measurement — LNG/LPG Leak Detection and Desulfurization Monitoring (Gyeonggi-do)

GasTiger 2000 — THT Odorant and Organic Compound Measurement

This article covers the GasTiger 2000 configured for measurement of THT (tetrahydrothiophene) odorant and related organic compounds.

GasTiger 2000 — Toxic Gas Detector

The GasTiger 2000 is capable of measuring a wide range of toxic gases. The internal pump has been upgraded to draw 1 L/min reliably, ensuring representative sampling across diverse environments.

What Is THT (Odorant)?

① LNG (liquefied natural gas)
LNG supplied to homes and businesses has been purified to remove dust, sulfur, nitrogen, and other impurities — making it colorless and odorless by nature. Because odorless gas leaks cannot be detected by smell, distributors add a trace amount of THT as an odorant marker so that leaks can be perceived before they become dangerous.

② LPG (liquefied petroleum gas)
When LPG is used as a fuel source for fuel cells, removal of THT from the fuel stream is mandatory, as the sulfur compound poisons the reforming catalyst and degrades fuel cell performance.

In everyday LNG supply, sulfur-based odorants are blended into the gas. A leak is typically detected first by the strong sulfur smell of the odorant — well before the methane itself reaches hazardous concentrations.

Only approximately 13–14 mg/m³ of THT is injected — a concentration considered safe for human exposure under normal conditions. However, sulfur compounds can cause corrosion in process equipment, which is why plants invest in desulfurization systems to remove them.

Since THT measurement is used to confirm gas leaks or monitor odorant presence, the alarm function should be actively configured and used for management purposes.

Supported Gas Sensors

Beyond THT, the GasTiger 2000 supports a wide range of toxic gas sensor options, including phosgene (COCl₂), toluene (C₇H₈), VOCs, hydrogen fluoride (HF), hydrogen sulfide (H₂S), ammonia (NH₃), hydrogen (H₂), and others.

Frequently Asked Questions

Q1. What exactly is THT (odorant)?

THT (tetrahydrothiophene) is a sulfur-based organic compound added in trace amounts (approximately 13–14 mg/m³) to colorless, odorless combustible gases such as LNG and LPG. Its strong sulfur odor allows people to detect gas leaks by smell. At the concentrations used as an odorant, THT is considered safe for human exposure.

Q2. Why must THT be removed when using LPG in fuel cells?

Fuel cells use reforming catalysts to extract hydrogen from LPG. The sulfur content in THT poisons these catalysts, causing rapid loss of catalytic activity and degraded fuel cell performance. THT must be removed by a desulfurization system before the fuel reaches the reformer, and residual concentration must be measured and managed continuously.

Q3. What measurement range is used for THT detection with GasTiger 2000?

Typical THT sensor configurations cover 0–100 ppm or 0–200 ppm, depending on the application. The appropriate range depends on the context — residual monitoring downstream of a desulfurization unit versus general leak detection in a distribution network. Consult a specialist before ordering to select the correct span for your site conditions.

Q4. Why is sulfur compound monitoring important in desulfurization systems?

As the adsorbent in a desulfurization unit approaches saturation, sulfur compounds begin to break through to the downstream side. Installing THT or H₂S detectors at the inlet and outlet allows operators to accurately identify when the adsorbent needs replacement, maintaining system efficiency and downstream product quality.

Q5. How many sensors can be installed simultaneously in GasTiger 2000?

Up to four gas sensors can be installed at the same time. THT can be combined with H₂S, NH₃, VOCs, toluene, and other sensors to monitor multiple gases simultaneously in a single portable instrument.

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