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LD239 Helium Leak Detector

SKU: 2702-19340
Brand: GL Sciences
The Smallest, Lightest & Most Sensitive Leak Detector on the Market.

The LD239 is a compact handheld detector for portable detection of leak gases. The LD239 can accurately detect a wide variety of gases using a high-sensitivity thermal conductivity sensor and is especially useful for detecting Helium and Hydrogen tracer gas. Rapid awareness is possible with LD239's array of indicators including an LCD display, LED, and buzzer immediately alerting of any existing leaks.

• High-sensitivity thermal conductivity sensor
• Detected gases: helium, hydrogen, CO2, Ar, Ne, other non-corrosive gases
• Compact and lightweight design
• Rechargeable lithium-ion battery
• Multiple indicators: LCD display, LED, and buzzer
Your price: $1,494.00
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LD239 Helium Leak Detector SKU: 2702-19340



Portable & Handheld Helium Leak Detector 



The Smallest, Lightest & Most Sensitive Leak Detector On The Market

The LD239 is the smallest, lightest, and most sensitive gas detector available, precisely engineered to detect helium gas with a sensitivity of up to 0.0005mL/min. With dimensions of just 11 x 5 x 2 cm and a weight of only 95g, the LD239 offers true pocket-size convenience combined with high-sensitivity gas detection.

High-Sensitivity Thermal Conductivity Sensor

The LD239 Gas Leak Detector senses gases by comparing the difference in thermal conductivity between sampled gas and ambient air. Any gas with sufficient difference in thermal conductivity to the ambient air can be detected.


Thermal conductivity of some common gases [(mW/m*K) at 0 deg C, 1 atm]

Gas Thermal Conductivity Gas Thermal Conductivity Gas Thermal Conductivity
Hydrogen 168.2 Air* 24.1 Argon
Helium 142.2 Nitrogen* 24.0 Carbon
Neon 46.5 Ethane 18.0 Krypton
Methane 30.2 Ethylene 16.4 Xenon



At only 11 x 5 x 2 cm and weighing 95g, the LD239 provides true pocketable high-sensitivity gas detection.


Be immediately alerted of gas leaks from several easy-to-read and user-friendly indicators including an LCD display, LED lights, and a buzzer.


Get up to 5 hrs. use from the built-in Lithium-ion battery and easily recharge anywhere using the micro-usb port.

Typical Applications

The LD239 Gas Leak Detector can be used in a variety of applications, including:

  • Piping, valves and manifolds
  • Automotive components
  • Gas chromatography systems
  • Refrigerators
  • Heating and Ventilation units
  • Air Conditioners 
  • Safety

Trusted By Leading Companies 

Trusted By Leading Companies 



Detection Method Thermal conductivity
Target Gases Helium, CO2, Ar, Ne etc (gases that are largely different from referential gas)
※Not for flammable and corrosive gases
Sensitivity (He) [Standard range] 0.005mL/min at minimum [High range] 0.0005mL/min at minimum
Display LCD
Temperature Range 10 - 40 ℃
Battery Lithium ion battery installed, rechargeable through a USB port, 2.5 hours for a full recharge. 5 hour battery life with continuous use
Dimension 50 (W) x 20 (D) x 111 (H) mm
Weights 95g
Accessories USB cable (1M), Sample gas filter (probe built-in), referential gas filter (built-in), instruction manual, warranty certificate


Item Part#
LD239 Sample Filter
LD239 Reference Filter
LD239 Micro USB Battery Charging Cable




There are application notes for LD239 Helium Leak Detector.


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LD239 Helium Leak Detector
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