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- InertSustain C18 First choice for ultra-high inertness and high durability, delivering superior peak shapes with low back pressure.
- Inertsil ODS-3 Most popular C18, trusted for long-established methods, offering strong retentivity and high loading capacity.
- InertSustain AQ-C18 First choice for high-polarity compounds, delivering strong retention even under 100% aqueous mobile phases.
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- InertSustainSwift C18 Ultra-inert, fast-separation C18 for high-throughput LC-MS and LC-MS/MS with superior peak symmetry.
- InertSustain AX-C18 Mixed-mode C18 with anion exchange for strong retention of highly polar acidic compounds without ion-pairing.
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- InertSustain C8 Ultra-inert C8 column for rapid analysis of hydrophobic compounds with symmetric peaks across a wide pH range.
- Inertsil C8 Ultra-pure silica C8 column for rapid analysis of hydrophobic compounds, ideal for legacy methods.
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- Inertsil C8-3 Strong retentivity, very inert, and low back pressure, based on the same silica and bonding as Inertsil ODS-3.
- Inertsil WP 300 Wide-pore C8 column for rapid, high-resolution separation of proteins and peptides with sharper peaks.
- Inertsil C4 Low-retentivity C4 column for rapid analysis of highly hydrophobic compounds like fat-soluble vitamins.
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- InertSustain Amide First choice for HILIC mode, offering the strongest retention of polar compounds with superior stability in water-rich conditions.
- Inertsil HILIC Diol-bonded HILIC column for excellent peak shape and strong retention of highly polar basic compounds.
- InertSustain NH2 First choice for sugar analysis, offering superior stability, reproducibility, and compatibility with weakly acidic eluents.
- Inertsil NH2 Aminopropyl column for sugar analysis, highly retentive in normal phase with superior stability and reproducibility.
- ProteoSil HILIC Bioseparation-focused HILIC column, excelling in hydrophilic compound, peptide, glycan, and oligonucleotide analysis.
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- InertSustain PFP A pentafluorophenyl-modified column designed for enhanced separation of structurally similar compounds through multiple retention mechanisms, including π-π, dipole, and hydrogen bonding interactions.
- InertSustain Phenyl A directly bonded phenyl group gives the InertSustain Phenyl column unique reversed-phase selectivity, ideal for separating polar compounds and structural isomers via π-π and hydrogen bonding interactions.
- InertSustain Phenylhexyl A phenylhexyl-bonded column that offers complementary selectivity to traditional alkyl-chain columns, providing high inertness, reproducibility, and low back pressure.
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- InertSep C18 Silica sorbent with high end-capping, ideal for lipid removal & pesticide residue analysis.
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- InertSep HLB Versatile SPE column for extracting non-polar to highly polar compounds, with a wide pH range (1-14).
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- MonoSpin C18 High-permeability spin column for peptide desalting, drug extraction, and fast biological sample preparation.
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- MonoSpin C18-CX Mixed-mode spin column with C18 and cation exchange for enhanced basic drug recovery.
- MonoSpin Phospholipid TiO₂/ZrO₂-coated spin column for efficient phospholipid removal and matrix effect reduction.
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InertSep QuEChERS Kit High-purity extraction and cleanup kit for pesticide residue analysis in food and environmental samples.
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Instruments
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LD249 Gas Leak Detector Compact, easy-to-use leak detector with thermal conductivity sensor for fast, accurate gas detection. Replaces the LD239. -
FM4: Air Sampler for PFAS Low-volume air sampler for PFAS enabling comprehensive analysis of both gas and particle phases in a single sampling using stage-optimized materials. -
Intelligent Pump UI-32 Series Next-generation dual-plunger HPLC pump with ultra-low pulsation and automated pressure control for flow chemistry. -
OralChroma Halitosis Measuring Device High-precision breath analyzer using gas chromatography to quantify VSCs in 4 minutes — fast, reliable, and maintenance-free.
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LD249 Gas Leak Detector Latest model replacing LD239, with thermal conductivity detection for helium, hydrogen, and other gases.
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GF1010 Digital Gas Flowmeter Portable, volumetric meter for accurate GC gas flow measurement without gas selection.
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Intelligent Pump UI-32 Series Next-generation dual-plunger HPLC pump with ultra-low pulsation and automated pressure control for flow chemistry.
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Intelligent Micro Pump MP-32 Series Compact micro pump with ultra-low pulsation and high-pressure stability, ideal for flow chemistry and precision dosing. -
Auto BPR BP-11 Auto Back Pressure Regulator for the UI-22 Series, maintaining stable pressure for consistent flow. -
PCS Pump SP-32 Series Single plunger pump with real-time pressure control and low-pulsation flow—ideal for precise fluid delivery. - All HPLC Pumps visible-xs
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Gastorr AG Series Reliable, CPU-controlled degassing system for low-flow applications with independent chamber design. -
Gastorr BG Series High-performance degassing system with real-time vacuum display and independent chamber design. -
Gastorr FG-42 Solvent degassing system optimized for fluorinated solvents with real-time vacuum display. -
Gastorr PG Series High-flow degassing system for fractionating applications with real-time vacuum display. - All Degassing Units visible-xs
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- HPLC Columns
- Sample Preparation
- GC Columns
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Instruments
-
LD249 Gas Leak Detector Compact, easy-to-use leak detector with thermal conductivity sensor for fast, accurate gas detection. Replaces the LD239.
-
FM4: Air Sampler for PFAS Low-volume air sampler for PFAS enabling comprehensive analysis of both gas and particle phases in a single sampling using stage-optimized materials.
-
Intelligent Pump UI-32 Series Next-generation dual-plunger HPLC pump with ultra-low pulsation and automated pressure control for flow chemistry.
-
OralChroma Halitosis Measuring Device High-precision breath analyzer using gas chromatography to quantify VSCs in 4 minutes — fast, reliable, and maintenance-free.
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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
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
LD239 Helium Leak Detector
SKU:
2702-19340
Brand:
GL Sciences
The LD239 Model is Now the LD249
The LD239 Helium Leak Detector has been upgraded to the new and improved LD249 model, offering enhanced features and better performance for a wide range of applications.
Discover the New LD249
Trusted by Leading Companies
Details
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 | 16.3 |
| Helium | 142.2 | Nitrogen* | 24.0 | Carbon | 14.5 |
| Neon | 46.5 | Ethane | 18.0 | Krypton | 8.7 |
| Methane | 30.2 | Ethylene | 16.4 | Xenon | 5.2 |
*Undetectable
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 |
Accessories
| Item | Part# |
| LD239 Sample Filter | 2702-19333 |
| LD239 Reference Filter | 2702-19334 |
| LD239 Micro USB Battery Charging Cable | 2702-19331 |
Applications
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Handheld Flow Meter for Gas Chromatography (GC)
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