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Gas Chromatography

Gas Chromatography
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Application Note MFD Gas Chromatography Precise Gas Flow Control within Gas Chromatography Systems Higher peak resolution with Axetris Mass Flow Solutions Gas Chromatography (GC) is one of the most important analytical techniques for analyzing compounds that can be transformed to a gaseous phase. A precise and stable gas flow control is essential at different locations within a GC system, in order to achieve high resolution peaks. Axetris offers a range of high-performance mass flow solutions to leading GC producers worldwide. Precise gas flow control a must to achieve GC performance A typical GC setup consists of a sampler, GC column, and a detector. Gas flow control within each of these elements brings with it specific challenges. Sampling Systems Examples: Head space, Purge-and-Trap (P/T) and Thermal desorption. Requirements: • Excellent repeatability for reliable results. • High turndown ratio and dynamic range for sampling mode flexibilty (e.g. during sampling and purging). Carrier Gas Control Examples: Typical GC carrier gases such as He, N2 or H2. Requirements: • Excellent repeatability ensures peak resolution. • Quick response time for integration with pressure-based flow control systems. • Multigas capability for flexibility in carrier gas selection. Detector Gas Control Examples: Flame Ionization (FID), Thermal Conductivity (TCD), Atomic Emission (AED, and Mass Spectrometers (MS). Requirements: • High accuracy for reliable measurement performance. • Excellent repeatability to eliminate detector drift. Precise gas flow control in a GC is a prerequisite for achieving high peak resolution and detection performance. Axetris MFC Advantages: Extremely high repeatability of < 0.15% Of Excellent turndown ratio > 1000:1 provides flexibility in flow range selection Quick response time of < 150 ms, e.g. for integration with pressure control systems Flow Control in Gas Chromatography Systems Flow Control Flow Control Sample Preparation (Head Space, Purge- and Trap..) Flow Control Detector Injector Column Split / Splitless Data system © by Axetris AG, Switzerland, infographics

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Company of the Leister Group OEM Mass Flow Meters • MFM 2020 Performance benefits at a glance: Pressure Coefficient < 4 ms (mass flow sensor) < 150 ms (mass flow controller) About Axetris Mass Flow Meters and Controllers Axetris offers OEM mass flow meters (MFM) and controllers (MFC) which offer outstanding value to the customer. The proprietary, platinum-based MEMS chip technology guarantees excellent accuracy and repeatability in combination with high speed and an extended dynamic range. The Axetris mass flow technology is used by many leading companies in the fields of gas...

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