Imspex Diagnostics Ltd.

- Model VDK - Diacetyl and Pentandione Measurement Instrument


Diacetyl and pentandione (VDK) are by-products of the beer brewing process whose concentration needs to be controlled during brewing. Traditionally, GC-ECD has been the analytical technique of choice for this monitoring, as it affords the sensitivity needed in these measurements. IMSPEX’s diagnostics FlavourSpec® is an instrument based on GC-IMS (Gas Chromatography – Ion Mobility Spectrometry) which affords the sensitivity and reproducibility needed by this analysis, whilst presenting a series of significant advantages which make it ideal for the beer brewing industry

FlavourSpec is able to measure diacetyl and pentandione (VDK) in full automation.

  • Sample preparation is handled by the CTC sample changer and oven integrated into the FlavourSpec®
  • Diacethyl and pentandione levels are automatically calculated without user intervention, so that a non expert user can run the analysis
  • The instrument is rugged and can be placed anywhere in the brewery, as all it needs to run is electricity and an air cylinder (no vacuum pump, no helium)
  • Reduce your analytical instrument purchase cost and cost of ownership, increase your analysis speed and simplify your analysis

FlavourSpec shows many benefits when compared to alternative analytical instruments:

  • Ionization source below EUROATOM radiation level so no bureaucracy or permits
  • No helium (carrier gas in Nitrogen) means it is cheaper to run and no scarcity issues
  • Runs at atmospheric pressure therefore does not need a vacuum pump
  • Avoids costly breakdowns which can disrupt analytical function
  • No noise
  • More energy efficient
  • Faster analysis – 20 minutes run time means increased ROI (more analyses per time unit)
  • Sample preparation is fully automated so no skills needed from operator
  • Analysis is fully automated so no skills needed from the operator
  • Able to measure hops and flavouring agents in positive mode – QC/QA of ingredients from the same instrument

The FlavourSpec VDK has been specially optimized to to quantify levels of Diacetyl and pentandione (VDK) in the beer brewing process.

  • Working Principle Ion Mobility Spectrometry (IMS)
  • Ionisation ß-radiation source (Tritium (3H))
  • Activity 300MBq, below the exemption limit of 1GBq, EURATOM guideline
  • Drift Voltage Polarity Positive and negative, switchable
  • Sampling Automatic GC headspace injector
  • Detection Limit Low ppbv
  • Dynamic Range 1-3 orders of magnitude
  • Display 6.4″ TFT, VGA display
  • Input Unit Rotary pulse encoder
  • Processor 400 MHz X-scale
  • Data Acquisition Ultra-fast-ADIO-board
  • Data Processing X-board / Baseboard
  • Data Storage 2-GB Compact-Flash
  • Communication RS232, USB, Ethernet
  • Electrical Connectors 2 x D-Sub 9-pole (for modem,
  • console), D-Sub 15-pole (for external devices), RJ45 (for
  • digital modem or SSH), 2 x USB-A
  • Power Supply 100-240 V AC, 50-60 Hz (external supply),
  • 24 V DC / 5A, XLR-connector (internal)
  • Power Consumption < 180 Watt
  • Dimensions 449 x 375 x 177 mm (WxDxH)
  • Weight 15.5 kg
  • Housing 19″ compatible, IP 20 enclosure, EMC certificated
  • Gas Connectors 3 mm stainless steel Swagelok connectors
  • for gas in- and outlet

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