Demeter™ Food Microbiology Media Preparation System

Demeter Food Microbiology Media Preparation System

The Demeter™ is a highly traceable food microbiology testing lab instrument that automates the media preparation steps in the food testing process, resulting in both higher lab productivity and increased testing accuracy. Demeter delivers versatile flexibility for a lab, allowing it to run multiple tests with different media, and eliminating the need for an autoclave to heat and sterilize the test media. The system features a bar code scanner that records sample information from each test into an internal buffer that can be interfaced to a lab information management system (LIMS). This feature streamlines the recordkeeping needed to maintain yearly lab accreditation per ISO 17025:2005 standards, and to the increased regulatory compliance resulting from the passage of the Food Safety Modernization Act (FSMA).

Key vendor support in developing the Demeter system was provided by Valin Corporation (  Valin selected the Omron PLC and HMI hardware used to interface with the Demeter system components, and assisted with the subsequent programming needed for a successful development.

Read the article here from the April/May 2018 edition of Food Quality & Safety magazine to see how one food testing lab has used the Demeter system to increase their testing productivity.

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  • Automatically dispense sterile water with high precision, accuracy, and traceability for temperature and volume
  • Increase lab throughput with quick, high capacity performance
  • Procedural time savings entering the Incubator at Incubation temperature
  • Sterilization of components prevents bacteria growth through 3 methods: heat, UV, and filtration
  • Documented traceability throughout the system streamlines the audit procedure for yearly ISO/IEC 17025:2005 lab inspection
  • Lab-specific customization through programmable recipes
  • Volumetric dispense accurately with secondary weight confirmation


  • Heater: Patented Heateflex® Coil
  • Power: 9.6kW, 208VAC 3ph, 27amp
  • Dispense Capability: 90ml – 4L
  • Temperature: 203°F (95°C)
  • Temperature Accuracy ±2°C (Contingent on Customer’s Facilitation)
  • Dispense Accuracy ±2% (Contingent on Customer’s Facilitation)
  • Scale Accuracy: ±1%
  • Filtration: 3 Filters, Final Filtration to 0.2 µm
  • UV Lamp: 254nm
  • Recipes: 16 Recipes/Dispenses for volume and heat
  • Thermal Couple: NIST Traceable


  • LIMS Interface
  • Non-volatile data storage for the 100 most recent dispenses


Ideal Applications include environmental, food microbiology, and food manufacturing QA/QC labs conducting pathogen testing for the following:

  • E Coli O157:H7
  • Listeria
  • Salmonella

Demeter assists in automating media preparation with many media reagents including the following:

  • BPW – Buffered Peptone Water
  • BPBW – Butterfield’s Phosphate Buffered Dilution Water
  • TSB – Trypticase Soy Broth
  • LB – Lactose Broth
  • Fraser Broth