Demeter Food Microbiology Media Preparation System

Demeter Food Microbiology Media Preparation System


Demeter™ is a highly innovative new system for food microbiology lab testing. Want higher lab productivity, increased test accuracy, and greater sample traceability?  If so, Demeter will automate the media preparation steps in the food testing process. There’s really nothing else like it on the market.


With Demeter, lab technicians have the flexibility to run multiple tests using different test media. Besides that, testing labs can eliminate the autoclave step used to heat and sterilize test media, improving lab productivity. Demeter heats and precisely dispenses sterilized water into food lab testing containers containing test media. Moreover, if the Demeter dispenses heated sterilized water directly into test containers containing pre-sterilized test media, labs can eliminate the autoclave step in the testing sequence. Using this approach, a food lab can potentially increase testing throughput by up to 7X.

Regardless of whether a lab uses pre-sterilized media or bulk media, Demeter precisely dispenses each and every test sample.  As a result, test accuracy improves significantly, and test-to-test variability essentially goes away.


Demeter tests for three common food pathogens: e coli, listeria, and salmonella. Most importantly, operators can program Demeter for up to 16 separate media recipes, and test dispenses from 90 mL to 4L. Besides that, three methods of sterilization-heat, UV treatment, and filtration-ensure that there’s no bacteria present in the testing process. Furthermore, test results are highly traceable.  The system features a bar code scanner that records sample information from each test into an internal buffer in the Demeter system. Besides that,this buffer can connect to a lab information management system (LIMS), streamlining the recordkeeping needed to maintain lab accreditation per ISO 17025:2005 standards.


Demeter uses the patented Heateflex heating coil, used to heat the sterilized test water. Power is 9.6kW, 208 VAC, 3-ph, 27 amp. Demeter dispenses heated water at 203ºF (95ºC), with an accuracy of +/- 2ºC. Test dispenses may be programmed for 90 mL to 4L, with up to 16 recipes available.


First, please view our Demeter product videos at the bottom of this page.

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

Finally,  Valin Corporation ( provided key vendor support in developing the Demeter system. 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 product development.

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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 17025:2005 lab inspection
  • Lab-specific customization through programmable recipes
  • Volumetric dispense accuracy with secondary weight confirmation


  • Heater: patented Heateflex heating coil
  • Power: 9.6 kW, 208 VAC, 3-ph, 27 amp
  • Dispense capability: 90 mL- 4L
  • Temperature: 203ºF (95ºC)
  • Temperature accuracy: +/- 2ºC (dependent on customer’s facilitation)
  • Dispense accuracy: +/- 2%
  • Scale accuracy: +/- 1%
  • Filtration: 3 filters, final filtration to 0.2 μm
  • UV lamp: 254 nm
  • Recipes: 16 recipes/dispenses for volume and heat
  • Thermocouple: NIST traceable
  • Communications: non-volatile data storage for the 100 most recent dispenses; interface to LIMS


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

  • e coli 0157: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- Trypicase Soy Broth
  • LB- Lactose Broth
  • Fraser Broth