DEMETER™ Media Preparation System for Food Safety Labs

DEMETER Media Preparation System for Food Safety Labs

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).

Customer applications include pathogen testing for:

  • 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


“We anticipate that DEMETER will significantly increase the media preparation throughput in our testing labs . . . there’s really no other product quite like it on the market”

Dr. Roy Radcliff, CEO, Marshfield Food Safety, LLC



Product Brochure Video


  •  Automatically dispense sterile water with high precision, accuracy, and traceability for temperature & volume
  •  Increase lab throughput with quick, high capacity performance
  •  Skip media preparation autoclave step due to 0.2 μm filtration (ISO: 11133)
  • Procedural time savings entering incubator at incubation temperature
  • Sterilization of components prevent bacteria growth through 3 methods: heat, UV, & filtration
  • Documented traceability through system by streamlining audit procedure for yearly ISO/IEC 17025:2005 lab inspection
  • Lab specific customization through programmable recipes
  • Volumetric dispense accurately with secondary weight confirmation


  • Dispense volume accuracy: ±2 % (ISO 6887)
  • Weight accuracy: <1% within limits of detection of scale (ISO: 11133: 2014)
  • Temperature accuracy: <±2°C (Media manufacturers’ commonly recommended incubator
    temperature range)
  • 0.2μm final filtration allows elimination of autoclave step when used with sterile dehydrated media
    reagents (ISO: 11133: 2014)

Safety Interlocks

  • System
    • High pressure
    • Leaks detection
    • Disconnect switch
    • Tank low level
  • Heater
    • Fuses
    • Thermal fuse
    • High limit alarm
    • SCR fault alarm
    • Heater low level


  • Dispense capability range: 90mL – 4L
  • Heating module up to 94° C
  • 2 internal sterilization cycles: routine and intensive
  • 3 filters, final filtration to 0.2 μm
  • 16 recipes/dispenses for volume and heat (0-50° C)
  • UV lamp 254 nm
  • Barcode scanner
  • Scale ± 1% accuracy
  • LIMS interface
  • Non-volatile data storage for the 100 most recent dispenses
  • Dispense ± 2% volume accuracy & ± 2° C temp accuracy
  • Printer for data label records
  • NIST traceable thermocouple and scale
  • PP enclosure
  • 10 gal PVDF tank
  • 9.6 kW, 208VAC, 3 phase, 27 amp