Defender 520M Calibrator

Product Image of Defender 520M Calibrator

The Bios Defender 520 Calibrator has the ability to take volumetric readings, adding to the line of DryCal primary flow calibrators. Automatic correction of readings for temperature and pressure, rather than merely recording of ambient conditions is essential in many applications.

The Defender 520 provides users with a true primary flow calibrator for industrial hygiene, environmental, and laboratory applications.

Defender primary flow meters are designed to provide light weight ultra-compact size, incorporating the industry leading DryCal technology. Building on the patented DryCal near-frictionless piston technology, the Defender 500 series incorporates features to make it immune to flow source pulsation without the need for in-line dampers.

The Defender 520 is easy to use.  Turn it on. Connect it to a sampling pump. Start taking readings. It's as simple as that. Calibrations within a minute with no messy soap bubble solutions to wait on or clean up.


  • Proven percent of reading accuracy is supported by ISO 17025 accreditation by NVLAP of NIST
  • Integrated temperature sensors and pressure transducers placed directly in the flow stream for optimum standardized results
  • Defender 520 ±1% of reading volumetric, includes temperature and pressure recording


  •  Housed in a molded case with rubber handgrips for a better feel and a sleeker, more contemporary look
  •  Large illuminated flow cell viewing window
  •  Navigation menu and a large, illuminated graphical display with zoom feature
  •  Rated for extreme cold operation, down to -20 ºC
  •  RoHS (Restriction of Hazardous Substances) compliant for Europe
  •  Automatic Shutoff


  •  Choose between flow units
    • Volumetric: mL/min, L/min, cc/min, or cf/min
  •  Include up to one hundred readings in a group average
  •  Take individual readings, continuous hands-free readings, or set to read in time intervals anywhere from one minute to sixty minutes between readings

Flow Range - Medium

  • 50-5,000mL/min

What Is Included

  • Instrument
  • Serial Cable
  • 100-240V AC Power Adapter/Charger with US Plug Configuration
  • Plastic Leak Test Caps (2)
  • NIST-Traceable Calibration Certificate
  • Mini-Manual and Instructions for downloading the free DryCal Pro

Defender 520M Calibrator
Item # 520M 

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