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Mesa Labs Defender Primary Flow Meter Mesa Laboratories Get Quote



Mesa Labs Defender 510 and Defender 520 are the next generation of the DryCal® DC-Lite and DryCal® DC-2 flow Calibrators.

Everything you trusted about Mesa Labs DryCal® technology in the DC-Lite and DC-2 digital flowmeters is available in the Defender 510, 520 & 530 calibrators that make it easier than ever to calibrate air sampling pumps. Measure volumetric flow, standarized flow, which correct for temperature and pressure, or calibrate devices that read in mass flow.

Mesa Labs Defenders are true primary flow meters 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.

Like all Mesa Labs calibrators, the Defender calibrator 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 after.

The Defender 510, 520 and 530 can take hands-free continuous readings while quickly and accurately setting the flow rate on air sampling pumps or other instruments. The Defender calibrators connect to any PC and pre- and post-calibration data can be downloaded with the included Optimizer Collect Light software.

Key Features

  • Include up to one hundred readings in a group average
  • Choose between flow units – mL, L, cc, or cf
  • Automatic Shutoff
  • RoHS (Restriction of Hazardous Substances) compliant for Europe
  • Rated for extreme cold operation, down to -20 ºC
  • Navigation menu and a large, illuminated graphical display with zoom feature
  • Large illuminated flow cell viewing window
  • Housed in a molded case with rubber handgrips for a better feel and a sleeker, more contemporary look
  • Integrated temperature sensors and pressure transducers placed directly in the flow stream for optimum standardized results recording (Bios Defender 520 & 530)
  • Take individual readings, continuous hands-free readings, or set to read in time intervals anywhere from one minute to sixty minutes between readings
  • Proven percent of reading accuracy is supported by ISO 17025 accreditation by NVLAP of NIST

Technical Specifications

Flow Range: DryCal Defender Low (L) Flow: 5 to 500 mL/min
Flow Range: DryCal Defender Medium (M) Flow: 50 - 5,000 mL/min
Flow Range: DryCal Defender High (H) Flow: 300 - 30,000 ml/min
Accuracy: Volumetric (Defender 510 or 520) ±1.0%
Volumetric Flow mL/min, L/min, cc/min, cf/min
Pressure (Defender 520 only) mmHg, PSI, kPa
Gas Compatibility Use with non-corrosive, non-condensing, non-combustible gases, less than 70% humidity
Flow Modes Suction or Pressure
Temperature & Pressure Sensors In the flow stream\nPress: 3.5 mmHg (typical), 7.0 mm (max)\nTemp: 0.8 °C (typical) 1.3 °C (max)
Reading Styles Single (manual), Continuous or Burst, with averaging function user-selectable from 1 to 100 measurements
Battery System 6V rechargeable, sealed lead-acid, 6-8 hours typical operation
Battery Operational Time (5 cycles/min), 3 hours backlight on, 8 hours backlight off
Pressure & Suction Fittings ¼” ID Hose Barb
Operating Pressure (Absolute) 15 PSI
Laboratory Accreditation Backed by ISO 17025 accreditation by NVLAP of NIST
Instrument Certification RoHS and CE Compliant