Definer Series Calibrators

Laboratory and field ready primary calibrators for critical industrial and environmental applications.


Now more than ever, modern industry requires precisely-honed process control systems. Requirements, standards and competition have become so demanding, and the margin for error so slim, that for many organisations, 2% or 3% of reading standardised accuracy is no longer enough. 

The Definer 220 allows users to verify gas flow rates, in the field or in the lab, to an accuracy of 1% percent of reading, including temperature and pressure compensation. Unlike thermal mass flow meters, the Definer 220′s positive displacement technology provides immediate indication of actual volumetric gas flow rate – accurately and independently of gas type. Integrated temperature and pressure sensors in the flow stream allow users to automatically standardise volumetric flow readings to standard conditions, for traceable verifications of mass flow devices.

The Definer 220 represents the next generation of our Proven DryCal® Technology developed specifically for critical industrial and environmental applications. It provides the accuracy, customisation and durability needed in today’s exacting, fast-paced workplace.

For use with non-corrosive, non-condensing, non-combustible gases, less than 70% humidity.

For more information on the Definer Series Calibrators, contact your local Air-Met office. 

  • Flow Range:
    • Low:  5-500ccm
    • Medium:  50-5,000ccm
    • High:  300-30,000ccm
  • Single, Continuous and Burst reading options
  • Accuracy Volumetric (% of reading) 0.75%
  • Accuracy Standardised (% of Reading) 1%
  • Temperature & Pressure Sensors in flow stream
  • Temperature Readings: C°, F°
  • Pressure Readings: mmHg, PSI, kPa
  • MFC Gas Sensor Factor for Calibration of Alternate Gases other than Clean Air and N2.
  • Volumetric Flow Readings – mL/min, L/min, cc/min, cf/min
  • Standard Flow Readings – smL/min, sL/min, sccm, scf/min
  • 1/4″ ID Swagelok® Compression Fittings
  • Data Port: Serial (RS-232)
Definer 220 Specifications
Flow Ranges
*At gas pressure of 760 mmHg, and a gas temperature of 25°C with standardisation temperature set to 0°C
Low (Model 220-L) 5 scc/min - 500 scc/min*
Medium (Model 220-M) 50 scc/min - 5,000 scc/min*
High (Model 220-H) 300 scc/min - 30,000 scc/min*
Accuracy 1% Standardised / 0.75% Volumetric
Weight 820g
Dimensions (H x W x D) 140 x 150 x 75mm
User Selectable Measurement Units Volumetric Flow mL/min, L/min, cc/min, cf/min
  Standard Flow smL/min, sL/min, scc/min, scf/min
  Pressure mmHg, PSI, kPa
  Temperature °C, °F
Approximate Timer Per Reading
1-15 seconds
Reading Styles
Single (manual), Continuous or Burst, with averaging function user-selectable from 1 to 100 measurements
Gas Compatibility
Use with non-corrosive, non-condensing, non-combustible gases, less than 70% humidity
Flow Modes Pressure or Suction
Measurement Cell Style Integrated
Temperature and Pressure Sensors In the flow stream
Press.: 3.5 mmHg (typical), 7.0 mm (max); Temp.: 0.8°C (typical), 1.3°C  (max)
AC Adapter/Charger 12V DC, >250ma, 2.5 mm, center positive
Battery System 6V rechargeable, sealed lead-acid, 6-8 hrs typical operation
Battery Operational Time (5 cycles/min) 3 hrs backlight on, 8 hrs backlight off
Pressure and Suction Fittings
1/4” ID Swagelok® compression fittings, 3/8” fittings on High Model
Warranty 1 yr (battery 6 months)
Storage Temperature
Ambient Humidity 0-70%, non-condensing
Operating Pressure (absolute) Atmospheric, max 15 PSI
Backlit graphical LCD
Data Port (for PC interface) Serial (RS-232)
Data Cable (for PC interface) 1 metre (Definer Data Port to PC serial port) 
Protective Case Soft side or Pelican case available
Complaince RoHS
CE Compliant