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Mesa BIOS Definer

Mesa BIOS Definer

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.

Size 5.5"H x 6"W x 3"D
140 mm x 150 mm x 75 mm
Weight 29 oz. / 820 g
Flow Ranges  
Definer 220 (L) Low Flow 5 to 500 scc/min
Definer 220 (M) MediumFlow 50 - 5,000 scc/min 
Definer 220 (H) HighFlow 300 - 30,000 sccl/min
Accuracy At gas pressure of 760 mmHg, gas temperature of 25°C with standard temperature set to 0°C.


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 ºC, ºF
Approximate Time per Reading 1-15 seconds
Gas Compatibility Use with non-corrosive, non-condensing, non-combustible gases, less than 70% humidity
Flow Modes Suction or Pressure
Measurement Cell Style Integrated
Temperature & Pressure Sensors In the flow stream
Press: 3.5 mmHg (typical), 7.0 mm (max)
Temp: 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
AC Adapter/Charger 12 DC, >250 ma, 2.5 mm, center positive
Battery System 6V rechargeable, sealed lead-acid, 6-8 hours typical operation
Battery Operational Time  3 hours backlight on, 8 hours backlight off
Pressure & Suction Fittings ¼” ID Swagelok® compression fittings,
3/8" on High Model
Warranty Instrument: 1 year, Battery: 6 months
Storage Temperature 0-70 °C
Ambient Humidity 0-70% - non-condensing
Operating Pressure  (Absolute) 15 PSI
Display Backlit graphical LCD
Data Port  Serial RS-232 (for use with Optimizer software)
Data Cable 1 meter (Defender Data Port to PC Serial Port)
Protective Case Soft side or Pelican case available
Laboratory Accreditation Instruments are manufactured and calibrated by a company accredited to the ISO 17025, ANSI Z540, and NIST Handbook 150 standards. Traceability to the International System of Units (SI) and NIST is verified by accreditation to the ISO/IEC 17025 by NVLAP under Code 200661-0.
Instrument Certification RoHS and CE Compliant
I want to measure Flow
Products Flow Calibrators
Applications Flow Calibration

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