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The Definer™ 220

The Definer 220

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 organizations, ±2% or ±3% of reading standardized accuracy is no longer enough.

They need more. They need the dependable Definer™ 220 primary flow meter.

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 standardize 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, customization and durability needed in today’s exacting, fast-paced workplace. 

Click here to learn more about the Definer 220.

Click the below application note for more information


Flow Ranges Low (L) 5 scc/min - 500 scc/min
Medium (M) 50 scc/min - 5,000 scc/min
High (H) 300 scc/min - 30,000 scc/min
Accuracy 1% Standardized / 0.75% Volumetric
Size Small enough to fit easily in your hand;
slim enough to slide into a briefcase or tote
Weight 29 oz / 820 g
Dimensions (H x W x D) 5.5 x 6 x 3 in / 140 x 150 x 75 mm


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


Definer 220 Specifications
Approximate Time Per Reading: 1-15 seconds
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)
Reading Styles: Single (manual), Continuous or Burst,
with averaging function user-selectable
from 1 to 100 measurements
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: ¼" ID Swagelok® compression fi ttings
Warranty: 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 (for use with Optimizer software): Serial (RS-232)
Data Cable (for use with Optimizer software): 1 meter (Definer Data Port to PC serial port)
Protective Case: Soft side or Pelican case available
RoHS- and CE-compliant