Analog & Digital AFC-XX – Low & Medium Volume Air Flow Calibrators, Analog & Digital Displays


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Product Highlights

  • Customizable – Simply Replace “-XX” with the Flow Range & Units of Your Choice.
  • Dependable – Direct, Reliable Readings Certified & Traceable to NIST.
  • Quick – Standard Quick Disconnect Fitting for Airtight Setups & Immediate Flow Readings.
  • Durable -Rugged Construction Built for Heavy-Duty Use in All Environments.

Air Flow Measurement Devices
HI-Q Environmental Products Company’s steel constructed, two-component polyurethane painted Air Flow Calibrator (AFC) housings incorporate a precision machined venturi tube to create a pressure differential across a fixed orifice. By varying the air flow velocities, the pressure differentials are measured & recorded against a laminar flow element whose calibration is certified and traceable to the National Institute of Standards and Technology (N.I.S.T.). The AFC’s overall internal simplicity of operation reduces the frequency of re-calibration to once or twice per year depending on (individual) regulatory protocol. AFC-XX series air flow calibrators are intended to be used open to air.

AFC-Series Flow Ranges
By varying the orifice size and the chosen Magnehelic® (Standard AFC) or differential pressure sensor/transmitter (AFC-DIGITAL), HI-Q can fabricate calibrators in almost any desired flow range. Unlike other manufacturers, HI-Q does not use pre-silk screened dial faces in their analog AFC units. HI-Q individually hand marks each AFC dial face.

Choosing an AFC-Series Flow Range
Flow vs. Pressure Differential produces a logarithmic (non-linear) reading. On a Magnehelic® gage the spacing between the numbers on the lower end of the scale will be close together and further apart on the upper end of the scale. For the greatest visual accuracy, HI-Q suggests, ordering a unit with the lowest upper range as practical (i.e.: don’t select an AFC-8 if your pump only draws a maximum of 4 CFM).


Analog style AFC
Analog style AFC units house a Magnehelic® differential pressure gage, whose relative volumetric flow rate units are transferred onto a direct reading scale. A reflective tape on the scale, behind the analog needle, reduces parallax error. Overall accuracy on analog AFC units is better than +/- 5%.

Digital style AFC
Digital style AFC units house an LED display which employs advanced technology for stable, drift free, readout while incorporating features that provide flexibility now and in the future with Plug-in option cards available for alarm contacts, analog output, and serial communication. The AFC-DIGITAL’s Rate/Total display indicates air flow rate in Actual Cubic Feet per Minute (ACFM) and displays total volume sampled in Actual Cubic Feet (ACF). Metric calibration is also available. Accuracy: +/- 1% full scale at calibration points. (15 points per standard calibration). Contact HI-Q for Analog to Digital Conversion kits.

Additional information


AFC-DIGITAL-XX (low flow), AFC-DIGITAL-XX (medium flow), AFC-DIGITAL-XXL (low flow), AFC-DIGITAL-XXL (medium flow), AFC-XX (low flow), AFC-XX (medium flow), AFC-XXL (low flow), AFC-XXL (medium flow)