TetraCal® Calibrator for Ambient Air Samplers

Product Image of TetraCal® Calibrator for Ambient Air Samplers

Designed to go anyplace, indoors or out. From the top a 15,000 ft mountain to a 55° C desert or a -30° C snow field. Our primary element Venturi calibrators will operate for 20 continuous hours on 4 AA cells. We are pulsation free, accurate to less than 1.0% of the flow rate reading, NIST traceable and designed, built and calibrated in our ISO 9001:2008 facility. We have always built our calibrators to these standards. Our output screens show both Actual and Standard flow rates.

The BGI tetraCal® is the first and only volumetric continuous flow calibration/audit device which gives a direct indication of volumetric flow rate, standard flow rate, barometric pressure (both mm/Hg & mb), and ambient temperature in one instrument. It was developed for use with all types of air samplers in the 0.1 to 30 Lpm range using the tetraCal or 1 to 60 Lpm using the tetraCal-Ultra. Typical screens are shown below on the left.

It is the only field audit/calibration device which meets the same temperature criteria as the EPA designated samplers themselves. The temperature range is -30° to 55° C (EPA requires up to 40° C).

The heart of the tetraCal® is a venturi which is superior to an orifice in that it offers no sharp edges which can be damaged and a 90% recovery of the measurement pressure drop, important when calibrating some forms of speciation samplers or other critical orifice controlled devices. Because flow through the instrument is uninterupted, our graphic software provides a continuous output display of all functions.


  • Calibration and audits of PM10, PM2.5, and speciation samplers to U.S. EPA requirements
  • May be used on any sampler in the 0.1 to 30 Lpm range
  • Usable in field or laboratory
  • Suitable for calibration of cascade impactors


  • One switch (off/on) operation -- all data displayed on screen
  • No moving parts
  • 20 hour battery life (4-AA)
  • Furnished with universal power supply (120/240 VAC)
  • Download feature with supplied software
  • Auto ranging

tetraCal Specifications

Flow Rate Range 0.1-30 LPM for the tetraCal
1 - 60 LPM for the tetraCal-Ultra
Temp. operational range -30° C to 55° C
Temp. reading range -40° C to 55° C
Baro. pressure range 400 to 800 mm of Hg
534 to 1066 millibars


Control Module 3.25 in. high (8.25 cm) X 3.125 in. wide (7.94 cm) X 9 in. long (22.86 cm)
Height with venturi and hose adaptor
6.30 in (16.00 cm)
Weight with venturi 2.38 lbs (1.08 kg)
Carrying Case 15.75 in. wide (40.00 cm) X 4.5 in. high (11.43 cm) X 12.25 in. thick (31.20 cm)
Weight complete with contents 4.69 lbs (2.13 kg)

EPA PM2.5 and Chemical Speciation Sampler SOP (PDF)

TetraCal® Calibrator for Ambient Air Samplers
Item # BX-309 

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Product Image of TetraCal® Calibrator for Ambient Air Samplers