- Model DF-28BE - Digital Flow Meter Low Volume Air Sampler (220 - 240 VAC)


The Model DF-28BE environmental air sampling system with digital flow meter is a low volume air sampler consisting of a 1/4 H.P. oil-less carbon vane vacuum pump with a constant air flow regulator for use where a nearly constant air flow is desirable. The regulator holds a constant pressure drop across an in-line orifice by varying the flow through a bypass valve into the pump. This system allows the pump to work at a minimum head drop at all times by permitting it to run cooler; thus extending its service life. The oil-less pump requires no lubrication to maintain optimal efficiency during its service life. The pump is mounted on a base plate within a weather resistant aluminum environmental enclosure having four rubber feet. Handles are provided on the enclosure to facilitate transportation. The digital flowmeter has a large bright LED display. The typical operating flow range is 0.5 to 4 CFM (14 – 115 LPM).

The DF-28BE is designed for continuous indoor or outdoor use. This unit can be adapted for tripod mounting if desired. Please consult the product specifications for the design temperature range and the installation category.

The typical operating flow range is 0.5 to 4 CFM (14 – 115 LPM).

  • Display in English or metric units set at factory
  • Choices of flow/volume units:
    • sccm : scc
    • SLPM : SL
    • SCMH : SCM
    • SCFM : SCF
  • State of the Art microprocessor electronics
  • Flowrate and volume totalizations displayed are corrected to a factory settable Reference Temperature and Pressure (4 options available)
    1. Classical STP : 0ºC, 1 Atm
    2. Normal T and P : 20ºC, 1 Atm
    3. Modified Normal T and P : 70ºF, 1 Atm
    4. Standard Ambient T and P : 25ºC, 1 Atm
  • Reference or ambient flow/volume reporting is operator selectable
  • Elapsed time meter
  • Auto zero calibration feature of flow sensor
  • Bright LED display
  • Flow rate accuracy within ± 4.0% F.S.
  • RS-232 Communication Port w/Operator selectable download frequency for real-time data
  • 220-240VAC, 50/60Hz; single phase

  • 232FCDSD : Data Storage Device
  • 372239 : 2 GB Secure Digital Card
  • SDDR-199-A20 : FlashCard Reader

  • PUMP TYPE: Oil-less, carbon vane 1/4 HP, 1725 RPM @ 60 Hz
  • MAXIMUM CAPACITY: 4 CFM (115LPM) at 0” Hg Pressure drop
  • ULTIMATE VACUUM: 25” (635 mm) Hg at sea level
  • POWER REQUIREMENTS: 220 – 240VAC; 50/60 Hz; 3 amperes; single phase
  • ELECTRICAL CORD: All temperature, 3-wire, 14 gauge
  • THERMAL OVERLOAD PROTECTION: Furnished as an integral part of the motor.
  • CONSTANT AIRFLOW REGULATOR: Aluminum construction with silicon diaphragm; adjustable from 0.5 to 4 CFM (14-115 LPM)
  • HANDLE: Steel
  • DIMENSIONS: 48,3L × 31,75W × 33,7 cm H (19”L × 12 ½”W × 13 ¼”H)
  • WEIGHT: 26,8 kg (59 lbs.)

    • Air flow: ± 4.0% of full scale
    • Temperature: ± 2,0ºF (1,1ºC)
    • Barometric Pressure: 2% over measured range
  • OPERATING TEMPERATURES: 32º-104ºF (0º-40ºC)
  • STORAGE TEMPERATURE: 32º-122ºF (-0º-50ºC)
  • CALIBRATION: Factory calibration once per year
    • Flow calculation from differential pressure value using best fit curve method
    • Flow correction for standard temperature and pressure
    • Auto-zero correction utilizing Electro-pneumatic method to compensate for offset and drift (automatic, once every minute)
  • COMBINATION FILTER HOLDER:Durable plastic combination filter holders for F&J Model B, C or M charcoal cartridges and 47 mm, 2” or 50 mm diameter particulate filter paper are available. All models have quickdisconnect function.

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