F&J SPECIALTY PRODUCTS, INC.

- Model DF-28B - Digital Flow Meter Low Volume Air Sampler (100 - 120 VAC)

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The Model DF-28B 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 pressure drop at all times, 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 flow meter has a large bright LED display.

  • Bright LED Display
  • 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 21.1ºC (70ºF), 1 Atm or
    4. Standard Ambient T and P 25ºC, 1 Atm
  • Reference or ambient flow conditions are operator selectable
  • Elapsed time meter
  • RS232 Data export in ASCII format in comma delimeted text string at various operator selectable download frequencies
  • Storage of elapsed time and volume in the event of power outage
  • Detection of zero flow condition after return of power to pause elapsed time until flow returns
  • Auto shut-off on time or volume
  • Selectable engineering units for flow and volume (to be set at factory)
    • FLOW : VOLUME
    • sccm : scc
    • SLPM : SL
    • SCMH : SCM
    • SCFM : SCF

  • Detection of zero flow condition to actuate a relay that provides an audible or visual alarm locally
  • FlashCard Datalogger system to capture and store real-time data from the RS232 port.
    • Data Storage Device: P/N: 232FCDSD
    • 2+ GB Secure Digital Card: P/N: 372239
    • FlashCard Reader: P/N: SDDR-199-A20

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