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  1. Chromservis
  2. Chromatography
  3. Unit conversions
  4. Unit conversions in chromatography
  5. Choice of capillaries for different flow rates
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Chromatography

Flash and Preparative HPLCGC/MS-TOF
    GC/MS/MS
      Glossary
        Hints and tipsMetAmino kitStationary phasesSyringesUHPLCUnit conversions

        Choice of capillaries for different flow rates

        id Flow Color FROM
        0.13 mm Up to 2.0 ml/min Red 1/16"
        0.18 mm Up to 5.0 ml/min Yellow 1/16"
        0.25 mm Up to 20 ml/min Blue 1/16"
        0.50 mm Up to 50 ml/min orange 1/16"
        0.75 mm Up to 100 ml/min Green 1/16"
        1.0 mm Up to 200 ml/min Grey 1/16"
        1.59 mm Up to 500 ml/min 1/8"".
        2.40 mm Up to 1000 ml/min 1/8"".

        Inches to mm - inch x 25.4 = mm

        Feet per meter - feet x 0.3048 = meter

        Column pressure at a flow rate of 1 ml/min

        P = 2.1 xdx 10.13 xh / h 2 x vp 2

        P – pressure (MPa)
        L – column length in mm
        h - dynamic viscosity (for water = 1)
        d – internal diameter of the column in mm
        vp – particle size in µm

        The pressure on the 4.6 x 250 mm, 5 um column will be approx. 100 bar at a flow rate of 1.0 ml/min