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Canadian Standard Freeness Tester

Canadian Standard Freeness Tester

For measuring the rate of drainage of a dilute pulp suspension and expressing it in terms of freeness

  • Features

    • Completely made of stainless steel materials
    • Tested by Paprican
    • Drainage chamber made of lightweight Polyacetal (easy to handle and clean)
    • 3 models available:
       – Mechanical model
       – Electronic determination of results with
         digital display and data transfer
         (pneumatic lifting)
       – Electronic determination of results with
         digital display, data transfer,
         with compensation for temperature,
         and consistency correction


    Version with digital display, temperature compensation and
    concentration correction:

    The Canadian Standard Freeness Tester measures the degree of work done on the fibers during stock preparation (refining) and is therefore a primary tool in the evaluation of the characteristics of pulp. The apparatus consists of a drainage chamber and rate measuring funnel on a sturdy support. 1 liter of pulp suspension at 0.3% concentration drains through a perforated screen plate into a funnel provided with a bottom and a side orifice. The discharge from the side orifice is collected in a graduated cylinder, measured by an ultrasonic sensor and the result displayed digitally. The actual temperature of the suspension is measured simultaneously and the result corrected automatically. Any deviation from 0.3% is entered at the digital control panel before reading the fully compensated result in ml CSF.

    Test description

    Place the drainage chamber in position. Place the measuring cylinder in position to receive the discharge from the side orifice. Whilst stirring, transfer 1000 ml of homogeneous pulp suspension to a clean measuring cylinder. Close the bottom of the chamber of the freeness tester and open the top lid. 
    Mix the sample by closing the top of the cylinder with the hand and invert the cylinder through 180° three times, without losing the stock. As much as possible, avoid introducing air into the stock at this stage. Pour the stock gently but as rapidly as possible into the chamber. At the end of the pouring, the stock should be almost motionless in the chamber. This can be achieved by pouring the stock around the inside of the chamber and finishing the pouring in the centre. Immediately close the top lid, press “Stop” and open the bottom lid. Allow 5 sec to elapse from the time of opening the bottom lid, then press “Start” to begin the test. When the discharge from the side orifice has stopped, the concentration of the suspension should be entered at the digital control panel before reading the fully compensated result in ml CSF.


    All versions:

    • Calibrated screen plate in drainage chamber
    • Calibrated jet in funnel
    • All parts made of non-corrosive materials

    Version M (S415100001):
    • Manual model made of non-corrosive materials
    • Opening the air-cock starts the test
    • The result is read on the graduated cylinder

    Version D (S415100002):
    As above, but de-watering is started by pressing the “Start“button on the display. CSF value displayed digitally.

    Version T (S415100003):
    As version D, but with keypad for entering the actual stock concentration, automatic temperature measurement and compensation. Dewatering is started by pressing the “Start” button
    • °CSF or ml display
    • 3 de-watering levels for measuring the de-watering time
    • Temperature compensation (displays the actual value and compensated value)

    Technical data

    Electricity: 100 - 240 V, 50/60 Hz (for version D and T)
    Water supply: None
    Compressed air: None
    Dimensions (WxDxH): 38x33x72 cm
    Net weight: 29 kg
    Gross weight: 40 kg   

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