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Canadian Standard Freeness Tester

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



• digital and manual version available
• made of robust stainless steel
• Filling chamber and separating funnel made of lightweight special plastic
(Easy to handle and clean)
• calibrated nozzle and sieve plate
• Sieve plate calibrated according to PAPTAC
• digital version with temperature compensation according to standard
• Drainage curve can be displayed via ProbeNet


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. A precise balance unterneath measures the csf values which are displayed digitally.
The actual temperature of the suspension is measured simultaneously and the result corrected automatically.

With a manual version of the device the csf values can be read on the measuring cylinder which collects the outcoming water.

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.

Available models:

S415100001 Canadian standard freeness tester (CSF) manual
S415100003 Canadian standard freeness Tester (CSF) digial with temperature compensation

Recommended accessories:

S955871013 SR und CSF freeness cylinder plexiglas

S4069000001 ProbeNet software with one device license

For sample Preparation:
S955680001 Desintegrator without container
S955681001 Acrylic glass container for desintegrator
S955681002 Stainless steel container for desintegrator

Technical Data

Power: 230 V, 50-60 Hz (nur Version digital)
Power consumption: <25W
Compressed air: no

RS232             Data output
Ethernet          Data output
USB                Updates / Service
*only digital version

Version digital:    CSF in ml / ml compensated / temp in C°
Version manuel:  CSF in ml (read on the cylinder)
Measuring accuracyt: 1ml
Statistics: min., max., mean value, standard deviation of the measurement series

Dimensions (BxLxH): 330 x 380 x 1000 cm
                           digital          manuell
Weight net:     
 ca. 34 kg           ca. 28 kg
Weight gross:  ca. 65 kg           ca. 60 kg

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