Distributiestraat 73
4283 JN Giessen

phone +31-(0)183-445050
mail info@mctec.nl

Schopper Riegler Freeness Tester

Voor het bepalen van de graag van refining/beating van een pulp suspensie in water. De waarde wordt weergegeven als Schopper-Riegler nummer (SR). Tevens wordt dit toestel gebruikt om de de-watering tijd te bepalen. De Schopper Riegler Freeness Tester is leverbaar in 3 uitvoeringen namelijk handmatig, pneumatisch en automatisch. Bij het handmatige model wordt de lift kegel via een gewicht omhoog gebracht. Bij het pneumatisch model gaat dit pneumatisch. Bij het automatische model wordt dit ook pneumatisch gedaan. Het automatische model beschikt daarnaast over een aansluiting voor een computer, een sensor die de SR waarde uitleest en een digitaal display die de SR waarde weergeeft.


Applicable standards:
ISO 5267-1
Scan C 19 M3
BS 6035/1


• Completely made of stainless steel materials
• 5 models available:
– Mechanical
– Pneumatic
– Digital: Electronic determination of results
with digital display and data transfer
(pneumatic lifting)
– U-shaped stand for the direct use of a balance
under the measuring cylinder
(optionally for all models available)
– Drainage chamber with bayonet fixing of wire screen
• Single-button control (meets the safety requirements)


Mechanical model:
As pneumatic model, but sealing cone is lifted by built-in weights.

Pneumatic model:
As above, but without display and sensor.

Digital model:
The Schopper-Riegler apparatus measures the degree of work done on the fibres 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. The drainage chamber is fitted with a wire screen (100 cm²) at its lower end and is sealed 25 mm above the screen when the sealing cone is lowered. After filling 1 litre of suspension into the drainage chamber the sealing cone is raised pneumatically. As the filtrate drains into the rate measuring funnel a fibre pad is formed on the screen, slowing down the process depending on the mechanical treatment to which the pulp has been subjected. The discharge from the side orifice is collected in a graduated cylinder, measured by an ultrasonic sensor and the
result displayed digitally.

Test description

The funnel and drainage chamber of the Schopper-Riegler apparatus are cleaned thoroughly and finally rinsed with water. The drainage chamber is placed in the seat of the funnel. The temperature of the apparatus is adjusted by rinsing it with water at 20.0 ± 0.5 °C. The sealing cone is closed by pressing “stop” and the SR measuring cylinder is positioned beneath the side orifice. Whilst stirring, 1,000 ml ± 5 ml of homogeneous pulp suspension is transferred to a clean measuring cylinder. The sample is mixed by closing the top of the cylinder by hand and turning it end-over-end for two cycles. Care should be taken not to introduce air into the stock at this stage. The sample is poured rapidly but smoothly into the drainage chamber. The sealing cone is raised 5 sec after all the pulp suspension has been added. When no more water drips from the side orifice, the SR number on the display is read to the nearest unit.


P59588, digital version:

• Digital display for °SR and 4 de-watering periods,
• Pneumatic lifting
• Ultrasonic sensor, RS-232 interface, software and cable
• All non-corrosive materials
• Drainage chamber, funnel, and orifices made of 316 stainless steel
• 2 SR-cylinders, tool for easy wire screen change

P59587, pneumatic version:

without display, cable and software

P95586, mechanical version:

as pneumatic, but with mechanical lifting weights

Technical data

Electricity: 230 V, 50 Hz (digital version only)
Water supply: None
Compressed air: 400-600 kPa (not applicable for mech. lifting weights)
Dimensions (WxDxH): 38x35x87 cm
Net weight: 32 kg
Gross weight: 42 kg

Meer informatie?

Neem contact met ons opplay_arrow