DFA - Dynamic Filtration Analyzer

The DFA Dynamic Filtration Analyzer determines quickly and accurately the influence of chemicals on the filtration characteristics of fiber suspensions by an automatic analysis of drainage and retention.


simulation of the dynamic situation in the wet-end range by adjustable stirring profile (defined entry of shear forces) and interchangeable screens, use of customer-specific screens optionally possible
lightweight construction
fast and repeatable (automated) measurement sequence
reproducible and sensitive measurement method
illustration of the dewatering behavior via graphs
data storage and evaluation possibilities via the software
investigation of the interaction of additives on the flocculation process
setermination of product efficiency in product alternatives
combination of dewatering and retention measurement in one device, based on the Schopper-Riegler method to measure the dewatering and on the classic dynamic Drainage Yar Method for the determination of the retention (two in one)
analysis of the performance of flocculation agents, retention aid and diverse other additives

Product description

A PC operates the DFA. The user-friendly software controls the measurement and allows a sophisticated analysis and reporting of all results. In order to simulate different process conditions, all relevant data to configure a mixing profile is stored and used for automatic measurements.

The user selects a mixing profile or sets all relevant mixing parameters before starting the measurement. After that, the DFA stirring chamber fills with the fiber suspension. The selected set mixing profile starts to stir the suspension as per set parameters. A dosage of chemical additives during the stirring process is possible to influence the drainage and retention process. Thru the use of audible prompts the user is notified when to introduce any chemicals. A valve opens automatically when the mixing process is finished. Filtration through selected screen starts immediately.

Filtrate is continuously measured with approximately five sample points per second. The quantity of filtrate is shown on a graph as a function of time. The computer software allows displaying different graphs, comparing results, adding all kinds of parameters to graphs or creating comparable graphs. E.g., the quantity of dosed chemicals can be compared to the dehydration velocity. The export of all measurement data into an EXCEL-spread sheet for further analysis and data storage is possible. The instrument also has an integrated pH-measurement.

Retention Measurement:

The DFA system is equipped with the possibility to calculate Total Retention and Filler Retention. A filtrate is produced by the DFA system for determining the retention. Different practical filtration conditions can be simulated with a magnetic valve under the filter and different mixing gears. The filter remains clean by the mixing gear. The user has to enter the filler content or the overall solid content of the filtrate and the sample in the PC and get the total or filler retention by the DFA software.


Chemical suppliers
Paper machine builders
Paper producers
Board producers
Corrugated board producers
Pulp producers
Universities & Institutes

Application areas

Process optimization
Process control
Product optimization
Complaint management


Drainage curves (time/filtrate amount)

Overall retention

Filler retention

pH value

Technical data

device dimensions

18.9 x 25.5 x 50.1 cm (W x D x H)


17.5 kg

power supply

input voltage: 85 - 264 V AC Frequency: 47 - 63 Hz Consumption maximum: 80W Fuses of the device: 1 x 10 A slow-blow

operating condition

Surrounding: +10°C [+50°F] to +40°C [104°F]; not condensation

transport and storage condition

Surrounding: -10°C [+50°F] to +40°C [+140°F]

emtec Electronic GmbH

Gorkistr. 31
04347 Leipzig


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