Drainac® is the Answer.

Visualize. Understand. Execute.

What if you could predict good paper here...

...instead of producing bad paper here?


The TECO Drainac® is the only freeness analyzer on the market that allows you to visualize the variability in your process.


On a frequency that leads you to understand how you can make proactive changes at the refiner.


That lead to the execution of your strategy to produce more salable product, increase uptime, and obtain better overall machine efficiency.

With the Drainac®, you’re seeing the actual freeness while the paper is being built and it helps you act in a more proactive, not reactive mode. This simple technology allows us to make quick decisions about refiner changes - better controlling the end product.

− Process SpecialistDrainac® Customer for 5 years


Pressure is reduced in the analysis chamber so stock rises into system

Stock fibers form a pad on the screen and only filtrate enters the chamber

We measure the rise time of the filtrate between the lower and upper probes

Believe it or Not, it’s Pretty Simple...

The Drainac® operates on the basic principle of measuring how easily water will drain through a pad of fiber. Approximately every 30 seconds, the Drainac® measures the rate of filtrate flow though a fiber pad. The Drainac® consists of a totally enclosed vertical riser which has no moving parts. The compact detector is mounted directly in a pressurized stock line or open vessel, which eliminates any sampling lags or transport delay time.

For pressurized applications, stock rises into the detector tube under controlled differential pressure. Fibers are retained on a perforated plate and filtrate passes through the pad which is formed. The time required to draw a known volume of filtrate through the pad is used to calculate freeness.

For non-pressurized applications, the Drainac® employs negative pressure to draw the stock sample into the detector tube for drainage rate determination. Once the freeness has been determined, air pressure is increased to return the filtrate and fiber to the stockline in preparation for the next cycle. At the same time, flush water is introduced into the chamber to clean the screen and the interior of the chamber. Cycle time ranges from 30-60 seconds

Product Summary

The Drainac® is your answer for consistent, quality paper production. This continuous on-line freeness analyzer provides precise, real-time information to effectively manage the changes in stock consistency that ultimately compromise your product and your production efficiency.

Ideally suited for closed-loop control refiner controls, the Drainac® measures freeness every 20-30 seconds and can compensate for any temperature or consistency changes. This allows refiner control systems to immediately adjust to variable conditions, resulting in better quality control, as well as fewer paper breaks. The simple, in-line design of the unit allows for an easy, low cost installation.

No matter what type of production environment you?re operating within, Drainac® is designed with flexibility at its core. This unit is currently operating successfully in all types of installation situations including pressured stock lines, low pressure stock lines, stock lines under vacuum, or from open vessels.

The Drainac® is easy to use and understand. Automatic cleaning keeps the analyzer free from errors and minimizes any maintenance requirements and costs, making the Drainac® the best choice for on-line freeness measurement.

Best of all, once your Drainac® is installed, it will last as long as your entire line. Since it has minimal moving parts and requires limited maintenance, it will provide decades of efficient service without asking for so much as a “thank you” in return.

  1. Sample Rate2 - 3 samples per minute typical
  2. PressureStockline (10-90 psi)
    Low Pressure Unit (0 - 25 psi)
  3. Stock Velocity0.1 - 10 ft./sec
  4. Freeness0-800 CSF, 10 - 900 SR, Williams Precision
    Slowness, 0 - 300 sec Drain Time
  5. Consistency0.5 - 6.0%
    (readily adaptable to other consistencies)
  6. WaterMin 10 psi above max stockline pressure
    Average consumption: 0.3 gpm
  7. AirMin 10 psi above max stockline pressure
    Average consumption: 1.5 scfm for stockline units. 12.5 scfm for other units
  8. Probes316SS (Standard) other materials available
  9. Flush PointsTop of chamber spray, over screen spray, and below screen flush
Features & Benefits
  • Complete Refiner Control - the faster sample rate (2-3 each minute) allows you to make immediate adjustments.

  • Flexible Calibration - measure drainage rate as calibrates to freeness (CSF), Williams Precision Slowness, or Schopper-Reigler.

  • Eliminates wasted product - the complete in-line system means no sewered samples.

  • Multiple Calibration Characteristics - perfect for applications with different grades and/or furnishes.

  • Minimal Maintenance - Self-cleaning system keeps it running without ongoing costs or downtime

  • Simple Design - easy to use and understand

  • Low Installation Cost - the simple design allows for easy, cost effective installation

  • Digital Communication - easily integrates into any DCS platform

  1. DisplayVariable contrast graphical LCD
  2. ElectronicsMicorprocessor based
  3. Analog Input(1) 4-20 mA for active compensation
  4. Analog Output(1) 4-20 mA for compensated freeness
  5. Communication(1) full duplex choice of protocols:
    RS 232 / IEEE 422 / IEEE 485
  6. CalibrationComputer guided process sampling and internal parameter calculation
  7. Recipe MemoryRetains (10) ten setting and calibration parameters
  8. EnclosureNEMA 4X
Want even more details?

Set up a conversation with your TECO Rep today. We love to talk shop and dig into the details!

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