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Home : Pulp & Paper Solutions : Freeness Control : Drainac IIIB Online Freeness Analyzer Drainac™ IIIB OnLine Freeness Transmitter
 | The Drainac™ Online Freeness Transmitter is a continuous freeness analyzer that provides precise, real-time information to effectively manage changes in freeness.
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. It is designed to operate in all types of installation situations including pressured stock lines, low pressure stock lines, stock lines under vacuum, or open vessels.
The Drainac™ is easy to use and understand. Automatic cleaning keeps the analyzer free from errors and minimizes any maintenance requirements making the Drainac™ the best choice for online freeness measurement.
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Product Features & Benefits- Fast Sample Rate 2-3 samples / minute allows for superior refiner control performance.
- Directly Measures Drainage Rate calibrates to freeness (CSF), Williams Precision Slowness, or Schopper-Reigler.
- Complete Inline System no wasted product or sewered samples.
- Multiple Calibration Characteristics for applications with different grades and/or furnishes.
- Self Cleaning System minimizing maintenance and sampling errors.
- 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.
Description The Drainac™ operates on the basic principle of 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, avoiding 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 stock line 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. Specifications Sensor| Sample Rate | 2-3 samples/minute typical | | Pressure | Stockline (10-90) psi; Low Pressure Unit (0-25 psi) | | Stock Velocity | 0.1 - 10 ft./second | | Freeness | 0-800 CSF, 10-90° SR, Williams Precision Slowness, 0-300 sec Drain Time | | Consistency | 0.5 - 6.0% (readily adaptable to other consistencies) | | Water | Min 10 psi above max stockline pressure. Average consumption: 0.3 gpm | | Air | Min 10 psi above max stockline pressure. Average consumption: 1.5 scfm for stockline units, 12.5 scfm for other units | | Probes | 316SS (standard), other materials available | | Flush Points | Top of chamber spray, over screen spray, and below screen flush |
Transmitter | Display | Variable contrast graphical LCD | | Electronics | Microprocessor based | | Analog Input | (1) 4-20 mA for active compensation | | Analog Output | (1) 4-20 mA for compensated freeness | | Communication | (1) full duplex choice of protocols: RS232 / IEEE 422/ IEEE 485 | | Calibration | Computer guided process sampling and internal parameter calculation | | Recipe Memory | Retains (10) ten settings and calibration parameters | | Enclosure | NEMA 4X |
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C5000 Consistency Sensor
The C5000 Consistency Sensor the workhorse of the TECO Stockrite family of consistency instruments. The main feature of the C5000 sensor is the retractable design with isolation valve, enabling the papermaker the ability to clean, repair or replace without a costly production outage.
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