Experion MX Moisture Measurement Transmission Infrared Moisture (TRIR) Measurement

Experion MX can help improve your business performance in today’s challenging economic environment. This fully integrated quality control and process knowledge system provides superior visibility into the papermaking process while it simplifies operational efforts, and is easy and cost effective to maintain and service. Improve paper quality, reduce raw material, energy and maintenance costs, and increase production efficiency with a package of solutions that provides the lowest total lifecycle cost available.

Moisture Measurement

The Transmission Infrared Moisture Sensor provides accurate, online moisture measurement for a wide range of products, including lightweight papers, highly filled and coated papers, papers containing carbon, and paperboard. Model Q4205-51 is recommended for most paper grades, and has a sub-millisecond time constant that enables measurement of moisture variations up to 200 Hz for high-frequency process monitoring. The fast sensor response delivers 10 mm cross direction (CD) resolution, even at scanning speeds up to 1,200 mm/s. Models 4205-52 and 4287-57 are recommended for heavier sheets, including many paperboard grades or grades containing large amounts of recycled non-deinked paper and board; key specification differences for these two sensors are noted in the table.

With accurate moisture measurement your business performance will be enhanced by increasing product quality, minimizing energy consumption and increasing production

efficiency. The direct measurement of the sheet’s scattering power is integrated with a proprietary measurement model to eliminate error caused by variations in basis weight, ash content, and carbon levels, which reduces your grade maintenance efforts. The sensor’s advanced optical design ensures accurate measurement that is insensitive to changes in sheet temperature, moisture stratification and passline. With the high modulation rate the sensor increases signal to noise and continuously measures all channels to provide unmatched speed of response. All this provides superior visibility into the papermaking process.

Features and Benefits

• Integration of sheet scattering power and moisture measurements with a proprietary algorithm eliminates error resulting from varying basis weight, refining, additives, filler levels, carbon levels and coat weight

• Patented INFRAND optics reflect transmitted infrared energy back into the sheet for additional absorption, enhancing sensitivity

• Advanced detector technology limits the impact of sheet temperature on moisture measurement to less than ± 0.003%/°C change in sheet temperature

• Dedicated detectors for each wavelength measured (Same-Spot Measurement) provide accurate, formation-insensitive measurements with high-speed sensor response

• Unique measurement geometry and Same-Spot Measurement resolve moisture streaks less than 1 cm wide, even at scanning speeds up to 1,200 mm/s

Experion MX TRIR Moisture Measurement 2

• Fast sensor response enables fast scanning to quickly resolve profile changes, for tighter profile control

Description

The family of transmission infrared Moisture measurements all utilize selective absorption of infrared energy to determine the moisture content of a moving web. The measurement is based on the principle that water in the sheet absorbs specific infrared wavelengths. The wide range of basis weights that can be measured with these sensors, coupled with their speed and accuracy, make them an important part of advanced MD and CD Multivariable Controls available with Experion MX for process improvements beyond traditional systems.

Insensitivity to Sheet Scattering Power

The source emits broad-band infrared energy into the sheet gap, where it is widely scattered and reflected between diffuse reflecting plates located above and below the sheet. These INFRAND optics (named for INFinite, RANDom scattering) include a 50 mm machine-direction (MD) offset between source and detector assembly, which forces the source energy to make numerous passes through the sheet before being detected. The additional interaction of the source energy with the sheet increases absorption of measured wavelengths, providing greater signal and greater sensitivity than other optical designs. Machine-direction alignment of the source and detector provides excellent CD resolution and streak visibility without compromising sensitivity. In addition to the moisture and reference detectors that are offset from the source, a third detector is located directly opposite the source to provide information on the sheet’s scattering power. Integrating the scattering power measurement with moisture and reference measurements eliminates the effects of varying basis weight, refining, ash levels, carbon levels and coat weights. As a result, the moisture sensor is sensitive only to moisture, providing excellent accuracy.

High Stability and Sensitivity

Each detector assembly consists of an IR detector mounted on a two-stage, solid-state Peltier cooler. Peltier cooler control maintains the temperature of each detector at 0°C, providing 300% greater sensitivity than detector operation at ambient temperatures. Control of detector temperature to ± 0.005°C stabilizes sensitivity to 1 part in 10,000, ensuring extraordinary sensor stability. All detectors are phase-referenced to the

modulation frequency of the source, to ensure insensitivity to ambient infrared energy.

200 Hz Frequency Response

The source continuously emits broadband infrared energy into the sheet, modulated to eliminate sensitivity to ambient light. Energy that has interacted with the sheet and gets to the receiver is analyzed by all detectors simultaneously, enabling continuous measurement of all wavelengths from the same spot on the sheet. As a result, detector signals at any time contain all of the information necessary for accurate moisture measurement without any effects of paper formation. This signal processing strategy provides the fast sensor response that is critical for high resolution profile measurement at fast scanning speeds and for high-frequency process monitoring. Conventional sensors often use a single detector with multiple filters in a spinning wheel; filter wheel rotation and paper movement means measurement of each channel takes place at a different spot, resulting in formation-induced sampling error (noise) and slow overall sensor response.

Internal sensor architecture of Honeywell's TRIR measurement

Experion MX TRIR Moisture Measurement 3

More Information For more information on Experion MX TRIR Moisture Sensor, visit www.honeywell.com/ps or contact your Honeywell account manager. Automation & Control Solutions Process Solutions Honeywell 1860 W. Rose Garden Lane Phoenix, AZ 85027 Tel: 800-822-7673 www.honeywell.com/ps

Long-Term Accuracy

Periodic standardization ensures long-term accuracy by eliminating the effects of dirt buildup and other external

sources of error. Standardization results are one of the many elements of the enhanced maintenance and advanced diagnostics capabilities for this sensor, helping to deliver the lowest total lifecycle cost available.

. Specifications: Experion MX Moisture Measurement - Model Q4205 (TRIR)

Category Specification Sheet gap 10 mm Moisture range Up to 30% Ash range Any ash level Repeatability, 2σ* 0.05% moisture Accuracy, 2σ 0.25% moisture, 0.5% moisture in the presence of elemental carbon or iron oxide Prerequisite measurements Basis weight Max Ambient Temperature 100°C Models Q4205-51 Q4205-52 Q4287-57 Basis weight range** Up to 400 g/m2 Up to 750 g/m2 Up to 1,000 g/m2 Frequency response, -3dB 200 Hz 70 Hz 70 Hz Time constant 0.8 milliseconds 5 milliseconds 5 milliseconds Measurement spot width, CD

10 mm 25 mm 25 mm

* On internal optical standard

** Basis weight range is approximate. Actual basis weight range depends on characteristics of the measured product. Contact Honeywell Sensor Application Engineering Department for recommendations on special applications

PN-10-25-ENG September 2010 © 2010 Honeywell International Inc.