Conmark Systems Inc.
Continuous Performance Improvements for the Pulp & Paper Industry        

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Line-Tec 100 Fiber Optic Web Break Detector

The Line-Tec 100 Web Break Detector is fiber optic web break detection system which operates on a proven non-contact, reflection principle. An optical sensor is placed above or under the web to becontrolled. Typical applications include paper, board webs, and felts. The optical sensor is not affected by dirt, steam or temperatures up to 350 °F. The optical sensor is connected through a fiber-optic cable to an infra-red amplifier located in an enclosure away from the heat of the running web. The amplifier sends a special light signal through the transmitting element to the surface to be controlled. The reflected light is picked up by the receiving element and transmitted to the amplifier. This returning signal is then converted to a 4-20 mA current signal which is used to provide two alarm outputs.Line-Tec 100  Web Break Detector

The simple truth is that sheet breaks are a fact of life...but Conmark offers papermakers a select group of products, combined with many years of application expertise, which effectively detect, capture, reduce or prevent sheet breaks, while significantly improving your bottom line. Conmark Systems has carefully chosen high-quality partners with industry experience to integrate expertise and products into a unique new Web Break Reduction Program, which provides papermakers with the tools they need to reduce lost time on paper machines. So, while sheet breaks are a fact of life...... reliable detection, capture for review and diagnostics, reduction and prevention of sheet breaks are all within your reach.

A major component of our Break Reduction Program is reliable detection of sheet breaks. Conmark’s Line-Tec 100 detects sheet breaks with 100% reliability. Using state-of- the-art fiber optic technology, Line-Tec 100 avoids many of the problems that other detectors have run into, such as disturbances from the environment. Lots of money and time goes to unnecessary waste due to web and sheet breaks and detection of these breaks is the first vital step towards reducing them.

Line-Tec 100 Options:

  • LT100-5 Sheet Break detector 15ft Fiber Optic Cable
  • LT100-7 Sheet Break detector 21ft Fiber Optic Cable
  • LT100-10 Sheet Break detector 30ft Fiber Optic Cable
  • LT100-12 Sheet Break detector 36ft Fiber Optic Cable
  • LT100-15 Sheet Break detector 45ft Fiber Optic Cable

Following Components are included with the Delivery: Control Cabinet LT-100, Sensor Head and Fiber Optic Cable, Protection Conduit, Sensor Head Extension Pipe, Sensor Head Frame Mounting Bracket, and Position Ring

 Principle of the Technology:

The LT-100 fiber optic web break detection system operates on a proven non-contact, reflection principle. An optical sensor is placed above or under the web to be monitored. Typical applications include paper, board webs, and felts. Standard sensors are not affected by dirt, steam or temperatures up to 350 °F. The optical sensor is connected through a fiber-optic cable to an infra-red amplifier located in an enclosure. The amplifier sends a special light signal through the transmitting element to the surface to be controlled. The reflected light is picked up by the receiving element and transmitted to the amplifier. This returning signal is then converted to a 4-20 mA current signal which is used to provide two alarm outputs

 

Applications:

  • Line-Tec 100 indicates the web break on the open space if  reflection of the light drops with an on/off voltage or a 4-20 mA current signal
  • Line-Tec 100 bounces an infra-red light signal off the web running on the felt. If the web breaks and allows the signal to bounce off the felt, the characteristics of the returning infra-red light signal change - identifying a web break.
  • Line-Tec 100 sensor bounces an infra-red light signal off the roll. The characteristics of the returning infra-red light signal change related to the reflective characteristics of the roll, indicating the sheet break.
  • Line-Tec 100 sensor bounces an infra-red light signal off the roll. The characteristics of the returning infra-red light signal change if the sheet adheres to the roll, indicating that the sheet is running in the wrong direction. The sensor will alarm, providing a quick response signal for machine operators during machine start-ups.

 

Technical Specifications:Line-Tec 100 in service

  • Control Cabinet
    • Power Supply 110V 60 Hz
    • Power Consumption 70 mA
    • Temperature 15 to 150 F
    • Protection Mode Nema 4
    • Output two “on / off” alarm relays, one 4-20 mA
  • Sensor
    • Material 304 SS
    • Temperature 32 F - 350 F
    • Humidity 100%
    • Dirt Self cleaning with pneumatic instrument air
    • Light 4 kHz, 870nm infra-red light
  • Fiber Optic Cable
    • Lengths 15ft, 21ft, 30ft, 38ft, 45ft
    • Temperature 32 F - 350 F
    • Protection Teflon/steel conduit

 

 

 

Manufacturer: Vision Systems Oy; Jyvaskyla, Finland; http://www.visionsystems.fi/

Line-Tec 100 Main Features:

  • Precise, continuous monitoring of the web with infra-red light.
  • Immediate reaction to a web break due to the 4 kHz light frequency.
  • No disturbance from direct or reflected visible or infra-red light, static electricity, steam, extreme temperatures, dirt or vibration.
  • Minimal installation space required. The unit may be installed between cylinders, above felts and rolls and in press gaps.
  • The sensor can be located a distance of 2 - 8 inches from the web.
  • Production cost savings due to the elimination of false alarms or missed breaks, as well as a reduction.

Press Section Installation 

Benefits :

  • Saves hundreds of thousands of dollars preventing machine damages with reliable automatic kick-off showers.
  • Precise, continuous monitoring of the web with infra- red light.
  • Detectors can also be used to indicate if the web is running in the correct direction.
  • User-friendly, mounting, directing and aiming sensor is easy.
  • Need of service can be observed from DCS or PLC.

Dryer Installation 

Sample Installation