Line-Tec 200 Fiber Optic Edge Guide

The Line-Tec 200 Edge Guiding System is fiber optic fabric edge detection system which operates on a proven non-contact, transmission principle. An optical sensor is placed on the side of the felt or wire and an infrared pulsated light curtain is transmitted from the transmitter to the receiver and web is blocking the light relative to the edge of the fabric. Edge position signal 4-20mA is transmitted to the pneumatic control system, which controls the angle of the fabric control roll. Typical applications include paper machine wires, 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 infrared 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 receiving element. The transmitted 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 control signal to edge control system.

WHY NON_CONTACT?

Fabric Control loops play an essential role in the paper making process. Effective and reliable fabric control can help paper makers eliminate speed and runnability issues. To solve these issues, the Line-Tec 200 fiber optic IR-based fabric-positioning unit was designed. It  fills the needs for fabric controls from wet end to reel.
Line-Tec 200 provides significant non-contact benefits compared to all of today's edge sensors, such as the ability to withstand heat and moisture.
Line-Tec 200 is a vital tool for increasing the life of the fabrics and for improving production with higher speeds and better runnability..

Line-Tec 200 Options:

• LT200-7 Edge Guiding sensor with 21ft Fiber Optic Cable
• LT200-95 Edge Guiding sensor with 30ft Fiber Optic Cable
• LT200-12 Edge Guiding sensor with 36ft Fiber Optic Cable

Following Components are included with the Delivery: Control Cabinet LT-200, Sensor fork and Fiber Optic Cable, Protection Conduit,  Extension Pipe and Frame Mounting Bracket.

 Measurement Principle:

The LT-200 fiber optic web break detection system operates on a proven non-contact, transmission principle. A fork with the optical sensors is placed above or under the fabric to be monitored. Typical applications include wire, press felts and dryer felts. The sensors are not affected by dirt, steam or temperatures up to 350 °F. The optical sensors are connected through a fiber-optic cable to an infrared amplifier located in an enclosure away from the heat of the running web. The amplifier sends a special pulsated and synchronized infrared light through the transmitting element creating optical curtain. This optical curtain is detected by a similar receiving element on the other side of the fork and ltransmitted to an amplifier. This signal is then converted to a 4-20 mA current signal, which is used to provide control signal for the pneumatic actuator

Technical Specifications:

• Control Cabinet
  • Power Supply 110V 60 Hz
  • Temperature 32ºF to 150º F
  • Protection Mode Nema 4
  • Output two “on / off” alarm relays, one 4-20 mA
• Sensor
  • Material 304 SS
  • Temperature 32ºF - 350ºF
  • Humidity 100%
  • Dirt Self cleaning with pneumatic instrument air
  • Light 4 kHz, 870nm infrared light
• Fiber Optic Cable
  • Length  21ft, 30ft or 36ft
  • Temperature 32ºF - 350ºF
  • Protection Teflon/steel conduit

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

Line-Tec 200 Main Features:

• Precise, continuous monitoring of the edge position with pulsated infrared light.
• Immediate reaction to an edge position due to the 4 kHz light frequency.
• No disturbance from direct or reflected visible or infrared light, static electricity, steam, extreme temperatures, dirt or vibration.
• Minimal installation space required. The unit may be installed in any environment around and inside of the paper machine.
• The sensor has the accuracy of 1 mm.
• LT-200 works with all existing guiding actuators, as well as with pneumatic and electrical actuators.
• Measuring sensor can be mounted either front side or back side of the machine.
• System is equipped with rotating mounting bracket, this for example will be used during roll change

Benefits :

• Due to non contact measuring principle LT-200 will not wear fabrics or felts edges. This ensures the maximum life-time of the fabric, and a higher production speed of the machine.
• When connecting the output signal to DCS, LT-200 gives continuous, on-line information on the fabric edge position, guiding pressures and valuable data on condition of the guiding roll actuators.
• Need of service can be observed from DCS or PLC.