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Introduction

The CS-5000 is an ultrasonic sensor integrated with a microprocessor based control card. It has been

specifically designed to monitor strip, hose, paper, gasket material, tubing, coil stock, etc. hung in a

slack loop. Slack loop control is used for the feed and/or rewind of products manufactured in a

continuous, linear manner. The diagram below is more instructive of the CS-5000's purpose.

Typically, the CS-5000's sensor is placed over a draped loop of slack material. The position of the loop

valley is sensed and is used to govern the speed of a follower device (in the diagram, it's a powered

winder). The CS-5000 may be programmed to control either upstream or downstream process

followers. Typical of upstream devices would be decoilers, straightener/flatteners, dereelers. Typical

downstream devices would be winders, cut-to length machinery.

The ultrasonic transduction is fairly straightforward. A burst of acoustic energy is broadcast toward the

target (the loop valley). Milliseconds later, the transducer is switched to receive mode to await the

echo return. The time between transmit and receive is measured. The speed of sound in air is

reasonably constant so the position of the target is accurately calculated by the system's processor.

The system works best when the target viewed is perpendicular to the beam axis. Some angular

variation is tolerated (about +/- 5 angular degrees), but when the angle is too severe, the echo return

misses the receiver entirely. In this case, the system will register a far loop even if the target is

physically in the control range. Most loops have either a parabolic or catenary curvature which aids in

bouncing the echo back to the receiver, much like a radar dish does.

When the system is set-up, a control range is defined. Near and far set points define it. Within the

control range, a signal (both 0-10VDC and 4-20mA are available) varies from either low to high or

high to low.