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Proper Tether Length Makes a Tilt Switch Work Better

Tilt Switch installation before being corrected. This picture shows improper assembly to rigid pipe. Switch cannot freely swing to 17-degree tilt angle in the direction material will move it.

PROBLEM:
“When my material moves the tilt switch the switch does not give me the output to turn off my conveyor”

EXPLANATION:
Using a tilt switch installed on the underside of a belt conveyor in a sand & gravel facility is a typical application for this type of point level switch. As the pile of sand/gravel or any other material builds up under the conveyor, the pile eventually comes in contact with the tilt switch. When the switch is tilted to 17 degrees out of vertical, the state of the internal switch changes. The distance underneath the conveyor is usually several feet, but this can be set to suit your specific desire.

SOLUTION:
This problem is usually the result of the flexible tether chain or cable that is used to suspend the tilt switch from the conveyor being too long. When using a long flexible tether, the tilt switch will move slightly when the sand/gravel comes into contact with the sensor and then the sand/gravel will surround or “flood” the sensor burying it in the pile before the tilt angle of the tilt switch exceeds 17 degrees. The solution to this problem is to shorten the tether length so the tilt angle is reached sooner. One way to accomplish this and still maintain the desired distance underneath the conveyor is to use a rigid pipe or angle iron attached to a short flexible tether length of about one foot.

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