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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.

Give Monitor Technologies a call and let us put our creative solutions to work for you!

 

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Spotlight: Inventory Control
Solids Flow Detection  
Solids Flow Detection

Microwave solids flow detectors can be used in a variety of applications including feed mills & grain processing, consumer foods (cereal, sugar, cocoa, coffee), chemicals & pesticides and more. For example, one company uses Monitor’s Model SFD-2 solids flow detector to verify the flow of feed pellets through their various transport lines which involves a process where a horizontal screw auger is conveying pellets over to a vertical gravity chute.  The chute then directs the pellets to a process down below. They have carefully placed the SFD-2 so that it detects the pellets as they fall directly across the sensor face. (See Below)

Solids Flow_Pellet Application

The Model SFI and SFD-2 line of solids flow detectors from Monitor Technologies, LLC provide analog or relay outputs to indicate the flow / no-flow condition of powder and bulk solids materials in chutes and pneumatic conveying lines.  Using microwave Doppler radar technology these units are non-invasive plus extremely reliable and rugged to withstand the rigors of the installation and your process extremes. From automated systems with pneumatic lines to gravity chutes, solids flow monitors can help to improve process performance. They can assist in detecting flow problems, as well as, enhance the level of automation at a facility like turning a conveyor on or off.

For more information on Solids Flow Detectors click here or contact Monitor Technologies LLC at 800-766-6486 in the USA and 630-365-9403 worldwide.

 

>>Click here for more information about Solids Flow Detectors from Monitor Technologies.
>>Click here for more information on Plug Chute Solutions
>>Download Product Bulletin 813

 

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