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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.

SITUATION:
“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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Economical High Level Sensing in Grain Storage Bins

   

 

 
Spotlight: RF Capacitance Level Sensor
TrueCap Level SensorsTrueCap Light  
TrueCap® MK-2
Advanced RF Capacitance Level Probe

The TrueCap® Model MK-2 RF Capacitance point level probe is designed to provide a superior and stable sensitivity threshold making it suitable for a variety of powder / bulk solids and some liquid or slurry applications.

Advanced features of the Model MK-2 include:
> Automatic immunity to material build-up on the probe by its driven shield design
> Push-button calibration
> Enhanced temperature compensation
> Maximized reliability via smart sensing algorithms like “self-validating” fail-safe protection
> Visible status LED on ordinary location units
> Versatility through a variety of configuration options including: hazardous location version, split architecture design, quick-connect process connection, stub probe, cable extensions, solid extensions, Nylon® probes, Ryton® - equiv. probes, etc.

A practical application for the TrueCap would be to use this level sensor where a residual material build-up on a different sensor would cause a false material level indication.

Principle of Operation for the TrueCap RF Capacitance Level Probe:
The vessel wall and the active probe element establish an impedance reference between each other when exposed to air which has a dielectric constant of 1. When materials with a dielectric constant greater than 1 are in close proximity to the probe, the impedance of the sensing field between the sensor and the vessel wall will change. Once the amount of change exceeds a threshold that was electronically determined during the calibration process, an output relay will either be energized or de-energized depending upon the position of the fail-safe selector on the probe’s electronic circuit board. A change of as little as .5 pico-farad is all that is necessary for the probe to sense the presence of material.

Click here for more information on the TrueCap MK-2 Level Sensor or contact Monitor Technologies LLC at
Tel.: 800-766-6486 in the USA and
Tel.: 630-365-9403 worldwide.

 

>>Download TrueCap Product Bulletin #413

>>Click here to learn more about other Point Level Switches from Monitor Technologies


 

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