These sensors may be used for high, mid, and low-level detection in bins, silos, tanks, hoppers, chutes, and other types of vessels where materials are stored, processed or flowing.
How Capacitance Probes Work
Capacitance sensors operate by detecting the presence or absence of material in contact with the probe, sensing minute changes (as low as 0.5 picofarads) in capacitance caused by the difference in the dielectric constant of the material versus the air.
Get to know Capacitance Probes
Capacitance probes are available with a wide range of options.
If your facility has an explosion-proof requirement, you will need a capacitance sensor designed and certified for hazardous location applications. You can specify probes with special probes and connections for use in sanitary applications or those that need to meet USDA, FDA, or 3-A requirements.
A Probe Type for Every Purpose
An extended, flexible cable extension can be attached to a capacitance probe in instances when the sensor is mounted on top of the tank and will be used for high, mid, or low-level detection.
Try it at Cement Plants:
The flexible cable can easily shift, or swing and materials are added or removed without the damage that might occur to a rigid probe.
A flush-mounted probe can be used in narrow or space-constrained areas or in applications where material flow or bridging may damage a standard probe.
Consider it in Mining:
This non-intrusive sensor won’t get in the way when mounted on a bin wall, conveyor housing, or chute when used in coal, gravel, or foundries.
When the vessel is small or has internal obstructions, a bendable probe can be used to avoid obstructions while still allowing adequate probe surface area to detect the presence or absence of material.
Try it in Food Processing:
A bendable probe can be cut and bent to avoid mixers and blenders in tanks processing solids and slurries used for mixing and blending ingredients.
A solid 1” diameter shaft provides extra surface area for level detection and withstands temperatures up to 500°F (260°C).
Popular at Power Plants:
This probe is great for high-density materials that are heated in the production process. Fly ash and clinker or coal storages are excellent applications.
Distance electronics up to 75 feet away from the sensing probe to protect them from excessive vibration, heat, or hostile conditions.
Think about Clinker:
Made from heated limestone and minerals, this binder for cement is made under harsh conditions. Measure it confidently with the electronics set away from the process and housed safely in a protective enclosure.
Miniature probes are ideal for smaller vessels and tight spaces such as chutes, conveyors, pipes, or small hoppers.
Ideal for Food and Pharmaceuticals:
With hygienic options, they are suitable for tanks, vessels, hoppers, or feeders containing liquids or bulk solids used in the making of foodstuffs, beverages, prescription, and over-the-counter medications.
Words of Wisdom about Probes
“A capacitance probe can be a great next step if you are using a rotary and want to move up to the next level.”
“When side mounting a probe, you will want to keep the probe length short to avoid material bending the probe. A 6-1/2” probe generally works well. Better yet, use a heavy-duty probe, like the one commonly used in power plants or mining operations.”
“It’s best to talk with someone at the manufacturer before you spec in a capacitance probe. You might not know you should avoid using probes in low dielectric materials, as they may not sense them.”
“If you are changing materials frequently in a silo, you may need to recalibrate a probe. A rotary may be a better solution.”
When it comes to probe selection, there are Delrin, Teflon, 3A, bare, shielded, unshielded, hanging, and flush options. “A Delrin probe is a great all-purpose choice. If you are using a probe in hot temperatures or chemicals, a Teflon probe may be a better alternative.”
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