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 The
probe vibrates using piezoelectric element at the end of the probe.
This piezoelectric element sets up a vibrational frequency. Contact
with the material dampens the probe's vibration. This change is
detected by an acceleration pickup and converted to a relay output.
Single-rod units are used in solids, while tuning-fork probes
can be used in liquids or solids. Vibrating probes are typically
mounted on the top or side of storage vessels for dry bulk materials
or liquids. This all-electronic point-level technology has two
advantages. One is that it does not require calibration for the
particular material. The other is that these probes can sense
extremely lightweight materials such as EPS or fluffy regrind—typically
down to densities of 2 to 3 lb./cu ft, although some instruments
can sense material as light as 1.3 to 1.5 lb./cu ft.
Vibratory Level Technology Advantages:
- No
calibration required
- Can
sense extremely light materials
- No
Calibration
- Unaffected
by electrical and physical properties
Vibratory Level Technology Disadvantages:
- Unpredictable
with foam
- Product
Buildup
- Moving
Parts
- Not
very rugged
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