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III.
PRODUCT DESCRIPTION
FUNCTION
The LP
II Series units are electronic, vibratory level controls designed for use in powders and granular solids. A
®
vibrating "tuning fork" is used to sense the presence of material.
The tuning fork contains two piezoelectric crystal assemblies: one "transmit" and one "receive". The Piezo
crystals convert electrical signals to mechanical movement, and vice versa. High-voltage DC is applied to the
transmit crystal cause the tines of the fork vibrate. This vibration is mechanically coupled to the receive crystal
which produces a small electrical signal. The receive crystal will produce low voltage as long as the fork is
vibrating.
If the fork stops vibrating, as it does when in contact with material in the vessel, the receive pulses stop. The
electronics recognize this loss of signal and cause the main relay to change state.
APPLICATIONS
Unlike radio frequency and capacitance technology sensors, the LP II Series devices sense material using a
mechanical principle and are therefore not affected by the dielectric constant of the material. These are ideal
sensors in plastics, dust, shavings, and low-density powders and food. Material as light as 0.5 lbs/ft
can easily be sensed. LP II can be used in any free flowing dry material up to
FEATURES
Multiple mounting configurations, forks, and coatings available to suit almost any application
Universal input power; AC or DC (see specifications for input ranges)
No calibration required
Adjustable time delay
Selectable fail-safe operation (high or low level)
Adjustable Sensitivity
Build-up Detection - ADVANCED ONLY
LVP180613 Rev. B
3
/
" (9.525 mm) in particle size.
8
3
www.bindicator.com
(8 kg/m
)
3
3
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