Point Level Measurement

The LP-500ST is a vibrating rod used for level measuring. This series of vibrating rod level switches are robust instruments designed for low and high level indication of granules and powders with a minimum of 3.12 lb/ft2 (0.05 kg/dm3) density. The LP-500ST is a vibrating rod that senses material using a mechanical principle and is not affected by the dielectric constant of the material. This makes it an ideal sensor in plastics, dust, shavings, cement, lime, sand, grain, feed, sugar, and many others.

The LP-500ST technology is based on a vibratory technology where the electronic circuit excites the vibration in the rod or probe. When the material reaches and covers the rod vibration stops, when the material leaves the rod it returns to vibrate freely. The electronics senses the change of vibration and gives output signal after a selected delay.

Specification Sheets:

Technical Specification

Process Connection1½” NPT
Power Requirements20-255 V AC/DC
Power Consumption≤ 2.5 VA / 2 W
OutputsMain Relay 8A SPDT @ 250 VAC, AC 1
Pressure Rating362 psi (25 bar); cable extended 87.0 psi (6 bar)
Time DelayField adjustable; 2 or 5 seconds
Fail SafeField selectable, high/low level
Sensitivity3.12 lbs/ft3 (0.05 kg/dm3)
Conduit Entry(2) 1/2” NPT; (2) M20 x 1.5

Product Details


With universal power and no need for calibration, the Pulse Point II vibratory fork level sensor can be installed quickly and with ease. The power supply can be either AC or DC and is non-polarized which permits wires to be connected without regard to polarity, removing these issues during installation.


Unique to the Pulse Point II vibrating fork level sensor is ultra-high sensitivity where materials with densities down to 0.5lbs/ft3 (8kg/m3) can be sensed with reliability in both horizontal and vertical orientations.

Technology: Vibrating Rod
Applications: Single rod for detecting bulk solids


The process connection is a standard 1-1/2" NPT connection, and both the time delay and fail-safe are field selectable to adjust to changing environments or materials.


The LP-500ST is available for standard temperatures up to 230°F (110°C), for high temperatures up to 320°F (160°C) or with extensions, either pipe or cable.


Specification Sheets: