Monitor PZP Vibratory Level Probe

The PZP offers many advantages over alternative technologies. The vibrating probe principle eliminates problems associated with temperature, humidity and material changes, while providing state-of-the-art electronic reliability and accuracy that requires no calibration. The unique single-prong probe design eliminates material packing problems and false signaling typically associated with the dual-prong "tuning fork" design.

The PZP's ability to detect a wide variety of material densities, including very lightweight materials, makes it an attractive solution for many applications.

Unique versatility for materials from 1.5 to 100 lb/ft(3)
Unaffected by environmental and material changes
Unique single-prong probe design
High and low applications/dust collector back-up protection
Multiple configurations for a wide range of applications

Principle of Operation:
The PZP utilizes piezoelectric technology to create a vibration and then constantly monitors the presence or absence of that vibration. Two piezoelectric crystals are located in the base of the probe. A signal is applied to one crystal at the frequency corresponding to the probe's self-resonance. The electrical excitation causes physical deformation of the crystal resulting in probe vibration. With no material present, the vibration of the probe is felt by the second crystal. This vibration causes physical deformation of the second crystal which generates a voltage to be analyzed by the electronic circuitry. With material present around the probe, the vibration is dampened, thereby minimizing the voltage generated by the second crystal. The output voltage is analyzed by the circuitry and the relay status changes accordingly.

Applications:
The PZP is often applied in ultra lightweight applications due to its exceptional sensitivity to materials as light as 1.5 LB/ft(3). However, the PZP is also a proven performer for materials up 100 LB/ft(3). Current applications range from 1.5 LB/ft(3) EPP (expanded polypropylene) beads to 100 LB/ft(3) clay. The PZP is ideal for applications where vessel content changes are common, since no calibration is required when material changes are made. The PZP can also provide dust collector back-up protection.

Features:
Versatility
The unique design makes the PZP immune to changes in many different variables including:
Vessel Contents
Material Composition
Density of Material 
Dielectric Constant
Particle Size 
Moisture Content
Temperature 
Pressure 
Humidity

Ease of use:
The PZP offers maximum ease of use to its users. PZP setup involves simply selecting the sensitivity and fail-safe settings, and requires no calibration.

Superior Probe Design:
The PZP offers a superior probe design over similar devices. The unique single-prong probe design minimizes material packing problems and false signaling that are typically associated with the dual-prong "tuning fork" design. Also, the vibration acts as a self-cleaning effect which can further eliminate problems. The reinforced stainless steel probe construction allows use with a wide range of materials.

Fail-Safe:
A switch permits selection of either high or low fail-safe. In the event of a failure, the relay drops into the mode which denotes an alarm condition. This alarm provides additional security against overfilling or emptying of a vessel.

Electronics Options:
The PZP's electronic module is available in either 115/230 VAC or 24 VDC operation.