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July 2002: Diaphragm • PZP


Diaphragm Switch
Economical and Reliable
Point Level Detection

Elburn, IL - Monitor Technologies' BINATROL® diaphragm switch is a durable and low-cost solution for detection of product levels in dry material storage bins.

The units can be used to eliminate bin overflow, maintain a predetermined material level, indicate plugging of chutes or conveyors or provide any of a number of level control functions.

The flush mount, non-intrusive BINATROL® units are ideally used when vessel size or internal clearance is limited, or where protrusion into a vessel is not acceptable. All installation and servicing, including diaphragm replacement and sensitivity adjustment, can be done from outside the vessel.

Monitor offers a variety of diaphragm bin monitors that can be configured with various switch sensitivities, diaphragm materials and approval ratings.

Model PZP
Versatile Point Level Sensor

Elburn, IL - The PZP vibratory level sensor is available in multiple configurations making it the perfect solution for a wide variety of applications.

This sensor requires no calibration and offers a superior probe design over similar devices. The unique single-prong probe design minimizes material buildup problems associated with tuning fork designs. The reinforced stainless steel probe construction allows use with a wide range of materials.

The ability to detect a wide variety of material densities makes the PZP an attractive solution for many 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).

The PZP offers many advantages over alternative technologies. The vibrating probe principle can eliminate problems associated with temperature, humidity and material changes, while providing state-of-the-art electronic reliability and accuracy.

Spotlight: RF Capacitance Level Sensor
TrueCap Level SensorsTrueCap Light  
TrueCap® MK-2
Advanced RF Capacitance Level Probe

The TrueCap® Model MK-2 RF Capacitance point level probe is designed to provide a superior and stable sensitivity threshold making it suitable for a variety of powder / bulk solids and some liquid or slurry applications.

Advanced features of the Model MK-2 include:
> Automatic immunity to material build-up on the probe by its driven shield design
> Push-button calibration
> Enhanced temperature compensation
> Maximized reliability via smart sensing algorithms like “self-validating” fail-safe protection
> Visible status LED on ordinary location units
> Versatility through a variety of configuration options including: hazardous location version, split architecture design, quick-connect process connection, stub probe, cable extensions, solid extensions, Nylon® probes, Ryton® - equiv. probes, etc.

A practical application for the TrueCap would be to use this level sensor where a residual material build-up on a different sensor would cause a false material level indication.

Principle of Operation for the TrueCap RF Capacitance Level Probe:
The vessel wall and the active probe element establish an impedance reference between each other when exposed to air which has a dielectric constant of 1. When materials with a dielectric constant greater than 1 are in close proximity to the probe, the impedance of the sensing field between the sensor and the vessel wall will change. Once the amount of change exceeds a threshold that was electronically determined during the calibration process, an output relay will either be energized or de-energized depending upon the position of the fail-safe selector on the probe’s electronic circuit board. A change of as little as .5 pico-farad is all that is necessary for the probe to sense the presence of material.

Click here for more information on the TrueCap MK-2 Level Sensor or contact Monitor Technologies LLC at
Tel.: 800-766-6486 in the USA and
Tel.: 630-365-9403 worldwide.


>>Download TrueCap Product Bulletin #413

>>Click here to learn more about other Point Level Switches from Monitor Technologies


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