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September 2004: SecureCare(sm) • Air Pad


SecureCare Delivers Knowledge at No Charge

Elburn, IL. — Monitor Technologies’ SecureCareSM customer service will deliver “knowledge” this fall. Monitor will conduct a two-part web seminar in November/December 2004, which will provide an overview of the advantages and disadvantages of various technologies used for the continuous measurement of bulk solids and powders. This free seminar is designed to help you eliminate the waste associated with misapplications, and eliminate a good deal of frustration. This seminar will discuss:

• Weight & cable
• Ultrasonic
• Wave-Guided and Through-Air Radar
• Laser
• Load Cell and Strain-Gauge Weighing Systems

While this seminar will not be an in-depth review of the principles of operation of each technology, it will make it easier for attendees to assess the compatibility of these technologies with a specific application, estimate the “real world” performance, and make cost effective decisions. Only generic information will be presented, that will not reflect any particular manufacturer or brand.

Joe Lewis, Monitor’s Vice President of Sales and Marketing, will present this two-part seminar. Each broadcast will be approximately 30 to 40 minutes in length. A white paper, upon which the seminar is based, will be made available to all attendees.

If you are interested in attending Monitor’s Fall seminar, just go to, click the “For Engineers” tab on the home page, and follow the instructions to register. You will receive your invitation for the seminar via email.

Monitor’s first web seminar for 2004 was held on June 28th. It was titled “Accuracy of Continuous Level Measurement in Dry Bulk Solids Applications”. If you missed this seminar, you can download a copy of the Power Point presentation, or download the seminar itself from the Monitor website.

Proximity Switch
Install in
Tight Spaces and Low Cost

Elburn, IL. — Monitor’s capacitance-type proximity switches are ideal for low cost level detection and for installation in tight spaces. They are easy to install and calibrate.

These devices are used to detect the presence or absence of bulk solids and have round M30 threaded housings. The thermoplastic polymer enclosures have an IP67 rating.

Two models are available. The Model PAC-30U accepts 20 – 265 VAC (45-65 Hz) power and is switch selectable for normally open or normally closed operation. The Model PDC-30 accepts 10-40 VDC power and is available in PNP or NPN configuration.

All capacitance-type proximity switches from Monitor offer adjustable sensing distance from 4 to 25 mm, and carry Monitor’s two-year warranty.

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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