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August 2004: DustAlarm • SafePoint™


Interactive Product Guide
Versatility Meets
Technology with Broken Bag Detectors

Elburn, IL. — Monitor Technologies’ DustAlarm“ Broken Bag Detector uses time proven triboelectric technology to provide economical dust monitoring. It can be used for broken bag and leaking filter detection in bag houses, cartridge collectors, cyclones, or any other dust collector.

Dust particle collisions with the DustAlarm’s stainless steel probe generate an electric signal. The electronics continuously monitor for this signal, and then provide an alarm output to indicate changes in filter condition. The DustAlarm lets you know when to replace filters, and protects blowers from damage.

DustAlarm is designed to minimize false signals that could occur during normal operations and cleaning cycles. The electronics include sensitivity, alarm level and time delay adjustments. A multi-colored LED within the electronics simplifies set-up and provides local indication of an alarm state.

A rugged NEMA 4 housing delivers optimal protection for the DustAlarm electronics, as well as easy access to all adjustments. Plug-in terminal blocks and cable glands simplify wiring and commissioning. The electronics can be integrally mounted to the DustAlarm’s stainless steel probe, or remote mounted, as an option for high temperature applications. The probe has a specially designed insulator to prevent false signals due to product build-up. A quick disconnect mounting coupling furnishes easy installation and removal for maintenance, should cleaning ever be required.

Monitor’s DustAlarm saves you money by eliminating unscheduled down time for filter bag replacement. DustAlarm also helps to comply with the Clean Air Act and other federal regulations by allowing dust to be reclaimed prior to being released to the environment.

DustAlarm delivers reliable operation for a wide range of powders and bulk solids, as well as the versatility to meet the needs of a variety of industries.

Flo-Pad Aerator
Unmatched Durability, While Truly Failsafe!

Elburn, IL. — Monitor Technologies’ SafePoint™ Rotary Paddle Level Indicator is a “TRUE” failsafe point level indicator that provides economic and reliable point level measurement for dry bulk materials stored in bins, hoppers, silos and tanks. State-of-the-art features and rugged construction make SafePoint the most durable and technician-friendly rotary paddle sensor available today.

SafePoint utilizes Monitor’s patented magnetic sensor technology to continuously detect both material presence and operational status. Magnetic sensing is simple, and eliminates problems that may occur with fouling of the optical systems of other brands. SafePoint electronics include a microcontroller that monitors shaft and mounting plate rotation, and that performs self-diagnostics for reliable and consistent operation. Separate outputs are available for material sense and fault conditions, making SafePoint a “truly” fail-safe device.

SafePoint automatically shuts off the drive motor when the paddle is in a stalled condition due to material presence. The motor is reactivated when material level drops. This feature greatly extends motor life.

SafePoint also has a unique housing design with a twist on/off cover for easy access, and two conduit entrances for easy wiring. Versions are available for installation in ordinary or hazardous locations. Local indication of material presence and operational status is provided on SafePoint units suitable for installation in ordinary locations. There is even a SafePoint option for high temperature service (up to 750o F/300o C).

A wide range of features, options and accessories provide unmatched versatility for the SafePoint Rotary Paddle Level Indicator to make it compatible with a host of applications, for a variety of industries.

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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