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November 2002: SafePoint® • MK-1


For Critical Continuous Operation

Elburn, IL - Monitor Technologies' SafePoint® Fail-Safe Rotary Paddle Bin Level Indicator provides the ultimate in performance in point level applications. This state-of-the-art rotary paddle features patent-pending magnetic sensing technology and a unique housing design making it the most reliable and technician-friendly sensor of its kind.

SafePoint utilizes Monitor's magnetic sensing technology to continuously detect both material presence and operational status. The rotation of the unit's shaft is monitored by the detection of a magnetized rotating disk (patent pending). Use of magnetic sensing techniques eliminates problems that can occur with the optical systems of other brands. Material sense and fail-safe outputs are provided on all models.

The unique housing design features a twist on/off cover, so there are no more bolts to drop or lose. A local status indicating light is located on the top of the unit for ordinary location models. The SafePoint unit also has two conduit entrances for wiring access.

In addition, unlike most paddle units, the SafePoint incorporates a feature that automatically shuts off the motor when the paddle is impeded. This extends the life of the unit and minimizes maintenance. The SafePoint is also available with hazardous location approvals.

TrueCap® MK-1 Family
Economical MK-1 Ideal for
Many Point Level Applications

Elburn, IL - The TrueCap® Model MK-1 RF capacitance point level sensor provides reliable and economical point level readings in many applications including free flowing dry bulk materials and many liquids.

The MK-1's superior 0.5pF sensitivity is unusually high for such an economical probe. Unlike other inexpensive RF based products, the MK-1 allows users to easily adjust the sensitivity level for use in a wide range of applications.

A fail-safe function is another feature of the MK-1. If a power failure occurs, the relay drops out into the alarm condition. This alarm provides additional security against overfilling or emptying of a vessel due to sensor failure.

The MK-1 requires minimal maintenance making it the most economical RF sensor in the market. The MK-1, with no moving parts to wear out or break off during normal operation, and no repair costs associated with motor burnout and broken or damaged paddles, can also provide a low-cost transition from mechanical/electromechanical point level monitors.

Monitor's TrueCap® line of RF capacitance point level sensors, which also includes models MK-2 and MK-2e, is designed to provide a high level of sensitivity, stability, and durability required for powder and bulk solids applications. All TrueCap sensors are covered by 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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