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History of Monitor Technologies

Monitor Technologies LLC was founded by George Gruber in Port Sanilac, MI in 1958. The company was then known as Sanilac Manufacturing Company and had a product line consisting of two (2) rotary paddle units, the Model M and MX. In 1960, Mr. Gruber moved the company to Minden City, MI and adopted the name Monitor Manufacturing. This name would define the company for the next 38 years.

By 1965, Monitor’s product line consisted of three (3) rotary paddle units and one (1) model of a diaphragm switch unit. Over the years the product line grew and by 1980 consisted of twenty-two (22) products used almost exclusively for the level detection of powder and bulk solids materials. Our customer base grew from approximately 130 accounts in the early 1960’s to over 10,000 worldwide.

Since 1980, other products have been added through acquisition and internal development. In 1965, Monitor was acquired by D K Manufacturing. Monitor’s sales offices moved to D K’s location in Batavia, IL while the manufacturing operations remained behind in Michigan. Several years later in 1972 D K Manufacturing, including Monitor, was acquired by CRL. In 1977, Monitor had outgrown both the Batavia and Minden City locations and the entire Monitor Manufacturing operation was consolidated in a new facility built in Elburn, IL where we are located today.

Monitor’s product line continued to expand. RF Capacitance and Vibratory technologies were added to its existing mechanical and electromechanical product lines for point level monitoring. The company’s weight & cable inventory monitor was developed and became an industry standard. Some product lines that didn’t fit Monitor’s focus on instrumentation for powder and bulk solids were sold off in the early 1990’s, and the Company went through a management buyout and changed its name to Monitor Technologies LLC in April of 1998.

In the late 1990’s and into the first decade of the new millennium new technologies were added through development, such as our SiloPatrol® smart weight & cable inventory monitoring system and SiloTrack™ PC-based inventory management software. Other new products were brought to the market during this time frame through strategic partnerships. Monitor’s focus on quality was first exemplified in 2000 when it achieved certification to ISO 9001 standards.

Monitor’s current focus remains that of instrumentation for powder and bulk solids applications. Monitor is committed to be second-to-none in delivering the highest degree of customer satisfaction delivered through every contact our customers have with us. We will not accept anything less. Our SecureCaresm customer service is dedicated to this end.

Today, Monitor Technologies LLC offers superior solutions in level monitoring, solids flow detection, particle emission monitoring and bin aeration. Give us a call today and let us put our creative solutions to work for you!


TrueCap Level SensorTrueCap 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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