( click here )


Bulk Solids Processors Save $ Thousands Using SafePoint®

Cutaway of SafePoint Self-Validating Bin Level Sensor

Nearly 60% of all level sensors are point-level sensors. These types of sensors are critically important to the profitable and safe operation of your facility, whether they are used for high-level or low-level detection or for some other purpose. If a high-level sensor in one of your vessels fails what will happen? You may overfill your vessel or damage other equipment and back-up material into the fill line or clog filters and vents. You can have a mess to clean up, and to explain, and repairs to make. What’s the outcome if a low-level sensor fails? Your production line can unexpectedly run out of material and you may incur expediting charges to replenish your raw material inventory. If a point-level sensor fails without warning, it isn’t going to be pretty and you will have a headache and a costly situation on your hands.

Given the outcome of a point-level sensor failure you’d think they would be very costly, but they’re not. The average unit price is less than $300.00 (US), according to industry research sources. This expense pales by comparison to the cost of the effects of a point-level sensor that fails without warning. So, how do we go about preventing the expense associated with this type of point-level sensor failure? What is needed is a sensor that is “safe” to use, in regards to the outcome of its failure. This means a “fail-safe” sensor. What does “fail-safe” mean? I found a definition listed by Wikipedia. The website is and it is a free online encyclopedia. According to the definition offered, “fail-safe” is a term used to describe a device that will fail in such a way that it will not cause harm or will minimize the harm caused to process and personnel. Further definition indicates that a “failure” is when the device is not able to perform its intended function.

For point level sensors a failure can occur for numerous reasons, including external and internal causes. An example of an external failure is a power outage. While this may be infrequent, and you probably will have other problems to deal with besides your sensors, a power failure will mean your level sensor will not operate. Internal failures are potentially more numerous given the number of components that make up a sensor and the method of operation of each type of sensor. However, point level sensor manufacturers have long defined fail-safe in regards to the sensor output for power supply failure only. Most point level sensor literature and specifications will claim the sensor to include “fail-safe high/low output selection”, meaning that if the power to the sensor fails, the output of the sensor will go into the alarm mode.

However, this customary “fail-safe” function offered by level sensor manufacturers does not protect “against the effects of failure of the equipment”. We have a gap between protecting against the impact and results of sensor failure, and what most suppliers have been providing in regards to a “fail-safe” device. How can we meet what is needed and close the gap? By using self-validating sensors and understanding why they truly are safe, no matter what the failure mode may be.

A “self-validating” sensor is a sensor that provides both indication of a measured process variable and indication of the validity of the measured variable or intended function that the sensor performs. In our discussion here, a “self-validating” point level sensor detects the presence/absence of material at the sensing element and continuously monitors and checks it’s own ability to perform it’s sensing function. The “self-validating” point level sensor provides two outputs that ideally are monitored independent of each other. The first indicates material presence/absence, the second output indicates the health status of the sensor itself.

Self-validation is important if you want to ensure the elimination of the effect of unexpected sensor failures. While so-called fail-safe sensors will initiate an output change to the alarm state (supposedly a “safe state”) upon power system failures, ONLY a self-validating sensor will indicate the status of its ability to perform its function based on continuous internal diagnostics as well as the state of its external power supply. This is an extremely important difference to understand. Maximum protection is achieved using self-validating sensors, not “fail-safe” sensors that only take action upon power failure.

Self-validating point levels sensors are the best alternative to fully protect against the effects of unexpected point level sensor failure. A self-validating safe point level sensor ....... $300.00, eliminating clean-up and maintenance costs ........ priceless!




3rd Quarter Issue of "On the Level"

Cement Producer Uses Flexaar™: Continuous Level Systems to Provide Accurate, Real-time Measurements of FlyAsh

Tech Tip - Informational Resources Available

SecureCare PROFILE: Cathie Bonine, Accounting manager

Trivia Contest


Web Seminars

Do you want more information on our most recent Web Seminar?
Go to our Web Seminars Page, download recorded presentations, the white papers created and the original powerpoint presentations.

Go check it out! >>

Product News

Flexar™ Guided Wave Radar

SafePoint® Self-Validating Point Level Sensors Warn of Failure

In the processing, production and storage of powders and bulk solids the reliable monitoring of high level conditions in bins and silos is important.  If the level monitor fails to function properly, large costs due to overfilling of the silo and disruptions of your process can occur.  This is why the SafePoint® self-validating point level sensor from Monitor Technologies is the best choice for powder and bulk solid processors worldwide. 

The SafePoint incorporates patented use of Hall-effect technology, dual outputs to indicate both material presence AND unit health, and microcontroller technology along with the industry leading features of Monitor’s standard rotary paddle point level sensor, to continuously protect bulk solids processing and storage from the effects of unknown sensor failure by providing immediate notification of a sensor failure and confirmation of proper operation. 

Bulk solids processors worldwide use the SafePoint to reliably protect against overfilling.  The SafePoint is a "true fail-safe" self-validating level sensor and can save maintenance and plant personnel time and help avoid the costs of these untimely spills and overfill conditions.  The SafePoint level sensor detects electrical and mechanical failure modes that might keep the unit from operating properly.  The SafePoint is a relatively low cost fail-safe level sensor with a premium of only about $100 US over standard rotary paddle bin level indicators.  It is equipped with state-of-the-art electronics and patented technology, an industry-leading screw-on/off cover, two conduit entrances, local indication and separate outputs to continuously monitor its health status as well as the presence and absence of process material. The SafePoint is designed specifically for applications with powders and other bulk solids and can be provided for use in Class I and II hazardous areas with CSA (for North America) and ATEX certifications.

Monitor Technologies LLC is a leading pioneer in level measurement and monitoring instrumentation for the worldwide powder and bulk solids industries.  Celebrating its 50th anniversary in 2008, the experience and market knowledge gained over five decades has earned Monitor a reputation for providing high quality and reliable product solutions. Monitor is located in Elburn Illinois in the United States.

SafePoint is just one of the many level measurement and monitoring devices designed and manufactured by Monitor Technologies LLC in Elburn, IL.  For additional information please visit, and our weblog at Here.  You can also contact us at 1-800-766-6486 in the USA or 1-630-365-9403.



>>Download Product Bulletin 253