Our team has an abundance of reed switch knowledge that sometimes seems hard to contain. But here on our blog our engineers and leadership share their abundance of knowledge to give you an inside look at how we use our work ethic, creativity and passion to push the limits of sensor technology everyday. Whether we are examining how we prototype projects or imagining ways that a reed switch could help us save a little water at home, we live sleep and breath sensor technology and want to share our insights with you.

Previous Posts


Sensor Solutions for Natural Refrigerants

HSI Sensing is proud to provide ideal reed sensor solutions for the transition in refrigeration from hydrofluorocarbons (HFCs) hydrochlorofluorocarbons (HCFCs), and chlorofluorocarbons (CFCs) to natural refrigerants such as hydrocarbons (propane, butane, and cyclopentane), CO2, ammonia, water and air. See the challenges faced when using natural refrigerants: https://www.manufacturingtomorrow.com/article/2017/09/how-to-solve-the-challenges-of-using-natural-refrigerants-in-cooling-system-design/10361 HSI offers true hermetically sealed proximity & limit … Continued


Designing Sensors

I have been designing reed switches and proximity sensors to meet the needs of the multitude of applications that are out there for 40 years. The primary purpose of our sensors is to convert a mechanical motion to an electrical signal. The designs of these sensors can be very simple or really critical and complicated.


Food Chopper Safety

Safety systems are a common and important use of our sensors. Whether it is the presence of a specific tool, door closure or opening, locking mechanism secured or other safety measures, our sensors serve a critical role. 


Spot On the Most Magnetic Sensor

The new Spot-On sensor is designed like no other reed switch based proximity sensor.   There are sensor assemblies that feature internal magnets but none like this one.   


Danger Danger: Designing for Hazardous Locations

A few weeks ago, I found out that I would be responsible for designing a new line of sensors that were to be certified for hazardous locations according to UL 1203. Fortunately, one of my coworkers had done this recently on a different product, so he knew how to point me in the right direction.


The “BSL” (Bi-Stable Latching) Form C, SPDT Reed Switch

I have spoken of some of our products being “amazing,” and I don’t want to use this term so much that I diminish its impactful meaning, but another one of our products that is in this same category that I am surprised most people are not aware of is the “BSL” (Bi-Stable Latching) Form C, SPDT Reed Switch.


Behind HSI

Ryan Posey


Ryan Posey currently serves as CEO at HSI Sensing, formerly Hermetic Switch, Inc. Founded in 1968 by Posey’s grandfather, William Posey, HSI Sensing is a multimillion-dollar manufacturing company that designs, develops and manufactures reed switches, proximity sensors and other sensing technologies for clients around the world. It serves industries ranging from aerospace, agricultural, oil and...