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Integrity in All We Do

SJE Rhombus (S.J. Electro Systems, Inc.) was founded on July 2, 1975 by Steve Johnston. Steve wanted to develop a way to warn Minnesota residents when their septic system holding tank needed pumping. The pioneering efforts of Steve brought forth the first Tank Alert® alarm and Sensor Float® control switch. Today, over 40 years later, SJE Rhombus has grown into a leading manufacturer of reliable, trouble-free liquid level controls for the water, wastewater and sewage industries throughout the United States and Canada, as well as into global markets.

SJE Rhombus offers a wide variety of control products for residential, commercial, municipal, and industrial markets.  From control panels utilizing embedded circuit board technology, to complete control and monitoring systems designed and built to individual specifications, SJE Rhombus represents the most reliable integration of engineering and manufacturing capabilities in the industry.

New product designs endure extensive in-house and field testing before submittal to recognized independent laboratories for safety testing and approval. Each product is constructed of materials of the highest quality with expert workmanship and delivered in responsive lead times. This commitment to quality ensures you a dependable, trouble-free product. SJE Rhombus is so confident in the superior quality and performance of our controls, that nearly every catalog product leaving the factory is backed by a five-year limited warranty.

Located just outside of Detroit Lakes, MN (the heart of the lakes region in West Central Minnesota), SJE Rhombus now occupies over 65,000 square feet of manufacturing and warehouse facilities. Our employee-owners (in 1998 SJE Rhombus became a 100% employee-owned ESOP company) have excellent work habits which creates an atmosphere of high integrity and dedication to being the best in the industry.

Learn more about founder Steve Johnston and the SJE Rhombus story by viewing our company history section.


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