SJE-Rhombus was founded on July 2, 1975 by Steve Johnston. Today, over 35 years later, we have 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 global markets.
We offer 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.
We are based out of Detroit Lakes, MN, and are proud to be a 100% employee-owned ESOP.
Howman Engineering is a UL-508a registered panel shop that designs and assembles industrial control systems. We employ highly trained professionals to ensure that all panels are designed and assembled to meet your specifications. We can help get your product UL listed, create a new product, or...
ARC ARMOR...YOUR SHIELD IN THE FIELD. The safe, innovative, multiple compartment ARC ARMOR® System reduces the risk of injury resulting from arc flash and electric shock by limiting access to electrical equipment capable of producing arc flash incidents. The control and power circuitry are... Read More
The KwikSwitch™ quick release float switch connection system is designed to be installed directly in a wet well. The 4-port manifold easily connects 1-4 KwikSwitch™ float switches for level control applications. The KwikSwitch™ system improves reliability, and significantly reduces installation... Read More
The ECO SMART STATION® is housed in the innovative, multiple compartment ARC ARMOR® enclosure, reducing the risk of injury resulting from electric shock and exposure to arc flash. The control and power circuitry are isolated in separate compartments, thus preventing unnecessary exposure of arc... Read More