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WATCHMAN Trailer Advanced Wheel-End Sensing Technology

Release date: 10/29/2019

For Immediate Release

For more information contact:
Mark Slingluff
Director Global Marketing and Communications

Hendrickson Launches WATCHMAN Trailer Advanced Wheel-End Sensing Technology Powered by Sensata Vehicle Area Network

ATLANTA (October 29, 2019) – Hendrickson announces the introduction of the WATCHMAN advanced wheel-end sensor technology for trailers that operates on the vehicle area network developed by Sensata Technologies (NYSE: ST). The initial product offering will include trailer tire pressure monitoring, wheel-end temperature and wheel-end vibration data that will be communicated to the fleet through the tractor telematics system pulling the trailer.
Hendrickson is working with the Society of Automotive Engineers (SAE) to develop standards for the industry in the communication of data and fault codes for trailer wheel-end information.

“This common platform will allow the new Hendrickson WATCHMAN wheel-end sensor to be used by OEM manufacturers to provide crucial data from the trailers to their customers,” says Omar Fernandez, director of marketing at Hendrickson Trailer Commercial Vehicle System.
Tire pressure monitoring, coupled with the inflating, relieving, and equalizing capabilities of TIREMAAX® PRO, already on the market, will allow fleets to minimize tire wear and maximize fuel economy by managing the tire pressure on their trailers.
Early warnings of vibration or heat in the wheel-ends will minimize the cost of repairs and maintenance of these crucial components.  The WATCHMAN wheel-end sensor kit will include four battery powered wheel-end sensors that transmit wireless RF signals to the Sensata gateway module, which collects data from the sensors and will be used as the communication hub for the trailer. The information will be transmitted from the Sensata gateway module to the tractor electronic control unit (ECU), either via a wireless link or hard wired, and will utilize the SAE J1939 communication protocol.  Additionally, the wheel-end data output from the Sensata gateway module will be made available to on-board trailer telematics devices for transmission to the fleet’s back office.
Future enhancements planned for Hendrickson WATCHMAN technology series include adding advanced wheel-end algorithms into the Sensata gateway module as well as offering new sensors on brake pads to communicate brake pad wear and suspension sensors to provide load sensing for each axle on the trailer.
Initially, this wheel-end sensor technology will be offered with Hendrickson HXL Extended Life wheel-ends and will launch in early 2020 with a limited quantity release and full production later in the year.
Hendrickson, a Boler company, is a leading global manufacturer and supplier of medium- and heavy-duty mechanical, elastomeric and air suspensions; integrated and non-integrated axle and brakes systems; tire pressure control systems; auxiliary lift axle systems; parabolic and multi-leaf springs; stabilizers; bumpers; and components to the global commercial transportation industry. Hendrickson, based in Woodridge, Ill., USA, continues to meet the needs of the transportation industry for more than 100 years. Visit Hendrickson at
Sensata Technologies is one of the world’s leading suppliers of sensing, electrical protection, control and power management solutions with operations and business centers in 11 countries. Sensata’s products improve safety, efficiency and comfort for millions of people every day in automotive, appliance, aircraft, industrial, military, heavy vehicle, heating, ventilation, and air conditioning, data, telecommunications, recreational vehicle, and marine applications. For more information, please visit Sensata’s website at