Maretron SAE 5-Bolt Pattern Focus Tube w/Dead Band Eliminator

The Maretron SAE 5-Bolt Pattern Focus Tube with Dead Band Eliminator is a precision measurement accessory designed to expand the operational range of Maretron ultrasonic tank level monitors on vessels with non-displacement hulls. This focus tube assembly allows TLM100 and TLM150 tank level monitors to deliver accurate readings at vessel angles up to 15° of pitch or roll—more than double the 6° capability of the sensor alone—making it essential for serious offshore and coastal boaters who need reliable fluid level data in rough sea conditions.

The integrated dead band eliminator component raises the measurement focal point 2 inches above the tank's top surface, enabling accurate level readings even when fluid reaches the maximum fill line. This eliminates the blind spot common to direct sensor installations and prevents false low-level alarms during normal operation. The SAE 5-bolt mounting pattern ensures compatibility with standard marine tank fittings and provides secure, vibration-resistant attachment. Constructed to withstand the corrosive marine environment, the focus tube maintains measurement accuracy across freshwater and saltwater applications. Its 43-inch overall length fits typical marine tank configurations without requiring extensive hull modifications.

This accessory is intended for recreational and commercial vessel operators who depend on accurate fuel, water, or waste tank monitoring. Whether outfitting a fishing vessel that operates in offshore conditions, a cruising sailboat that encounters significant heel angles, or a commercial workboat requiring reliable tank management systems, the Maretron focus tube eliminates the operational guesswork associated with standard sensor installations. It pairs directly with Maretron's TLM100 or TLM150 ultrasonic monitors, integrating into established marine network systems for real-time tank status display on compatible chartplotters and helm displays.