Maretron TFT-5H Non-Displacement Hull Focus Tube SAE 5-Bolt

The Maretron TFT-5H is a non-displacement hull focus tube designed as an essential accessory for TLM100 and TLM150 ultrasonic tank level monitors. This focus tube enables accurate tank level measurement on vessels with planing hulls or sailboats that experience extended periods of pitch or roll beyond 6 degrees.

Key Features:

• SAE J1810 5-bolt mounting pattern for direct installation to standard tank openings
• Extends operational pitch and roll tolerance from 6° to 15° for improved accuracy on non-displacement hulls
• Directs ultrasonic waves straight down to fluid surface and back, compensating for hull angle
• Field-trimmable design allows customization to tank depth (trim to reach 1" above tank bottom)
• Includes gasket and focus tube cap for proper sealing and signal reflection
• Compatible with diesel, fresh water, waste water, black water, and oil tank applications
• Constructed from durable materials suitable for marine environments

The TFT-5H mounts between the tank opening and the TLM100/TLM150 sensor component, creating a tube that guides ultrasonic signals directly to the liquid surface regardless of vessel attitude. The included focus tube cap ensures proper signal reflection even when tank bottoms are uneven, and helps keep solids away from the transducer in black water applications. Installation requires trimming the tube to the appropriate length using a metal-cutting blade, then securing with mounting hardware (torque to 10-15 in-lbs). This accessory is essential for powerboats with planing hulls that spend significant time with the bow pitched up during operation.