TruDesign Tank Monitor Sender – Short (Flange Mount Level Sensor)

Monitor your onboard tank levels with confidence using the TruDesign Tank Monitor Sender – Short, a simple and highly reliable solution for detecting when your tank is full or empty.

Designed and manufactured in New Zealand, this float switch sender is commonly used in toilet holding tanks, grey water systems, and freshwater tanks, providing a clear warning when levels reach a preset point. When connected to a compatible display panel, it triggers an alert light to prevent tank overflows or dry running systems .

The system uses a mechanical float design with no electrical components in contact with the liquid, reducing maintenance and improving long-term reliability . The float can also be reversed, allowing you to configure the system to indicate either “tank full” or “tank empty”, depending on your setup .

Constructed from materials resistant to chemicals commonly found in marine sanitation systems, this sender is ideal for harsh marine environments and long-term use .

The short (flange mount) design makes it perfect for installations where internal tank depth is limited, while still providing accurate and dependable level indication.

Key Features

• Short sender design – ideal for shallow tanks and compact installs
• Reliable float switch operation – simple and proven technology
• Prevents tank overflow – alerts when tank reaches set level
• Reversible float – configure for full or empty indication
• No electrical contact with liquid – low maintenance and durable
• Chemical-resistant construction – suitable for waste systems
• Low power consumption – efficient for onboard systems

Specifications

• Brand: TruDesign
• Product Type: Tank level sender / float switch
• Model: Short (Part #90311)
• Voltage: 12V / 24V DC compatible
• Mounting: Flange mount (top of tank)
• Installation Hole Size: ~28mm (1 1/8")
• Trigger Level: Approx. 76mm ±2mm
• Materials: Chemical-resistant composite
• Use: Non-flammable liquids only (not for fuel)

Ideal Applications

• Marine toilet holding tanks
• Grey water and freshwater tanks
• Caravan and RV tank monitoring
• Overflow prevention systems

This sender is widely used because it provides a simple, dependable early warning system, helping avoid messy overflows and potential system damage.

Why Buy from Barton Marine NZ?

• Trusted NZ supplier of marine plumbing & sanitation
• Fast nationwide delivery
• Genuine TruDesign NZ-made products
• Ideal for NZ boating conditions

Pro Tip 

For a complete system:

• Pair with a TruDesign tank monitor display panel
• Install near the top of the tank for “full” alerts
• Reverse the float if you want a “low level” warning instead