Votronic Tank Electrode 30-110 K-FL - 5551

Votronic Tank Electrode 30-110 K-FL: Capacitive Level Sensing for Tall Tanks

Precision Fluid Monitoring for Caravans, Motorhomes, and Marine Systems

The Votronic Tank Electrode 30-110 K-FL is a next-generation capacitive level sensor engineered for reliable, maintenance-free monitoring of fresh water, waste water, and grey water in tall tanks. Designed as the successor to the proven Tank Electrode FL, this model introduces enhanced flexibility and simplified top-down installation, making it an ideal choice for caravan water tanks, motorhome holding tanks, and marine fluid systems where access is limited to the tank roof.

Unlike traditional float switches or resistive probes that can suffer from mechanical wear or corrosion, the K-FL employs a capacitive measuring principle that operates without moving parts. This solid-state design ensures consistent accuracy across a wide range of tank materials, including plastic water tanks and metal tanks such as aluminium, steel, and stainless steel. The result is a durable, long-life sensor that reduces the risk of false readings and unexpected tank overflows or dry runs.

Adaptable Installation for Tanks from 30 to 110 cm

One of the standout features of the Tank Electrode 30-110 K-FL is its flexible cable probe, which can be easily shortened to match the exact height of your tank. This customisation ensures optimal sensing performance without excess cable coiling inside the tank, which could lead to measurement errors or snagging. The probe is suitable for tanks with heights between 30 and 110 cm, covering the majority of RV fresh water tanks, boat waste tanks, and off-grid grey water storage.

Installation is straightforward: a single 38 mm (approx. 1.5 inch) bore hole is required on the tank top, and the electrode can be mounted from either the outside or inside of the tank. The included mounting hardware, featuring a PG 29 thread and a 46.5 mm flange, provides a secure, watertight seal. An external counter electrode (Com cable) runs down the outside of the tank, completing the capacitive circuit without the need for additional tank penetrations.

Key Features at a Glance

• Capacitive measurement technology for reliable, non-contact level sensing in plastic and metal tanks
• Adjustable probe length from 30 to 110 cm, customisable on-site for a perfect fit
• Top-mount design with 38 mm bore hole, ideal for tall tanks with limited side access
• Compatible with fresh, waste, and grey water, including faecal tanks
• Wide operating voltage range (7–32 V DC) for 12 V and 24 V battery systems
• Low current draw (4–7 mA) to minimise battery drain in off-grid setups
• 0–2.2 V analogue signal output for seamless integration with Votronic displays and third-party controllers
• Corrosion-resistant construction suitable for harsh marine and mobile environments

Seamless Integration with Votronic Monitoring Systems

The Tank Electrode 30-110 K-FL is designed to work flawlessly with a wide range of Votronic display units, including the Fresh Water Tank Indicator S, Waste Water Tank Display S, Info Panel Pro, VPC Jupiter, VPC Terra, and the VBS 2 BUS-System. It is also backward compatible with Votronic tank displays manufactured since 1987, ensuring a straightforward upgrade path for existing installations. The sensor outputs a linear 0–2.2 V signal proportional to the tank level (0–100%), allowing precise monitoring and control.

For those building custom monitoring solutions, the analogue output can be interfaced with programmable logic controllers (PLCs) or microcontroller-based systems, offering flexibility beyond standard RV applications. This makes the K-FL a versatile choice for remote water storage monitoring, agricultural tanks, and industrial fluid management where reliable level data is critical.

Built for the Demands of Mobile and Off-Grid Life

Life on the road or at sea demands equipment that can withstand vibration, temperature swings, and exposure to moisture. The Votronic Tank Electrode 30-110 K-FL is engineered with these challenges in mind. Its robust cable probe and sealed mounting assembly resist the effects of sloshing liquids and constant movement, while the capacitive sensing method is inherently immune to fouling from waste or grey water residues—a common failure point for mechanical float switches.

By choosing a capacitive sensor over traditional resistive probes, you eliminate the risk of electrolysis-induced corrosion that can plague metal tank installations. This is particularly important in aluminium boat tanks and steel RV chassis tanks, where galvanic reactions can compromise both the sensor and the tank itself. The K-FL’s non-invasive sensing approach ensures long-term reliability without sacrificing accuracy.

Simple Setup, Lasting Performance

Installation is a one-person job with basic tools. After drilling the 38 mm hole, the probe is inserted, cut to length, and secured with the provided nut and sealing washer. The external Com cable is attached to the tank exterior using the included Com bolt, establishing the capacitive reference. No calibration is required—the sensor automatically adapts to the tank height once trimmed. This plug-and-play simplicity reduces installation time and the potential for errors, getting your monitoring system up and running quickly.

For tanks with internal obstructions or irregular shapes, the flexible cable probe can be routed to avoid baffles and fittings, ensuring consistent measurement even in complex tank geometries. This adaptability sets the K-FL apart from rigid rod sensors that demand a straight, unobstructed path.

Upgrade Your Tank Monitoring Today

Whether you're retrofitting an ageing level sensor or building a new water system from scratch, the Votronic Tank Electrode 30-110 K-FL delivers the accuracy, durability, and ease of installation that professionals and DIY enthusiasts trust. Equip your caravan, motorhome, or boat with a sensor that keeps you informed about your most critical resource—water. Order the Votronic Tank Electrode 30-110 K-FL now and gain peace of mind on every journey.