Precision Tank Level Monitoring Without Touching the Liquid

The Simarine STR1 Radar Tank Level Sender is a revolutionary non contact liquid level sensor that accurately measures the contents of your tank using advanced micro radar technology. Mounted externally on the top of a plastic tank, the STR1 reads the liquid level through the tank lid without any probes, float arms or components coming into contact with the contents.

Ideal for campervans, motorhomes, boats and off grid vehicles, the STR1 provides reliable and maintenance free level monitoring for fresh water, grey water, waste water and fuel tanks.

Non Contact Radar Technology

Unlike traditional float or capacitive sensors, the STR1 uses high precision radar to measure the distance to the liquid surface.

This means:

• No moving parts
• No sensor inside the tank
• No contamination of liquids
• No mechanical wear
• Consistent, accurate readings over time

The sensor supports tank heights from 150 mm to 2000 mm, making it suitable for everything from compact campervan tanks to large water storage systems. Simarine

Universal Analogue Outputs

The STR1 has been designed as a universal replacement for traditional tank senders and outputs all of the following signals simultaneously:

• 0 to 190 Ω resistance
• 240 to 33 Ω resistance
• 0 to 5V analogue output

This allows it to integrate with a wide range of existing gauges and monitoring systems without requiring additional converters. Simarine

Bluetooth Configuration

Using the free Simarine Connect app, setup is quick and straightforward.

Features include:

• Bluetooth pairing
• Automatic tank height detection
• Tank calibration for irregular shaped tanks
• Firmware updates
• Device management

The app allows up to 100 calibration points, providing exceptionally accurate volume readings even on non standard tank shapes. Simarine

Suitable For

The STR1 can monitor:

• Fresh water
• Grey water
• Waste water
• Diesel
• Petrol

For plastic tanks, the sender mounts directly to the tank lid using the supplied adhesive fixing.

For metal tanks, the optional Simarine S5 Waveguide Adapter is required to allow the radar signal to pass into the tank. Simarine

Key Features

• High precision non contact micro radar technology
• Measures through plastic tank lids
• Zero moving parts for long term reliability
• Bluetooth setup and configuration
• Automatic tank height detection
• Simultaneous analogue outputs
• Supports irregular tank calibration
• IP67 rated housing
• Low profile design
• Designed and manufactured in Slovenia

Technical Specifications

• Measurement Principle: Non contact micro radar
• Supported Tank Height: 150 mm to 2000 mm
• Resolution: Approximately 7 mm
• Dead Zone: Approximately 40 mm
• Supply Voltage: 8 to 35V DC
• Current Consumption: Approximately 14 to 20 mA at 12V
• Outputs:
  • 0 to 190 Ω
  • 240 to 33 Ω
  • 0 to 5V
• Bluetooth Connectivity
• IP67 Protection Rating
• Operating Temperature: Suitable for harsh automotive and marine environments
• Compatible with Simarine Connect App
• Warranty: 3 Years Simarine

Perfect For

• Campervans
• Motorhomes
• Boats
• Marine applications
• Off grid vehicles
• Water tanks
• Fuel tanks
• Grey water systems
• Waste water tanks

The Simarine STR1 offers a modern, maintenance free alternative to conventional float sensors, delivering precise and dependable tank level monitoring with a simple, non invasive installation.