STR1 – Radar Tank Level Sender – Analog

One sensor. Every tank.

The new STR1 and STR2 radar tank level senders measure liquid tanks from 150 to 2000 mm — without ever touching the liquid. Auto tank-height detection, configured via the Simarine Connect app, and designed and manufactured in Slovenia, EU.

The end of float arms, foam confusion & probe drift.

Floats stick. Capacitive probes drift. Ultrasonic gets fooled by foam. The STR series is a micro-radar tank level sender — finally a precise, reliable and affordable solution for boats and vans.

Non-contact radar through the lid

Mount it on the outside of the tank lid — the radar reads through the plastic. No probes, no float arms, no contact with fuel, water or waste.

Auto Tank Height Detection

Records distance automatically — no empty/full ritual (needs a little liquid in the tank).

Bluetooth setup & updates

Fine-tune and push firmware updates straight from your phone via the Simarine Connect app.

Any liquid, one part

Fuel · fresh water · grey water · waste water. One sensor across every tank.

Plug & integrate

No need to remove the old sender — just disconnect its wiring and connect the STR to your existing gauge. STR1 for analogue gauges; STR2 speaks NMEA 2000 natively (certification pending).

Watch the STR radar tank level sender at work.

A short walkthrough — how the radar reads through the tank top, the app setup, and a real install from start to finish.

STR1 Features

• Resistance output 0–190 Ω
• Resistance output 240–33 Ω (EU standard)
• Voltage output 0–5 V
• Bluetooth setup & firmware updates via Simarine Connect app
• Drop-in replacement for any legacy tank gauge
• 3-year warranty included 

Not compatible with Simarine PICO. The PICO works with STR1 only. STR2 is NMEA 2000 — monitor it on any compatible MFD or chartplotter; a PICO with the Simarine NMEA module will not read STR2.

Fits any plastic tank.

• Metal tanks? Use the S5 metal tank adapter.
• Three steps. No drilling into your tank, no calibration ritual, no guesswork.
• Mount on the tank lid
• Externally, no contact with the liquid. S5 metal tank adapter available.
• Wire it up

STR1 to your existing gauge inputs. STR2 to the NMEA 2000 backbone.

Open the Simarine Connect app

Pair via Bluetooth, confirm calibration, and start monitoring.

Set it up from your phone.

Pair over Bluetooth, calibrate to your exact tank, and keep the sender up to date — all from the free Simarine Connect app for iOS and Android.

Pair in seconds

Turn on Bluetooth, scan, and tap your sender. Set the name, tank height, units and volume to finish setup.

Auto tank-height detection

Let the sender read the tank height automatically, or enter it by hand — whichever you prefer.

Calibrate any tank shape

Add up to 100 calibration points to match the reading to real volume — ideal for irregular tanks.

Updates over Bluetooth

Push firmware updates straight from your phone, plus backup, restore and full device management.

SPECIFICATIONS

MEASUREMENT

• Principle: High-precision micro-radar (non-contact)
• Supported Tank Height: 150 – 2000 mm
• Resolution: ≈ 7 mm
• Dead zone: ≈ 40 mm from radar face
• Update rate: 1 Hz

TANKS & LIQUIDS

• Liquids: Fresh water · Grey water · Waste water · Fuel
• Tank material: Composite / GRP — metal via S5 metal tank adapter
• Maximum wall thickness: 10 mm

OUTPUTS TO YOUR GAUGE OR DISPLAY

• Analogue outputs: 0–190 Ω · 240–33 Ω · 0–5 Vall three available simultaneously
• NMEA 2000: n/a
• Bluetooth App (setup & monitoring): Simarine Connect app
• Firmware updates: Over Bluetooth — Simarine Connect app
• Simarine Pico: Yes

ELECTRICAL

• Supply voltage: 8–35 V DC
• Current draw: ≈ 14 – 20 mA @ 12 V

PHYSICAL & ORIGIN

• Profile: Low-profile — ≈ 32.5 mm tall
• Mounting: Top-mount, peel-and-stick (external)
• Ingress protection: IP67 — splash-proof
• Warranty: 3-year warranty
• Made in: Slovenia

To download the files simply click on the desired files to select and then click the Download button at the bottom .

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