Si-Marine STR2 Tank level sender (NMEA2000)
124,00 €
& Free Shipping for orders over €300 — max total weight 3 kg.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).
Availability: In stock (can be backordered)
Quick Install
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,
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.
| 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 | 0.5 Hz (NMEA 2000 bus) | |
| 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 | N/A | |
| NMEA 2000 | Native PGN 127505 — Fluid LevelNMEA 2000 certification pending | |
| Bluetooth App (setup & monitoring) | Simarine Connect app | |
| Firmware updates | Over Bluetooth — Simarine Connect app | |
| Simarine Pico | no | |
| 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 |
|
| Weight | 0,1 kg |
|---|---|
| Dimensions | 6 × 6 × 6 cm |
| VENDOR |
