STAR-Tank User Manual

Safiery STAR-Tank Radar Bluetooth Sensors STAR-Tank sensor support is added to Venus OS. These radar tank level sensors use Bluetooth Low Energy. This wireless technology allows devices to be networked within a range of about 40 meters (with Bluetooth Adapter added to Cerbo GX, see below), while consuming significantly less power than ordinary Bluetooth technology. The expected battery life is 5 years with tank measurement averaging 50%. Battery life is less at around 3 years if tanks average 10% level for example. The liquid level, temperature and sensor battery voltage are streamed wirelessly to the GX device. STAR-Tank sensors feature phased coherent radar sensing for non-pressurized tanks. The tank level range is 2m as standard. This can be extended, consult Safiery. The top 30mm from the base of the sensor is a dead band. If the tank is 12mm thick fiberglass, then the deadband is 18mm below the top of the tank. The sensors are attached directly on top of any non-metal tank including thick fibreglass tanks. For metal tanks, the sensor needs a clear view of the liquid. To achieve that, a 5 hole SAE pattern adapter is included into the base. To achieve an air tight seal, use “gas sealing tape” (generally pink) and wrap on the thread and screw into the base plate. This prevents gas from the tank passing through STAR-Tank. For non-metal tanks, adhere the base plate. Then, screw the STAR-Tank module onto the base. STAR-Tank suits black water tanks, even with foam above the liquid line.

STAR-Tank has several machine learning functions for caibration using AI.

1. There are hundreds of reflected radar signals from the bottom and side of the tank. Our program selects the dominant value during the first 10 seconds of “setup” mode. It then retains the profile for your tank at the tank depth selected. Every time a different tank depth is selected using the setup mode, a different filtering profile is stored in memory. 2. The shape of these reflected signals changes with tank depth. By going through the setup process and nominating the tank depth changes the way we filter the reflected signals and select a dominant value. 3. The “Setup Mode” process described on the next page combines 1 and 2 above into a single process.

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