STAR-tank Phased Coherent Radar Tank level Sensor Battery Operated Victron Cerbo Compatible

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Specifications

This battery powered sensor:

• Bluetooth Connection to Victron GX models ONLY
• Battery Life 3-5 years (longer range and lower level tank, battery life 3 years. Shorter range and tank level typically 50% then 5 year)
• Battery 2744
• Bluetooth 5.3 Adv Output ONLY
• Deadband 3cm
• Max Depth 200cm. Can be configured to 0-50cm; 50cm to 100cm; 100cm to 200cm.
• Press button on top and reporting changes to 10 sec intervals for 10mins (during commissioning)
• After 10 mins at 10 sec reporting, interval changes to 60 second intervals

Mounting

The base of the Sensor has 2 sets of holes:

• SAE 5 bolt hole

For Plastic Tanks:

• Glue Sensor to top of tank. The SAE bolt holes form the basis for the bonding.

Cable Length:

• No Cable. It is Battery powered and Bluetooth

Connections:

• No Connections

Simple Calibrations:

• Calibration needed from Display

ETSI

Safiery declares that this sensor is compliant with the European commission radio equipment directive 2014/53/EU article 3.1 and 3.2.

Resistance Slider	Pressure Level	Ultrasonic	Radar
Passive measurement of resistance as a magnetic ring slides up and down a hollow shaft with resistors embedded internally.	Active measurement of pressure in a tank using a silicon wafer that “bends” under pressure and creates a signal. Resultant signal may be voltage, NMEA, CAN or or Bluetooth data.	Active measurement of distance from under a tank (or above tank for Some) to the air-water interface point. Resultant signal may be voltage, NMEA, CAN or or Bluetooth data.	Active measurement of distance from top of tank to air-liquid interface point. Resultant signal may be voltage, NMEA, CAN or or Bluetooth data.
Above Tank with height access to remove the unit of similar height of tank.	Side of tank as close to bottom as possible. Needs a threaded boss on tank to screw into.	Below tank must use a couplant of grease or glue. Cant have intermediate layer.	Above tank for non-metal tanks can sit directly on top of tank (glue) and for metal tanks, needs hole with SAE 5 bolt pattern.
20-30mm Accuracy	Varies with quality but typically 20mm	Varies with quality but generally average	High accuracy of 1mm is achievable.
No active power. Just 2 wire to resistance sensor.	3 wire of power and voltage value and ground.	3 wire of power and voltage value and ground or battery Bluetooth.	Battery operate Bluetooth or CAN/NMEA powered 12/24V.
N/A	N/a	3-5 years battery life	5 years Battery Life Enhanced by AI
Stainless steel components	Stainless steel components	Plastic and embedded sensor	Billet machined Aluminium and embedded liquid proof radar sensor.
Not Suitable for Black water and troublesome in grey water measurement	Not Suitable for Black water and troublesome in grey water measurement	Not Suitable for Black water and troublesome in grey water measurement	Perfect for black water, grey water even with foam on top.

Comparison of Ultrasonic and radar tank Sensors to STAR-Tank

	Mopeka	Gobus C	STAR-Tank
Technology	Sonar (ultrasonic)	Radar	Radar
Placement	Below tank Flat 12mm	Above tank 65mm required	Above tank 30mm required
Accuracy	Affected by foam and temperature	High	High
Power	Battery	12/24V	Battery
Calculated Battery Life	3-5 years	N/A	5 years Enhanced by AI
Warranty	1 year	Not Listed	5 years excluding battery for above non-metallic tanks. 1 year for application in metal tank with SAE 5 bolt hole.
Victron Integration	Bluetooth ADV	Resistance	Bluetooth ADV
Price Point in Euros	Euro 65	Euro 350	Euro 165
Available Now	Available Now	Available Now	Available Now

Pic Shows: Safiery STAR-Tank Radar Sensor with Long Range Bluetooth Battery Operated in position on a Cassette Toilet Canister

This Cassette Toilet by Dometic has a recess under the handle that can accomodate STAR-Tank.

STAR-tank is a radar tank level sensor and operates directly through plastic, ABS, polycarbonate and other similar materials. STAR-tank can read the height even if uneven with solids and give a reliable reading. In the victron Cerbo GX, Tank alarms can be set. Simply glue (optional supply) the aluminium base collar onto the plastic. The Sensor and top of the housing screws into the base collar. Then when emptying the tank, STAR-tank will just sit in place. Pic Shows: Safiery STAR-Tank Radar Sensor with Long Range Bluetooth Battery Operated in position on a Cassette Toilet Canister

This Composting Toilet by Nature's Head has a supporting structure internally that can accomodate STAR-Tank.

STAR-tank is a radar tank level sensor and operates directly through roto-molded plastics, other plastic, ABS, polycarbonate and other similar materials. STAR-tank can read the height even if uneven with solids and give a reasonable reading. In the Victron Cerbo GX, Tank alarms can be set. Simply bolt the aluminium base collar to the structure. (can not glue reliably to roto-molded plastics) and the stainless steel bolts are an optional supply.  onto the plastic. The Sensor and top of the housing screws into the base collar. Then when emptying the tank, STAR-tank will just sit in place.

Disadvantage of Ultrasonic or Sonar Sensors

Non invasive tank level sensors have been limited to Ultrasonic up til now. Ultrasonic sensors operate at around 100kHz. If under the tank, the signal may be blocked by solids or material in the water. If above the tank, they are susceptible to foam and general interference from reflection. They are just not suitable for Black Water or Grey Water. and suffer from reflective errors. They have limited accuracy.

Radar technology is now Affordable

Phased Coherent radar operates at 60GHz and penetrates foam with great accuracy. Up until now, Radar has been an expensive choice and used in very high value applications. But the introduction of Phased Coherent Radar to EV's opened the door for inexpensive tank sensor applications. In pulsed coherent radar, a series of short-duration radio frequency pulses are transmitted towards the water line from above. These pulses are reflected back and received by the radar system's antenna. The received signals are then processed and analyzed to determine the depth. The term "coherent" refers to the radar system's ability to maintain a constant phase relationship between the transmitted and received signals. This coherence allows for more accurate measurements and improved signal processing techniques, such as coherent integration, which enhances the radar's sensitivity and range resolution. Pulsed coherent radar systems are commonly used in various applications, including military surveillance, air traffic control, weather monitoring, and automotive radar systems. They offer advantages such as high accuracy, long-range capabilities, and the ability to distinguish multiple targets in close proximity. https://www.youtube.com/embed/koQWxb1gkbY?controls=0&rel=0&playsinline=1&cc_load_policy=0&enablejsapi=1&origin=https%3A%2F%2Fsafiery.com&widgetid=2

Video Showing Phased Coherent Radar raw signal and corresponding tank level as sensor is moved above water.

This is the most advanced software development we have developed as there are 3 independent IC's. fresh libraries had to be created.

STAR-Tank Spec Sheet