We have two ways of dealing with fuel problems.
The digital way
The analog way
1 - Digital control
For digital control we have several ways to proceed. We can use LLS (liquid level sensor) SENSOR, an ALL-CAN300 (specific for machines) to the FMB.
LLS (liquid level sensor) SENSOR
LLS sensor series liquid level sensors are solid-state capacitive devices with no moving parts. The sensors use capacitive technology to produce accurate liquid level measurements of standard factory grade DIESEL OIL and PURE GASOLINE (BENZINE) carbon fuels. The LLS sensor liquid level sensors are strictly prohibited to use in any liquids which are not the factory grade carbon fuels or contain: BIOFUEL, METHANOL, ETHANOL, UREA and similar aggressive components in pure form or as additives for factory grade carbon fuels for use in INTERNAL COMBUSTION ENGINES. Operating media – Diesel fuel (oil), pure gasoline (benzene).
In order to use LLS fuel counter the newest firmware version is needed which can be obtained from Teltonika or a representative. Firmware is updated over GPRS or using cable update method.
RS-485 receive (LLS) mode:
This mode supports up to five LLS fuel level sensors each of which has a receiver ID.
If you are using an LLS (through RS232 or RS485) calibration of the Fuel Level sensor is done through the Sensor software.
https://wiki.teltonika.lt/view/FMB640_RS-232_and_RS-485
ALL-CAN300 (specific for machines) to the FMB
Communication network can provide a wide range data that can be used to reduce running costs, improve driver safety, streamline maintenance processes and support environmental responsibility.
Features:
Status LED, Ignition indication, Vehicle mileage, Vehicle speed,Total fuel consumption, Fuel level (Dashboard), Acceleration position, Engine temperature, Engine working, Engine lifetime, Alarm, Driver’s seat belt, Passenger’s seat belt, Parking, Airbag status, Check engine warning, Low fuel warning…
https://teltonika.lt/product/all-can300/#features
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2- Analog control
For analog control, a connection between the tank and the analog input of the vehicle tracker must be made followed by a calibration and data insertion taken from the configurator in order to configure the vehicle tracker.
You can connect the analog cable of the device to the analog wire on the fuel level sensor ( not from gauge level ). On the top of the fuel tank you will find the sensor. Most models have 3 wires. One wire is the analog and has a voltage from 3 to 9 v and on some model goes up to 24 volts.
The second wire is for the low level indication that goes to the led of the fuel level gauge.
The third cable is the " +".
Once you connected then you need to calibrate the tank.
You need to go to a petrol station with low level fuel and add 20 liters each time. When you add 20 liters you need to read the analog sensor voltage and record it. example 20L->3.3V, 40L->3.6V, 60L->4V and so on.
Then you feed this info to the server and you can start reading your fuel consumption.
If you are using an Analog Fuel Level sensor, this is how the Calibration is done:
See attached screenshots regarding the calibration (Calibration of Fuel Level Sensor through the Configurator; Analog Fuel Sensor calibration)
Here are three images showing respectively:
Analog Fuel Sensor calibration
Analog Event configuration
Calibration of Fuel Level Sensor through the configurator
NB :
For trucks with several tanks, you need to connect a sensor for each tank and monitor them separately. For this we need a vehicle tracker with two analog inputs (AIN1/AIN2) the FMB 120 is an example.
It is possible to receive the Fuel Level through j1708 or SAE J1939 but you have to use dedicated trackers (FM6300 or FMB640)
For FMB devices (FMB1XY, FMB0XY, FMB9XY, FMB20X except FMB640) it is also possible to use BLE Fuel Level sensors
https://www.fmeter.ru/en/produktsiya/besprovodnoy-datchik-urovnya-topliva/eskort-td-ble/
Events and Operands configuration can be found here: