Settings to read the Eurosens Degree BT sensor

For measurement we need at least a pair of devices : sensor (transmitter) and receiver.

Sensor doesn't have any wires and is powered from long-life onboard battery during several years.

One receiver can poll up to 10 sensors and sends results to the GPS trackers via RS485 interface using LLS protocol.

Each sensor supports up to 3 calibration tables  - when we have 3 axles supporting one air spring it is an advantage.
Each axle load value can be assigned with PGN.

https://youtu.be/azj5Zogh9Hk

Calibration tables are stored onboard in that case.
You may ask - how to calibrate sensors only, when we have several axle load sensors connected to GPS tracker.

And we already have some data coming to server, like ain1, ain2 data from sensors.

As usual, we have to get vehicle on truck scales.

Eurosens Difference system supports various configurations of lifting axles, pneumatic suspension schemes and trailers.
You must choose the configuration in configurator

■ Individual axle load measurement for truck and trailer.
■ Cargo load calculation.
■ Axle overload alarm.
■ Show axle load and cargo weight at the driver’s display.
■ Transmit axle load and cargo weight values to the GPS tracking system.

Eurosens Difference system consist from several parts:

1. Sensors

Air spring suspension – Eurosens Difference 01
Leaf spring suspension – Eurosens Difference 02

Also you can use any sensors with analog (voltage) output : vehicle sensors, strain gauges, load cells, pressure sensors, etc.

2. Electronic unit Eurosens Difference-T

■ Process voltage signal from one load sensor.
■ Stores the parameters (dimensions and weight) of truck or trailer (where its installed).
■ Stores the calibration data.
■ Transmits sensor signal to the digital message in RS485 interface with its address.

3. Eurosens Display RS

■ Receives information about axle loads from the Difference-T controllers.
■ Determines the weight of the cargo based on the mass-dimensions of the tractor or semitrailer truck.
■ Displaying of the axle load and weight of the cargo on the special indicator in the driver’s cab.
■ Warning of exceeding the permissible load on one of the axles.
■ Output to RS485 interface of cargo weight.

Eurosens Difference 02 in fact is resistive position sensor and is designed to provide information on the distance between the body and the axis of the vehicle. Measured value is proportional to axle load of vehicle.

Rated supply voltage Us = 24 V.  Output sensor voltage at the control points depending on the lever angle specified in Table 1.

Lever angle, degrees                         Output voltage, V
0                                                              1,54
10                                                            1,78
20                                                            2,02
30                                                            2,26
40                                                            2,50
50                                                            2,74
60                                                            2,98
70                                                            3,22
80                                                            3,46

It is important to observe when installing the sensor permissible angles of its lever movement.

Pneumatic axle load sensor is designed to measure the current axle load of a vehicle with air suspension. The sensor can be connected to any AVL unit with an analog (voltage) input.

Parameters    

- type of output                             voltage, V
- supply voltage, V                        8-32
-Input pressure, MPa                 0-0,8
Thread                                     М16 х 1 ,5
Weight, kg                                  0,15
    
Precision    
Max error of pressure value measurement          2.5%

Operation conditions    
Ambient temperature range,°С    from -40 to +80

Output of sensor:

Power supply voltage, V                      Pressure, KPa              Output voltage, V (±115 mV)
24,5±0,5                                                   0                                         0,205
                                                                100                                       0,635
                                                                200                                       1,087
                                                                300                                       1,542
                                                                400                                        1,99
                                                                500                                        2,432
                                                                600                                        2,910
                                                                700                                        3,367
                                                                800                                        3,817