FMB640 Accessories

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Bw nb.png Please order accessories separately as they are not included into device package.


Accessory and its description Accessory connection schematic
Fuel tank sensors Fuel sensor connection to FMB640
A fuel tank level sensor which indicates the approximate fuel level on the driver's indicator panel exists in most cars. If the sensor returns analogue signal proportional to fuel level it can be connected to FMB640 Analog input. After connection to the tank fuel level sensor a calibration is needed because most fuel tank sensors are not linear. Calibration is performed by measuring voltage values resulting from the volume of fuel in tank.
FMB640 Fuel Sensor.png
Alarm buttons, door sensors etc. Panic button connection to FMB640
Alarm buttons, door sensors, ignition, etc. have two output states: high or low. FMB640 Digital inputs are used to detect these states.
FMB640 Panic button.png
Relays Inverting relay connection to FMB640
In cases when sensor output signal is negative, an additional relay has to be installed to convert negative signal to positive.
FMB640 inv relay.png
Immobilizer relay Immobilizer relay connection to FMB640 output
When connected as shown on the right hand side, FMB640 disables engine starter when output is ON.
Sch fmb1yx imb relay.png
Automotive relay Automotive relay pinout
An ordinary automotive relay is used to invert input signal or to immobilize engine starter. Note that relays can be 12 V or 24 V capable.
Pic relay.png
Sch ord relay.png
1-Wire devices Digital thermometer DS1820 and TTJ100 connection to FMB640
One of the implemented features on FMB640 is 1-Wire® data protocol, which enables connection to devices such as thermometer (DS1820, DS18S20 and DS18B20) and I-Button DS1990A.
FMB640 DS1820.png
TTJ sensor pinout
FMB640 TTJ.png
I-Button DS1990A connection to FMB640
FMB640 DS1990A.png
Impulse counters Pulse fuel meters connection scheme
Here two pulse meters are used, where one is mounted on the direct flow valve and the other on the return flow valve. Data from both meters is sent to the FMB640. Then FMB640 calculates DIN3-DIN4. Resulting difference equals to fuel consumption. Filter should be used on the direct flow pipe to prevent any damage caused by impurities in the liquid. The filter mounted in the meter inlet is only a safety filter and it is too small to act as a strainer.
FMB640 Impulse meter.png