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Fuel Monitoring in Telematics Guru - Advanced Analogue Mappings

Telematics Guru can support some basic fuel monitoring functionality.

It should be noted that the overall reliability and usefulness of the data ultimately relies on the ability of any connected fuel sensor to provide accurate readings. 

Fuel in tanks sloshes about - and some sensors report readings regularly, without smoothing, which end up being all over the place and unreliable. 

Getting Fuel Data

Various sensors can be used to read and report fuel data, with DM devices and others, see:

Any given fuel sensor will read the sensor and report a "raw" value in it's Analogue Data field. 

To convert this into a useable/human readable number, we set up an analogue mapping - defaults are shown below.

Advanced Analogue Mappings

These are linear, i.e. for battery voltage, the devices report the value in terms of mV - so 4000 is reported, and we can convert to 4.0V in the display via the mapping above. 

Not all sensors operate in this way (though many do). For example, some fuel level sensors will measure the fuel depth in a tank. Some tanks may be narrower/wider in certain sections looking top to bottom. So to convert a sensor reading to a %, we need a non-linear analogue mappings. 

Advanced Analogue Mappings provides the ability to configure this. This can be used for any nonlinear analogues to provide a better estimate. This is not a requirement for all fuel sensing applications.


1. Create Advanced Analogue Mapping

  • Give the mapping a name
  • Select an asset type (all or a specific asset type)
  • Set the Min/Max X and Y values, showing the range.
    • X is the Sensor Reading (i.e. 200 = 200mV read by analogue sensor)
    • Y is the desired displayed value, i.e. 20% full. 

So for a tank level sensor which reads 1V when empty, and 5V when full, 

  • Min X = 1 (V)
  • Min Y = 0% (empty tank)
  • Max X = 5 (V)
  • Max Y = 100% (full tank)

2. Add the mapping values

You can then add various mapping values via the table provided or CSV. 

Some probe/tank manufacturers may provide this data. Otherwise, it can be calculated by taking readings at various tank levels and inputting.

3. Apply Mapping

When creating or editing an asset, add a new mapping

On the Create Screen, choose the "Advanced" option and select your previously created mapping.

When viewing your live or historic data, the advanced analogue mapping with be visible, if enabled above. 


Several reports can be used. 

  • Asset Analogue Value Report
    • This report will provide the current 'snapshot' of device analogue values. i.e. What is the current tank level across the fleet (or anything that is reported in the analogues)
  • Trip List (Diff) Report
    • This report can be customised to include the difference between Analogue Values (i.e. fuel level) at the start and end of trip.
    • This provides the fuel burn for the Trip.

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