Fuel flow meter DFM

Fuel flow meter

DFM is designed for fuel consumption measurement in fuel lines of vehicles and stationary machines, also for operating time monitoring in different working modes of engine.

DFM fuel flow meter is used for consumption measurement of the following fluids:

  • diesel fuel
  • heating oil
  • other liquid fuels and mineral oils with kinematic viscosity of 1.5 to 6 mm2/s.

DFM is a tool for direct measurement of fuel consumption, which is used as a part of GPS tracking system, vehicle telematics system or as an stand-alone (autonomous) solution for fuel consumption monitoring.

One-chamber DFM fuel flow meters are mainly intended for small and medium engines with indirect injection fuel system.

Diesel fuel flow meter


Preventing fuel theft
Engine testing for fuel consumption
Machine running time trackingMachine running time tracking

Advantages of DFM

Digital Counters and built-in battery

All data is registered in digital Counters in internal memory of DFM fuel flowmeters. That ensures data safety and protection against tampering and interference by third party. Also, Counters are registering data even if external power supply is switched off. After the power supply is back all data is sent to telematics unit.

Protection against cheating

DFM has two special Counters, which register third party influence attempts on flow meter operation – “Tampering” and “Interference” Counters.

“Interference” Counter protects DFM from magnetic field impact aimed on stopping fuel consumption measurement. “Tampering” Counter registers attempts of third party to tamper flow meter data by generating artificial fuel consumption (e.g. by blowing the air through measuring chamber).

In both situations DFM will start recording duration of influence and will send alarm to a telematics unit.

Fuel consumption and operating time Counters

Fuel consumption

  • Instant fuel consumption, L/H
  • Hourly fuel consumption in “Forward” line
  • Hourly fuel consumption in “Return” line
  • Total fuel consumption, L
  • Total fuel consumption in “Idling” mode of engine operation
  • Total fuel consumption in “Optimal” mode of engine operation
  • Total fuel consumption in “Overload” mode of engine operation
  • Total fuel consumption in “Negative” mode of flow meter operation (return exceeds supply)

Engine operating time

  • Total operating time, h
  • Total operating time in “Idling” engine operation mode
  • Total operating time in “Optimal” engine operation mode
  • Total operating time in “Overload” engine operation mode
  • Total operating time in “Negative” flow meter operation mode
  • Total operating time of Supply chamber
  • Total operating time of Return chamber
  • Operating time of Supply and Return chambers in each mode of engine operation


  • Engine operating time in “Tampering” mode, h
  • Engine operating time in “Interference” mode, h
  • Current engine operation mode as per fuel consumption rate
  • Fuel temperature
  • Temperature correction status
  • Correction coefficient value
  • Battery charge

DFM types

Fuel counter with LCD

Fuel counter (fuel meter) with LCD. Autonomous low-cost solution for fuel consumption measurement.

 DFM fuel flow meter with cable

Fuel flow meter with output (interface) cable for sending signal to tracking unit. Efficient solution for online fuel consumption monitoring within telematics system.

DFM flow meter with cable and LCD display

Output signal cable + in-built LCD display. Combination of autonomous fuel counter and online solution for fuel monitoring within telematics system.

Information on DFM display

DFM with display allow  autonomous fuel consumption measurement without data transfer to a server. This solution is mostly used for small stationary units or for small fleets operating within enclosed area.

DFM display information screens:

Total Fuel Consumption
Total Fuel Consumption counter with higher digit capacity
Engine Operation Time
Engine Operation Time in Idle Mode
Engine Operation Time in Optimal Mode
Engine Operation Time in Overload Mode

Fuel Consumption in Tampering Mode
Interference Time
Instant Fuel Consumption
Battery Charge in Percentage of the Maximum
Temperature in the Measuring Chamber
Firmware Version

Fuel rate displayed by fuel counter

Is it possible to fool DFM?


DFM  is installed directly into the fuel line of the vehicle (between fuel tank end engine) and allows prompt fuel theft detection.  DFM  is reliably protected from cheating and vandalism. Operation of DFM D cannot be influenced without a trace.

  • Strong metal body of DFM ensures reliable protection from dust and dirt, as well as against attempts to disable the flowmeter.
  • Protection from influence of strong magnetic field. In the case of electromagnetic interference, the flow meter records duration of action to special “Interference” time Counter.
  • Tampering with air flow is useless! If fuel consumption rate is higher than usual, DFM registers the tampering time to special “Tampering” counter.
  • High battery life. DFM  fuel flowmeters can operate from the built-in battery for up to three years. When disconnected from on-board power network, DFM  still records data and saves it in its own memory.
  • Sealing of the flowmeter and fuel system elements. Not possible to intervene to places of flow meter installation without damaging the seals.

DFM installation and connection

DFM are installed directly in fuel line of engine:

  • before low-pressure pump – on  “suction side”, or
  • after low-pressure pump – on “pressure side”.

Exact way of installation is chosen depending on fuel system specifications. Installation schemes are described in DFM documentation. For more detailed information, please, read DFM fuel flow meters Operation Manual. For information on DFM operation together with other fuel monitoring products and CANbus tools – please refer to CAN j1939/S6 Telematics interface.

Connecting thread M14x1.5
Nominal pressure, bar 2
MAX pressure, bar 25
Supply voltage, V 10-45
Overvoltage protection, V ≤100
Current consumption, mA (24 V/12 V), mA 25 / 50
Operating temperature, (without/with display), °C -40..+85/
Ingress Protection Rating IP54
Relative accuracy error per chamber, %, not more than 1
Model Nominal bore Start-up flow rate, l/h MIN flow rate, l/h MAX flow rate, l/h Recalibration interval, l
DFM 50 6 0,5 1 50 100 000
DFM 100 6 0,5 2 100 100 000
DFM 250 8 2 5 250 250 000
DFM 500 12 5 10 500 500 000


DFM order identification codes

*         A symbol is not specified for differential fuel flow meters.
**      For autonomous fuel flow meters Z version is not used.
***    This version is delivered upon special order. Designation U is available only for one-chamber flowmeters.

Other products for fuel monitoring and fuel oil measurement

Differential flow meter

flow rate 10-600 l/h

Differential flow meter

Wireless flow meters

flow rate 1-600 l/h

Wireless flow meters

Industrial flow meter

flow rate 0,72-25 m3/h

Industrial flow meter

Flow meter for heavy machinery

flow rate 20-4,000 l/h

Flow meter for heavy machinery

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E-mail: [email protected]

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