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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.

Tasks

Preventing fuel theft

Fuel consumption monitoring

Engine testing for fuel consumption

Machine running time tracking

CO? emissions monitoring

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 tampering

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

Special

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
Total CO2 Emission
Hourly CO2 Emission

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

DFM installation and connection

Installation portfolio

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.

Specification

Connecting thread	M14x1.5 M16x1.5
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/
Operating temperature, (without/with display), °C	-20..+60
Ingress Protection Rating	IP 54 (IP67*)
Relative accuracy error per chamber, %, not more than	1

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