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Contents

DFM fuel flow meters. Operation manual. Version 6.4

Contents

Revision history ......................................................................................................... 4

Terms and Definitions ................................................................................................ 5

Introduction .............................................................................................................. 7

1 DFM general information and technical specifications ................................................. 10

1.1 Purpose of use and application area .................................................................. 10

1.2 Exterior view and delivery set ........................................................................... 13

1.3 DFM modifications ........................................................................................... 14

1.3.1 Autonomous fuel flow meters with display .................................................... 14

1.3.2 Fuel flow meters with display and interface cable .......................................... 15

1.3.3 Fuel flow meters with interface cable ........................................................... 16

1.3.4 Differential fuel flow meters with interface cable ........................................... 17

1.3.5 Differential autonomous fuel flow meters with display .................................... 18

1.4 Measurement range and accuracy ..................................................................... 19

1.5 Unit structure and operation principle ................................................................ 20

1.6 Technical specifications .................................................................................... 22

1.6.1 Working fluids ........................................................................................... 22

1.6.2 Main specifications .................................................................................... 23

1.6.3 Specifications of measuring chambers .......................................................... 25

1.6.4 Power supply modes .................................................................................. 26

1.6.5 Operation modes ....................................................................................... 27

1.6.6 Displayed data .......................................................................................... 28

1.6.7 DFM protection from tampering and intervention ........................................... 31

1.6.8 DFM pulse output signal specifications ......................................................... 32

1.6.9 RS-232 and RS-485 output interfaces specifications and protocol .................... 33

1.6.10 CAN output interface specifications and protocol .......................................... 34

1.7 DFM and tracking devices compatibility .............................................................. 36

1.8 DFM selection ................................................................................................. 37

1.8.1 Selection depending on engine power (boiler output capacity) ........................ 37

1.8.2 Selection depending on fuel flow rate in supply and return lines of the engine .. 38

2 DFM installation .................................................................................................... 39

2.1 Exterior inspection prior to works start .............................................................. 39

2.2 Estimation of vehicle condition .......................................................................... 40

2.3 General installation instructions ........................................................................ 41

2.4 Fuel flow meters mounting schemes .................................................................. 43

2.4.1 Typical diesel engine fuel system scheme ..................................................... 43

2.4.2 DFM installation before the pump ................................................................ 44

2.4.3 DFM installation after the pump .................................................................. 46