12.
Hydr
aulic
s
Hydraulics
Component
Function
Diesel and Biodiesel gauges
These show the pressure of the supply pumps. Ensure the
biodiesel gauge is always 2 psi higher than the diesel
gauge.
COM 50, 125, 250 meters
Measure the flow of biodiesel and diesel.
Biodiesel and Diesel filters
Fuel is passed through these before being dispensed.
Solenoids
Provide on/off flow control for both diesel and biodiesel.
Typical Cycle
The following table describes a typical hydraulic cycle.
Operator Action
What happens at the dispenser
Lift the nozzle
The C4000 activates the pumps. The solenoids open and
the fill commences.
Nozzle lever opened.
Diesel is continuously dispensed, and the biodiesel
solenoid pulses on and off to ensure the correct blend
ratio is delivered. Fuel flow is metered.
After 10 litres is dispensed, the blend ratio is checked,
and then continuously monitored. If an incorrect ratio is
being dispensed an error will occur.
Nozzle lever closed and nozzle
is hung up.
The solenoids close and the pumps stop after the fill has
ended.
