Type / N°
Rev.
Fw
Date
Page
Total pages
EW055.600D
D
4L
6
th
June 2018
7
43
EsiWelma
®
s.r.l.
The refuelling operation begins by turning the switch to START
If the dispenser is available and nozzle is connected to the refuelling receptacle on the
vehicle, it’s possible to actuate the “START” switch, activating the delivering sequence of the
computing head, which will perform the following controls:
The same as described above
- see §2.2
PULSER
- in case of a pulse measuring device, the presence of
pulses is verified in time compliance.
TOTAL COUNTER
- verifies the presence of the electromechanical total
counter
HF
- verifies that the compressed natural gas flow does
not exceed the set value, so that in case of a gas
loss due to the cut of a nozzle connected to the
vehicle, flow can be immediately stopped.
If the above mentioned checks give a positive result, the refuelling procedure can start with a
visual control by display and a subsequent activation of the solenoid valves.
Display
- All digits show 8, then blank and at last 0.00 Euro
and 0.00 kg. Each phase takes about 1 second: in
this way user can verify immediately the good
working of each step.
Figure 3:
Refuelling start sequence; CNG metric counting version
During the refuelling process the computing head executes the following functions:
Activation of the command modules of the following devices: solenoid valves and
operating lights.
As defined during the set-up:
Pulse acquisition coming from the transducer
Every pulse is equivalent to 10g.
Acquisition of the delivered quantity through
communication with the mass flow meter.
Calculation and visualization of the delivered quantity and the relevant amount.
Control of the validity of the visualized data (implicit with the control of Ram and Eprom).
Functional control of the single or both displays.
Presence control of the electro mechanical total counter and managing of both electro
mechanical and/or electronic total counter.
p.u.
Kg
p.u.
Kg
p.u.
Kg
p.u.
Kg
