Type / N°
Rev.
Fw
Date
Page
Total pages
EW055.600D
D
4L
6
th
June 2018
17
43
EsiWelma
®
s.r.l.
3.4. Operating modes
For fitting different field operating modes, the computing head can work in different ways, that
can be subdivided in two principal categories:
1. system adaptation (to implant)
2. dispenser adaptation
3.4.1
System adaptation
The management of the solenoid valves is adaptable to the type of system where the
dispenser is installed:
Single level for the implants that have only one compression system installed
Cascade 2 levels for the implants that have a 2-level compression system installed
Cascade 3 levels for the implants that have a 3-level compression system installed
3.4.2
CNG dispenser adaptation
The management of the solenoid valves is adaptable on the type of dispenser installed:
EV1 active only during the first level phase
EV1 always active until the end of refuelling
High pressure control determinate with a pressure switch
High pressure control determinate with a pressure transmitter
3.5. Types of refuelling
The computing head can be adapted to different national standards, allowing to modify the
way of refuelling as follows:
No control:
–
Free delivery up to the maximum available pressure.
Compensated:
–
It modifies the end of the refuelling in function of the pressure value related to
the ambient temperature (so that at 25°C the pressure can not exceed the
specific value inserted during the set-up by
PCON
parameter).
