Wayne GLOBAL VISTA CNG, Инструкция по эксплуатации

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© Copyright
2008-03-20 V0 Rev.01.0
- 7 - WT004139
Main technical characteristics
The main technical characteristics of the GLOBAL VISTA CNG dispensers are listed in the following table:
Maximum flow 77 kg/min
Minimum flow 0,06 kg/min
Minimum measurable quantity 5 kg
Measuring accuracy ± 1%
Maximum working pressure 250 bar
Power supply 230 Vac +15 -25% 50-60 Hz
Storage and working temperatures -20°C ÷ +40°C
Approximate weight (with packaging) Min. 200 kg - Max. 300 kg
The function of the CNG dispenser is to fill compressed natural gas into vehicle tanks. Dresser CNG
dispensers can pump both at high flow and standard flow and can therefore fuel all vehicles using CNG, such
as automobiles, vans, buses and trucks.
Operating principles
The compressed natural gas moves from the storage tank or directly from the compression unit, to the CNG
dispenser, and then reaches the vehicle’s tank, passing through the mass-flow meter in the dispenser.
The information given by the mass-flow meter or any other sensors (temperature sensor, pressure sensor,
etc.) are processed by the electronic head, which carries out specific operations based on the values it
receives.
The CNG dispensers can be:
•
Single-stage dispensers that control a single valve (first stage level); their hydraulic system
communicates with one storage tank only;
•
Multi-level dispensers (cascade system) which control two or three valves (first, second, third
level valves); their hydraulic system communicates with two or three storage tanks with different
pressures.
Electrical system
The electrical system, which allows all of the dispenser’s functions (control, command, lighting, etc.), is in
compliance with the safety regulations and legislations that are relative to the installations in potentially
explosive atmospheres.
Cables and safety switches must be chosen and sized according to applicable EN/CEI norms.
Important!
In order to respect current safety regulations, wiring must be performed exclusively by technicians
who install CNG dispensers