Murphy CNG-92200H - Manual (Page 5)

LEVEL III is a comprehensive system
designed to monitor and control the
entire fueling system. It is available
for both simplex or duplex electric
motor or engine driven systems.
The Murphy SELECTRONIC
® Micro-
Controller™ sequentially controls the
compressor operations. It also controls
the priority valves to maintain
adequate storage pressure and the
sequential valves which ensure
maximum fill in minimum time.
A built-in temperature compensator
assures optimum fills.
Remote communication is
possible through the
optional modem.
The LEVEL III is
extremely flexible,
user friendly and
can be expanded to cover a wide
range of CNG fueling facilities.
The LEVEL III control system is rated
for hazardous and non-hazardous
locations.
Features:
PLC capabilities:
120 VAC control circuit for customer
supplied motor contactor
Available for areas rated NEC Class
I, Division 1 or Division 2, Group
D, and non-hazardous locations
Automatic start/stop control for
electric motors or engine drivers
Monitor 40 optically isolated
discrete inputs
Provides 32 open collector outputs
• Operating parameters
adjustable via three button
operator key pad–no
programming needed
• Built-in security to prevent
unauthorized system
parameter manipulation
• Operating parameters stored in
EEPROM–memory maintained
during power outage
Monitor 20 analog inputs
Reliable microprocessor based
control circuitry
Built-in, two-line alphanumeric
display
Operates load/unload devices
Includes hourmeter
Control of Priority and
Sequential Valves
Tachometer on engine
drive units
Expandable to interface with
multiple compressors, pumps,
vaporizers, or multiple station
controls
RS485 and RS232
communication ports
Optional modem
Temperature compensation
24 VDC or 120 VAC
power required
NEMA 3 enclosure
LEVEL III
4
Monitor and control the entire fueling system
including the Priority/Sequential valve operations.
Communications modem on-board.
LEVEL III Duplex
LEVEL III Simplex