FWMurphy
Control Systems for
Alternative Fuel
Fueling Stations
CNG-92200H
Revised 08-00
00-02-0149
F
WMurphy has been in the
business of providing
quality controls to the engine,
pump, and compressor market
since 1939. Most of the controls
in use today were pioneered by
Murphy to meet the needs
expressed by OEM’s, packagers
and users. As we move into a
renewed era of environmentally
clean burning Alternative Fuels,
with Compressed Natural Gas
(CNG) leading the way, Murphy
again is out in front with new
control systems. This fast growing
market requires combining the
best of our proven controls with
the innovative SELECTRONIC
®
Micro-Controller™ units. Murphy
engineers are able to provide well
designed systems to meet your
exacting needs.
Our LEVELS I, II, and III control
systems have been engineered to
cover a wide variety of
requirements from simple
start/stop operation of the
compressor and driver to
complete station automation with
remote communication
capabilities. Should these standard
systems or options not cover your
system requirements, these
controllers have the capability to
be expanded or engineered to
meet your needs.
We understand your
requirements, we listen to your
concerns, and most importantly,
we respond. Murphy controls are
known and accepted world-wide,
and they are backed by our
limited 2 year warranty.
All Murphy controls are
designed to live in the harsh
environment of motors,
engines and compressors.
They’re tough for tough
applications. These systems are
designed and built in accordance
with NFPA 52 and NFPA 37
guidelines to meet the area
classification requirements as
defined by the National
Electric Code.
Whether you are upgrading
existing equipment or specifying a
new installation, give your
equipment the Murphy
Advantage. You will add value to
your equipment and gain
increased customer satisfaction.
Specify Murphy LEVEL I, II, or III
SELECTRONIC
®
control systems
for your Alternative Fuels Fueling
Station control requirements.
Continuing a Tradition
1
We understand your
requirements, we listen to
your concerns, and most
importantly, we respond.
NOTE: The features shown for LEVELS I, II, and III are typical for intended applications. Exact configuration and availability of
features may depend upon final system requirements.
LEVEL I is an entry level controller system
designed for the small fueling facility requiring
only basic start and stop of the compressor
and monitoring basic shutdown functions. It
monitors and controls the electric motor
driven compressor and the system loading and
unloading devices.
The LEVEL I controller is an extremely
powerful system, yet user friendly. Its design
incorporates the high technology Murphy
SELECTRONIC
®
Micro-Controller™ series.
Features:
Automatic start and stop control
Operating parameters field adjustable
without reprogramming
Includes hourmeter
Extremely user friendly
Operates load/unload devices
Compatible with stand alone
priority/sequential controls (see below)
NEMA 4, 7, and 9 enclosure
Standard Control Systems for
CNG Fueling Stations
LEVEL I
2
Designed for the small fueling facility...monitoring
and controlling electric motor driven compressor.
The Murphy SELECTRONIC
®
Priority/Sequential Controller
will monitor the Cascade or
other high pressure storage
banks and control the electric
sequencing valves. The Priority
Valves will sequence at operator
selectable levels to fill the
storage on fast fill packages. It
will also monitor the vehicle
dispenser flow rate and
pressure, and will control the
Sequential Valves and Shut-off
Valves to maximize filling the
vehicle in the minimum amount
of time.
Additional Controls
Stand Alone Priority and
Sequential Controller
LEVEL II is a mid-range system
designed for the larger stations
with more shutdown inputs
being monitored than the LEVEL I
control system. The LEVEL II
system performs all the functions
of the LEVEL I, plus is available
for both single or dual electric
motor or engine drive
applications. A SELECTRONIC
®
Micro-Controller™ monitors
control functions and displays
status and faults in a two line
alphanumeric LCD display. By
selecting the appropriate Murphy
SELECTRONIC
®
Micro-Controller™
for the specified hazardous area
classification (Div. 1 or Div. 2),
non-explosion-proof end devices
can be used. The LEVEL II
controller is housed in a NEMA 3
weatherproof enclosure.
Features:
Automatic start/stop control
for electric motor or engine
driver(s)
Available for NEC Class I,
Division 1 or Division 2,
Group D
Reliable microprocessor-based
control circuitry
Operates load/unload devices
SWICHGAGE
®
instruments
included in control panel
Includes hourmeter
Accepts discrete analog inputs
Tachometer on
engine drive units
Operating parameters
field adjustable without
reprogramming
Expandable to interface with
multiple compressors or
multiple station controls
RS485 communications port
Wide variety of optional
features
Extremely user friendly
12, 24 VDC or 120 VAC power
required
Compatible with stand alone
priority/sequential controls
(see page 5)
NEMA 3 enclosure
LEVEL II
3
Suitable for larger stations with
simplex or duplex compressor(s).
LEVEL II Div. 2 Control System
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
®
MicroController™ 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
Murphy offers Priority/Sequential
Valve Panels complete with
Murphy Pressure Transmitters for
use with the LEVEL III control
system or the Murphy StandAlone Priority/Sequential
Controller. These panels were
designed to fail close valves for
optimum operation. These
panels can be provided on a plate
or in a free standing NEMA 3
weatherproof enclosure.
Murphy strives to offer the most
effective and timely support in the
industry. Whether your needs are
panel service, re-programming or
complete system upgrades using
dependable and proven Murphy
equipment, our qualified staff is
eager to assist.
Priority/Sequential Valve Panels
5
Valve Panel for 2 fast fill drops, 1 slow fill
header, and 3 bank cascade storage.
Valve Panel for 4 fast fill drops, 1 slow
fill header, and 3 bank cascade storage.
Custom Valve Panels
Retrofit and Service Support
Layout of Typical CNG Fueling Station
6
DOT
Cascade
PT
Slow Fill
Header
Driver
Storage Tanks
Compressor
Optional Bypass
Valves (for fast fill)
H
PT
M
PT
L
PT
Priority
Valves
Priority/Sequential
Valve Panel*
LEVEL I
or
LEVEL II
Control
System
LEVEL III
Control
System
Priority/
Sequential
Valve
Control
Panel
PT
Dispenser†
Sequential
Valves
(2-drop
panel)
PT
* These items are not included in a
LEVEL III control system.
Order seperately.
†
For this standard configuration, the
dispenser must provide a dry contact
closure to initiate a fill and a 4-20 mA
flow rate signal for each drop.
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