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EMS-92199B
Revised 05-03
Catalog Section 40
(00-02-0101)
Electronic Monitoring Systems
EMS447 / EMS448 Controllers
■
Full Equipment Protection
(1)
■
Field Adjustable Parameters
(1)
■
First-Out Shutdowns and/or Alarms
(1)
■
Shutdown History File
(1)
■
Service Reminders
(1)
■
Back Lit LCD or VFD Alphanumeric Display
■
1/4 DIN or NEMA 4X Enclosed Models
Patent
Pending
Description
The EMS447 and EMS448 Electronic Monitoring
Systems/Controllers are micro-processor based for
monitoring and control of equipment functions. The
basic EMS system is programmed for a typical
industrial engine power unit. Custom programming
is available to adapt the EMS to a wide variety of
engine and equipment requirements.
Basic programs provide auto-start/manual start and
first-out shutdown for engine functions such as pres-
sure, temperature, level and overspeed. Necessary
time delays for start up lockout are included.
Operating data is displayed on a 32 character back
lit alphanumeric liquid crystal display.
The EMS operating parameters are configured
through a simple three-button interface. Access to
the system memory is controlled by entry codes.
A password-protected program uses built-in memo-
ry to display the alarm/shutdown history, including
a display of the last ten shutdowns, when and why
they occurred and displays all of the engine operat-
ing conditions at time of last shutdown.
Basic Program Features
An on-board hourmeter keeps a log of equipment
running hours and alerts you when to change oil,
filters and perform other routine service.
Ramp Oil Pressure monitoring protects equip-
ment at both high rated speed and low idle speed.
For instance, based on engine manufacturer’s
requirement, shutdown could occur at 30 lb. (207
kPa) pressure at 1800 RPM or at 5 lb. (34 kPa) at
600 RPM or any shutdown point in between.
Basic Models
EMS448 has an extruded aluminum enclosure
suitable for panel mounting. Wiring is via
optional wiring harness. Relay boards are
available for additional relay contact capabil-
ity. Refer to “Accessories” on the back page.
EMS448 has a NEMA 4X type enclosure. Wiring is
connected directly to the relay board terminal
block located within the enclosure. Relay board
for additional relay contact capability is avail-
able. See “Optional Accessories” on reverse side.
Applications
●
Industrial Engines
●
Compressors
●
Generators
●
Trucks
●
Construction Equipment
●
Pumps
Specifications
Input Voltage: 10 to 28 VDC.
Operating Temperature: -4 to 149°F (-20 to 65°C).
Storage Temperature: -4 to 149°F (-20 to 65°C).
Display: Alphanumeric: 2-line, 32 character
backlit LCD (standard); VFD optional.
Relative Humidity: 95%RH @ 140°F (60°C).
Communications: RS485 port, standard.
Sensor Inputs:
•
Digital: 3-optically-isolated inputs, (positive volt-
age or ground) such as from Murphy SWICH-
GAGE
®
instruments.
(2)(3)
•
Analog: Up to 8 inputs–accepts a variety of resis-
tive sending units, such as from Murphy electric
gage senders. NOTE: When resistive sending
units are used, one input will be designated for
battery voltage sensing. The use of 2-wire type
senders is strongly recommended. Special order
analog inputs available (4-20 mA or 0-5 VDC).
•
Frequency: 1 optically-isolated input for speed
reference, such as MP3298 magnetic sensor.
EMS447 Outputs:
•
3-Transistor digital: 125 mA sinking.
(4)
•
3-Relay: SPST 3A @ 30VDC N.O. connected to
battery positive*.
•
S449-4 Relay Board (optional)*:
2-Transistor digital: 125 mA sinking.
4-Relay: 2-SPST, 5A @ 30 VDC, 250 VAC,
1/10 hp @ 120 VAC;
(4)
2-DPDT, 2A @ 220 VDC,250 VAC.
(5)
•
S449-2 Relay Board (optional)*:
6-Dry Relay: 4 SPST, 5A @ 30 VDC, 250 VAC,
1/10 hp @ 120 VAC;
(4)
2 DPDT, 2A @ 220 VDC, 250 VAC.
(5)
EMS448 Outputs:
•
2-Transistor digital: 125 mA sinking.
•
4-Relay: 2-SPST, 5A @ 30 VDC, 250 VAC*,
1/10 hp @ 120 VAC;
(4)
2-DPDT, 2A @ 220 VDC,250 VAC.
(4)
•
S449-1 Relay Board (optional)*:
6-Dry Relay: 4 SPST, 5A @ 30 VDC, 250 VAC,
1/10 hp @ 120 VAC;
(4)
2 DPDT, 2A @ 220 VDC, 250 VAC.
(5)
Shipping Weights and
Dimensions
EMS447: 2-
1
/4 lb (1 kg); 9-
1
/4 x 8-
1
/4 x 5-
1
/4 in. (235
x 210 x 133 mm).
EMS448: 3-
1
/2 lb (1.5 kg); 12-
1
/4 x 7-
1
/4 x 5-
3
/4 in.
(311 x 184 x 146 mm).
(1)
Program specific.
(2)
One additional input can be ordered and traded for one transistor output.
(3)
Isolates the internal circuitry of the Murphy EMS from the sensor
input circuitry to help avoid electrical noise and damage.
(4)
One additional output can be ordered and traded for one digital input.
(5)
One DPDT pole has common connected to battery+. N.O. available
fused and unfused.
*Not Class I, Division 2 approved.
EMS447
R
Approved for Cl. I,
Div. 2, Grps. C & D
areas on EMS447
(all transistor out-
puts) and EMS448
(board only).
R
C
EMS448