Regular price $996.52 $0.00

NMEA 2000 Engine Monitoring Unit

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The EMU-1 has a PC based configuration tool that allows the settings inside the EMU-1 to be changed to best suit the engine it is working with, making it a flexible solution for many engine makes and models. An Actisense PC to NMEA 2000 Gateway (NGT-1) is required to configure the EMU-1.

It is recommended that an NGT-1 is available for every EMU-1 installation. The NGT-1 can be used to update the firmware, connect the Toolkit and display data on a PC for diagnostic and information purposes, using NMEA Reader.


  • Enables analogue signals to be converted to NMEA 2000 messages
  • Convert signals from up to two engines (that share a common ground) with a single EMU-1
  • 6 gauge / parameter inputs
  • 4 alarm inputs
  • 2 additional auxiliary inputs
  • 2 Tacho inputs
  • Customised IP65 case
  • Diagnostic LEDs
  • Wide power compatibility of 9 to 35 Vdc


  • No need to change an existing engine
  • Easy installation
  • Easy to configure to suit the connected engine
  • Connect signals from fluid level gauges (that share a common ground with the engine) to NMEA 2000®
  • Optional DIN rail mounting kit available
  • Total engine hours are logged by the monitoring of engine Tach (RPM) input

Power Supply

Supply Voltage9 to 35V DC
Supply CurrentTypically < 25mA @ 12V DC
Supply ProtectionContinuous reverse polarity protection and load dump protection (meets SAE J1113)
Supply ConnectorPluggable 2-way screw terminal, 3.5mm pitch
Supply Voltage (NMEA 2000 Port)9 to 29V DC
Supply Current (NMEA 2000 Port)< 20mA @ 12V DC from NMEA 2000 bus
Load Equivalent Number (LEN)1
Supply Protection (NMEA 2000 Port)


Continuous reverse polarity protection and overvoltage protection to 40V


NMEA 2000 Port – In/Out

CompatibilityFully NMEA 2000 certified
Galvanic Isolation2500V input to ground, 1500V output to ground using ISO-Drive
Speed / Baud Rate250kbps
NMEA 2000 Connector


M12 male (A coded) connector


Gauge Inputs

Voltage Range0 to 35V DC
Input Impedance> 50kΩ
Sender Feed0, 4 or 18mA
Accuracy<= 2%
Input ConnectorPluggable 6-way screw terminal, 3.5mm pitch
Input Protection


Overvoltage protection to ±40V


Alarm Inputs

Voltage Range0 to 37V DC
Input Impedance> 50kΩ
Threshold VoltageConfigurable, default is 5V
Alarm PolarityConfigurable, default is alarm on low input
Accuracy<= 2%
Input ConnectorPluggable 4-way screw terminal, 3.5mm pitch
Input Protection


Overvoltage protection to ±40V


Tacho Inputs

Voltage Range±3 to ±60V
Input Impedance> 100kΩ to ground
Input Pulse Range4 to 50,000Hz
Accuracy<= 1%
Sender CompatibilityIgnition coil, alternator (“W”, “R” or “AC”) terminal, hall effect, VR or inductive sender
ThresholdAutomatically adjusts to signal level
Input ConnectorPluggable 4-way screw terminal, 3.5mm pitch
Input Protection


Can withstand an ignition pulse to ±500V


Engine Log

Engine Hours


2 separate engine hour logs internally connected to the tacho Inputs. Hours are logged when RPM is present, stored in non-volatile memory



Housing MaterialPolycarbonate
Protective Lid MaterialPolycarbonate
Sealing MaterialsExpanded silicone foam gasket, closed cell polyurethane splash guard and ePTFE waterproof vent
Dimensions127mm (L) x 112mm (W) x 48mm (H)


4 x 3.5mm lugs to allow panel mount with self tapping s/s screws (included), optional DIN Rail mount available on request


Approvals and Certifications

Fully NMEA 2000 Certified
EMCEN 60945 (sections 9 & 10)
Environmental ProtectionIP66 (PCB housing)
Operating Temperature-20°C to +55°C
Storage Temperature-30°C to +70°C
Recommended Humidity0 – 93% RH
Guarantee3 years

Data Sheet



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