Actisense NMEA 2000 Engine Monitoring Unit - EMU-1

The Actisense EMU-1 Engine Monitoring Unit shares vital engine information on the NMEA 2000® bus by digitizing analogue engine sensors. A EMU-1 unit can be configured to suit the engine it is working with, offering a flexible solution for multiple engine makes and models. It is capable of reading a wide range of engine parameters, and will report how the engine is operating and share the information across the network.

Features:

• Enables analogue signals to be converted to NMEA 2000® messages
  • Upgrades an existing engine, allowing older engines to be used with to the latest digital MFDs
• Convert signals from two engines (that share a common ground) with a single EMU-1
• Six gauge/parameter inputs for connecting to resistive/voltage gauges or resistive senders
• Four alarm inputs connects directly to alarm switches or gauge signals and maps them to NMEA2000 alarms
• Two Tacho inputs for connecting directly to the RPM signals from 1 or 2 engines (with a common ground)
• Two additional auxiliary inputs for future expansion opportunities
• Customized case protects electronic parts and connections
• Input protection protects against reverse polarity and transients
• Wide power compatibility of 9 to 40 VDC for use on most common power systems
• Bulkhead mount, with optional DIN rail mount kit
• Total engine hours are logged by the monitoring of engine tach (RPM) input
  • Accumulated engine running hours are stored and shared as NMEA 2000 data

Specifications:

Power

• Voltage: 9 to 35 VDC
• Current: Typically < 25mA @ 12 VDC
• Protection: Continuous reverse polarity protection and load dump protection (meets SAE J1113)
• Connector: Pluggable 2-way screw terminal, 3.5mm pitch
• Voltage (NMEA 2000 port): 9 to 29 VDC
• Current (NMEA 2000 port): < 20mA @ 12 VDC from NMEA 2000 bus
• Load equivalent number (LEN): 1
• Protection (NMEA 2000 port): Continuous reverse polarity protection and overvoltage protection to 40V

NMEA 2000 Port In/Out

• Compatibility: Fully NMEA 2000 certified
• Galvanic isolation: 2500V input to ground, 1500V output to ground using ISO-Drive
• Speed / baud rate: 250 kbps
• NMEA 2000 connector: M12 male (A coded) connector

Gauge Inputs

• Voltage range: 0 to 35 VDC
• Input impedance: > 50kΩ
• Sender feed: 0, 4 or 18mA
• Accuracy: <= 2%
• Input connector: Pluggable 6-way screw terminal, 3.5 mm pitch
• Input protection: Overvoltage protection to ±40V

Alarm Inputs

• Voltage range: 0 to 37 VDC
• Input impedance: > 50kΩ
• Threshold voltage: Configurable, default is 5V
• Alarm polarity: Configurable, default is alarm on low input
• Accuracy: <= 2%
• Input connector: Pluggable 6-way screw terminal, 3.5 mm pitch
• Input protection: Overvoltage protection to ±40V

Tacho Inputs

• Voltage range: ±3 to ±60V
• Input impedance: > 100kΩ to ground
• Input pulse range: 4 to 50,000Hz
• Accuracy: <= 1%
• Sender compatibility: Ignition coil, alternator ("W", "R" or "AC") terminal, hall effect, VR or inductive sender
• Threshold: Automatically adjusts to signal level
• Input connector: Pluggable 4-way screw terminal, 3.5 mm 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

Mechanical

• Housing material: Polycarbonate
• Protective lid material: Polycarbonate
• Sealing materials: Expanded silicone foam gasket, closed cell polyurethane splash guard and ePTFE waterproof vent
• Dimensions (LxWxH): 127 x 112 x 48 mm
• Weight: 250g
• Mounting: 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
• EMC: EN 60945 (sections 9 & 10)
• Environmental protection: IP66 (PCB housing)
• Operating temperature: -20° C to +55° C
• Storage temperature: -30° C to + 70° C
• Recommended humidity: 0 - 93% RH

Data Sheet

User Manual