EMU-1 Engine Monitoring Unit
View essential engine data from an NMEA 2000 multi-function display.
The Actisense EMU-1 is a specialised analogue to NMEA 2000 Gateway which converts data from analogue engine gauges/senders into NMEA 2000 data. Please refer to the FAQs for gauge/sender compatibility details.
New features and updates will be added to the Configuration Tool on a regular basis. Please check you are using the latest Configuration Tool and Firmware version by going to the Downloads page.

The EMU-1 can monitor vital engine parameters such as temperature, pressure RPM and fluid levels from up to two engines.

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 Actisense NGT-1 NMEA 2000 PC Interface is available for every EMU-1 installation. The NGT-1 can be used to update the Firmware, connect the Configuration Tool and display data on a PC for diagnostic and information purposes, using NMEA Reader. Please visit the NGT-1 page for product details.

The EMU-1 is available with the SeaTalkNG to NMEA 2000 adaptor Cable - STNG-A06045
The SeaTalk NG to NMEA 2000® adaptor cable (STNG-A06045) is not available as a standalone product and must be bought as part of a bundle.

An optional DIN rail mounting kit is also available. The kit is suitable for use with a top hat rail, type EN 50 022 or a G section rail, type EN 50 035. Please order the DIN rail kit using part number: DIN-KIT-1.
Geek Mode
  • Enables analogue gauge/sender information to be converted to NMEA 2000® messages
  • Supports up to two engines with a single EMU-1
  • Six gauge/parameter inputs
  • Four alarm inputs
  • Two Tach inputs
  • Supports 12V and 24V systems
  • Bulkhead mount, with optional DIN rail mount kit
  • Total engine hours are logged by the monitoring of engine Tach (RPM) input
  • PC based configuration tool for customised installation
  • Connect signals from fluid level gauges to NMEA 2000®

Technical Specification

Power Supply
Supply Voltage 9 to 35V DC
Supply Current Typically < 25mA @ 12V DC
Supply Protection Continuous reverse polarity protection and load dump protection (meets SAE J1113)
Supply Connector Pluggable 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
Compatibility Fully NMEA 2000 certified
Galvanic Isolation 2500V input to ground, 1500V output to ground using ISO-Drive
Speed / Baud Rate 250kbps
NMEA 2000 Connector M12 male (A coded) connector
Gauge Inputs
Voltage Range 0 to 35V DC
Input Impedance > 50kΩ
Sender Feed 0, 4 or 18mA
Accuracy <= 2%
Input Connector Pluggable 6-way screw terminal, 3.5mm pitch
Input Protection Overvoltage protection to ±40V
Alarm Inputs
Voltage Range 0 to 37V DC
Input Impedance > 50kΩ
Threshold Voltage Configurable, default is 5V
Alarm Polarity Configurable, default is alarm on low input
Accuracy <= 2%
Input Connector Pluggable 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 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, 3.5mm 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
Mechanical
Housing Material Polycarbonate
Protective Lid Material Polycarbonate
Sealing Materials Expanded silicone foam gasket, closed cell polyurethane splash guard and ePTFE waterproof vent
Dimensions 127mm (L) x 112mm (W) x 48mm (H)
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
Guarantee 3 years
EMU-1 Engine Monitoring Unit
Where to buy
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Testimonial
"We have been working with Actisense for more than 9 years now. Our sales in terms of units raise to a 4 digit figure. As far as I can remember, we have returned just one NMEA Buffer back to the manufacturer under warranty. That says it all."
Alberto Olmos, Sales Director, Aage Hempel Crame
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