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The EM02 is UAV Navigation’s most complete engine monitor for piston engines. Its small size and light weight make it ideal for most experimental aircraft and large sized UAVs. The EM02 can monitor all the typical engine parameters for any standard 4-cylinder piston engine.
The EM02 can provide any EFIS or onboard electronics with measurements at 5 Hz. These include RPMs, manifold pressure, oil pressure and temperature, water temperature, fuel pressure and net fuel flow, four cylinder head temperatures (CHT), four exhaust gas temperatures (EGT), three fuel quantities, and total engine-on time.
With regard to RPM measurement, it can be done using optocoupler sensors, hall effect sensors, and inductive pickups. A programmable scaling range allows multiple pickup pulses per revolution.
Using 6-point characterization curves, the EM02 can accept the widest variety of resistive, capacitive and thermo-couple sensors. Additionally, its flexible interface can be configured for thermistor or thermocouple CHT sensors.
The EM02 accepts forward and return fuel flow sensors to calculate net fuel flow. It can measure up to three different fuel quantities using capacitive probes, and automatically control fuel pumps based on one of the fuel quantities (typically a header tank). The fuel probes can optionally be connected through a shielded connector, and are diode-protected to prevent electrostatic discharges.
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SENSORS
RPM Sensor
RPM Range
RPM Resolution
Manifold pressure sensor
Oil pressure sensor
Oil temperature sensor
Water temperature sensor
Fuel pressure sensor
Fuel flow sensors (2)
CHT sensors (4)
EGT sensors (4)
Fuel quantity sensors (3)
Carburetor temp. sensor
Engine total time counter
RANGES
Thermocouple sensitivity
Resistive sensor ranges
Capacitive sensor ranges
COMMUNICATIONS
Baud rate
Method
Sample rate
ELECTRICAL
Supply (unregulated)
Power consumption
MECHANICAL/ENVIRONMENTAL
Size (mm, H x W x L)
Weight
System connector
Fuel quantity probes connector
Engine probes connector
Temperature range |
Optocoupler, hall, or inductive
250 to 50,000 RPM
1% (up to 14,000)
2% (up to 25,000)
<5% (up to 50,000)
Proprietary (up to 30 psi)
Resistive
Resistive
Resistive
Resistive
Optocoupler or hall effect
Thermistor or thermocouple
Thermocouple
Capacitive
Resistive
0 to 1 M hours
8 uV
0 to 2.95 K Ohm
50 pF to 100 nF
38.4 Kb/s (full duplex)
RS-232
5 Hz
9 V to 36 V
150 mA
30.3 x 102.6 x 123.3
260 g
MS3112E-8-4P
MS3112E-10-6P
DB-37 (female)
-40°C to +85°C
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