Navsight Solution
– Hardware Manual
NAVSIGHTHM.1.5
2.2.1.4. Subsea form factor
The Ekinox IMU Subsea is composed of titanium parts, one for the
cover and one for the base plate. The device uses a subsea connector
to offer a depth rating of 200 m and good resistance to seawater
environment.
Mechanical alignment
For best measurement accuracy, a good mechanical alignment is
required. During manufacturing, the Apogee IMU frame has been
carefully aligned to 0.02° with the base plate for roll, pitch and yaw.
To ease the yaw alignment (X axis), the base plate features two
alignment holes Ø 4 mm H8 that guarantees with two taper pins
Ø 4 mm h7 a yaw alignment better than ±0.04°.
Origin of measurements
The Ekinox IMU offers the possibility to output data at different measurement points. The default center of
measurement is located on top of Ekinox enclosure, on the coordinate frame center drawing. It is
represented on the mechanical outlines by the symbol. This point is defined to simplify installation.
Alternatively, user can select between two other center of measurement points:
●
Alignment hole (aligned to the bottom of the base plate)
●
Bare IMU center of measurement, represented by the symbol.
Specifications
The table below summarizes all mechanical and environmental specifications.
Electrical and Mechanical Specifications
Enclosure materials
Titanium
Dimensions
Ø 9.2 x 7,0 cm
Weight in air
1.0 kg
Weight in water
0.86 kg
Input power voltage
12 – 36 V DC – isolated power supply
Power consumption
1.6 W typical.
Environmental specifications
Depth rating
200 m
Humidity
Sealed, no limit
Operating Temperature
range
-20°C to 60°C – specified range
-40°C to 71°C – operating range
Storage Temperature range
-40°C to 85°C
Shocks
500 g for 0.3 ms
Operating Vibrations
3 g RMS – 20 Hz to 2 kHz as per MIL-STD-810G (A2 range options)
MTBF
50 000 hours
Calibration interval
None required, maintenance free
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Figure 2.4: Ekinox Subsea IMU
