Subsea Form Factor - SBG Navsight Ekinox IMU Hardware Manual

Navsight Solution – Hardware Manual

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
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
●
Specifications
The table below summarizes all mechanical and environmental specifications.
Electrical and Mechanical Specifications
Enclosure materials
Dimensions
Weight in air
Weight in water
Input power voltage
Power consumption
Environmental specifications
Depth rating
Humidity
Operating Temperature
range
Storage Temperature range
Shocks
Operating Vibrations
MTBF
Calibration interval
symbol. This point is defined to simplify installation.
Titanium
Ø 9.2 x 7,0 cm
1.0 Kg
0.86 Kg
12 – 36V DC – isolated power supply
1.6W typical.
200m
Sealed, no limit
-20 to 60°C – specified range
-40 to 71°C – operating range
-40 to 85°C
500 g for 0.3 ms
3g RMS – 20Hz to 2 kHz as per MIL-STD-810G (A2 range options)
50.000 hours
None required, maintenance free
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Figure 2.4: Ekinox Subsea IMU
symbol.
NAVSIGHTHM.1.3