Subsea Form Factor - SBG Navsight Ekinox IMU Hardware Manual

Navsight Solution – Hardware Manual

2.2.2.4. Subsea form factor

The Apogee Subsea IMU enclosure is composed of titanium parts, one for
the cover and one for the base plate. The device uses high quality
connectors 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 angles.
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 Apogee IMU offers the possibility to output data at different measurement points.
The default center of measurement is located on top of Apogee 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
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
Titanium
Ø 9.2 x 7,0 cm
1.32 Kg
0.98 Kg
12 – 36V DC – isolated power supply
2.5W 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
1 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 2.6: Apogee Subsea IMU
symbol. It is defined to simplify installation.
symbol.
NAVSIGHTHM.1.3