Specifications

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2.3 Service
2.3.1 WR-SG and DWR-MkIII wave motion sensor
The stabilized platform vertical accelerometer consists of a fluid-filled sphere. Over the years
the fluid evaporates through the Perspex sphere. Check the fluid level at least once every three
years. Experience has it that a small refill is required every three years. Section 5.4 will explain
where to check and how to refill.
As long as the sphere is correctly filled, the motion sensor is a robust sensor with nearly
perfectly buoyant invulnerable mechanics in the fluid. However, with insufficient fluid inside
the sphere, the mechanics in the fluid will no longer remain perfectly suspended and ultimately
will collapse under its own load if deployed at sea. For a long life of your wave motion sensor
carefully maintain the sensor fluid level.
When in doubt, several tests in section 5.4 describe how to roughly verify the correct
functioning of your motion sensors.