Sheave unit

The sheave unit features a small motor to keep the line tensioned between the sheave and the drum.

Mount the sheave unit above the water on an A-frame or a boom, in line with the drum unit. When extending or retracting the A-frame, keep the line slack at all times.

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Sheave unit, transparent view

  1. Bell mouth – Holds the instrument when it is retrieved

  2. Bell mouth switch – Detects the presence of the instrument

  3. Line tensioner motor – Drives the line tensioner rollers

  4. Line tensioner rollers – Keep tension on the rope during spooling and unspooling

  5. Fairlead – Entry point of the sheave unit

  6. Sheave wheel – Guides the line to the line tensioner rollers

  7. Line exit guide – Guides the line at the exit

  8. End-cap cradle – Cradles the instrument end-cap inside the bell mouth; activates the drum limit switch

  9. RBRcervello box – Contains the RBRcervello data controller for extended memory and data hosting option