單元大綱

  •  The CTD water sampling system is a combination of a wired CTD, a water sampling device, and a water sampler, allowing for accurate water sampling at the desired depth while recording and monitoring CTD readings in real time.

     The water sampling device has multiple triggers arranged in a radial pattern, and the water samplers are arranged around the sampling device (also called a rosette-type sampling device because of its shape). Water can be collected from the same number of samplers at different depths in a single observation, or more seawater samples can be collected from the same layer by closing the lids of several samplers at the same depth.

    CTD採水システム

    Fig. 10 Configuration of CTD water sampling system and trigger mechanism of water sampling device

    アーマードケーブル　Armored Cable

    多筒採水装置　Multi-tube water sampling equipment

    ニスキン採水器　Niskin water sampler

    保護フレーム　Protective frames

    採水器架台　Water sampler trestle

    CDT水中局　CDT submersible station

    Fig. 11 CTD water sampling system (12L Niskin X water sampler, 12 hangers) being put into the sea

     CTD water sampling systems are available with 12, 24, or 36 samplers, depending on the number of samplers that can be equipped. The greater the number of samplers, the more layers and seawater can be sampled, but the number is limited by the capacity of the vessel's observation equipment, such as cranes and winches.


    • Setting up the water sampler in a multi-tube sampler

      　As with the direct wire attachment method, open the lid of the water sampler before placing it in the sea. The tegus that secure the lid are set on the trigger of the multibarrel sampler, not on the trigger mechanism of the sampler itself (Fig. 12).

      ニスキン採水器　多筒採水装置へのセッティング

      Fig. 12 Setting up the water sampling device

      採水装置トリガー部拡大図　Enlarged view of water sampling device trigger section

      スナップフック拡大図　Enlarged view of snap hook

      a) Hook the end of the tegus connected to the upper lid onto the trigger of the water sampling device to secure the upper lid in the open position.　b) Secure the lower lid in the open position by hooking the snap hook on the lower end of the lower lid's ring-shaped tegus, which has been branched off from the upper lid's tegus and extended downward.