Nansen Closing Net

This post is also available in: viVietnamese

Oceanographic closing net for vertical operations
The Nansen Closing Net is a vertical plankton net with messenger operated closing mechanism. A 70 cm diameter stainless steel ring with a 3 meter long net bag, made of  Tetex (zylindrical part), gaze of 100 µm (upper conical part) and gaze of 55 µm (lower conical part and side window of Netbucket), is operated in conjunction with a heavy net bucket frame for high towing rope speed during descent. For easy retrieval the sample is concentrated inside a removable plastic net bucket with side window (covered with sieve gauze). The open net is brought to the greatest scheduled depth. During ascent the net can be closed in the intended depth by strangulating the net bag below the net ring. This allows for sampling defined depth layers. The Nansen Closing Net can be used in conjunction with one Mechanical Flow Meter with back-run stop for measurements of filtered water volume.

  • Technical Data 
  • Ordering Information 
Material Net ring and net bucket frame: Stainless steel 
Closing mechanism: Powder-coated and nickel-plated brass 
Net bag: MOnyl
Net bucket: PVC
Dimensions 70 cm x 350 cm (dia. x l)
Weight 30 kg
Mouth opening 70 cm dia./0.3848 m²
Mesh size 100/55 µm
Products
438 505 1. Messenger-operated closing mechanism, 
including messenger 800 g and closing rope
2. Bridle of Nylon rope with thimble and shackle
3. Net ring of stainless steel with loops for bridle and 
bucket ropes, with Nylon webbing and zip fastener.
4. Net Part, consisting of:
a) Canvas part, cylindrical, with zip fastener and loops for 
the closing rope, length 100 cm
b) Net part, conical, length 1 m, 100 µm
c Net part, conical, length 1 m, 55 µm
5. Vertical Net Bucket consisting of:
a) Fixing Ring with over centre fasteners
b PVC Net Bucket with side windows covered with sieve gauze
c) Net Bucket Frame for vertical operation
Accessories
438 115 Mechanical Flow Meter with back-run stop for counting 
the amount of water passing through the net
Spare Parts
438 507 Spare Net Part, 100 / 55 µm
438 520 Messenger-operated closing mechanism, 
including messenger 800 g and closing rope
440 003 Messenger for ropes up to 10mm, 800g
438 975 Spare Vertical Net Bucket, complete with net bucket frame

Check Also

Neuston Net David/Hempel Model 300

This post is also available in: Vietnamese Plankton net for sampling surface and sub-surface fauna …

Leave a Reply

Your email address will not be published. Required fields are marked *