Hydro- Bios Nansen Closing Net

Nansen Closing Net

Oceanographic closing net for vertical operations

ABOUT

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 100µm (upper conical part) and gaze of 55µm (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.

Hydro-Bios No. 438 505 | Vertical Oceanographic Plankton Nets

• Spare Parts
• Accessories

Spare Net Part

Spare netbag for Nansen Closing Net
made of  Tetex, 100µm and 55µm gaze

Messenger-operated closing mechanism

including messenger 800 g and closing rope

Hydro-Bios No. 438 520

Messenger

with 10mm bore, 800g

Hydro-Bios No. 440 003

Spare Vertical Net Bucket

complete with net bucket frame

mesh size

Choose an option…  1550µ1000µ780µ500µ405µ335μ300µ275µ250µ225µ200µ150µ120µ100µ90µ85µ80µ70µ75µ64µ60µ55µm Standard50µ48µ41µ30µ25µ20µ15µ10µ5µ Clear selection

Hydro-Bios No. 438 975

TECHNICAL DATA
Material	Net ring and net bucket frame: Stainless steel  Closing mechanism: Powder-coated and nickel-plated brass  Net bag: MOnyl (PA)  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 microns

ORDERING INFORMATION
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 microns c Net part, conical, length 1 m, 55 microns 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 microns
438 520	Messenger-operated closing mechanism,  including messenger 800 g and closing rope
440 003	Messenger, with 10mm bore, 800g
438 975	Spare Vertical Net Bucket, complete with net bucket frame