Envco – Environmental Equipment

Birge closing net - Has long inlet cone. Used for vertical and horizontal sampling within a specific zone of water. Consists of 2 truncated cones connected at their bases. Has more filtering area than a conical net. Folds, closes at a specific depth.

Ideal for vertical plankton tows when you need to sample a specific stratum in an integrated water column. After you’ve reached your desired depth and taken your sample, close the net by sending a messenger down the line. Raise vertically at an even speed of 0.5 m/s.

The truncated design improves filtration efficiency and consists of four parts: a tapered upper cylinder, the closing portion; a conical filtering net; an attached dolphin adaptor; and a stainless steel Wisconsin bucket whose 10 oz. weight insures the net’s rapid descent. The closing portion consists of a stainless steel body, towing eye and release tab. A separate lowering and retrieval line is attached to the middle ring between the two cones. Wt: 5 lbs

Specifications:
• Overall: 180 x 1100 mm (7 x 43”)
• Mouth diameter: 130 mm (5”)
• Second ring diameter: 180 mm (7”)
• Includes: 48-C60 Dolphin™ adaptor;

40-D70 stainless steel Wisconsin bucket with strip, 284 g (10 oz), 200 mL; 62-C15 line (100’); 46-D80 solid messenger (8 oz)

Birge Net Includes:48-C60 adaptor; 40-D70 bucket; 62-C15 line; 46-D80 messenger.
21-A15 Birge Net, 80 μm Nitex®
21-A35 Birge Net, 153 μm Nitex®

Replacement Birge nets (with ring and bridle):
21-C30 80 μm Nitex® Birge net, Net only.
21-C40 153 μm Nitex® Birge net, Net only

Accessories and replacement parts:
21-C12 Closing release
910-G22 Plastic molded carry case
48-C60 Dolphin™ adaptor
62-C15 Line, 3/16” diameter, 100’
46-D80 Solid messenger, 8 oz
40-D80 Stainless steel bucket, 200 mL, 80 micron
40-D82 Stainless steel bucket, 200 mL, 153 micron