Halltech Environmental and Aquatic Research Inc. products

Our core sampler series is unmatched for its versatility as all the corer heads are interchangeable with any of the styles of corer tubes. Three styles of corer heads are available: Messenger Released, Gravity Corer, Hand Corer.

Secchi Discs are designed for the measurement of the relative turbidity and clarity of water body. This disc is constructed of powder coated steel, and is finished in alternating black and white quadrants of acrylic paint. The disc operates as such: the disc is lowered into the water on a graduated line. The depth at which the disc is no longer visible is reorded. The disc is then raised, and recording of the depth at which the disc reappears should be made. The mean of these two recordings is considered to be the limit of visibility. Although the disc is unable to provide an actual measure of light penetration, it is useful in providing a rough index of visibility for comparative purposes.

For Paleoecological Analysis of bog and salt march sediments, collection of uncompressed cores in poorly decomposed woody peat, and shallow water applications. Constructed of 5.4 cm O.D. 2 mm wall Stainless Steel, 50 cm long core tube of this apparatus is designed to cut through sediments as it is turned. A solid Delrin bottom point and core head support a stainless steel cover plate which is curved and sharpened to reduce disturbance as it is inserted into the peat or sediments. Comes complete with two 1 m Aluminium extension rods, and an Aluminium turning handle.

Sediment samplers, depth integrating, point integrating or bed material samplers are available through Halltech in either rod suspended or cable suspended systems. Some sediment samplers may require power to actuate a valve or gate to allow entry of sediment through the entry tube and into the sampler bottle.

For Paleoecological Analysis, Deep water sediments and Benthic community analysis. The Bronze Slide Hammer travels freely on a 2.5 cm dia stainless steel rod and may be lifted and dropped to force the Corer Head through harder substrates. The Core Head is constructed of Delrin and stainless steel. During penetration, water is allowed to pass through the core tube by a own way check valve. This same valve prevents the loss of sediment during retrieval by creating a vacuum.

Wisconsin Plankton Net is a popular and versatile plankton sampler. The main design feature is the anterior reducing cone which makes it more efficient than a standard conical net. The Wisconsin Net is used only for vertical sampling tows. The sampler consists of three major parts: an anterior reducing cone, a posterior conical filtering net, as well as a collection bucket. Standard net sizes are 80 and 153 microns, and other sizes are available upon request. The net may be ordered with carrying case and with or without a collection bucket.

Drifts nets are stationary nets designed to sample organisms from flowing water such as streams, rivers and tidal creeks. They can be used to capture organisms at and below the surface of the water. Nets can be used individually or in groups with he nets strung out side by side. The frame is manufactured from 3/8 ” stainless steel and is 12″ x 18″ (30 x 45 cm) in dimension. The net itself is 39″ (99 cm) long. The unit comes with two stainless steel stakes and is available with or without a collection bucket. The standard size netting is 363 microns, and other mesh sizes are available upon request. The stream drift net may be ordered with or without a carrying case.

Designed to take bottom samples of a small surface area, the T sampler is constructed of 6 mm ABS Drain Pipe. The main body is a 4″(10.2 cm) inside Diameter Sanitary T-Fitting. The front of the pipe has a 19 cm Long x 12.5 cm High hole covered with S.S. mesh. A NITEX mesh sleeve connects the T- Fitting to a PVC collection bucket. The standard mesh size is 500 micron and other sizes are available upon request.

Gravel and cobble bottoms in streams are effectively sampled with the Hess Sampler. The Canton modification is a stainless steel cylinder with two large openings covered with NITEX mesh. By attaching handles to either end of the sampler, penetration depths of 75 or 150 mm can be achieved in gravel or cobble stream bottoms. Water flow in through the upstream opening of the Hess Sampler and out through the downstream window and into the collection net and bucket. Flora and fauna contained in the stainless steel tube are washed into the collection bucket. Standard size is 500 microns and other sizes are available upon request.

This Surber sampler is designed for sampling riffle areas in streams and rivers up to a depth of about 18″. It consists of two folding stainless steel frames set at right angles to each other. The horizontal frame encloses an area of 12″x 12″ and marks out the limits of the sampling area. Attached to the vertical frame is a net to catch the invertebrates as they are dislodged from the substrate. The net is approximately two feet in length and is made of tough, rot -resistant 500 micron (35 mesh per inch) NITEX monofilament net. The Surber Stream Bottom Sampler folds flat for easy storage and comes complete with a wooden carrying case to protect the net when not in use. A base height extension may also be used when the horizontal frame must penetrate into the actual stream bed itself. Replacement NITEX nets and samplers with other micron net sizes are available.