Bottom Sediment Grab Samplers
These samplers are designed to collect an
accurate representative sample of the sediment
bottom. The bite of the sampler should be deep
enough so all depths are sampled equally. The
closing mechanism is required to completely close
and hold the sample as well as prevent wash-out
during retrieval. Likewise, during descent the
sampler should be designed to minimize disturbance
of the topmost sediment by the pressure wave as it
is lowered to the bottom.
The Ekman, Ponar and Van Veen samplers
meet these requirements and are excellent samplers
for lakes and slow moving rivers and streams. The
BM-60 and BM-54 are hydrodynamically designed for
maintaining their position in faster moving rivers
and streams.
Ekman Samplers
Ponar Type Samplers
Van Veen Samplers
Benthic Sediment Bottom
Samplers
Ekman Bottom Grab Samplers
The Ekman Bottom Grab sampler is designed for
sampling in soft bottomed lakes and rivers composed
of muck, mud or fine peat. As the sampler is
lowered, two hinged upper lids swing open to let
water pass through and close upon retrieval
preventing sample washout. When the sampler reaches
the bottom, a messenger is sent down the line
tripping the overlapping spring-loaded scoops. Each
sampler is constructed of 316 stainless steel
including the springs, cables and fasteners. Also
available is a 5 ft. and 10 ft. extension handle for
operating the sampler in shallow water instead of a
cable and messenger. The sampler is also available
as a kit which includes stainless 300 gm messenger,
100 ft. cable and carrying case (ordered
separately).
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Ponar Type Grab Sampler
The Ponar Type Grab sampler is a
commonly used sampler that is very versatile for all
types of hard bottoms such as sand, gravel and clay.
It can be used in streams, lakes reservoirs and the
ocean. This modified Van Veen type self-tripping
sampler features center hinged jaws and a spring
loaded pin that releases when the sampler makes
impact with the bottom. It also includes an underlip
attachment that cleans gravel from the jaws that
would normally prevent lateral loss of sample. The
top is covered with a stainless steel screen with
neoprene rubber flaps which allows water to flow
through for a controlled descent and less
interference with the sample. It is constructed of
stainless
steel with zinc plated steel arms and weights. A
simple pin prevents premature closing.
The Ponar style sampler comes in several sizes
with the lightweight model (1/8" stainless plate)
easily used from a small boat with nylon cable. The
heavyweight models (1/4" stainless plate) should be
used with a sounding reel.
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Van Veen Grab Sampler
The Van Veen grab is a lightweight sampler
designed to take large samples in soft bottoms. Its
long lever arms and the sharp cutting edges on the
bottom of the scoops, enable it to cut deeply into
the softer bottoms. The Van Veen grab sampler is
manufactured in two sizes from stainless steel. The
weighted jaws, chain suspension, and doors and
screens allow flow-through during lowering to the
bottom and assure vertical descent where strong
underwater currents exist. The relatively large
surface area and the strong closing mechanism allow
the jaws to excavate relatively undisturbed
sediments. When the powering cable is slowly made
taut, the chains attached at the top of the release
exert great tension on the long arms extending
beyond the jaws, causing them to lift, dip deeper
into the sediment, and trap material as they tightly
close. The stainless-steel, 583 micron, door screens
have flexible rubber flaps which, during lowering,
are lifted. When the grab settles on the bottom, the
flaps fall back and cover the screens completely,
preventing any loss of sediment during retrieval.
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Wash Stand
This Wash Stand is designed for use with Eckman,
Ponar, and Van Veen samplers which can be set on top
of the stand cross bars while the sample washes
through the #30 mesh (600µm) stainless wire cloth.
Fine sand and sediments wash out leaving specimens
and larger particles. Made of stainless steel
construction, it measures 14" x 20" x 4".
602-031
Wash Stand 16 lbs.
Sampler Messenger Accessories
603-122
300 gram messenger, stainless steel, solid
603-123
600 gram messenger, stainless steel, solid
603-124
300 gram messenger, stainless steel, split
603-125
Nylon rope, 1/4" diameter, 100 ft.
603-126
Stainless steel aircraft cable, 1/16" diameter, 100
ft.
603-127
Stainless steel aircraft cable, 3/32" diameter, 100
ft.
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