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STREAM
GAGING INSTRUMENTS |
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Sounding Weights
Sounding weights are used in
streams where discharge measurements are made by suspension
techniques from bridges, cableways or boats. The sounding weight is
suspended below the current meter to keep it stationary in the
water. The USGS Columbus-type or "C"-type weights are streamlined to
minimize resistance to flowing water and are longer than the current
meter, thereby offering some protection from bridge piers and
flowing debris. The added length also produces better directional
and stabilizing characteristics than that obtained with other
weights. The hanger slot is shaped to allow the hanger to tilt
forward 15 degrees and backward 5 degrees from the vertical. This
prevents the meter from coming into contact with, and being damaged
by, the weight. These weights come in 15, 30, 50, 75, 100, 150, 200
and 300-pound (7, 14, 23, 34, 45, 68, 91 and 136 kg) sizes. The
15-pound (7 kg) weight is cast from brass, but all others are cast
from lead and have aluminum tailfins. All are properly balanced and
tested by an approved method before shipment. The weights can be
epoxy coated if required.
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Stainless steel hanger bars and
pins are used to attach the weight to a standard Type AA or
universal current meter and sounding reel. The regular hanger bar is
12 inches (30 cm) long and can be used for 15-pound through
100-pound (7 kg through 45 kg) weights. The 18" hanger bar is
designed for the 150 lbs. (68 kg) weight. The heavy bar is used for
200 and 300-pound (90 and 136-kilogram) weights and is 18 inches (45
cm) long. The holes drilled in the hanger bar are marked for proper
placement of the current meter for the different sized weights. The
pins are threaded into the bar through the hole in the weight, and
are made in different lengths for each different size weight.
Sounding weight, hanger bar, and hanger pin are sold separately.
|
Item No. |
Sounding
Weight |
Shipping
Weight |
|
108-001 |
15 lbs. (7 kg) |
18 lbs. |
|
108-003 |
30 lbs. (14 kg) |
34 lbs. |
|
108-005 |
50 lbs. (23 kg) |
56 lbs. |
|
108-007 |
75 lbs. (34 kg) |
95 lbs. |
|
108-009 |
100 lbs. (45 kg) |
125 lbs. |
|
108-011 |
150 lbs. (68 kg) |
185 lbs. |
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108-013 |
200 lbs. (91 kg) |
235 lbs. |
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108-015 |
300 lbs. (136 kg) |
345 lbs. |
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Weight racks are intended to be
securely bolted to the floor of field vehicles as a safe means of
carrying sounding weights. The racks are made of heavy steel, with
outside dimensions of 4 inches high, 18 inches long, and 11 inches
wide, and have welded brackets to hold Columbus sounding weights.
The weight racks are available in two sizes as listed.
|
Item No. |
Description |
Weight |
|
108-040 |
30 and 100 lb. Weight Carrier |
22 lbs. |
|
108-041 |
50 and 75 lb. Weight Carrier |
22 lbs. |
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