Vertical Transit Rate Pacer - US VTP-99
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The US VTP-99 is a small battery-powered oscillator which
periodically sounds a tone in an earphone. The tone provides a
time-interval reference for pacing the lowering and raising of
suspended-sediment samplers when collecting depth-integrated
samplers. The pacer makes a more uniform vertical rate possible
and therefore insures a more accurate discharge-weighted sample.
The audible signal eliminates the use of a stopwatch and allows
the operator more freedom. The pacer is small enough that it can
be carried in the operator's shirt pocket.
The operator selects the vertical transit rate based on mean
stream velocity and the circumference of the sounding reel from
the tables and instructions included with the pacer.
405-006 US VTP-99 1 lb.
