The Dwyer 477AV
Handheld Digital Manometer is available with pressure, flow, and velocity
measurements along with a number of other features. The 477AV uses a highly accurate
differential pressure sensor to offer ± 0.5% full scale accuracy. It displays negative,
positive, and differential pressure. For pressure, flow, and velocity there are
selectable English and metric units, as seen in the model chart below. The
built-in air velocity and volumetric flow calculations conserve time associated
with cumbersome manual calculations. Up to 40 readings can be saved—perfect for
HVAC techs making traverse airflow readings across a duct with a pitot tube.
The accuracy of the 477AV Series is essential for maintenance personnel and
technicians who require a highly accurate standard to check their
instrumentation or equipment against.
digital display is back-lighted for easy viewing in dark areas. Battery conservation is monitored and
displayed in the event of low battery condition. The digital manometer shuts
off automatically after 20 minutes. The shut-off time can be reduced or
disabled if necessary. The Series 477AV can be field-calibrated by setting zero
& span values. The damping feature compensates for the fluctuating readings
by averaging input values to display a more stable readout. The unit features an
audible and visual alarm to warn over flow, over pressure or over velocity.
Displaying Pressure, Velocity, and Flow
measures pressure using a piezoelectric sensor. When the 477AV is powered on
the pressure value and the unit of measurement will be shown. If you select the
velocity or flow mode, then velocity or flow will be displayed instead. The
mode selection will persist even after the instrument is turned off. In
velocity and flow modes, if the reading exceeds 9,999, then a “K” will be
displayed next to the unit of measurement and the display will read in units of
1,000 times the original unit of measurement.
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