数字差压计 477AV-3 Dwyer德威尔 差压计
量程：0-40 in wc
The new, upgraded SERIES 477AV HANDHELD DIGITAL MANOMETER is now
available with pressure, flow, and velocity measurements along with a number of other
convenient 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 specifications. The built-in air velocity and flow calculations provide accuracy and
conserve time associated with cumbersome manual calculations. Additionally, up to 40
readings can be saved—perfect for HVAC technicians making Pitot tube traverses of
airflow readings across a duct. The accuracy that the 477AV series provides is critical
to maintenance personnel and technicians who require a highly accurate standard to
check their instrumentation or equipment, to ensure proper performance.
The digital display offers a backlight feature for easier viewing in darker areas.
Meanwhile, battery conservation is monitored and displayed in the event of low battery
voltage. The digital manometer will automatically shut off after 20 minutes to prevent
battery drain. This shut-off time can be reduced or disabled if desired. Series 477AV
can be field-calibrated by setting zero and span values. Furthermore, the damping
feature compensates for the fluctuating readings by averaging input values to display
a more stable readout. Included is an audible and visual alarm to warn over flow, over
pressure or over velocity.
The Series 477AV features a menu structure outline printed on the back of the
aluminum casing. Comprehensive written instructions, a wrist strap, and a 9 Volt
alkaline battery are also included.
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