The Dwyer® Series 475 Mark III Handheld Digital Manometer is ideal for field calibration,
monitoring or trouble shooting HVAC systems, clean rooms or a wide range of other low pressure
pneumatic systems. This handy instrument measures positive, negative or differential pressures of air
and natural gases in ranges from 1 in. w.c. (0.249 kPa) to 150 psid (10.34 bar). The Series 475-FM
is approved and is intrinsically safe for hazardous locations, Class 1, Div.1, Group A, B,C, D, T4.
Its simple operation and easy to read digital display make it an indispensable test instrument for the
plant engineer, industrial hygienist and HVAC technician. Order the optional Air Velocity (AV) kit for
air flow measurements.
The Series 475-FM Mark III is housed in a durable extruded aluminum case with its solid state circuitry
mounted on a tough fiberglass epoxy circuit board. To meet the most demanding applications and to
provide stability of instrument reading, the 1" w.c. range is compensated for position sensitivity through
operation. Dual push pads on the front panel control on-off, auto zero, and pressure unit selection.
No setup or leveling. The large 0.42" LCD display is easy to read, minimizing data collection errors.
Units include a "low battery" indicator. The pressure sensor used is a highly stable silicon piezoresistive
device. Standard connections are dual sized for 1/8" or 3/16" I.D. vinyl or rubber tubing.
Complete instructions are conveniently printed on rear of housing.