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. When used with
a Dwyer® Pitot tube (see Air Velocity), the Series 475 Mark
III can also be used as an air velocity gage. See the complete
475-1-FM-AV kit on the "Options/Accessories" page.
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 use of a unique patented
dual sensor system. A standard 9 volt battery provides up
to 100 hours of operation. Dual push pads on the front panel
control on-off operation and English or metric pressure
unit selection. No setup or leveling. Zero adjust knob is
conveniently located on top. The large 1/2" 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.
SPECIFICATIONS
Service: Air and compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±0.5% F.S., 60 to 78°F (15.6 to 25.6°C);
±1.5% F.S. from 32 to 60°F and 78 to 104°F (0 to 15.6°C
and 25.6 to 40°C).
Pressure Hysteresis: ±0.1% of full scale.
Pressure Limits: See chart on "Ordering" page.
Temperature Limits: 0 to 140°F (-17.8 to 60°C).
Compensated Temperature Limits: 32 to 104°F (-0 to
40°C).
Storage Temperature Limits: -4 to 176°F (-20 to 80°C).
Display: 0.5" liquid crystal. 3-1/2 digits.
Resolution: See chart on "Ordering" page.
Power Requirements: 9 volt alkaline battery. Battery
not connected.
Weight: 10.8 oz. (306 g).
Connections: Two barbed connections for use with
1/8" (3.18 mm) or 3/16" (4.76 mm) I.D. tubing. Two compression
fittings for use with 1/8" (3.18 mm) I.D. x 3/16" (4.76
mm) O.D. tubing for 475-7-FM & 475-8-FM only.
Agency Approvals: FM, CE.
FEATURES
- New LOW Range Option
0-1.00 in. w.c.
- Measures Positive, Negative and Differential Pressures
- Rugged, Extruded Aluminum Case
- Lightweight, Fast and Easy to Use
- Dual Calibration with English and Metric Units
- FM Approved
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