Dwyer Instruments - Series 475: 475-3-FM Mk III Handheld Digital
Manometer
Case Sold Separately
• Measures Positive, Negative and Differential Pressures
• Rugged, Extruded Aluminum Case
• Lightweight, Fast and Easy to Use
• Selectable English/Metric Units
• FM Approved
The Dwyer Series 475-FM 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. 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,
the Series 475-FM Mark III can also be used as an air velocity
gage.
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
in. w.c. range is compensated for position sensitivity through the
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, auto zero, and pressure unit
selection. No set-up 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.
Specifications
Service: Air and compatible combustible gases.
Wetted Materials: Call us at (888) 886-8185.
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 Range: English: 0-200.0" w.c., Metric: 49.82
kPa.
Maximum Pressure: 30 psig.
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: 0.42" (10.6 mm) 4 digit LCD.
Resolution: See table below.
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 1/4" (6.35 mm) O.D. tubing for
475-7-FM & 475-8-FM only.
Agency Approvals: FM, CE.
Click
here for Dwyer 475-3-FM Data Sheet 
Click
here for Dwyer 475-3-FM Service Manual
Below are other pressure ranges available for Series 475 Digital
Manometer:
|
Model
Number
|
English
Range
|
Metric
Range
|
Maximum Pressure
|
|
|
0-1.000 in w.c.
|
.2491 kPa
|
5 psig
|
|
|
0-4.000 in w.c.
|
.996 kPa
|
5 psig
|
|
|
0-10.00 in w.c.
|
2.491 kPa
|
5 psig
|
|
|
0-20.00 in w.c.
|
4.982 kPa
|
10 psig
|
|
|
0-40.00 in w.c.
|
9.96 kPa
|
10 psig
|
|
|
0-200.0 in w.c.
|
49.82 kPa
|
30 psig
|
|
|
0-10.00 psi
|
.6895 bar
|
30 psig
|
|
|
0-20.00 psi
|
1.379 bar
|
60 psig
|
|
|
0-30.00 psi
|
2.069 bar
|
60 psig
|
|
|
0-100.0 psi
|
6.895 bar
|
150 psig
|
|
|
0-150.0 psi
|
10.34 bar
|
200 psig
|
