Dwyer Instruments 647 Specifications

[4] 1/4 [6.35] LONG X 7/32 [5.56]

CONNECTION

1/8 FEMALE NPT
LOW PRESSURE

5 [127.00]

®

SERIES 647

WET/WET DIFFERENTIAL PRESSURE TRANSMITTER

Ranges from 1 to 25 in w.c., ±1.0% Accuracy, NEMA 4 (IP56) Enclosure, 2-Wire

PRESSURE

Monitor differential pressure in air/liquid ow systems, HVAC automation, pneumatic
systems and process control with the SERIES 647 Wet/Wet Differential Pressure
Transmitter. Units are temperature compensated and provide a 4 to 20 mA output
signal which can be interfaced with chart recorders, data loggers and computerized
monitoring and control systems.

FEATURES/BENEFITS

• Versatile for liquid or gas supports designs requiring more precise measurements in
support of application

• Temperature compensated improves performance of device for accurate
measurement under different operating environments.

• Output signal provides capability to interface with automation systems to centralize
monitoring

APPLICATIONS

• Flow • HVAC automation

• Process control • Pneumatic systems

MODEL CHART
Model Range Model Range
647-0

0 to 1 in w.c.

647-1

0 to 3 in w.c.

647-2

0 to 25 in w.c.

647-3
647-4

0 to 5 in w.c.
0 to 10 in w.c.

WIDE MOUNTING HOLES

3-5/16
[84.15]

5-9/16

[141.30]

2-1/2

[63.50]

1-17/64

[32.15]

Ø7/8 [22.23]

CONDUIT

1-1/16 [26.97] TYP

1-1/8

[28.58]

HIGH PRESSURE CONNECTION

SPECIFICATIONS
Service: Compatible gases or liquids on

both pressure and reference sides.
Wetted Materials: Brass, vinyl, glass­lled polyester, silicon, and uorosilicone.

Accuracy: ±1.0% FS.
Stability: ±1.5% FS output/year.
Temperature Limits: 32 to 122°F (0 to

50°C).
Pressure Limits: Ranges 1 in w.c. to 5
psi: 20 psi, 15 psi range: 45 psi, 30 psi
range: 60 psi.
Thermal Effects: Zero: ±0.05% FS/°F,
Span: ±0.05% rdg/°F.

OPTIONS
Use order code: Description
NISTCAL-PT1 NIST traceable calibration certicate

USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

1/8 FEMALE NPT

2-7/8

[73.03]

2-15/16

[74.63]

Power Requirements: 18 to 30 VDC.
Output Signal: 4 to 20 mA, 2-wire.
Zero and Span Adjustments:

Adjustable, ±10%.
Loop Resistance: 400Ω @ 18 VDC,
600Ω @ 24 VDC, 1000Ω @ 30 VDC.
Electrical Connection: Screw terminals,
reverse polarity protected.
Process Connections: Two 1/8˝ female
NPT.
Housing: Gasketed steel epoxy painted,
NEMA 4 (IP56).
Weight: 14 oz (397 g).

CONNECTION