Dwyer 673 User Manual

Series 673 Pressure Transmitter

Specifications - Installation and Operating Instructions

Bulletin A-30-673

Conduit Version

The low cost Series 673 Pressure Transmitter is a fixed range

transmitter designed for harsh environments and suitable for high shock
and vibration applications. Constructed of stainless steel, the Series 673
provides a 4-20 mA output signal with 0.25% accuracy. Use the Series
673 in industrial OEM equipment, hydraulic systems, HVAC equipment,
industrial engines and compressor controls.

INSTALLATION
Electrical Connections

The Series 673 Pressure Transmitter is a true 2-wire, 4-20 mA current
output device and delivers rated current into any external load of 0-800
ohms. The transmitter has a two wire cable where red is positive and
black is negative. Connect shield to system or earth ground.
The 4-20 mA current output units are designed to have current flow in
one direction only - please observe polarity. We suggest that the
electrical cable shield be connected to the system’s loop circuit ground
to improve electrical noise rejection.

Media Compatibility

These transmitters are designed to be used with any gas or liquid
compatible with 17-4 PH stainless steel.

Pressure Fitting

Typically, standard pipe fittings and procedures should be used.
However, for pressure ranges in excess of 500 psig, we suggest the use
of a sealant. Excessive torquing of metal fittings may cause a slight zero
shift. The use of plastic fittings typically results in no noticeable zero
shift. Torquing does not appreciably affect linearity or sensitivity.

Ø1-19/32

[40.48]

Ø1-13/32

[35.72]

Ø1-5/8

[41.28]

CONDUIT VERSION

3/4 HEX

[19.05 HEX]

1/4 NPT

2-23/64

[59.93]

2

[50.8]

CABLE ANCHOR

1/4˝-18 (22.3 MM)

CONDUIT KNOCKOUT

ø1-5/8

[41.28]

3/4 HEX

[19.05 HEX]

1/4 NPT

3-5/8

[92.08]

1-11/16

[42.86]

SPECIFICATIONS
Service: Compatible, non-combustible liquid, gas, or vapor.
Wetted Materials: 17-4 PH stainless steel.
Accuracy: RSS* (at constant temperature) ±0.25%.

Non-Linearity: (BFSL) ±0.22% FS;
Hysteresis: 0.10% FS;
Non-Repeatability: 0.05% FS.

Temperature Limits: -40 to 185°F (-40 to 85°C).
Pressure Limits: 2 X full scale range.
Compensated Temperature Range: -40 to 176°F (-40 to 80°C).
Thermal Effects: Zero Shift: ±2.0% FS/100°F (±1.8% FS/50°C); Span

Shift: ±1.5% FS/100°F (±1.3% FS/50°C); Warm-up Shift: ±0.1% FS
total.

Stability: 0.5% FS/year.
Response Time: 5 milliseconds.
Supply Voltage: 9-30 VDC.
Output: 4-20 mA**, 2-wire.
Zero and Span Adjustment: Fixed.
Loop Resistance: 0 to 800Ω.
Shock: 200 g.
Vibration: 20 g.
Electrical Connections: 2 ft (61 cm) multi-conductor cable.
Conduit Models: 1/4˝-18 (22.3 mm) knockout.
Enclosure: Stainless steel and Valox.
Weight: 2.3 oz (65 g).
Agency Approvals: CE.

MAINTENANCE

Upon final installation of the Series 673 Pressure Transmitter, no routine
maintenance is required. A periodic check of system calibration is

*RSS of non-linearity, non-repeatability and hysteresis
**Zero output factory set to within ±0.16 mA.

**Span (full scale) output factory set to within ±0.16 mA.
recommended. The Series 673 is not field serviceable and should be
returned if repair is needed (field repair should not be attempted and
may void warranty). Be sure to include a brief description of the problem
plus any relevant application notes. Contact customer service to receive
a return goods authorization number before shipping.

©Copyright 2010 Dwyer Instruments, Inc. Printed in U.S.A. 12/10 FR# RA-443786-00 Rev. 1

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]