Dwyer Instruments 668 Specifications
SERIES 668 | COMPACT DIFFERENTIAL PRESSURE TRANSMITTER
®
FEATURES/BENEFITS
• Good accuracy at low pressure ranges provides exceptional value for ensuring control and minimizing costly out of
specicationconditions
• High overpressure rating eliminates possible damage to unit reducing unnecessary service time
DESCRIPTIONAPPLICATIONS
• Variable air volume systems
• HVAC
• Building management
Our low cost Series 668 Differential Pressure Transmitter is capable
of measuring low pressures with a ±1% accuracy - ideally suited for
proper building pressurization and air ow control. Transmitters can
withstand up to 10 psig overpressure with no damage to the unit. Variable
capacitance sensor design provides excellent sensitivity and long-term
stability. Compact, lightweight design makes installation simple and easy.
Units also feature reverse-polarity protection.
SPECIFICATIONS
Service Air and non-conductive gases.
Accuracy ±1% FS (RSS), (includes non-linearity, hysteresis, and non-repeatability).
Temperature Limits Operating: 0 to 150°F (-18 to 65°), Storage: -40 to 185°F (-40 to 85°C).
Pressure Limits 10 psig (0.69 bar).
Compensated Temperature Range 0 to 150°F (-18 to 65°C).
Thermal Effects 0.033% FS/°F (0.18% FS/°C).
Supply Voltage 12 to 30 VDC.
Output 4 to 20 mA, 2-wire.
Zero and Span Adjustment ± mA, non-interactive.
Response Time <60 msec.
Loop Resistance 0 to 800 Ω.
Electrical Connection Terminal strip.
Pressure Connection 3/16˝ OD tting for 1/4˝ ID tubing.
Housing Fire retardant glass lled polyester.
Weight 3 oz (85 g).
Agency Approval CE.
DIMENSIONS WIRING DIAGRAM
Ø5/32 [3.97] MOUNTING HOLE
TYP 2 PLACES
3/16 [4.76]
3-1/2
[88.90]
1
[25.40]
6-32 SCREW
1-41/64
[41.67]
FITTING
W/TERMINAL
WASHER
2-3/4
[69.85]
3/8
[9.53]
3-5/32
[80.16]
1-7/8
[47.63]
POWER
SUPPLY
12 - 30 VDC
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+
HOW TO ORDER
Use the bold characters from the chart below to construct a product code.
668 -10 -NISTCAL-PT1
RECEIVER LOAD
+
COMOUT EXC
_
LOW
+
HIGH
SERIES
668: Compact differential pressure transmitter
668C: Compact differential pressure transmitter with conduit cover
RANGE
Standard
-1: 0 to 0.25 in w.c.
-2: 0 to 0.5 in w.c.
-3: 0 to 1 in w.c.
-4: 0 to 2.5 in w.c.
-5: 0 to 5.0 in w.c.
-6: 0 to 10 in w.c.
-7: 0 to 25 in w.c.
-8: 0 to 50 in w.c.
-9: 0 to 100 in w.c.
-19: 0 to 0.4 in w.c.
Bi-Directional
-10: 0 to ±0.1 in w.c.
-11: 0 to ±0.25 in w.c.
-12: 0 to ±0.5 in w.c.
-13: 0 to ±1 in w.c.
-14: 0 to ±2.5 in w.c.
-15: 0 to ±5 in w.c.
-16: 0 to ±10 in w.c.
-17: 0 to ±25 in w.c.
-18: 0 to ±50 in w.c.
-20: -0.05 to 0.20 in w.c.
ACCESSORIES
Model Description
A-489
A-302F-A
4˝ straight static pressure tip with ange
303 SS static pressure tip with mounting ange; r 3/16˝ ID rubber or plastic tubing; 4˝ insertion depth; includes mounting screws
OPTIONS
-NISTCAL-PT1: NIST traceable calibration certicate
ORDER ONLINE TODAY!
dwyer-inst.com/Product/Series668
©Copyright 2019 Dwyer Instruments, Inc.
Printed in U.S.A. 5/19 DS-668 Rev. 1
Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the
latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
DWYER INSTRUMENTS, INC.
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