Series 668 Differential Pressure Transmitter

Ranges from 0 to 100" w.c., Overpressure Protection to 10 psig, ±1% Accuracy

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 flow 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.

Calibration Option available under Accessories.

Product Applications

Variable air volume systems
HVAC
Building management

Starting at $240.10

Ordering

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Bi-Directional Ranges

Bi-Directional Ranges with Conduit Cover

Standard Ranges

Standard Ranges with Conduit Cover

Grouped product items
Model	Description	Availability*	Price
668-1	Differential pressure transmitter, range 0-0.25" w.c.	1-3 days*	$240.10
668-10	Differential pressure transmitter, bi-directional, range 0 to ±0.1" w.c.	1-3 days*	$240.10
668-11	Differential pressure transmitter, bi-directional, range 0 to ±0.25" w.c.	3-4 Weeks*	$240.10
668-12	Differential pressure transmitter, bi-directional, range 0 to ±0.5" w.c.	3-4 Weeks*	$240.10
668-13	Differential pressure transmitter, bi-directional, range 0 to ±1" w.c.	4-5 Weeks*	$240.10
668-14	Differential pressure transmitter, bi-directional, range 0 to ±2.5" w.c.	4-5 Weeks*	$240.10
668-15	Differential pressure transmitter, bi-directional, range 0 to ±5" w.c.	4-5 Weeks*	$240.10
668-16	Differential pressure transmitter, bi-directional, range 0 to ±10" w.c.	3-4 Weeks*	$240.10
668-17	Differential pressure transmitter, bi-directional, range 0 to ±25" w.c.	3-4 Weeks*	$240.10
668-18	Differential pressure transmitter, bi-directional, range 0 to ±50" w.c.	3-4 Weeks*	$240.10
668-19	Differential pressure transmitter, range 0-0.4" w.c.	1-3 days*	$240.10
668-2	Differential pressure transmitter, range 0-0.5" w.c.	1-3 days*	$240.10
668-20	Differential pressure transmitter, bi-directional, range -0.05 to .20" w.c.	3-4 Weeks*	$240.10
668-3	Differential pressure transmitter, range 0-1.0" w.c.	1-3 days*	$240.10
668-4	Differential pressure transmitter, range 0-2.5" w.c.	7-8 Weeks*	$240.10
668-5	Differential pressure transmitter, range 0-5.0" w.c.	1-3 days*	$240.10
668-6	Differential pressure transmitter, range 0-10" w.c.	1-3 days*	$240.10
668-7	Differential pressure transmitter, range 0-25" w.c.	1-3 days*	$240.10
668-8	Differential pressure transmitter, range 0-50" w.c.	1-3 days*	$240.10
668-9	Differential pressure transmitter, range 0-100" w.c.	4-5 Weeks*	$240.10
668C-1	Differential pressure transmitter with conduit cover, range 0-0.25" w.c.	3-4 Weeks*	$269.85
668C-10	Differential pressure transmitter with conduit cover, range 0 to ±0.1" w.c.	3-4 Weeks*	$269.85
668C-11	Differential pressure transmitter with conduit cover, range 0 to ±0.25" w.c.	3-4 Weeks*	$269.85
668C-12	Differential pressure transmitter with conduit cover, range 0 to ±0.5" w.c.	3-4 Weeks*	$269.85
668C-14	Differential pressure transmitter with conduit cover, range 0 to ±2.5" w.c.	4-5 Weeks*	$269.85
668C-15	Differential pressure transmitter with conduit cover, range 0 to ±5" w.c.	3-4 Weeks*	$269.85
668C-16	Differential pressure transmitter with conduit cover, range 0 to ±10" w.c.	3-4 Weeks*	$269.85
668C-17	Differential pressure transmitter with conduit cover, range 0 to ±25" w.c.	3-4 Weeks*	$269.85
668C-18	Differential pressure transmitter with conduit cover, range 0 to ±50" w.c.	7-8 Weeks*	$269.85
668C-2	Differential pressure transmitter with conduit cover, range 0-0.5" w.c.	3-4 Weeks*	$269.85
668C-3	Differential pressure transmitter with conduit cover, range 0-1.0" w.c.	3-4 Weeks*	$269.85
668C-4	Differential pressure transmitter with conduit cover, range 0-2.5" w.c.	3-4 Weeks*	$269.85
668C-5	Differential pressure transmitter with conduit cover, range 0-5.0" w.c.	3-4 Weeks*	$269.85
668C-6	Differential pressure transmitter with conduit cover, range 0-10" w.c.	3-4 Weeks*	$269.85
668C-7	Differential pressure transmitter with conduit cover, range 0-25" w.c.	3-4 Weeks*	$269.85
668C-8	Differential pressure transmitter with conduit cover, range 0-50" w.c.	3-4 Weeks*	$269.85
668C-9	Differential pressure transmitter with conduit cover, range 0-100" w.c.	3-4 Weeks*	$269.85

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°C), 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:: ±1 mA, non-interactive.
Response Time:: <60 msec.
Loop Resistance:: 0 to 800 Ω.
Electrical Connection:: Terminal strip.
Pressure Connection:: 3/16" OD fitting for 1/4" ID tubing.
Housing:: Fire retardant glass filled polyester.
Weight:: 3 oz (85 g).
Agency Approval:: CE.

Features

Good accuracy at low pressure ranges provides exceptional value for ensuring control and minimizing costly out of specification conditions
High overpressure rating eliminates possible damage to unit reducing unnecessary service time

Support Library

Manuals

Instruction Manual

Catalog Pages

Series 668 Catalog Page

Product Data Sheet

Approvals

CE Approval

Drawings

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Accessories

Model	Description	Availability*	Price
A-489	4" 303 SS straight static pressure tip with flange, 1/4" hose barb.	1-3 days*	$9.50
A-302F-A	303 SS Static pressure tip with mounting flange, for 3/16" I.D. rubber or plastic tubing. 4" insertion depth, includes mounting screws	1-3 days*	$12.40