Series 668, DWYER,Differential Pressure Transmitter
FEATURES/BENEFITS
• 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
APPLICATIONS
• Variable air volume systems • Building management • HVAC
Series 677B, DWYER, Differential Pressure Transmitter
FEATURES/BENEFITS
• NEMA 4 housing enables a range of use outdoor or indoor where water is present
• High accuracy at low pressure ranges provides exceptional measurement for
insuring tight-control and minimizing costly out of specification conditions
• Use with unregulated DC power permits easy access to electrical supply reducing
costly power conditioning and wiring
APPLICATIONS
• Building energy management • Lab and fume hood control
• Environmental pollution control • Variable air volume
Series 616KD, DWYER, Differential Pressure Transmitter
FEATURES AND BENEFITS
• Simple calibration push-button sets back zero and span, saving time installing and
over the service life
• Cost effective and compact device suitable for OEM applications where space,
simplicity, and value are key
• Ranges and accuracy selection cover a wide range of applications minimizing
components and determining standardizing on design
• Optional 1/8˝ NPT process connection allows for use with metal barbed fittings or
compression fittings for use with metal tubing
APPLICATIONS
• Air handlers • Duct pressure
• Variable air volume • Filter monitoring
Series DP Double Bellows Differential Pressure Switch
FEATURES/BENEFITS
• Bellows switch design provides sensitivity to pressure changes but resists vibration
preventing out of range switching
• External access to set and rest controls makes for easy adjustments
• Visible set point indicators simplify changes
APPLICATIONS
• Accurate switch triggers in high pressure applications
Series DX Wet/Wet Differential Pressure Switch
FEATURES/BENEFITS
• Differential pressure switch that is suitable for most gas and water-based applications
allows multiple uses in the most sophisticated designs
• Weatherproof housing provides protection in the harsh, wet or dirty environments
ensuring switch’s long-service life
• Removable terminal block reduces installation time
APPLICATIONS
• Indicating filter differential pressure • Proving flow through a chiller
• Proof of flow indicator monitoring • Proving flow through a heat pump or AC unit
• Proving flow through a pump
Series H3 Explosion-Proof Differential Pressure Switches
FEATURES/BENEFITS
• Rotary motion design prevents set point shifts
• Explosion-proof housing for use in applications where protection of process and
personnel is needed
• Option for use with water and water-based solution makes this a versatile switch
APPLICATIONS
• Water flow proving with an orifice plate
• Differential pressure across chiller
• Liquid filter status
Series 1950G Explosion-proof Differential Pressure Switch
FEATURES/BENEFITS
• Compatible with natural gas making it suitable for use in those applications
• External set point screw provides easy access that simplifies
making adjustments without opening or disassembling enclosure
• Easily accessible electrical connection simplifies the installation
APPLICATIONS
• Natural gas applications
• Process applications
• All-weather applications
Series 1950 Explosion-proof Differential Pressure Switch
FEATURES/BENEFITS
• Explosion-proof and weatherproof housing provides device protection for outdoor
use or harsh environment operation
• External set point screw provides easy access that simplifies making adjustments
without opening or disassembling enclosure
• Easily accessible electrical connection simplifies the installation
APPLICATIONS
• HVAC applications • Process applications • All-weather applications
Series PG Gas Pressure/Differential Pressure Switch
FEATURES/BENEFITS
• Clear easy-to-read scale and external set point adjustment simplifies operation and
trouble shooting
• Large diaphragm provides accuracy for precise control
• Multiple switching options meet the design of applications
APPLICATIONS
• Natural, manufactured or LP gas applications
Series 1996 Gas Pressure Switch
FEATURES/BENEFITS
• Visible set point and on-off indicator simplifies operation and trouble shooting
• Compact size and low cost make it ideal for gas fired or gas equipment OEM
applications
APPLICATIONS
• Gas furnaces • Natural, manufactured or LP gas applications
Series 1620 Single and Dual Pressure Switch
FEATURES/BENEFITS
• Single or dual action switches support consistent designs with similar models, but
with the ability to match specific application needs
• Sealed diaphragm provides leak-proof construction for high accuracy and precision
control
APPLICATIONS
• Damper positioning • Duct air control
Series 1640 Floating Contact Null Switch for High and Low Actuation
FEATURES/BENEFITS
• Floating “null” switch supports applications requiring two set point actions such as
open and close damper control
• Visible set point indicator simplifies operation and trouble shooting
• Large diaphragm provides low range accuracy providing precise control
APPLICATIONS
• Damper positioning
• Duct air control
Series 1831 DPDT Low Differential Pressure Switches
FEATURES/BENEFITS
• No power to operate DPDT switch means no additional wiring or conduit reduces
material and installation labor costs
• Easy access for modifying set point simplifies adjustment
• Both control contacts activate at the same time eliminating system issues where lead
switch activities prevent the lagging switch from sending a signal
APPLICATIONS
• High duct static cutout applications • HVAC
Series MDS Miniature Pressure Switch
FEATURES/BENEFITS
• Low cost, long service life and fast response time is suitable for a wide range of OEM
uses
• Lightweight but shock and vibration resistant for tough applications
• Gold contacts help ensure a clean connection without dirt or oxidation
APPLICATIONS
• Air proving • Cleaning and purification
• Ventilation flow • Heavy equipment and machinery
• Pressure monitoring • Exhaust ducts
Series AT11910 ATEX Approved 1910 Differential Pressure Switch
FEATURES/BENEFITS
• Flame-proof ATEX enclosure protects the device in hazardous areas
• Compact size and repeatability, provides a high-value switch for many industrial and
OEM applications
• Wide range of models from 0.07 in w.c. to 20 in w.c. can meet exacting OEM
specifications for a low pressure switch
• Range screw protected inside switch enclosure prevents tampering
APPLICATIONS
• Hazardous area low pressure applications
• Air conditioning refrigeration coil icing detection; defrost cycle initiation
• Clogged filter detection
• Variable air volume controller
Series 1900 Compact Low Differential Pressure Switches
FEATURES/BENEFITS
• Compact size and repeatability, provides a high-value switch for many industrial and
OEM applications
• Wide range of models from 0.07 in w.c. to 20 in w.c. can meet exacting OEM
specifications for a low pressure switch
• Range screw protected inside enclosure provides simplifies making adjustments but
prevents tampering
APPLICATIONS
• Air conditioning refrigeration coil icing detection; defrost cycle initiation
• Clogged filter detection
• Variable air volume controller
