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User’s Guide
TM
omega.com
®
www.omega.com
e-mail: info@omega.com
DSW490B and DSW790B
Pressure Control Switches
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TM omega.com ® ® OMEGAnet On-Line Service Internet e-mail www.omega.com info@omega.com Servicing North America: USA: One Omega Drive, P.O. Box 4047 ISO 9001 Certified Stamford CT 06907-0047 TEL: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1 TEL: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca For immediate technical or application assistance: ® USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA ® Customer Service: 1-800-6
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INSTALLATION AND MAINTENANCE OF THE DSW490B AND DSW490B SERIES ® OMEGA SNAP ACTION SWITCHES FOR DIFFERENTIAL PRESSURE CONTROL 3 DSW490 series standard – one ⁄4 NPT conduit INTRODUCTION hole right side. The OMEGA differential pressure switch is a precision built U.L. approved control device 3 DSW790 series standard – two ⁄4 NPT conduit which features a mechanical snap action switch. holes with one permanent plug. NEMA 7 & 9 Controllers are available for operation on vari- enclosures require prop
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For accurate setpoint calibration, mount the Note – As indicated above, adjustment of set- 7 switch on a calibration stand, a pump or catalog point is made by use of ⁄8˝ nut. Precision switch Omega DWT 1305 deadweight gauge tester. A element mounting screws and bracket adjusting suitable reference standard such as a Test Gauge screw are factory sealed and should not be is necessary to observe convenient changes in tampered with. pressure. A typical calibration procedure would be as follows: TER
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CO R . CO R . E E E E LE M LE M IC IC R R V V E E R R R R F F PE PE E E U U S S EN EN O O N N I I C C E E B B E E R. R. N N R R I I O O T T VR VR TI TI T T U U U E U E ’O ’ O A A D M D M C C . . E G E G S S N N FF O FF O I I L L O T O T F N C F N C A A O R . R O R . R G G N U E N U E IO T N P IO T N P IT E I IT E I DIFFERENTIAL PRESSURE SWITCH – DIFFERENTIAL PRESSURE SWITCH – PSID INCHES OF WATER A D Ø 0.28 B Ø 0.28 (3 Holes) (3 Holes) C E A D H 1/4 NPT 3/4 NPT Female F C 3/4 NPT H G 1/4 NPT 1/4
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MADE IN WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Depa
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Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors Infrared Pyrometers PRESSURE, STRAIN AND FORCE Transducers & Strain Gages Load Cells & Pressure Gages Displacement Transducers Instrumentation & Accessories FLOW/LEVEL Rotam
