1900 DWYER | Alldatasheet

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Technical content

49 Differential Pressure Switches PRESSURE

DWYER INSTRUMENTS, LLC | dwyer-inst.com COMPACT LOW DIFFERENTIAL PRESSURE SWITCHES Set Points from 0.07 to 20 in w.c. Repetitive Accuracy within 3% Our most popular Series 1900 Compact Low Differential Pressure Switches combine advanced design and precision construction to make these switches able to perform many of the tasks of larger, costlier units. Designed for air conditioning service, they also serve many fluidics, refrigeration, oven and dryer applications. adjustment is easy with range screw located inside conduit enclosure. Internal location helps prevent tampering. UL, CE and CSA listed, and FM approved. For use with air or compatible gages. BENEFITS/FEATURES

  • Compact size and repeatability, provides a high-value switch for many industrial and OEM applications 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 [16.27] 1-19/32 [40.48] 2-11/32 [59.53] Ø7/8 [22.23] CONDUIT CONNECTION 1-3/4 [44.45] CLEARANCE FOR COVER REMOVAL [76.20] Ø3-1/2 [88.90] 60° TYP 1/8 FEMALE NPT HIGH PRESS. CONNECTION 1-5/16 [33.32] TYP 2-7/16 [61.90] 2-9/32 [57.94] 1-7/8 [47.63] (2) Ø3/16 [4.76] MOUNTING HOLES 1/8 FEMALE NPT LOW PRESSURE CONNECTION [20.24] SPECIFICATIONS Service: Air and non-combustible, compatible gases. Wetted Materials: Consult factory. Temperature Limits: -30 to 180°F (-34 to 82.2°C). Switch Type: Single-pole double-throw (SPDT). Repeatability: ±3%. Electrical Rating: 15 A @ 120-480 VAC, 60 Hz. Resistive 1/8 HP @125 VAC, 1/4 HP @ 250 VAC, 60 Hz. Derate to 10 A for operation at high cycle rates. Electrical Connections: 3 screw type, common, normally open and normally closed. Process Connections: 1/8˝ female NPT. Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations. Set Point Adjustment: Screw type inside conduit enclosure. Weight: 1 lb 4.5 oz (581 g). Compliance: CE, CSA, FM, and UL. Optional-EXPL explosion-proof enclosure does not possess any compliance. Series 1910 switch with conduit enclosure off. Shows electric switch and set point adjustment screw located on same side for easy installation. Process Tubing Options: See page 453 (Gage Tubing Accessories) The Dwyer-engineered force-motion amplifier increases the leverage of diaphragm movement and results in a switch with excellent sensitivity and repeatability. Manual reset option SERIES 1900 VVIIDDEEOO OONNLLIINNEE OPTIONS Weatherproof Housing 16 ga. steel enclosure with gasketed cover (NEMA 4, IP66) for wet or oily be factory installed. Note: To order, change 1910 base number to 1911, add -WP suffix. Example: 1911-1-WP Explosion-Proof Housing Cast iron base with brass cover. Rated Class I, Groups D; Class II, Div. 2, Groups E, F, G; Class III and NEMA 7, 9 NEMA 3. (7 lb). Switch must be factory installed. Note: To order, change 1910 base number to 1911, add -EXPL suffix. Example: 1911-1-EXPL Manual Reset Option (Model 1900 MR) Includes special snap switch which latches on pressure increase above the setpoint. Switch must be manually reset after pressure drops below the setpoint. Available on -1, -5,-10 or -20 ranges only. Option is not UL, CSA or FM listed. For use only in single positive pressure applications. Note: To order, change 1910 base number to 1900, add -MR suffix. Example: 1900-10-MR MODEL CHART Model Operating Range in w.c. Approximate Deadband At Min. Set Point At Max. Set Point 1910-00 1910-0 1910-1 1910-5 1910-10 1910-20 0.07 to 0.15 0.15 to 0.5 0.40 to 1.6 1.40 to 5.5 3.0 to 11.75 4.0 to 20.0 0.04 0.10 0.15 0.30 0.40 0.40 0.04 0.10 0.16 0.30 0.40 0.50 ACCESSORIES Model Description A-302F-A A-329 A-399 A-489

303 SS static pressure tip with mounting flange; for 3/16˝ ID rubber or

plastic tubing; 4˝ insertion depth; includes mounting screws Street ell; brass adaptor for applications requiring right angle connections; two required for differential pressures Duct pressure monitor kit; for use with standard or manual reset model switches; includes mounting flange, tubing and adapters 4˝ straight static pressure tip with flange USA: California Proposition 65 WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.