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    Series 1900 Compact Low Differential Pressure Switches

    Compact Low Differential Pressure Switch
    Set Points from 0.07" to 20" w.c., Repetitive Accuracy within 3%

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    Series 1900 Compact Low Differential Pressure Switches

    Set Points from 0.07" to 20" w.c., Repetitive Accuracy within 3%

    Our most popular SERIES 1900 combines 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. For air and non-combustible compatible gases, Series 1900 switches have set points from 0.07 to 20" w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside conduit enclosure. Internal location helps prevent tampering. UL, CE and CSA listed, and FM approved.

    CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.

    Please see SERIES AT11910 for ATEX approved.

    Product Applications

    • Air conditioning refrigeration coil icing detection; defrost cycle intiation.
    • Clogged filter detection.
    • Variable air volume controller.
    More Information
    Model Chart
    EXAMPLE 1910 00 AT Series 1910-00-AT Compact Low Differential Pressure Switch with Conduit, range 0.07-0.15" w.c., with aluminum tag.
    SERIES 1900
    1910
    1911
    1920
    1921    		     Compact Low Differential Pressure Switch
    Compact Low Differential Pressure Switch with Conduit
    Compact Low Differential Pressure Switch without Conduit
    Compact Low Differential Pressure Switch with Conduit and HP Back Port
    Compact Low Differential Pressure Switch without Conduit, with HP Back Port
    RANGE   00
    0
    1
    5
    10
    20    		   0.07-0.15" w.c.
    0.15-0.55" w.c.
    0.4-1.6" w.c.
    1.4-5.5" w.c.
    3.0-11.0" w.c.
    4.0-20.0" w.c.
    OPTIONS     AT
    B
    BGAP
    DPK
    EXPL
    G
    LC
    MIL
    MR
    P
    PRESET
    ST
    TC
    V
    VIT
    WP    		 Aluminum Tag
    Buna-N Diaphragm & O-rings
    B-Gap Micro Switch
    Duct Pressure Kit
    Cast Iron Explosion-proof Housing
    Gold Contact Switch
    Less Conduit
    MIL Switch
    Manual Reset
    L-Bracket Mounting
    Preset
    Stainless Steel Tag
    Tropicalization Coating
    Vent Option
    Fluoroelastomer Diaphragm & O-rings
    Weatherproof Housing
    Options
    • Weatherproof Housing - 16 ga. steel enclosure with gasketed cover (NEMA 4, IP66) for wet or oily conditions. Withstands 200 hour salt spray test. Wt. 5 lbs (2.3 kg). Switch must be factory installed. Change 1910 base number to 1911 and add –WP suffix. Example: 1911-1-WP.
    • Explosion-proof Housing - Cast iron base with brass cover. Rated Class I, Group D; Class II, Groups E, F, G. (7 lbs). Switch must be factory installed. Change model number to 1911 and add –EXPL suffix. Example: 1911-1-EXPL.
    • Manual Reset 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. To order change base model to 1900 and add MR suffix after range number. Example: 1900-10-MR. Available on -1, -5, -10 or -20 ranges only. Option is not UL, CSA or FM listed. NOTE: Manual Reset (MR) option for use only in single positive pressure applications.
    Service: Air and non-combustible, compatible gases.
    Wetted Materials: Consult factory.
    Temperature Limits: -30 to 180°F (-34 to 82.2°C).
    Pressure Limits: 45" w.c. (11.2 kPa) continuous, 10 psig (68.95 kPa) surge.
    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).
    Agency Approvals: CE, CSA, FM, UL. Optional EXPL Explosion-proof enclosure does not possess any agency approvals.
    • 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