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Mercoid div. of Dwyer Instruments Inc.

Series 123/125 Boiler Water Level Control


123/125 Series
  • Direct Action
  • Mercury  or Snap Switch Contacts
  • UL and CSA listed
  • Ideal replacement for the discontinued 75 series level switches

  •   Designed for boiler applications, the Model 123 is primarily used for low water cut-off or feed-water control. Other applications include condensate tanks and deaerators. A special snap action switch mechanism eliminates frequent operation due to surging water level. A transparent cover provides convenient visible operation of the switch. Features a flanged chamber for easy clean out and replacement of float or switch mechanism without removing the unit from piping. The 125 offers the same long lasting service with a direct action mercury switch movement that provides a close deadband where needed.

    Specifications


    Dimensional Drawing

    123/125 Dimensions

    Model 123/125 Part Number Configuration Charts

    123 Series
    123
    123XLW
    123WP
    123RU
    123RUSST
    123RL
    123RLSST
    123RUXLW
    123SST
    123XLS
    123SSTWP


    Single Stage, Automatic Reset, Brass Trim, Nema1
    Replacement Float, Cap and Switch Assembly Only, No Chamber for 123
    Single Stage, Automatic Reset, Brass Trim, Weatherproof Housing
    Single Stage, Manual Reset, Brass Trim, Nema1
    Single Stage, Manual Reset, Stainless Steel Trim, Nema1
    Single Stage, Manual Reset, Brass Trim, Nema1
    Single Stage, Manual Reset, Stainless Steel Trim, Nema1
    Replacement Float Cap and Switch Assembly Only, No Chamber 123RU
    Single Stage, Automatic Reset, Stainless Steel Trim, Nema1
    Replacement Switch Assembly Only
    Single Stage, Automatic Reset, Stainless Steel Trim, Weatherproof Housing
    Circuits

    2
    3
    153
    156
    804
    7000-153
    SPST mercury switch, closes on level increase
    SPST mercury switch, opens on level increase
    SPDT mercury switch
    2 SPST mercury switches, electrically independant. One switch opens as the other closes.
    2 SPDT mercury switches
    SPDT snap switch


    125 Series
    125
    125XLW
    125WP
    125SST
    125XLS
    125SSTWP


    Two Stage, Automatic Reset, Brass Trim, NEMA1
    Replacement Float, Cap and Switch Assembly Only. No Chamber for 125
    Two Stage, Automatic Reset, Brass Trim, Weatherproof Housing
    Two Stage, Automatic Reset, Stainless Steel Trim, Nema1
    Replacement Switch Assembly Only for 125

    Two Stage, Automatic Reset, SST Trim, Weatherproof Housing

    Circuits

    4820


    4821



    4810



    4815


    4806

    SPST mercury switch close on level fall, rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC, motor rating 1 hp 120 VAC, 3/4 hp 240 VAC, 1/3 hp 120/240 VDC.

    SPST mercury switch open on level fall, rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC, motor rating 1 hp 120 VAC, 3/4 hp 240 VAC, 1/3 hp 120/240 VDC.


    SPDT mercury switch, one circuit closes as one circuit opens, rated 4 amp 120 VAC/DC, common ground.


    SPDT, consisting of two SPST mercury switches, electrically independent, one circuit closes as one circuit opens, each switch rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC.


    DPDT, consisting of two SPDT mercury switches, each switch has common ground, two circuits close as two circuits open, each switch rated 4 amp 120VAC/DC, 2 amp 240 VAC/DC.


    * Cast iron chamber is not for use with lethal or flammable substances, either liquid or gaseous.



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    Sherman Instruments
    John Sherman Agencies Ltd.
    1641 Venables Street
    Vancouver, British Columbia, Canada
    V5L 2H1

    Phone: 604-254-9622
    Fax: 604-254-3123

    e-mail: info@johnsherman.com
     
     
     
     

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