Series 123/125 Boiler Water Level Control

Boiler Water Level Control Heavy Duty, Cast Iron Chamber

Heavy Duty, Cast Iron Chamber

The SERIES 123 & 125 Boiler Water Level Controls are designed for boiler applications, the 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.

Product Applications

  • Boiler Low Water Cut-Off
  • Boiler Feed-Water Control
  • Condensate Tanks
  • Deaerators
More Information
Model Chart
EXAMPLE1232 123-2 Liquid Level Control with SPST mercury switch closing on level increase, minimum specific gravity 0.88, cast iron body, general purpose case, switch rated at 10 amp 120 VAC/DC, 5 amp 24 VAC/DC, pressure rating 150 psi (10 bar), maximum process temperature 365°F (185°C).
CONNECTION123  Single Stage, Automatic Reset, Brass Trim, NEMA 1
123XLW  Replacement Float, Cap, and Switch Assembly Only, No chamber for 123
123WP  Single Stage, Automatic Reset, Brass Trim, NEMA 1
123RU  Single Stage, Manual Reset, Brass Trim, NEMA 1
123RUSST  Single Stage, Manual Reset, SST Trim, NEMA 1
123RL  Single Stage, Manual Reset, Brass Trim, NEMA 1
123RLSST  Single Stage, Manual Reset, SST Trim, NEMA 1
123RUXLW  Replacement Float, Cap, and Switch Assembly Only, No chamber for 123RU
123RLXLW  Replacement Float, Cap, and Switch Assembly Only, No chamber for 123 RL
123SST  Single Stage, Automatic Reset, SST Trim, NEMA 1
123XLS  Replacement Switch Assembly Only for 123
123SSTWP  Single Stage, Automatic Reset, SST Trim, Weatherproof Housing
CIRCUITS 2 9-51 NC SPST Mercury Switch
 3 9-51 NO SPST Mercury Switch
 103 (2) 9-51 NO DPST Mercury Switch
 127 (2) 9-51 NO DPST Mercury Switch
 151V (2) 9-35  4-wire SPST Vibration Dampened Mercury Switch
 152 9-62  4-wire SPST Mercury Switch
 153 9-64  3-wire SPDT Mercury Switch
 156 (2) 9-51  4-wire SPST Mercury Switch
 160 9-61 NO SPST & 9-51 NC 4-wire SPST Mercury Switch
 162 9-51 NO 4-wire SPST & 9-61 NC SPST Mercury Switch
 702 9-51 NO SPST & 9-64  3-wire SPDT Mercury Switch
 705 9-51 NO SPST & 9-64  3-wire SPDT Mercury Switch
 729 9-64  3-wire SPDT Mercury Switch
 804 (2) 9-64 DPDT Mercury Switch
 7000-153 SPDT Snap Switch
OPTIONS  STWStainless steel tag wiring
  23720Fungus proofing special 23720
  440V440 volt option for circuits

 

EXAMPLE1254820 125-4820 Liquid Level Control with SPST mercury switch closing on level fall, minimum specific gravity 0.88, cast iron body, general purpose case, switch rated at 10 amp 120 VAC/DC, 5 amp 24 VAC/DC, pressure rating 150 psi (10 bar), maximum process temperature 365°F (185°C).
CONNECTION125  Two Stage, Automatic Reset, Brass Trim, NEMA 1
125XLW  Replacement Float, Cap, and Switch Assembly Only, No chamber for 125
125WP  Two Stage, Automatic Reset, Brass Trim, Weatherproof Housing
125SST  Two Stage, Automatic Reset, SST Trim, NEMA 1
125XLS  Replacement Switch Assembly Only for 125
125SSTWP  Two Stage, Automatic Reset, SST Trim, Weatherproof Housing
CIRCUITS 4806 (2) 9-64  6-wire DPDT Mercury Switch
 4810 9-64  3-wire SPDT Mercury Switch
 4814 (2) 9-51  NO DPST Mercury Switch
 4815 (2) 9-51  4-wire SPDT Mercury Switch
 4820 9-51  NC SPST Mercury Switch
 4821 9-51  NO SPST Mercury Switch
 4822 Consult factory for details.
 4823 2 Stage Control, (2) 9-51 Mercury Switches
 4828 (2) 9-35AV 4-wire SPDT Mercury Switch
 4829 Consult factory for details.
 4831 2 Stage Control, (2) 9-51 NO SPST Mercury Switches
 4849 2 Stage Control, (2) 9-51 NO SPST Mercury Switches
 4853 2 Stage Control, (2) 9-64  3-wire SPDT & (1) 9-51 NO SPST
 4855 2 Stage Control, (2) 9-64  3-wire SPDT & (1) 9-51 NC SPST
 4857 Consult factory for details.
 5822 Consult factory for details.
 5823 2 Stage Control, (2) 9-51 Mercury Switches
 5831 2 Stage Control, (2) 9-51 NO SPST Mercury Switches
 5849 2 Stage Control, (2) 9-51 Mercury Switches
OPTIONS  STWStainless steel tag wiring
  23720Fungus proofing special 23720
  2507440 volt option for circuits
Service: Compatible liquids. Cast iron is not for use with lethal or flammable substances either liquid or gaseous.
Wetted Materials: Body: Cast iron. Float: 304 SS. Trim and packing gland: Brass. Packing: Carbon. Body gasket: Carbon.
Temperature Limit: 365°F (185°C).
Pressure Limit: 150 psig (10.34 bar).
Enclosure Rating: General purpose. Optional weatherproof.
Switch Type: SPDT snap switch or mercury switch. Optional DPDT or two stage.
Electrical Rating: Snap switch: 15 A @ 120/240/480 VAC, 0.5 A @ 120 VDC resistive, 0.25 A @ 240 VDC resistive. Mercury switch: 4 A @ 120 VAC/DC, 2 A @ 240 VAC/DC.
Electrical Connections: Screw terminal.
Conduit Connection: 7/8" (22.23 mm) hole for 1/2" (12.7 mm) conduit.
Process Connections: 1" female NPT.
Mounting Orientation: Vertical.
Deadband: Approximately 1-1/2" (38.1 mm).
Specific Gravity: 0.88 min.
Options: Manual reset.
Weight: 20 lb (9.1 kg).
Agency Approvals: CSA, UL. (Snap switch is not rated).
  • Special snap action switch mechanism options eliminates frequent operation due to surging water level
  • Transparent cover provides convenient visible operation of the switch
  • Flanged chamber for easy clean out and replacement of float or switch mechanism without removing the unit from piping