Series 123/125 Boiler Water Level Control
Brand: Dwyer Instruments, LLCThe Series 23 & 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.
Features- 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
 
Specifications
Approvals & Certifications
- CSA
 - UL - Snap Switch is Not Rated
 
Conduit Connection
- 7/8" Hole for 1/2" Conduit Hub
 
Deadband
- 1-1/2" (38.1 mm)
 
Electrical Connectors
- Screw Terminal
 
Electrical Rating
- 0.25 A at 240 Vdc Resistive - Snap Switch
 - 0.5 A at 120 Vdc Resistive - Snap Switch
 - 15 A at 120/240/480 Vac - Snap Switch
 - 2 A at 240 Vac/Vdc - Mercury Switch
 - 4 A at 120 Vac/Vdc - Mercury Switch
 
Enclosure, Body Material
- Cast Iron
 
Environmental Protection
- General-purpose
 - Weatherproof
 
Fluid Specific Gravity
- 0.8 is Min.
 
Gasket Material
- Carbon
 
Manual Reset
- Optional Manual Reset
 
Media
- Gas
 - Liquids & Gases
 
NPT Connection
- 1" NPT Female
 
Packing Material
- Carbon
 
Pressure Range
- psig: 150 (bar: 10.3, kPa: 1,034)
 
Sensor Orientation
- Vertical
 
Switch Type
- DPDT
 - SPDT
 
Temperature Range
- 0° to 185° C (32° to 365° F)
 
Trim Material
- Brass
 
Wetted Materials
- 304 Stainless Steel
 
- Boiler Low Water Cut-Off
 - Boiler Feed-Water Control
 - Condensate Tanks
 - Deaerators