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Documents: 125-4821

Instruction Manual Series 123/125 Catalog Page Mercury More Info

125-4821 | Water level control | cast iron chamber | SPST mercury switch | opens on decrease. | Dwyer

Water level control, cast iron chamber, SPST mercury switch, opens on decrease.

Brand: DwyerSKU: 125-4821

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Overview Details for 125-4821

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Water level control | cast iron chamber | SPST mercury switch | opens on decrease.

Series 123/125 Boiler Water Level Control

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

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

Series: 123/125 Boiler Water Level Control
Category/Type: Level
Type: Level Switches
Series: 123/125 Boiler Water Level Control
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: Ambient Temperature: 212°F (100°C);Process Temperature: 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).