Xylem 194-A-7B Low Water Cut-Off Pump Controller with Alternate Tappings

The Xylem McDonnell & Miller 194-A-7B is a combination low water cut-off and pump controller designed for commercial and industrial steam boilers. This model features a water column with integral alternate tappings for gauge glass and tri-cock installations, along with an integrated 7B potentiometer switch for maintaining constant boiler water levels.

Key Features:

• Low water cut-off and pump control with 135 ohm proportional signal control
• Water column with alternate tappings for gauge glass and tri-cock installations
• Maintains consistent water level regardless of pressure fluctuations
• Magnetic repulsion design eliminates bellows, reducing maintenance needs
• Automatic reset operation with No. 5 switch included
• 7B switch provides proportional 0-135 ohm control signal
• 1-1/4 inch NPT system connections
• Maximum operating pressure: 250 PSI (17.6 kg/cm²)
• Ten bolt flange construction for secure mounting
• Operates on 120V or 240V power supply

This float-operated control provides continuous protection against low water conditions in steam boilers of any steaming capacity. The 194-A-7B combines low water safety cutoff functionality with pump control capabilities, making it ideal for automated boiler systems that require precise water level management. The proportional control feature allows for modulating control of feedwater pumps to maintain optimal boiler water levels.