• Brass threads provide a metal-to-metal seal that ensures a leak-free installation
• Integrated wrench flats enable secure installation without damage to the housing
• Compact size, easy to install and wire
• Green LED indicates power on
• Red LED indicating low water condition
• Solid state operation
• 15000 ohm probe sensitivity

McDonnell & Miller RB-24

• Patented adjustable probe sensitivity
• External LEDs and simplified wiring for easy
• Probe-style, microprocessor-based control that detects the fluid level in hot water and steam boilers and reacts when the level falls below the minimum safe operating level
• Includes external test butTon, adjustable delay on break (DOB) and delay or make (DOM)
• SPDT switch contact

• 50 VA at 24 VAC pilot duty rating
• 2-1/8" probe
• 30 sec delay on make, 10 sec delay on break
• Features an automatic reset, test switch and LED low water indicator light
• No lock out with loss of power if probe is in water
• Self-cleaning probe
• NEMA 1 enclosure

• 125 VA pilot duty rating
• Compact design
• Interrupts power immediately in a low water condition
• Features test butTon, on board indicating lights and easy to follow installation instructions
• Automatically restarts burner on return of water level
• Includes plug-in wire harness with labeled quick connect terminals

• 2-1/8" probe
• 30 sec delay on make, 10 sec delay on break
• Features an automatic reset, test switch and LED low water indicator light
• No lock out with loss of power if probe is in water
• Self-cleaning probe
• NEMA 1 enclosure

• Automatically shuts off burner in a low water condition to prevent boiler damage
• Heavy duty electro-mechanical design for long life
• Manual reset feature requires manual reset if low water condition exists for 30 sec or longer
• Equipped with shorter probe for mounting in standard reducing tees
• SPST switch contact