McDonnell & Miller Series 157 Low Water Cut-off/Pump Controller 157-S

McDonnell & Miller Series 51-2 Mechanical Water Feeder/Low Water Cut-off 51-2, #2 Switch For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water feed. Quick-change replaceable cartridge valve and strainer. Optional features - No. 2 switch - Manual reset - Float block. Proportional feed action. Model 51 can be field upgraded with a No. 2 switch to add low water cut-off function. Maximum water supply pressure 150 psi (10. 5 kg/cm2). Maximum inlet water temperature 120°F (49°C). Maximum vessel pressure 35 psi (2. 5 kg/cm2). Made in ...

Safguard 450 Series Low Water Cut-Off W/Remote Mount Probe, 120V Burner circuit contacts open after 15 second delay in a low water condition. Delay prevents short cycling caused by momentary fluctuations in the boiler water level. Automatically reactivates burner circuit 30 seconds after water reaches the probe, allowing optional water feeder to raise water level above the probe. Made in the USA . Click for Instructions

Safgard™ 500 Series 24V Gas Hot Water Low Water Cut-off Hydrolevel low water cut-off electronically monitor the water level in low pressure steam boilers. The probe sensor mounts directly in the boiler at or above the lowest safe water level. The control allows the burner to operate normally as long as the water level remains in contact with the probe. Made in the USA . Click for Instructions

Safgard™ 600 Series Low Water Cut-Off W/Auto Reset, Commerical, 24V Interrupts power immediately in a low water condition. Automatically restarts burner on return of water level. Features test button, onboard indicating lights and easy to follow installation instructions. Model 1100 includes plug-in wire harness with labeled quick-connect terminals. Model 1100 is available with additional wiring harnesses for popular boilers. Made in the USA . Click for Instructions

Safgard™ 400 Series 24V Gas Steam Low Water Cut-off Hydrolevel low water cut-off electronically monitor the water level in low pressure steam boilers. The probe sensor mounts directly in the boiler at or above the lowest safe water level. The control allows the burner to operate normally as long as the water level remains in contact with the probe. Made in the USA .