McDonnell & Miller Head Mechanism 93-HD, Use With Series 93, 193

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™ 550 Series Low Water Cut-Off W/Manual Reset, Short Probe, Commereical, 120V Interrupts power immediately in a low water condition. Burner circuit locks-out if water remains below probe for 30 seconds. Manual reset will not trip due to power failures. Test button checks burner circuit to ensure proper control operation and lock-out function without lowering the water level. Note: Can also be used as a secondary cut-off on steam boilers. 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

For residential and commercial low pressure steam boiler applications. For boilers of any steaming capacity. For mounting in 2-1/2" NPT boiler side tapings. Insertion lengths available in 13/16 - 41/8" (30-105mm). Pack less bellows. Adjustable BX outlet for easy installation. Dual precision switches for dependable operation of the low water cut-off and an alarm or electric water feeder. Optional low voltage switches for self-generating mill volt circuits. Maximum steam pressure 20 psi (1. 4 kg/cm2). Made in the USA .

For commercial and industrial low or high pressure boiler applications. For boilers of any steaming capacity. Monel bellows provides corrosion resistance. Snap action switches for high temperature service - 1 Single pole, single throw switch for pump control - 1 Single pole, double throw switch for low water cut-off and alarm actuation. Optional features - Manual reset - 2 Single pole, single throw switches - 2 Single pole, double throw switches - Float block - BSPT threads. Maximum pressure 150 psi (10. 5 kg/cm2). Made in the USA .