Honeywell L604N1009 Pressuretrol Controllers, 10-150 PSI

This Honeywell product provides operating control, automatic or manual reset limit protection for pressure systems up to 300 psi (2068 kPa). Use with steam, air, noncombustible gases, or other fluids non-corrosive to pressure sensing element. It provides dustproof, trouble-free mercury switching; L404F has snap-acting switching. There is a trip-free mechanism on manual reset models so the limit function of the controller cannot be defeated by jamming the reset lever. Adjustments are made by screws on top of case and the mount its uses 1/4 in. NPT female threads or surface mount through base of case.