L404 and L604 Pressuretrol® Controllers are
line voltage pressure controllers that provide operating
control, automatic limit protection, or manual
reset limit protection for pressure systems of up to
300 psi.

Features 

• Can be used with steam, air, non-combustible gases, or fluids non-corrosive to the pressure sensing element.
• Stainless steel diaphragm (except 300 psi [21.1 kg/cm2 (2068 kPa)] models) also allows use with ammonia, oxygen, distilled water, and similar media.
  

• L404B is recommended for supervision of atomizing medium pressure in oil burner systems.
  

• Models are available with spst, spdt, or dpst switching and in variety of operating ranges.
  

• Dustproof, trouble-free mercury switches (all models except L404F, which has snap-acting switch).
  

• Automatic reset models have adjustable, subtractive differential (except L604M).
  

• Trip-free mechanism on manual reset models assures that limit function of controller cannot be defeated by jamming reset lever.
  

• Screw adjustments made on top of case.

• Scaleplates marked in English (psi) and Metric(kg/cm²) units.
  

• Clear plastic cover on case to observe pressure settings and switch action.
  

• Leveling indicator visible through cover.

• Hexagonal fitting with 1/4-18 NPT internal threads for direct mounting to 14026 Steam Trap (siphon loop).
  

• Surface mount is available using screws through holes (knockouts) in case backing.

Product Data (PDF)