Selection guides, application notes, and industry insights for pressure control professionals.
Danfoss pressure switch buyer's roundup — You hear it all the time in panel shops: “Get a pressure switch with more contacts — DP, DPDT, whatever — it’s more robust, it’ll last longer.” That’s one of those half-truths that sounds right until you look…
Danfoss pressure switch buyer's roundup — You spec a pressure switch in ten minutes. Five years later, that switch has cost you seven times its purchase price in downtime, service calls, and early replacement — if you picked the wrong one.
Danfoss pressure switch buyer's roundup — You're not selecting a pressure switch by the paint color on the housing. You're selecting it because a compressor kicks on at 150 psig, an evaporator fan draws 4 A, and the whole panel lives inside a 50 °C…
Danfoss pressure switch buyer's roundup — Myth: "For a low-maintenance panel, any adjustable pressure switch will do — just pick the cheapest one." The reality is that the single variable that dictates total service calls — contact endurance at the…
Danfoss pressure switch buyer's roundup — You know the drill. The refrigeration rack trips on high-pressure during a hot pull-down. You swap the switch, the new one’s setpoint looks right on the box — 300 psig cut-out, 250 psig differential.
Danfoss pressure switch buyer's roundup — The number: Danfoss MP55 series pressure switches are rated for 16 A at AC-15 (inductive) per IEC 60947.
Danfoss pressure switch buyer's roundup — A 200 psig setpoint drifts by 12 % after the third freeze-thaw cycle. The line doesn’t trip until the pressure hits 235 psig — by then the chiller has already bypassed.
Danfoss pressure switch buyer's roundup — Not a “best of” parade. A pressure switch doesn’t drift or wear out gracefully – it either holds setpoint or it doesn’t.
Danfoss pressure switch buyer's roundup — If you’ve ever watched a refrigeration rack drop out because the pressure switch chattered on a generator transfer, you know the real problem isn’t the switch rating – it’s what happens at the threshold where…
Danfoss pressure switch buyer's roundup — Fair warning: Every rated specification below is taken from manufacturer data sheets ; where I derive an illustrative value (e.g., cycle life under high-vibration) I mark it as roughly or assume.