OEM PS791S Industrial Pressure Switch – Compact, set‑point control for pneumatic and hydraulic lines

PS791S is a compact, solid‑state pressure switch typically used to automate on/off control in compressed air circuits, light hydraulic skids, and general machine safety interlocks. From my experience, it’s the kind of drop‑in component maintenance teams keep on hand because it installs quickly and just works—no fuss—when you need a clean switching signal at a defined pressure.

Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery time: 1 week if in stock; no more than one month at the latest
• Payment terms: 50% advance payment; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• Adjustable set point and hysteresis – Lets you dial in the switching threshold for start/stop control; useful on compressors, filter monitoring, or vacuum pick lines.
• Transistor switch output (PNP/NPN) – Works with most PLC digital inputs; you can wire sourcing or sinking, which saves time during retrofits.
• Wide low‑voltage DC supply – Typically 12–24 VDC operation for easy panel integration next to sensors and solenoids.
• Rugged, compact body – Small footprint with vibration resistance; in many cases you can mount it directly on a manifold or regulator.
• Good environmental sealing – IP65/IP67 style construction on most builds, so washdowns and dust aren’t a constant worry.
• Stable switching – You might notice fewer nuisance trips compared to older mechanical switches, especially on pulsing pneumatic lines.

Technical Specifications

One thing I appreciate is how forgiving the PS791S tends to be with supply quality; even on older panels with a bit of electrical noise, the switch output remains stable. A packaging OEM we support swapped a mechanical diaphragm switch for this unit and immediately cut down on compressor short‑cycling alarms.

Related or Supporting Products

• SMC ISE20/ISE30 digital pressure switches – With display and dual outputs; good if you want on‑device setpoint visibility.
• IFM PN7xxx series – Pressure sensors with IO‑Link; adds diagnostics and easy parameter cloning.
• Gems Sensors PS71 – Rugged switch option for harsher hydraulics; more mechanical feel, fewer electronics.
• Panasonic/SUNX DP‑100 series – Compact digital pressure sensors; handy on space‑limited pneumatic gantries.
• Supporting parts: M12 4‑pin cordsets, 1/8″ G/NPT adapters, mini regulators with gauge, DIN rail terminal blocks for quick service loops.

Installation & Maintenance

• Mounting – Install on a rigid bracket or directly to the manifold port. Keep cable runs short and away from high‑current motor lines when possible.
• Cabinet/Environment – For IP65/IP67 performance, use appropriate cable glands and avoid placing the body where condensate can pool. Provide ventilation in enclosed cabinets.
• Wiring – 12–24 VDC supply; land the transistor output to a PLC DI with matching PNP/NPN polarity. Add a flyback diode across inductive loads if driving relays/solenoids.
• Set‑up – Adjust set point and hysteresis gradually while monitoring the downstream device status. You might want a slightly larger hysteresis to prevent chatter on pulsating lines.
• Routine care – Inspect fittings for leaks, check electrical connectors quarterly, and wipe off oil/dust. Re‑verify the set point after any pneumatic maintenance.
• Firmware/Updates – Not required for this discrete switch type; keep a record of settings and replacement date for your CMMS.

Quality & Certifications

• CE and RoHS compliant in most cases; UL recognition may apply depending on the specific build.
• Manufacturer warranty coverage: 12 months (365 days).
• Each unit is inspected prior to dispatch; we typically perform a basic functional check on supply voltage and output switching.

If you’re standardizing across multiple machines, we can match threads (G1/8 vs. 1/8 NPT) and output type so replacements are consistent. Send over your desired set point and wiring style, and we’ll align the PS791S configuration to your panel standard.