Under Pressure? AutomationDirect Rolls Out Two Pressure Switch Series

AutomationDirect is now offering two new sets of mechanical pressure switches: the LPPS and S-18C series. The switches are designed to deliver reliable pressure sensing in demanding industrial environments without complex control hardware.

The series are straightforward mechanical pressure switches with built-in relay outputs, wide pressure coverage, and simple field adjustment. They’re intended to handle both low-pressure pneumatic systems and high-pressure hydraulic applications while keeping installation simple.

AutomationDirect has released two new mechanical pressure switch series: the AchieVe LPPS and S18-C. Image used courtesy of AutomationDirect

AchieVe Mechanical Pressure Switches

AutomationDirect’s new mechanical pressure switches are split into two series. The AchieVe LPPS series supports higher pressure ranges from 2 psig up to 3000 psig, with a 5A SPDT relay rated at 125 VAC (3A at 30 VDC), allowing direct load switching without external relays.

The AchieVe S18-1C series targets lower ranges from 3 psig to 120 psig and increases switching capacity to 10A at 125/250 VAC (5A at 30 VDC), making it more suitable for directly switching higher current devices in lighter-duty systems.

Both the LPPS series (left) and the S181C series (right) feature a brass housing, with either a BUNA-N diaphragm or a hardened steel piston. Image used courtesy of AutomationDirect

Mechanical Design and Performance

Both series use brass housings with either a Buna-N diaphragm or a hardened-steel piston, depending on the pressure range. Lower-pressure models use diaphragm sensing, while the higher-pressure units rely on piston designs for durability.

Setpoints for each model are field-adjustable, with repeatability of ±1 psi or 5% of range, and a differential of 10% to 20%. The LPPS series uses a locking screw for secure adjustment, while the S18-1C uses a thumbwheel for quicker setup. Mechanical life is rated at over 1 million cycles.

Environmental Ratings and Integration

The LPPS series is rated for NEMA 4 and 13, protecting against dust, water, and oil. Both series operate over a temperature range of -20°F to 220°F. High-pressure LPPS models also include strong safety margins, with proof pressures up to 15,000 psig and burst pressures up to 20,000 psig.

Each model includes M12 electrical connections, DIN-style connectors, and cable leads, while process connections are available in 1/8-inch and 1/4-inch NPT. The built-in SPDT relay simplifies wiring by enabling direct switching without additional components.

Typical electrical connections for the S18-1C. Image used courtesy of AutomationDirect

Reliable Sensing for Rugged Environments

AutomationDirect’s latest switches are suited for pumps, compressors, hydraulic and pneumatic systems, and general machine control. The AchieVe LPPS and S18-1C pressure switches are ideal for presses, engine monitoring, and machine tools where a defined pressure threshold needs to trigger an action. Because they’re mechanical and self-contained, the switches are a practical option for retrofit projects or systems that don’t require full electronic sensing and control.