The ProTech-SX ("ProTech Simplex") is a safety PLC (programmable logic controller) with integrated overspeed protection designed to safely shut down any plant process equipment, engine, or steam, gas, or hydro turbine upon sensing a safety event.

This stand-alone safety system accepts two speed inputs and seven discrete/analog inputs, uses programmed logic to determine when a safety event has occurred, then issues system shutdown commands and alarms.

The ProTech-SX uses five fastacting, configurable relay outputs and a speed meter output to interface with/command the specific system or device being protected.

Designed to safely protect high-speed rotating equipment in system-critical applications, this safety PLC’s total response time is less than 12 milliseconds.

Programmable inputs and outputs, a 4–20 mA speed readout, and Modbus® * communications make this device easy to integrate into any plant, engine, or turbine safety system.

The ProTech-SX is available in a flush-mount model designed to be installed within a panel or cabinet door located in a control room or on the turbine skid.

Designed for harsh environments when installed within an enclosure, this device has an ingress protection rating of IP56 (protected against dust and completely protected against jets of water of similar force to heavy seas).

Depending on the model ordered, the ProTech-SX accepts either two high-voltage power inputs (90–240 Vac / 100–150 Vdc) or one high-voltage power input (90–240 Vac / 100–150 Vdc) and one low-voltage power input (18–32 Vdc).

This design works on a high-signal-select basis, allowing the unit to fully operate with either or both power sources available.