Pressure Measurement & Control

Programmable pressure sensors

June 2001 Pressure Measurement & Control

Turck now produces a complete new line of fully programmable pressure sensors - reliable, solid-state devices available with a variety of options to fill many pressure analysis applications. The robust devices operate on the piezoresistive principle and have no moving mechanical parts to wear out. Capable of measuring in either bar or psi units, the new sensors are ideal for monitoring pressure in applications such as automotive welding, hydraulic clamping systems, machine coolant, pump run dry, vacuum for pick-and-place systems and other precision pressure analysis applications.

They are easy to set up. Programming is achieved using pushbuttons on the front of the sensor and it requires no pressure to set up. This allows users to reduce downtime, by programming parameters before installation. Programmable features, including PNP or NPN outputs, bar or psi measuring units, setpoint and response time delays, peak pressure memory function and 13 pressure ranges from vacuum -100 kPa (-1 bar) to 6 MPa (600 bar), provide the flexibility to adapt and perform in any application.

The self-contained units can monitor pressure up to 6 MPa (600 bar) and offer adjustable switch point response times from 5 to 500 ms. All models include a 4-digit, segment digital display that facilitates set up via a programming menu and provides continuous pressure data.

The sensors are available in AC or DC versions; with analog outputs, switching outputs, or both. The outputs can be used in the standard hysteresis mode for over/under-pressure or as a window. On the analog output models, the upper range of the analog output can be adjusted to meet specific application needs. Analog output models also include a shunt calibration function for manual or automatic diagnosis. The dual output version offers two setpoints that can be programmed completely independent of one another. The dual outputs can be set up for normally-open or normally-closed, standard hysteresis or window function, NPN or PNP, or any combination thereof. Integral circuitry protects the sensors from short-circuit damage.

The rugged units combine a metal housing, ceramic piezoresistive measuring cell and stainless steel hydraulic connection to provide a 10 million cycle rating and extremely high pressure ratings. A clear plastic cover protects the face of the sensors while allowing the digital display and output LEDs to be seen. Turck pressure sensors are CE, UL and CSA approved, and conform to IP67 standards.


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