Switch isolators supply power to the proximity sensor in a hazardous area, receive a proportional current, convert input signals to digital output signals and transfer switching signals to a control device such as DCS or PLC.
The switch isolator consists of three primary components: the power supply, the transistor switch amplifier and the output stage. Galvanic isolation separates the input, output and power supply circuits.
The isolator input stage is designed in accordance with DIN EN60947 (NAMUR). This means the residual voltage in normal operation is approximately 8 VDC and the short circuit current is approximately 8 mA. The switch points are typically between 1.2-2.1 mA.
Many Pepperl+Fuchs isolators offer optional lead breakage and short circuit monitoring (activated by slide switches) for the hazardous area circuit. These isolators feature three outputs that can be reversed using the mode of operation switch: relay, active transistor and passive transistor outputs.
Choose from various selection criteria like safety integrity level, performance level, device function, and signal type and find the SIL/PL assessed device that you are looking for.
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Pepperl+Fuchs is a leading developer and manufacturer of electronic sensors and components for the global automation market. Continuous innovation, enduring quality, and steady growth have been the foundation of our success for more than 70 years. Pepperl+Fuchs employs 6,300 people worldwide and has manufacturing facilities in Germany, USA, Singapore, Hungary, Indonesia and Vietnam, most of them ISO 9001 certified.