SC-System: New family of signal conditioners from Pepperl+Fuchs

A width of just six millimeters, an extended temperature range up to 70 °C, and high long-term stability, reliability and precision—this is what characterizes the signal conditioners of the new SC-System that will be presented for the first time at this year's Hannover Trade Fair.

Figure 1: The 6 mm system modules are mounted on a DIN rail

The SC-System is a completely new development that combines the most powerful features of comparable products in a family of devices.

For example, calibration is performed by fully automated laser trimming of fixed resistors. This means: the best calibration results without production spread, and the risk of interference from trimming potentiometers due to their slider contact point is eliminated.

Electrolytic capacitors have been omitted, and alternative components used instead. The temperature-dependent reduction of the capacitance values observed with electrolytic capacitors, as well as signs of aging, is thus effectively counteracted. By replacing the electrolytic capacitors, the SC-System signal conditioners can be operated at an ambient temperature of up to 70 °C.

The low-power design, which ensures low self-heating, contributes to the wide temperature range in which the products can be operated.

The SC-System uses high-quality 3-way isolation between input, output, and supply which withstands a working voltage of up to 300 V and a test voltage up to 2.5 kV. The risk of short circuits in coils within the signal conditioner is counteracted by the use of PCB transformers. In this design, the transformer coils are integrated into the PCB, so that short circuits in coils due to faulty isolation are eliminated.

Effective use of the switch cabinet space is achieved by a compact design: the housings, which are just 6 mm wide, reduce the space requirement of the signal conditioner modules to a minimum. The housing height is so low that the modules fit between the narrow-seated cable channels.
Figure 2: Simple wiring with stacked screw terminals

The SC-System Portfolio
Transmitter power supplies are an integral part of the SC-System. They transfer the 4 mA … 20 mA signals from connected signal converters, and at the same time deliver the supply voltage for them. Transmitter power supplies are available with a signal splitting function and as SMART devices which, in addition to the analog signal, can transmit multiple HART variables.
Figure 3: Transmitter power supply, also available with a splitter function and as a SMART version

Temperature converters, loop-powered current repeaters, and universal signal converters for bipolar signals are also part of the portfolio of the new SC-System.

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