Analogue Signal Processing 156Analogue Signal Processing The problem particularly important to avoid mutual The product program interference of multiple sensor circuits, contains the following functions: The real world can be measured in many for example, ground loops in interlinked Current transformer ways, for example, via temperature, measurement circuits. The wide range of Voltage transformer humidity, air pressure and so forth. products includes all functions for Thermocouple conditioners for The parameters of these different physical converting separation and monitoring resistance thermometers qualities change continuously. Elements signals. The different designs in Frequency signal conditioner that monitor statuses and changes in sta- connection with the respective functions Potentiometer conditioner tuses of a given environment, must reflect cover practically all applications in AC signal conditioner these continual changes. industrial measurement technology. Bridge measurement conditioner Within the framework of industrial moni- With these new products, Weidmller Limit value monitoring modules toring tasks, the statuses of an environ- offers the possibility of taking into account AD/DA converter ment are monitored by using sensors. the demands of modern automation These sensors should provide signals that technology with the inclusion of analogue These products are categorised according enable connected evaluating and monitor- signals. These products guarantee an to functionality as pure signal conversion, ing installations to draw detailed conclu- elementary function between signals from 2-way-isolation, 3-way-isolation and as sions concerning the status of, for exam- the field and the further processing passive separation. ple, a production process. The sensor sig- systems. The mechanical characteristics nals trace the continuous changes in the of these products correspond to those of monitored range. The signals can be in the well-known Weidmller products and analogue or digital form which means in are part of a continuous, ongoing normal cases, an electrical voltage or cur- concept. The signal conditioners can be rent value is produced that corresponds combined together with other Weidmller proportionally to the monitored physical products. quantities. Increasing automation with the They have been electrically and intention of achieving or maintaining cer- mechanically designed to ensure that only tain predetermined statuses makes the a minimum of wiring and maintenance processing of analogue values increasingly costs are necessary. important. This is also true of fields beyond those where this has been neces- sary and standard for a long time, for example, processing technology in the chemical industry. Standard electrical signal values are the norm within the framework of this processing technology. Current values from 0...20 mA, 4...20 mA or voltage values from 0...10 V have been introduced as sensor output values for differing physical quantities. Weidmller has taken account the need for increasing automation with the processing of these analogue signals, and offers a wide range of products that are designed for handling sensor signals. This means, units are made available for standard signals (0...20 mA, 4...20 mA, 0...10 V) that generate output signal values proportional to the variable input signals, and at the same time enable the safe separation of, for example, sensor circuits of an evaluation circuit. This safe separation is 157 Analogue Signal Processing