2-way-isolation separates the signals galvanically and decouples the measurement

circuits. In so doing it eliminates potential differences caused by long cable lengths and

common reference points. Furthermore, the galvanic isolation offers protection against

destruction by overvoltage, and against inductive and capacitive interferences.

3-way-isolation also decouples the supply voltage from the input and output circuits,

and enables the function with only one operating voltage.

The passive isolator offers a further elementary advantage; it needs no additional volt-

age supply. The supply to the modules ensues via the input circuit and is the trans-

ferred to the output. This current loop supply is distinguished by very low power con-

rize the voltage signals from the thermocouple. This guarantees an exact conditioning

of analogue signals by eliminating sources of interference and errors.

Frequency converters convert frequencies to standard analogue signals. This

enables controllers connected in series to directly process impulse trains when making

speed or rotational speed measurements.

It is inconceivable to think about automation without analogue-digital-analogue

ronment and the customary digital processing, within the framework of process moni-

toring, it is necessary to convert analogue signals into digital signals. Weidmüller offers

modules for the following standard input and output signals: 0...20 mA, 4...20 mA and

Voltage monitoring modules can be used to monitor direct and alternating voltages.

reliably recognised and reported via the adjustable threshold function.

Modules for monitoring of revolutions and torque enable the control of cyclic move-

ments on conveyor belts, ventilators and pumps. The output responds after a set

amount of time, should the expected impulse not be received. The reliable potential-

free relay contact, signalises the interference to the responsible component group.