The new universal trip amplifiers in the Pepperl + Fuchs K-System monitor up to two independent limit values and their associated hysteresis. Two independent, adjustable relay outputs enable the limit values to be generated for various signalling tasks.
The input circuits are galvanically isolated from the outputs, from the programming input and from the auxiliary power supply.
Set-up is easily achieved via the 'parameterising' interface and a PC running Windows 3.1, Windows 95/98 or Windows NT.
Benefits to be had include:
* Ex/non-Ex - optional control circuit to [EEx ia] II C, or in the lower priced non-Ex version.
* Speed - power rail connection and removable terminals mean rapid commissioning and simplified servicing.
* Adaptability - the trip amplifier processes all commonly employed signals, eg 0-20 mA, 0-10 V; thermocouple types B, E, J, K, L, N, R, S and T; Pt 100 or Ni 100 resistance temperature sensors in 2, 3 and 4-wire technology.
* Security - Lead breakage is signalled via a red LED on the front panel and the relay outputs are controlled in the safe condition.
* Independence - two relay outputs provide the ability to set MIN/MIN, MIN/MAX and MAX/MAX limit values. The hysteresis and the mode of operation of the switch outputs can be separately selected for each switch point.
* Load capacity - the two idependent relay outputs can be loaded up to 2 A.
* Simplicity of communication - this universal trip amplifier is capable of on-line communication, ie during operation - and without loss of the Ex protection: all current settings can be read out and modified; all measured values can be displayed; the specially developed user interface satisfies the requirements of VDI/VDE-GMA 2187.
* Choice of versions - Supply voltage: 24 V d.c.;KFD2-GU-1 Non-Ex version; KFD2-GU-Ex 1 Ex version.
A 230/115 V a.c. version is in the process of development.
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