WTAU –100 / 120 / 200 / 220
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Application
The active isolation amplifier of the series
WTAU
is used to linearize Pt100 temperature signals, to convert it
into one resp. two galvanic isolated electrical standard signals or to adjust the signals in the zero value and/or
end value resp. amplification.
A galvanic isolation is sometimes the only possibility at error generating ground loops, unwished signal
overlapping and potential problems.
Thus, a current flow between more signal current circuits that distort the signal is avoided.
The free configurable resp. fix signal conversion, dependent on version, allows the flexible adaption of the Pt100
temperature signal to different systems, e.g. to the standard signal input of a SPS control.
The adjustable version is suitable, if sections, e.g. +10°C...+40°C of a standard temperature signal 0°C...+50°C
should be amplified to a complete standard signal e.g. 4...20mA or for zero value adjustment e.g. because of
temperature losses caused by heat transfer.
At the versions WTAU – 200 – U0 / WTAU – 220 – U0 the Pt100 temperature signal is converted in parallel into
two electrical standard signal. Thus the Pt100 temperature signal can be doubled, to use it in two separated
evaluation circuits.
Function
Measuring principle
Version WTAU – 100 – U0 / WTAU – 200 – U0 – adjustable version
The connected resistance proportional electrical Pt100 voltage signal is measured by the evaluation circuit,
linearized, adjusted according to the front-sided trimmer and transmitted galvanically isolated to the
simultaneous output signals 0...10V and 0...20mA or 2...10V and 4...20mA according to the settings of the
internal configuration switches.
The respective current resp. voltage signals at the output can be used simultaneous. Therefore there are
simultaneous 2 output signals at the single channel versions WTAU – 100 – U0 and simultaneous 4 output
signals at the double channel version WTAU – 200 – U0 are available.
Examples:
WTAU – 100 – U0 Input signal 0°C..+100°C is converted to
output signal
0...10V / 0...20mA
WTAU – 100 – U0 Input signal 0°C..+50°C is converted to
output signal
2...10V / 4...20mA
WTAU – 200 – U0 Input signal 0°C..+50°C is converted to
output signal 1
0...10V / 0...20mA
output signal 2
2...10V / 4...20mA
Version WTAU – 120 – U0 / WTAU – 220 – U0 – fix adjusted version
The connected resistance proportional electrical Pt100 voltage signal is measured by the evaluation circuit,
linearized and transmitted galvanically isolated to the to the output signal 0...10V or 0...20mA or 4...20mA.
At the version WTAU – 220 – U0 the Pt100 input signal is transmitted simultaneously to the both output
channels.
Examples:
WTAU – 120 – U0 Input signal 0°C..+100°C is converted to
output signal
0...10V
WTAU – 220 – U0 Input signal 0°C..+50°C is converted to
output signal 1
0...10V
output signal 2
0...20mA
