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Pt100 signal converter, passiv; fix adjusted, conversion of Pt100 to 4-20mA resp. 0-10V, 2 switching outputs

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  • 2-wire-technology 4...20mA
  • 3-wire-technology 0...10V
  • Two freely adjustable PNP switching outputs
  • 12 different standard measurement ranges or adjustment by customer specification
  • Connection of Pt-100 in 2- or 3-wire circuit
  • Sensor break supervision
  • Certification for the connection of intrinsically safe devices [EEx ia] IIC
Application description

The rail fastenable temperature transmitter WTA - 100 - G0, for connection to an temperature resistor Pt100 is a temperature signal converter for measurement, conversion and supervision of temperatures in the range from -100°C to +600°C with a measurement span between 20 Kelvin and 700 Kelvin.

Due to two implemented PNP switching outputs, separate evaluation devices are not necessary in many cases


Function description

The temperature transmitter WTA 100-G0 is conceived for assembly on rail fastening acc. to DIN EN 50022-35.

A constant current from an integrated current source is feed to a 2- or 3-wire Pt100 resistor that is installed in a sensor. This current leads to a voltage drop at the Pt100, that becomes higher or lower, dependent on the measured medium temperature.

The produced resistance proportional voltage signal is measured by the transmitter and is than linearized and converted into a constant current signal 4...20mA or a constant voltage signal 0...10V.

The measured voltage signal of the Pt100 is supervised and in the case of sensor breakage a failure information is produced on to the 4...20mA resp. 0...10V output signal. The output signal rises in that case to 21,7 mA or 10,85 V. At a sensor short circuit the signal goes to 3,55 mA resp. 0 V.

There are two per potentiometer freely adjustable, overload and short circuit protected PNP switching outputs integrated, whose function can be arbitrary selected to quiet or working current principle. The change between these two functions can be carried out using two pin straps inside the housing.

The limit value can be adjusted by a front sided potentiometer according to the output signal using a helping voltage that can be measured at the front sided measurement sockets. At this sockets the voltage 0,2V equals the output zero signal (0V / 4mA) and 1,0V equals the output end signal (10V / 20mA)