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IM 04L20A01-01E

1-5

Explanation of Functions

Burnout Detection

When measuring temperature using a thermocouple and the thermocouple burns out,

you can specify the measurement result to be set to positive over range* or negative

over range.* Burnout can be set on each measurement channel.

* Positive over range is a condition in which the input signal is over the upper limit of the

measurable range. Negative over range is a condition in which the input signal is below the

lower limit of the measurable range. The measured value is indicated as “Burnout” for both

cases.

Reference Junction Compensation (RJC)

When measuring the temperature using a thermocouple, the reference junction

compensation can be used. You can select whether to use the reference junction

compensation provided by the FX100 or external reference junction compensation. If

you are using external reference junction compensation, you will also set the

reference voltage.

Note

When using the external reference junction compensation, set an appropriate reference

junction compensation voltage. As in the example in the following figure, if the reference

junction temperature for the external reference junction compensation is T0 °C, set the

thermoelectromotive force of the 0 °C reference for T0 °C as the reference junction

compensation voltage.

FX100

An example of External reference junction compensation

External reference junction compensation

(Maintain the junction between the

thermocouple and the copper wire at T

°C)

Thermocouple

Copper wire

1.2 Functions of the Input Section

YOKOGAWA FX103 User Manual

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