ICENI/AI-03
9.3
Signal Measurements
The signal at each input channel and the temperature of the cold junction is
measured and combined in a calculation to establish the temperature sensed by
each thermocouple sensor.
This real world measured temperature value (in °C or °F), already cold junction
compensated, is made available to the field communications network and shown on
the master module display.
Scaling for input signals is such that a value of 500 represents a real world measured
temperature of 500°C or 500°F.
9.4
Cold Junction Compensation
The ICENI/AI-03 module has an internal temperature sensor to measure the
temperature at the cold junction. This temperature is used in the calculation of
sensor signal temperature.
Although only four thermocouple signal channels are supported by the ICENI/AI-03
module, the cold junction temperature is provided as channel five.
This real world measured temperature value for the cold junction (in °C or °F) is
made available to the field communications network and shown on the master
module display.
Scaling for the cold junction temperature is such that a value of 500 represents a real
world measured temperature of 50.0°C or 50.0°F.
It is recommended that when connecting a simulated thermocouple signal to a
module that the cold junction temperature indicated by that particular module is used
in any simulation calculations.
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