What you'll learn
Connect a low-level thermocouple signal directly to a temperature input card with correct polarity and a single-point shield. Thermocouple extension wire must match the sensor type all the way to the cold-junction compensation terminals.
Lab time: ~15 minutes.
Lesson briefing
Thermocouple Input and Shielding
Connect a low-level thermocouple signal directly to a temperature input card with correct polarity and a single-point shield. Thermocouple extension wire must match the sensor type all the way to the cold-junction compensation terminals.
Why it is wired this way
A thermocouple generates millivolts; reversing its polarity makes temperature trend in the wrong direction. Ordinary copper splices introduce extra junctions and temperature-dependent error.
Commissioning standard
Before energising, prove protective earth and continuity, verify the drawing terminal-by-terminal, then energise through the protective device and measure the expected supply, signal and return values. Never use this training panel as a substitute for the machine manufacturer’s instructions, risk assessment, isolation procedure or applicable electrical standard.
Hints
Power the card from the 24 V bus before commissioning the channel.
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This lesson uses 7 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
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