Purchase now: Weidmüller WDU 2.5/TC TYP J Terminal Block
Purchase now: Atlantech Drives provides you the Weidmüller 1550340000 (Model: WDU 2.5/TC TYP J), the dedicated **Thermocouple Terminal Block** for **Type J (Iron/Constantan)** temperature measurement circuits. In precision industrial heating applications (like plastic injection molding), accurate temperature feedback is critical. This terminal block features an internal current bar made specifically of **Iron and Constantan**, ensuring that the thermocouple signal is transmitted without creating a secondary «cold junction» that would distort the reading at the PLC or temperature controller.
Technical Specifications and Identification
The unit uses the robust **Screw Connection** system to securely clamp the solid or stranded thermocouple extension wires. It is rated for 2.5 mm² wiring. The housing is made of high-quality Wemid, offering UL 94 V-0 flammability rating. The specific alloy construction means the terminal effectively becomes «invisible» to the thermal signal, allowing the measurement instrument to read the true temperature at the sensor tip.
- Part Number: 1550340000.
- Model: WDU 2.5/TC TYP J.
- Application: Type J Thermocouples (Fe/CuNi).
- Current Bar Material: Iron / Constantan.
- Connection: Screw Clamp.
- Wire Size: 0.13 … 2.5 mm².
- Width: 10.2 mm.
- Mounting: TS 35 DIN Rail.
- Approvals: CE, UR.
Expert Tips: Polarity Check
Type J wires are magnetic. Expert Tip: Type J thermocouples consist of a Positive wire (Iron, White insulation usually) and a Negative wire (Constantan, Red insulation usually – check your local standard). The Iron wire is magnetic; the Constantan is not. If you are unsure which wire is which in an old cabinet, use a small magnet. Connect Positive to Positive and Negative to Negative on the terminal. Reversing polarity will cause the temperature reading to go *down* as the process heats up!
Frequently Asked Questions (FAQs)
Q: Why is the terminal wider (10.2mm)?
A: Thermocouple terminals are effectively two terminals in one block (one for +, one for -), allowing both conductors of the pair to be terminated side-by-side in a single block housing.
Q: Can I use ferrules?
A: Yes, crimped ferrules are recommended for stranded extension wires to prevent stray strands from causing a short circuit between the closely spaced poles.
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