Purchase now: Weidmüller WDU 2.5/TC TYP K Terminal Block
Purchase now: Atlantech Drives provides you the Weidmüller 1550250000 (Model: WDU 2.5/TC TYP K), a specialized **Thermocouple Terminal Block** designed specifically for **Type K (Chromel/Alumel)** temperature sensor circuits. Standard copper terminals create a «parasitic cold junction» when connected to thermocouple wires, introducing significant temperature errors due to the Seebeck effect. This terminal block solves that problem by using a current bar made of the exact same **Type K alloy** materials, ensuring material continuity from the sensor to the measurement instrument.
Technical Specifications and Accuracy
The WDU 2.5/TC TYP K features Weidmüller’s reliable **Screw Connection** technology (Clamping Yoke), ensuring a gas-tight, vibration-proof contact essential for low-voltage millivolt signals. The terminal is clearly marked on the current bar to prevent mixing with standard terminals. It fits on a standard TS 35 DIN rail and supports wire cross-sections up to **2.5 mm²**. The housing is made of Wemid (Dark Beige), resistant to 120°C.
- Part Number: 1550250000.
- Model: WDU 2.5/TC TYP K.
- Application: Type K Thermocouples (NiCr/Ni).
- Current Bar Material: Chromel / Alumel.
- Connection: Screw Clamp.
- Wire Size: 0.13 … 2.5 mm².
- Width: 10.2 mm.
- Color: Dark Beige.
- Temp Range: -50 °C … +120 °C.
Expert Installation Advice: Shielding
Thermocouple signals are weak (mV). Expert Tip: While this terminal handles the alloy continuity, you must also manage electrical noise. Always use **shielded thermocouple extension cables**. Connect the shield to the PE (Earth) bar at one end only (usually the cabinet entry) to prevent ground loops. Do not run these wires in the same duct as VFD motor cables.
Frequently Asked Questions (FAQs)
Q: Can I use it for Type J sensors?
A: No! Type J uses Iron/Constantan. Using a Type K terminal (Chromel/Alumel) for a Type J sensor will introduce a massive measurement error. Use part number 1550340000 instead.
Q: Is it internally bridged?
A: No, thermocouple terminals are strictly 2-pole feed-through (Signal + and Signal -) to maintain the separate alloy paths.
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