Purchase now: Wago 750-461 PT100 Input Module
Purchase now: Atlantech Drives provides you the Wago 750-461, a precision **2-Channel Analog Input Module** designed for **RTD (Resistance Temperature Detector)** sensors. It is specifically optimized for **PT100** sensors (DIN IEC 60751). Unlike generic resistance modules, the 750-461 performs the linearization internally, delivering the temperature value directly to the PLC in 0.1°C or 0.01°C increments, saving processor load and programming time.
Technical Specifications and 3-Wire Connection
The 750-461 supports the direct connection of **2-wire** or **3-wire** PT100 sensors. The **3-wire** connection is the industry standard as it automatically compensates for the cable resistance, ensuring accurate temperature readings even if the sensor is 100 meters away. It has a resolution of **16 bits** and covers the standard industrial range of -200°C to +850°C. The module is galvanically isolated from the system bus.
- Part Number: 750-461.
- Channels: 2 RTD Inputs.
- Sensor Type: PT100 (others via config).
- Connection: 2-Wire / 3-Wire.
- Resolution: 16 bits (0.1°C).
- Conversion Time: ~320 ms per channel.
- Measurement Current: Typ. 0.5 mA.
- Error: < +/- 0.6 K.
- Wire Connection: CAGE CLAMP®.
Expert Tips: Noise Rejection
Temperature signals are slow and sensitive. Expert Tip: The 750-461 has a relatively slow conversion time (320ms) because it includes a **50 Hz / 60 Hz line filter**. This is excellent for rejecting noise from nearby AC power cables. However, do not use this module for fast-changing dynamic processes (like measuring the intake air of a racing engine). For fast temp measurement, you need specialized high-speed modules. Ensure you configure the filter frequency (50Hz or 60Hz) in the software to match your local mains frequency for best noise immunity.
Frequently Asked Questions (FAQs)
Q: Can I connect a PT1000?
A: No, the 750-461 is hardware-optimized for PT100. For PT1000 sensors, you need the **750-460** or a configurable module like the 750-464.
Q: How do I wire a 2-wire sensor?
A: Bridge terminals 1 and 3 (and 5 and 7 for Ch2) to compensate for the missing third wire, but be aware that cable resistance will add error to the reading.
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