Application Scenarios
A batch chemical plant running six jacketed reactors was fighting a familiar problem: every temperature point required a head-mounted transmitter, a 24 V loop supply, and a spare-part variant for each measuring range. Cabinet space had run out, and mean time to repair on a failed loop averaged over two hours because technicians had to isolate and re-range the transmitter before they could even measure the sensor.The engineering team replaced the transmitter layer with WAGO 750-461 modules mounted directly in the field I/O cabinets. Pt100 sensors were wired straight into the module in 3-conductor configuration, and the 750-461 handled linearization internally, so the PLC received ready-to-use temperature values in tenths of a degree. Eight temperature inputs now occupy the rail width previously taken by four transmitter channels, and when a sensor lead fractured during a cleaning cycle, the red channel LED on the 750-461 identified the fault in seconds — no multimeter, no HART handheld, no guesswork.The same logic applies in pharmaceutical cold-chain monitoring, food and beverage pasteurization, HVAC plant rooms, plastic extrusion barrel control, and marine engine-room temperature supervision. In each case, the pain point is identical: too many discrete transmitters, too much cabinet volume, too much commissioning time. The 750-461 collapses all three into a single 12 mm slice.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 750-461 |
| Manufacturer | WAGO |
| Product Category | 2-channel analog input module (RTD / resistance thermometer temperature input) |
| Number of Inputs | 2 (2-conductor or 3-conductor, 3-wire factory preset) — two sensors per module, no external transmitter required |
| Sensor Type | Pt100 factory preset; orderable variants for Pt200, Pt500, Pt1000, Ni100, Ni120, Ni1000, and resistance measurement |
| Temperature Range | -200 … +850 °C (Pt) — covers cryogenic inlet monitoring through to flue-gas and kiln duty |
| Resolution | 0.1 °C over the entire range — tenth-degree granularity without a separate high-end card |
| Conversion Time | 320 ms per channel (typ.) — fast enough for thermal process loops with long time constants |
| Measuring Accuracy | < ±0.2 % of full scale at 25 °C; temperature coefficient < ±0.01 %/K — stable across cabinet temperature swings |
| Measuring Current | 0.5 mA (typ.) — low enough to keep sensor self-heating negligible |
| Response Delay | Max. 4 s from power-up or sensor connection to first valid measured value |
| System Supply | DC 5 V via data contacts; current consumption 80 mA — no field-side auxiliary power needed |
| Electrical Isolation | 500 V system/field via optocoupler — protects the bus and coupler from field transients |
| Data Width | 2 × 16-bit data; 2 × 8-bit control/status (optional) |
| Connection Technology | 8 × CAGE CLAMP® spring terminals; 0.08 … 2.5 mm² / AWG 28 … 14; strip length 8 … 9 mm |
| Dimensions / Weight | 12 × 100 × 69.8 mm (W × H × D); 62.6 mm from upper edge of DIN-35 rail; approx. 50.7 g |
| Operating Temperature | 0 … +55 °C operation; -40 … +85 °C storage; IP20; pollution degree 2 per IEC 61131-2 |
| Vibration / Shock | 4 g per IEC 60068-2-6; 15 g per IEC 60068-2-27 |
| Approvals | CE, UL 508, ATEX / IECEx (II 3 G Ex ec IIC T4 Gc, II 3 D Ex tc IIIC T135 °C Dc), CCCEx, UKEx, marine approvals ABS, BV, DNV, KR, LR, NK, PRS, RINA |
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