Omega OM-DAQXL-1 Series - Three Wire RTD Wiring; Four Wire RTD Wiring

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Hardware
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2.6.2.2 Three-Wire RTD Wiring
For 3-wire RTD sensors the second common lead must be connected to the
negative terminal of the next consecutive even channel.
2.6.2.3 Four-Wire RTD Wiring
For 4-wire RTD sensors the data logger performs a Kelvin resistance
measurement using 1 channel to supply excitation voltage and the next channel
to sense the voltage across the RTD.
Figure 2-14 Three-Wire RTD Wiring Example
Figure 2-15 Four-Wire RTD Wiring Example