Hello Galbas,
The XTR105, XTR112, and XTR114 include all of the excitation, linearization, and amplification circuitry to design a complete 2-wire 4-20mA sensor transmitter for RTD sensors. The XTR105 is meant for PT-100 RTDs, the XTR112 for PT-1000, and the XTR114 for PT-5000 sensors. While the XTR112 could be used with a single-element strain gauge, the linearization circuitry is specific to RTD sensors and wouldn't work as well with strain gauges.
The XTR106 is designed specifically for bridge sensors and includes all of the required circuitry including 2.5V and 5V excitation sources, linearization, and amplification circuits as shown in the figure below. Figure 3 in the product datasheet describes the connections and equations required to correct for both positive and negative bridge nonlinearities.
Let us know if you have any additional questions.
