Eaton XN300 Manual

Also see for XN300: Manual Instruction manual

26 Analog input module XN-322-10AI-TEKT26.2 Wiring topic195 XN300 slice modules 02/24 MN050002EN Eaton.com26.2.5 How the total tolerance for analog inputs is calculatedIn order to illustrate how the analog inputs' tolerance is calculated, we will beusing the same type K thermocouple as an example.Example showing the formula for total error, error for cold-junction compen-sationRefer to ￫ Table 12 Measurement accuracy for total error: ±0.7% ofmaximum reading0.7%: Measurement accuracy relative to the maximum reading of 40 mV for the module's entire ambienttemperature range of 0 to 60 °C940 °C: Specified measurement range for type K thermocouple38.9 mV: Thermal voltage of type K thermocouple relative to 940 °C40 mV: Specified measurement rangeThis does not include the additional measurement error caused by thethermocouple's connection resistance or the thermocouple's ownmeasurement error as a function of the thermocouple class.When using the internal cold-junction compensation function, a cold-junctioncompensation error of ±2 °C is additionally added.I.e., the total internal module accuracy for a thermocouple measurementwith a type K thermocouple comes up to ±8.8 °C for the module's entireambient temperature range of 0 to 60 °C.Cumulativeerror [940°C] = ± 0.7 % * 940 °C * 40 mV = ± 6.8 °C38.9 mV