Advantech 4718 user manual Analog Input, Accuracy for Thermocouple

Appendix A Specifications

A.1 Analog Input

Table A.1: Analog Input

Channels	8 differential
Input type	mV, V, and mA
Input range	J, K, T, E, R, S and B Thermocouple
	Uni-polar 0~15mV, 0~50mV, 0~100mV,
	0~500mV, 0~1V, 0~2.5V, 0~20mA,
	4~20mA
Sampling rate	10 samples/s(total)

Accuracy	±0.1% or better (voltage and current input)
Zero drift	±0.3 uV / °C
Span drift	±25 ppm / °C
CMR @ 50/60 Hz	92 dB
Input impedance	1.8 M

A.2 Accuracy for Thermocouple:

Table A.2: Accuracy for Thermocouple

Input Range	Typical Accuracy	Maximum Error
J thermocouple 0 to 760 °C	±1.0 °C	±1.5 °C
K thermocouple 0 to 1370 °C	±1.0 °C	±1.5 °C
T thermocouple -100 to 400 °C	±1.0 °C	±1.5 °C
E thermocouple 0 to 1000 °C	±1.0 °C	±1.5 °C
R thermocouple 500 to 1750 °C	±1.2 °C	±2.5 °C
S thermocouple 500 to 1750 °C	±1.2 °C	±2.5 °C
B thermocouple 500 to 1800 °C	±2.0 °C	±3.0 °C

NOTE: Due to the location of the CJC sensor, the measurement will have a 1°C max. difference in channels.

USB-4718 User’s Manual 34