Analog input module SCM7B37

voltagecurrent

SCM7B37 non-linearized isolated thermocouple modules accept a single channel of input from Type J, K, T, E, R, S, or B thermocouples. The signal is filtered, isolated, amplified, and converted to a high-level analog voltage for output to the process control system. Cold junction compensation (CJC) is performed using an NTC thermistor externally mounted under the field-side terminal block on the backpanel. Open thermocouple detection is upscale using a 30nA current source in the input circuitry. These SCM7B37 non-linearized isolated thermocouple modules incorporate a five-pole filtering approach to maximize both time and frequency response by taking advantage of both Thomson (Bessel) and Butterworth characteristics. One pole of the filter is on the field side of the isolation barrier; four are on the process control system side.