Each DSCT47 thermocouple input transmitter provides a single channel of thermocouple input which is filtered, isolated, amplified, linearised, and converted to a process current output. Signal filtering is accomplished with a five-pole filter, which provides 85dB of normal-mode-rejection at 60Hz and 80dB at 50Hz.

An anti-aliasing pole is located on the field side of the isolation barrier, and the other four are on the process loop side. After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges.

Linearisation is achieved by creating a non-linear transfer function through the module itself. This non-linear transfer function is configured at the factory and is designed to be equal and opposite to the thermocouple non-linearity.

Features

• Interfaces to Type J, K, T, E, R, S, B, and N Thermocouples
• Linearises Thermocouple Signal
• 3Hz Signal Bandwidth
• Process Current Output
• 1500Vrms Transformer Isolation
• ANSI/IEEE C37.90.1 Transient Protection
• Input and Output Protected to 240VAC Continuous
• Up to 60V Loop Voltage
• 160dB CMR
• 85dB NMR at 60Hz, 80dB at 50Hz
• ±0.10% Accuracy
• Easily Mounts on Standard DIN Rail
• CSA and FM Approvals Pending
• CE Compliant