ISA Certified Control Systems Technician (CCST) program
Certified Control System Technicians (CCSTs) calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables.
A thermocouple wire is brought back to a thermocouple input card in the PLC. The thermocouple cable is 10 feet long. The thermocouple is measuring a fluid flowing at 125°C. Due to gouging of the cable insulation, the two wires in the cable have been shorted together 5 feet from the PLC input card. The result of this short on the temperature observed at the PLC input is:
A. There will be no issue; the input will read 125°C at the PLC.
B. The short in the cable will cause damage to the input card channel and a fault will be displayed.
C. The input will read a temperature closer to the ambient temperature.
D. The temperature at the PLC input card will read 62.5°C since the short is halfway between the measurement point and the PLC.