More Questions

Questions
 

1. If a temperature controller has a set-point of 121°C, and the control sensor is a platinum resistance thermometer, whose resistance is increasing with time due to ageing;  does the process temperature increase, stay at 121°C or decrease as the PRT ages?
2. If a temperature controller has a set-point of -20°C, and the control sensor is a platinum resistance thermometer, whose resistance is increasing with time due to ageing;  does the process temperature increase, stay at -20°C or decrease as the PRT ages?

Answers next week but also consider how a temperature indicator would respond.
 
Some of the intriguing discussions from our temperature course for more information contact Dave Ayres at:  [email protected]