Archie
Member
Many of those working with PLCs and control systems are familiar with thermocouples. Most know the basic concept of how temperatures are measured using thermocouples. But how well do you really know the principles that make them work?
Here is a thought provoking question to make you think about how they really work..... Start with a temperature indicator or controller that accepts and is setup for a J Type thermocouple. Using a very short (less than 1") piece of copper wire, jumper the 2 terminals where the thermocouple would normally be connected. With this jumper in place what would you expect the temperature reading on the indicator to be and why?
Here is a thought provoking question to make you think about how they really work..... Start with a temperature indicator or controller that accepts and is setup for a J Type thermocouple. Using a very short (less than 1") piece of copper wire, jumper the 2 terminals where the thermocouple would normally be connected. With this jumper in place what would you expect the temperature reading on the indicator to be and why?