Final answer:
A thermocouple-type temperature-indicating instrument system uses a thermocouple to measure temperature based on the voltage generated due to temperature difference.
Step-by-step explanation:
A thermocouple-type temperature-indicating instrument system involves the use of a thermocouple, which is a device made of two different metals connected at one end.
When there is a temperature difference between the two ends, a voltage is generated, which can be measured to determine the temperature.
For example, if a thermocouple made of copper and constantan is used, as the temperature of the constantan end changes, a voltage is produced that corresponds to the temperature change.
This voltage can be used to indicate the temperature.
Therefore, the correct statement concerning a thermocouple-type temperature-indicating instrument system is that it uses a thermocouple to measure temperature by detecting the voltage generated due to temperature difference.