As far as I know, you cannot read the tempertaure at a specified location in a body using "Temperature Sensor" block. Simscape models are lumped parameter models, meaning that each block represents a "lumped" average state of a component. For example, volume of the tank block has an average temperature, rather than a distribution of temperatures. In some cases, like the pipe, a temperature distribution is assumed to calculate heat transfer accurately, but the state of the block is still just a lumped temperature value.
Regards,
Nirupama
