Infos A320 Fam.
...The temperature of the hydraulic fluid is monitored at the outlet of the low pressure
( LP ) filter of each system. The LP filter is the last component in each system before
the fluid returns to the reservoir of that system...
A300 +A310
...In each system, a resistor type overheat sensor on the return line at the reservoir
provides signals, through an electronic overheat monitoring unit...