Heat meters measure thermal energy transferred by a heat-conveying liquid. PT1000 RTDs measure temperature through a predictable change in platinum resistance; the sensing element itself is not a digital output device. A heat meter uses temperature measurement together with flow information and its configured calculation method. The role of PT1000 sensors in a heat meter A heat meter commonly measures the liquid temperature at the flow and return points. The difference between these readings contributes to the energy calculation, while a flow sensor measures how much heat-conveying liquid passes through the circuit. The calculator combines these measurements using the fluid