Heat meter

A heat meter, thermal energy meter or energy meter is a device which measures thermal energy provided by a source or delivered to a sink, by measuring the flow rate of the heat transfer fluid and the change in its temperature (ΔT) between the outflow and return legs of the system.

A heat meter consists of Superstatic: Principle:  The main part of the flow passes through a Venturi nozzle in the pipe,  creating the differential pressure to bypass the other part of the flow   through the fluid oscillator.

pressure oscillations are converted into an   electric signal by a piezo sensor and detected by the integrator Approval Rating  Class 2 MID Billing Approved  Yes RHI Approved  Yes Power Supply  Battery / Mains Mechanical: Principle:  A traditional pulsed mechanical water meter supplied with   a separate integrator for energy calculation Approval Rating  Class 3 MID (due to the Class 3 rating on the mechanical meter) Billing Approved  Not for non domestic RHI Approved  Not for non domestic Power Supply  Battery / Mains Ultrasonic: Principle:  working on the Doppler frequency sensors installed in upstream and   down stream  picking up flow and disturbance along the pipe and   compensated by a temperature sensor.

Approval Rating  Class 2 MID Billing Approved  Yes RHI Approved  Yes Power Supply  Battery / Mains UK Heat Meter Regulations •For any non domestic application where the meter will be used for Billing (including sub metering) the meter must be MID Class 2 approved - Class 3 is not suitable.

•Class 3 meters can be used for domestic billing •Heat meters used for non domestic RHI (Renewable Heat Incentive) must also comply with accuracy class 2 or better of the Measuring instrument directive(MID) [2]