Working principle
When the water through the heat meter which installed in the heat exchange system, then meter’s calculator calculates and display the release or absorption of heat energy according to flow quantity from the flow sensor and the temp. signal of Inlet and Return flow from matching temp. sensors, and the water flow through time，the formula is like this：
In the formula：Q——the release heat quantity from the medium kJ；
qm——the reheat liquid instantaneous mass flow quantity through the heat
meter kg/s；
∆h——the specific enthalpy difference of heat carrying liquid from inlet
temperature and outlet temperature in the heat transfer loop kJ/kg；
t——Time s
The key components of ultrasonic heat meter
◇ Flow transducers
Installed in the heat exchange system, this part collects water flow quantity and send the
signal。
◇ Temperature sensor pair（PT1000）
One pair of metrological characteristics consistent or similar temperature sensor respectively measure the inlet and outlet temperature in the heat exchanging system on the same heat meter。
◇ Counter
Receiving the signals from the flow transducers and matching temperature sensors, then calculating, storage and display the heat (cold) value in the heat exchanging system
Technical Specification
Diameter | Min Flow | Transitional Flow | Max Flow | Length |
qmin（m³/h） | Qt（m³/h） | qmax（m³/h） | mm | |
DN 15 | 0.015 | 0.024 | 1.5 | 110 |
DN20 | 0.020 | 0.032 | 2.0 | 130 |
DN25 | 0.035 | 0.056 | 3.5 | 160 |
DN32 | 0.060 | 0.096 | 6 | 180 |
DN40 | 0.100 | 0.16 | 10.0 | 200 |
Measurement Accuracy | Class 2 | |||
Connection | Threaded connection | |||
Pressure Loss | ≤0.02MPa | |||
Maximum Working Pressure（MWP） | 1.6MPa | |||
Flow Measuring Range | 1:100 | |||
Temperature Sensor | 1.5m standard a pair of PT1000 Temperature Sensor （cable length could be changed） | |||
Data Storage | Continuous store of 18 months record | |||
Power-off Protection | After power-off, meter could save all the record of before flow rate and the corresponding time, after power back, it recovery measure function automatically, and ensure the time continuation | |||
Remote Transmission | M-Bus | |||
Power Supply | High Power Lithium battery | |||
Protection Class | IP67 (IP68 need to modify) | |||
Environmental Class | Class B | |||
Temperature Range | （4～95）℃ | |||
Temperature Difference | (3~90) K | |||
Installation Way | Inflow or Return flow（Default is Inflow, for return flow need to indicate when ordering） | |||
Installation Position | Horizontal / Vertical | |||
Permanence | Service cycle≥10 years | |||
Display | 8-bit LCD display | |||
Anti-magnetic Disturbance | When the intensity of magnetic field interference is not more than 100 ka/m, should not affect water meter measurement and remote transmission characteristics | |||
