1、 Product Overview:

The electromagnetic heat meter consists of a flow measurement unit, a heat calculation unit, and an accurately paired temperature sensor (PT1000). Electromagnetic heat meters use Faraday's principle of electromagnetic induction to measure flow rate, combined with the supply and return water temperature signals from paired temperature sensors, to calculate, accumulate, store, and display the heat absorbed or released in the heat exchange circuit. The flow and energy calculation unit CPU and sampling module of the electromagnetic heat meter are all equipped with internationally advanced microcontrollers, which have large memory capacity and high equipment reliability. The heat calculation can truly achieve enthalpy value calculation, achieving high accuracy. The complete set of paired temperature sensors uses platinum resistance Pt1000, with a pairing error of ≤ 0.1 ℃. The accuracy level of the electromagnetic heat meter reaches level 2.

2、 Working principle:

The electromagnetic heat meter calculates and displays the heat released or absorbed by the system based on the flow signal of the flow sensor in the system, the supply and return water temperature signal detected by the paired temperature sensor, and the time of water flow. The heat is displayed in cumulative form, in kWh, with a maximum display of 8 digits.

The mathematical model for calculation is:

In the formula: - released heat, kJ；

M - the mass of the heat carrying liquid flowing through the thermal energy meter, kg/s；

——The specific enthalpy difference of the heat transfer liquid corresponding to the inlet temperature and outlet temperature in the heat exchange circuit, kJ/kg；

T - time, s

3、 Application scenarios:

An electromagnetic calorimeter is a measuring instrument that measures the heat released by a heat transfer fluid in a thermal conversion system. It uses a high-precision and high reliability electromagnetic flowmeter for flow measurement, and uses a high-precision and high stability platinum thermistor for temperature measurement, making the thermal energy meter have excellent measurement performance. It can be widely used for the measurement of heat in residential areas, office buildings, and centralized heating, heating, and air conditioning in enterprises and institutions.

4、 Main features:

1. The large screen LCD displays various parameters and can also provide on-site display instruments according to user needs.

2. Full CMOS low-power circuit design with low system power consumption.

3. Equipped with a communication module, it can achieve remote communication.

4. Equipped with valve control function, it can remotely control valve opening and closing, facilitating property fee management.

5. The measuring mechanism has no moving parts, no wear and tear, and the measurement accuracy is not affected by the service life.

6. It can be linked with the water pump or host in the computer room to stop metering when there is no cooling or heating, avoiding incorrect energy consumption metering caused by small flow rates and temperature differences in the pipeline when the system is not in use.

7. Integrated design, easy installation, safe and reliable.

8. Dual use of heating and cooling.

5、 Technical parameters of electromagnetic heat meter:

Converter technical parameters:

1. Power supply: 220V AC (110VAC~245VAC), 24VDC;

2. Power consumption: ≤ 20W (matching power consumption);

3. Accuracy level: Level 1 or Level 2 (matching accuracy);

4. Protection level: IP65;

5. Environmental temperature: Class A;

6. Temperature resolution: 0.01 ℃;

7. Optional temperature measurement range: -30 ℃ to 180 ℃;

8. Temperature difference measurement range: 1 ℃ to 90 ℃;

9. Maximum flow reading (m3): 99999999999 (ten digits);

10. Maximum reading of heat (Mwh): 99999999999 (ten digits);

11. Thermal units: kJ, MJ, GJ, kwh, Mwh optional;

12. Analog output: 4-20mA DC/600 load resistance (switchable between thermal and flow parameters);

13. Pulse output: maximum frequency of 5000Hz, pulse width ranging from 0.1ms to 999.9ms (switchable between heat and flow parameters);

14. Communication: RS-485 (RS-232, M-BUS, HART, etc. are optional).

Sensor technical parameters:

1. Nominal diameter: DN50-DN1400mm;

2. Nominal pressure: 0.6MPa to 4MPa;

3. Lining material: High temperature resistant rubber PTFE、PFA、F46；

4. Electrode materials: including molybdenum stainless steel, Hastelloy B, Hastelloy C, titanium, platinum/iridium alloy, tantalum;

5. Structural form: split type, integrated type;

6. Medium temperature: -30 ℃ to 180 ℃;

7. Connection method: flange type.

Technical parameters of temperature sensor:

1. Sensor type: PT1000;

2. Installation method: protective sleeve;

3. Temperature measurement range: -50 ℃ to 200 ℃;

4. Wire length: 0.6m to 15m.

6、 Installation method:

1. The heating system should install filters at the entrance of the building. Clean the system pipelines before heating to prevent debris from blocking the heat meter during pipeline installation. Sensors are best installed vertically (with fluid flowing from bottom to top). In this position, when the liquid is not flowing, solid substances settle while oil substances float up and do not adhere to the electrode. If installed horizontally, it is necessary to ensure that the pipeline is filled with liquid to avoid measurement accuracy being affected by air pockets;

2. The inner diameter of the pipeline should be consistent with the inner diameter of the sensor to avoid throttling phenomenon;

3. The installation environment should be kept away from strong magnetic field equipment to prevent interference. (such as engines, transformers, radio transmitters, electrolytic cells, or other places that cause electromagnetic interference);

4. The electromagnetic heat meter can be installed on the inlet pipe or the return pipe, and the installation position should be convenient for checking the meter. The upstream of the sensor should have a straight pipe length of not less than 5DN. If there is a non fully open gate or regulating valve upstream, the length of the straight pipe connecting the gate valve and the sensor should be increased to 10DN, and the downstream straight pipe length is generally not less than 3DN;

5. The maximum length of the connecting cable between the sensor and the converter is 100;

6. When using electrical welding, the welding joint must be kept away from the sensor to prevent damage to the lining due to overheating of the sensor or flying of welding slag;

7. The cable length of the temperature sensor is 4 meters, and the position of the return water temperature sensor and the position of the heat meter cannot exceed the length of the cable. If it exceeds, an agreement can be reached for supply;

8. The grounding wire diameter of the electromagnetic thermal energy meter should not be less than 5.5mm2, and it should be as short as possible, and avoid common grounding with other equipment (it is recommended to use separate grounding).

7、 Precautions.

1. The axis of the non measuring electrode must be approximately horizontal;

2. The measuring pipeline must be completely filled with liquid;

3. A straight pipe section with a length of 5 * D (D is the inner diameter of the flowmeter) is required in front of the flowmeter, and a straight pipe section with a length of 3 * D (D is the inner diameter of the flowmeter) is required behind it;

4. The flow direction of the fluid is consistent with the arrow direction of the flowmeter;

5. Vacuum inside the pipeline can damage the lining of the flowmeter, so special attention should be paid;

6. There should be no strong electromagnetic field near the flowmeter;

7. There should be ample space near the flowmeter for installation and maintenance;

8. If there is vibration in the measuring pipeline, there should be fixed supports on both sides of the flowmeter. When measuring mixed liquids of different media, the distance between the mixing point and the flowmeter should be at least 30 × D (D is the inner diameter of the flowmeter). To facilitate the cleaning and maintenance of the flowmeter in the future, a bypass pipeline should be installed.


10、 Selection Table