Pipeline type electromagnetic heat meter, split type electromagnetic heat meter

One Product Overview:

Compared to other types of heat meters, the ZY-LDE-RL electromagnetic heat meter has more stable and reliable measurements. The LCD screen simultaneously displays parameters such as accumulated heat, accumulated flow rate, instantaneous heat, instantaneous flow rate, inlet temperature, outlet temperature, and temperature difference. It consists of a flow measurement unit, a heat calculation unit, and a precisely 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.
Billing principle:
The ZY-LDE-RL 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. Heat is displayed in cumulative form, in kWh, with 8 digits displayed.
The mathematical model for calculation is: Q=qmΔhdt
In the formula: - released heat: kJ；
QM - Mass of heat carrying liquid flowing through the thermal energy meter: kg/s；
Δ h - the difference in specific enthalpy of the heat transfer liquid corresponding to the inlet temperature and outlet temperature in the heat exchange circuit: kJ/kg；
T - Time: s。
Advantages of ZY-LDE-RL Pipeline Electromagnetic Heat Meter:
1. It can directly display various parameters required by the system, such as cumulative heat, cumulative flow rate, instantaneous flow rate, supply water temperature, return water temperature, temperature difference, etc. It is emphasized that the integrated electromagnetic heat meter not only has the heat calculation function that general heat meters have, but also has the function of instantaneous flow measurement. That is to say, an integrated electromagnetic heat meter is a combination of a thermal energy meter and a flow meter in a general thermal system. The integrated electromagnetic heat meter can feedback the instantaneous flow value to the control system through the communication system, and the control system can adjust the output of the variable frequency water pump based on the current flow value, thereby adjusting the hydraulic balance of the system.
However, typical heat meters do not provide instantaneous flow values; Or due to limitations in the principle, the provided instantaneous flow rate value is only a reference value.
2. The measurement channel is a smooth straight pipe section that does not block or cause pressure loss due to flow detection, resulting in good energy-saving effect. Under the current national conditions, the water quality of our country's air conditioning or heating systems is very poor, inevitably containing impurities such as solid particles and hemp fibers. As the integrated electromagnetic heat meter does not have mechanical moving parts, these impurities will not block the meter, causing inaccurate measurement or even damage to the meter. However, traditional mechanical heat meters are prone to clogging, damage, and inconvenient to debug and maintain; Although ultrasonic heat meters do not have moving parts, ultrasonic heat meters measured using the time difference method can only be used for cleaning liquids. In the current situation where water cleanliness cannot be guaranteed, the accuracy of ultrasonic heat meters using the time difference method cannot be guaranteed when measuring water containing impurities; After a period of use, the accuracy will decrease due to the easy attachment of impurities to the transducer and reflector column; The Doppler method can only be used to measure liquids containing a certain amount of suspended particles and bubbles, and its measurement accuracy is also not high.
3. The flow measurement principle of the pipeline electromagnetic heat meter determines that the output is only proportional to the average flow velocity of the measured medium, and is independent of the flow state under symmetrical distribution (laminar or turbulent). So the range of the integrated electromagnetic heat meter is extremely wide, with a measurement range of up to 100:1, and some even have an operational flow range of up to 1000:1.
4. The installation and construction of pipeline electromagnetic heat meters are convenient. Due to the integration of the computing unit and flow measurement unit, there are no redundant connections, making installation and construction relatively simple. There is no need for pre embedding due to the presence of many connections. Iron pipes, on-site wiring; It will not cause wiring misalignment and pose difficulties for debugging work. Even if the user needs to display the instrument locally, it is only necessary to pull a communication cable down. However, traditional split type heat meters require the installation of two temperature sensor cables and one flow signal cable, which is difficult and complex to construct; Due to the need to shield iron pipes and extend cables, the cost also increases.
8. Dual use of heating and cooling.
II Basic technical parameters of ZY-LDE-RL pipeline 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℃ ～ 180℃；
8. Temperature difference measurement range: 1 ℃ to 90 ℃;
9. Flow reading (m3): 99999999999 (ten digits);
10. Heat reading (Mwh): 9999999999 (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).
III 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℃ ～ 180℃；
7. Connection method: flange type.
4 Technical parameters of temperature sensor:
1. Sensor type: PT1000；
2. Installation method: protective sleeve;
3. Temperature measurement range:- 50℃ ～ 200℃；
4. Wire length: 0.6m to 15m.
Five Installation method of ZY-LDE-RL pipeline electromagnetic heat meter:
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. The sensor is 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, ensure that the pipeline is filled with liquid to avoid 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 length of the connecting cable between the sensor and the converter is 100;
6. When using electrical welding, keep the weld 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).
Application scope:
ZY-LDE-RL pipeline electromagnetic heat meter is a measuring instrument for measuring the heat released by the 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.
Range confirmation:
The flow velocity of the measured medium in general industrial electromagnetic heat meters should be 2-4m/s. In special cases, the minimum flow velocity should not be less than 0.2m/s and the maximum should not be greater than 8m/s. If the medium contains solid particles, the commonly used flow rate should be less than 3m/s to prevent excessive friction between the lining and the electrode; For viscous fluids, the flow velocity can be chosen to be greater than 2m/s. A higher flow velocity helps to automatically eliminate the effect of viscous substances attached to the electrode, which is beneficial for improving measurement accuracy.
Under the condition that the range Q has been determined, the size of the flowmeter diameter D can be determined based on the range of flow velocity V mentioned above, and its value can be calculated by the following formula:
Q=πD2V/4
Q: Flow rate (㎡/h) D: Inner diameter of pipeline V: Flow rate (m/h)
The range Q of the electromagnetic heat meter should be greater than the expected flow value, and the normal flow value should be slightly greater than 50 on the full scale of the flow meter.
VI Selection of flowmeter lining:

7 Selection of imported protective flanges and grounding flanges (or grounding rings):

8 Product measurement flow range:

Nine Specification and model of pipeline electromagnetic heat meter:

Ten Precautions for selection and selection:
1 DN10-DN15， The lining material standard design is F46 (FEP), with a temperature resistance of 180 ℃;
2. Measure the heat of hot water with a temperature ≤ 140 ℃, and choose PTFE as the inner lining;
3. Measure the heat of hot water with a temperature ≤ 250 ℃, and choose silicone fluororubber as the lining;
4. In situations with negative pressure, choose F46 as the lining with steel wire mesh.

Disclaimer: Jiangsu Zhongyi reserves the right to modify the product design, specifications, and parameters of the pipeline electromagnetic heat meter, as well as the final interpretation right of the data information. To learn more about the series of flowmeter products, please call Jiangsu Zhongyi for more detailed technical information.