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Working principle and characteristics of thermal flowmeter
The working principle of a thermal flowmeter is that it is a direct mass flowmeter that can be used to measure mass flow. When the fluid is stationary
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Working principle of thermal flowmeter
A thermal flowmeter is a direct mass flowmeter that can be used to measure mass flow. When the fluid is stationary, the upstream and downstream temperatures of the heating element in the pipeline are symmetrically distributed, and the indicated temperatures of the elements are equal. When the medium flows, the downstream temperature is higher than the upstream temperature. As the flow rate increases, the temperature difference also increases. When the flow rate reaches a certain threshold, the temperature difference between the two components will gradually decrease with the increase of flow rate. In order to obtain the single value of the instrument, the characteristic of increasing temperature difference is generally used for measuring small flow rates, and the characteristic of decreasing temperature difference is used for measuring large flow rates.
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The basic principle of thermal measurement method is to heat the fluid in the pipeline from the heat source, and the thermal energy flows together with the fluid. The mass flow rate of the fluid is obtained by measuring the change in heat of the flowing fluid.
The thermal conductivity measurement method is based on the relationship between the dissipated heat of the heating element and the flow velocity to achieve flow measurement. The general method is to heat a very thin metal wire placed in a fluid with an electric current. The fluid flow will force the hot wire to cool, and the degree of cooling varies with the flow rate. Therefore, the flow rate and flow rate can be calculated by measuring the change in the resistance value of the hot wire.
Characteristics of Thermal Flow Meter
Characteristics of Thermal Flow Meter
1. No movable parts, reduced sealing surface, greatly reducing leakage rate, convenient for installation and daily maintenance;
2. Wide measurement range, with a maximum measurement range of 20:1 (liquid) or 30:1 (gas);
3. Accurate measurement and high precision, flange type can reach 0.2% (liquid) or 0.5% (gas);
4. Extremely high sensitivity, capable of measuring ultra-low flow rates, capable of measuring low flow rates of 0.08m/s, and electromagnetic flow meters of 0.5m/s;
5. Good repeatability, generally 0.05-0.08%, with optional small signal resection, non-linear correction, and selectable filtering time;
6. The pressure loss is small, and the small diameter is only about 1/2 △ P of the standard orifice plate; The pressure loss of DN100 caliber and above has significantly decreased;
7. Calibration is convenient. In addition to using standard equipment for calibration, dry calibration methods can also be used, such as the weight hanging method, which can be completed with a single button operation;
8. The flow range can be changed by replacing the blocking components according to actual needs, and the online detachable plug-in structure can achieve non-stop production, continuous flow maintenance or replacement;
9. Low power battery on-site display, capable of online direct reading of indication values. The display screen can simultaneously read instantaneous flow cumulative flow and percentage bar chart, and can switch to display compensation temperature and compensation pressure indication values;
10. Strong anti-interference and anti impurity capabilities, multiple output forms, able to transmit various parameters remotely, and can be used without mixing heat.
11. Gas measurement does not require temperature and pressure compensation, and can directly display standard volumetric flow rate.
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