ITRON flowmeter | How to calibrate a flowmeter (separate/integrated volume correction instrument)?

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1. Working principle of heat meter

The heat meter calculates the actual heat consumption value by measuring the flow rate of the heating pipeline and the temperature difference between the inlet and outlet water.

1. Core working principle: The heat meter uses the heat calculation formula Q=∫ c × ρ × Δ T × qv × dt, where - Q is the cumulative heat value (unit: kWh or MJ) - c is the specific heat capacity of water (4.1868 kJ/kg ·℃) - ρ is the density of water (changes with temperature) - Δ T is the temperature difference between the inlet and outlet water (℃) - qv is the instantaneous flow rate (m ³/h) - dt is the time integral.

2. Key component technical parameters 1 Flow measurement - mechanical: impeller speed detection, accuracy ± 3% - ultrasonic: time difference method speed measurement, accuracy ± 1% - electromagnetic: Faraday electromagnetic induction principle, accuracy ± 0.5% 2 Temperature sensor - Platinum resistance PT1000 (-50~200 ℃) - Pairing accuracy ± 0.1 ℃ - Installation spacing requirement ≥ 10 times the pipe diameter 3 Accumulator -32-bit ARM processor - Automatic enthalpy compensation - Data storage for ≥ 18 months

III. Installation and use specifications for missing pants and hands 1 Requirements for front and rear straight pipe sections: flow meter front 10DN and rear 5DN. 2. Installation position of temperature sensor: symmetrically arranged supply and return pipes. 3 Regular calibration cycle: 2 years/time (according to JJG 225-2001 standard) 4 Working pressure range: ≤ 1.6MPa (common specifications for civil buildings)

IV. Technical standard requirements comply with EN 1434-2015 standard requirements: - Overall accuracy level: 2-4 levels - Maximum allowable error:

2. What are the well-known brands and manufacturers of imported pressure reducing valves?

1. LOCKE from Germany, 2. YOSHITAKE from Japan, 3. Spirax, 4. Armstrong Chang type, etc. Suggest using German Locke, with discounted prices and long lifespan. German Locke steam pressure reducing valve German Locke micro pressure reducing valve German Locke gas pressure reducing valve

3. Which brand of imported pressure reducing valve is better?

Whether the imported pressure reducing valve is good or not mainly depends on the accuracy of the pressure reduction balance and the performance of the voltage stabilization.; Pressure reducing valve is a type of valve product with relatively high requirements; If it is a domestically produced pressure reducing valve for water use, it can also be used, such as the DeTaiKe brand in Beijing; If it is a steam pressure reducing valve and a gas pressure reducing valve, they are generally imported; For example, which brand of imported pressure reducing valve is better between the UKs Speisak and the USs Weidun VTON depends mainly on the product type. For example, for water pressure reducing valves, the better brands include the USs Tyco, the USs Yuanlan Weidun VTON, and the German Lite; If it is a steam pressure reducing valve, the main ones are Speisak from the UK, VTON from th

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