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『Differential pressure orifice flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Calculation of current for orifice flowmeter
Calculation of 4-20mA current signal for orifice flowmeter directly corresponds to the flow percentage. The calculation formula is: current value=(flow value ²/maximum flow value ²) × 16+41 The differential pressure signal of the core calculation formula orifice flowmeter is proportional to the square of the flow rate, and is converted into a linear current signal by the transmitter. The standard calculation formula is as follows: - When the current flow value (F) and the upper limit of the flow range (Fmax) are known, the output current (mA)=(F ²/Fmax ²) × 16+4- When the current differential pressure value (Δ P) and the upper limit of the differential pressure (Δ Pmax) are known, the output current (mA)=(Δ P/Δ Pmax) × 16+4 (note: the formula is based on the relationship between differential pressure and flow rate square Δ P ∝ F ², and the transmitter outputs 4-20mA linearly). 2. Calculation example: Assuming a steam pipeline orifice flowmeter: - Flow range: 0-10 t/h - Current flow rate) 5 t/h Calculation process: Jiqing - (5 ²/10 ²)=0.25-0.25 × 16=4-4+4=8 mA corresponds to an output current of 8mA at a flow rate of 50% (non-linear relationship) 3 Important parameter settings • Differential pressure transmitter quantity estimation range: Δ Pmax value set according to the orifice plate calculation sheet (such as 0-100kPa) • Flow upper limit value: maximum process flow (such as 10 t/h) • Square opening processing: Early systems require square opening, while modern intelligent transmitters can directly embed square opening calculation • Current calibration: Zero point (4mA) corresponds to zero flow, and full degree (20mA) corresponds to Fmax 4. Installation and comm
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2.1 minutes to understand the difference between balance flowmeter and orifice flowmeter
The core difference between balance flowmeter and orifice flowmeter lies in their working principle, structural composition, performance characteristics, and application scenarios, as follows:
1. Working principle Balance flowmeter: Based on the energy balance positive roll principle design, it belongs to a new type of differential pressure flow instrument.
. Through unique Reynolds number design, increased thickness of throttling components, and high-precision machining, the fluid flow performance approaches that of a Venturi tube, resulting in a concise structure and significantly improved performance. Orifice flowmeter: It calculates the flow rate by measuring the pressure difference generated when the fluid flows through the orifice plate. The pressure difference is proportional to the flow rate and is a typical conventional differential pressure flowmeter.2. Structure and Composition Balance flowmeter: It consists of a pipeline and a flowmeter body, and contains a porous disk throttling rectifier (balance flow sensor) inside.
. The size and di