Wedge Flow Sensor

Principio:

According to Bernoulli’s formula, the flowing fluid obeys the law of conservation of energy, that is the sum of the kinetic energy and the static energy is constant. When the fluid is passing the “V” shape block, the flow area reduces, the flow velocity increases, the static pressure reduces, which produce the static pressure difference, the pressure difference’s square root is in direct proportion with the flow rate, so measure the differential pressure can calculate the flow rate. The wedge flow sensor is non-standard part, so every wedge flow meter must be calibrated with the fluid before leaving factory.

The flow rate (Qx) calculating formula as follow:

Qx: Volume flow rate, (Unit: m3/s)
C: Discharge coefficient
ε：Expandable coefficient
m: Throttling area ratio
D: Pipe Inner Diameter ( Unit: m )
△P : Differential pressure ( Unit: Pa )
ρ：Process density of the fluid (Unit: Kg/m3 )

Características del producto:

● Especially suitable for flow measurement of the liquid with high viscosity, low Reynolds number or the liquid with suspend substance and bubbles.
● The permanent pressure loss is lower than that of orifice plate.
● The wedge structure has the function of guiding the flow and anti blocking.
● Compensation to viscosity variation, temperature variation, density variation.
● Anti-Vibration, anti-strike, anti-smudgy.
● With the function of bidirectional measurement.
● Good repeatability, after calibration, accuracy is 1.0% ~ 1.5%.
● Simple structure, no movement part, wear-resisting, no need of re-calibration during long term using.
● Anti-corrosion metal material available for the wedge type flow sensor and using DP transmitter with remote seal.

Parámetros técnicos:

Installation and using

(1) Make sure the fluid which is close to the upstream of wedge flow sensor is fully developmental turbulent flow and no swirls.
(2) Make sure the average inner diameter’s error in at least 2 x DN length of pipe at the upstream of the wedge flow sensor not excess±3% of the average pipeline’s inner diameter.
(3) The wedge flow meter can be installed on the horizontal or vertical pipeline with same nominal diameter. The pipeline’s inner wall shall be smooth and no attached substance. If the flow sensor is vertical mounting, the fluid shall flow from down to up, shall make the flow meter can exhaust the air bubbles conveniently to avoid the instrument’s zero point drifting.
(4) The installation diagram of the wedge flow meter as follow:

(5) The upstream and downstream of the wedge flow meter shall be configurated with straight pipe, different wedge ratio request different straight pipe length at the upstream of the wedge flow meter, please refer to the following table: