⎝⎛星力捕鱼⎞⎠

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Flow meter series
Temperature instrument series
Pressure instrument series
Calibration instrument series
Level instrument series
Digital display instrument series
Transmitter instrument series
Wire and cable series
Bridge instrument cabinet series
Pipe fitting valve series

Address: Xiongyi, Jinhe Road, Jinhu County, Jiangsu Province
Lunan
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Industry Information
The orifice plate flowmeter should be selected according to the site's industrial and mining conditions.
2012-3-30 10:03:35

与差压变送器及流量积算仪安装和接线 Orifice flowmeter and differential pressure transmitter and flow totalizer installation and wiring
1. There are two F4 gaskets between the orifice flowmeter and the three valve group (leakproof) 2. The differential pressure transmitter is installed on the three valve group (two gaskets are also required in the middle). There are two letters on the differential pressure transmitter, one is L and the other is H (L stands for low pressure, H stands for high pressure) 3. The two flanges on the orifice flowmeter have +, —, and the + flange is installed on the fluid The direction from which the-sign is the direction the fluid goes. Cannot be installed 4. The H end of the differential pressure transmitter is installed on the + side of the three valve group corresponding to the orifice plate, and the L end is corresponding to the-side of the orifice plate. (Cannot be installed in reverse) 5. Wiring: There are three terminals of the differential pressure transmitter when the back cover is opened: +,-, + the last one + no wiring. Just pick the + and-on the left. Corresponds to 4, 5, 6, and 6. of the flow totalizer's wiring terminals. The 6 of the flow totalizer is connected to + on the left-hand side of the differential pressure transmitter. The terminals 4 and 5 of the flow totalizer are connected to the terminals of the differential pressure transmitter—. After all the signal cables are connected, connect the 220v power supply (otherwise the flow totalizer will be burned). It is best to have a straight pipe section of about 5 meters, the longer the better


工作原理充满管道的流体流经管道内的节流装置,在节流件附近造成局部收缩,流速增加,在其上、下游两侧产生静压力差。 Orifice flowmeter works. Pipe-filled fluid flows through the throttling device in the pipe, causing local contraction near the throttle, increasing the flow rate, and generating a static pressure difference on its upper and downstream sides. Under the conditions of known parameters, the relationship between differential pressure and flow can be derived from the principle of flow continuity and Bernoulli's equation to obtain the flow. The basic formula is as follows:


c-dimensionless outflow coefficient


d—throat or throat diameter of the throttle under working conditions


D-Inner diameter of upstream pipeline under working conditions


qm-mass flow Kg / s


qv-volume flow m³ / s


ß-diameter ratio d / D dimensionless


Density of fluid Kg / m³


Dimensionless expansion coefficient


结构 Orifice flowmeter structure


Throttling device composition


Throttle parts: standard orifice plate, standard nozzle, long diameter nozzle, 1/4 round orifice plate, double orifice plate, eccentric orifice plate, round orifice plate, tapered entrance orifice plate, etc. Pressure-receiving device: ring chamber, pressure-receiving flange, clamping ring, pressure guiding tube, etc .; installation requirements for measuring tubes, orifice plate flowmeters: The requirements for straight pipe sections are generally the first 10D and 5D, so buy holes When the plate flow meter is used, it is necessary to select a flow meter suitable for the field industrial and mining according to the field industrial and mining conditions of the flow meter.