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Principle of Variable Flow Meter(Rotameter)
- Flow meter with flow controller
- When pressure changes during flow control, variable primary pres-sure flow controllers (Model 2204) and variable secondary pressure flow controllers (Model 2203) are used to make the flow constant. Such flow meters with a valve are Model 2504FR and 2503F.
1.
The variable primary pressure flow controller has a valve that controls the flow so that it will be constant even if the pres-sure on the primary side (inlet side) changes, and the flow meter is arranged as shown in Figure A.
In other words, this flow measuring control method is effective when P1 changes and P2 remains con-stant or is released to the atmosphere.
This flow meter with a valve is a lower valve type, because it meets the condition that the pressure applied to the fl ow measuring section should be constant.
In other words, this flow measuring control method is effective when P1 changes and P2 remains con-stant or is released to the atmosphere.
This flow meter with a valve is a lower valve type, because it meets the condition that the pressure applied to the fl ow measuring section should be constant.
2.
The variable secondary pressure flow controller can make the flow constant when the secondary-side pressure loss changes provided the primary pressure is constant.
It can be used in combi-nation with the flow meter as shown in Figure B. In the case of this valve, the primary pressure is constant, and it is used as an up-per valve as shown in the figure to control the pressure P1, which is applied to the flow meter, with a pressure regulator or the like.
There-fore, the flow meter scale is calibrated according to the scale in a state where pressure P1 is applied (load pressure scale).
It can be used in combi-nation with the flow meter as shown in Figure B. In the case of this valve, the primary pressure is constant, and it is used as an up-per valve as shown in the figure to control the pressure P1, which is applied to the flow meter, with a pressure regulator or the like.
There-fore, the flow meter scale is calibrated according to the scale in a state where pressure P1 is applied (load pressure scale).
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