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Principle of Variable Flow Meter(Rotameter)
- Principle of Rotameter (Flow Type) 2.
Flow rate when load pressure is applied (Measurement of gas)1.
As shown in Figure A, the fl oat type fl ow meter is generally used with the rear section of the fl ow meter exposed to the atmosphere or without any load (without pressure loss resistance).
The scale of such a fl ow meter is called "atmospheric scale."
The scale of such a fl ow meter is called "atmospheric scale."
Flow rate when load pressure is applied (Measurement of gas) 2.
The scale of such a flow meter is called "atmospheric scale." In fact, however, there often exists load pressure resistance as shown in Figure B.
As shown in the example of the principle, load pressure resistance does not allow the actual flow rate to be indicated.
There is a method to find a rough standard using the equation for calculation, but some er-ror will be caused because of the gap between theory and practice.
Such an error will be caused both in the pressurized condition and in the vacuum condition.
As shown in the example of the principle, load pressure resistance does not allow the actual flow rate to be indicated.
There is a method to find a rough standard using the equation for calculation, but some er-ror will be caused because of the gap between theory and practice.
Such an error will be caused both in the pressurized condition and in the vacuum condition.
3.
For example, the flow control valve and the like are arranged in the later stage as shown in Figure C to control the pressure applied to the flow meter with a pressure regulator or the like.
The scale of the flow meter is calibrated under that pressure condition. The scale of such a flow meter is called a "load pressure scale."
An example of us-ing the load pressure scale is our GM Series gas mixing equipment. In the GM Series, the basic fl ow sheet is used as shown in Figure C so that the gas obtained with a constant flow rate will be pressurized.
The load pressure scale of a flow meter with a valve on the outlet side (needle, etc. on top of RK-1250) is automatically calibrated at all times, but if the flow meter will be used independently, please inform us of this in advance and select the Panotation.
An extra charge will be added for load pressure calibration.
The scale of the flow meter is calibrated under that pressure condition. The scale of such a flow meter is called a "load pressure scale."
An example of us-ing the load pressure scale is our GM Series gas mixing equipment. In the GM Series, the basic fl ow sheet is used as shown in Figure C so that the gas obtained with a constant flow rate will be pressurized.
The load pressure scale of a flow meter with a valve on the outlet side (needle, etc. on top of RK-1250) is automatically calibrated at all times, but if the flow meter will be used independently, please inform us of this in advance and select the Panotation.
An extra charge will be added for load pressure calibration.
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