Confusions about rotameters
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There is currently a glass rotameter used for measuring water, with a flow rate range of 10–100 liters per hour； Question: What is the flow range when using this flow meter to measure air? Can it be converted? How to convert?
It can be converted. But you need to give the pressure and temperature of the air!
This is no longer a matter of conversion. Rotary flowmeters designed for measuring liquids cannot be used to measure gases, as the floats used in them are different. The specific gravity of the medium is not relevant; the same rotor cannot be used for measurement.
Theoretically it’s possible, but many conditions are required; recalculation is too cumbersome. Rotary flow meters are very cheap; I recommend that you buy a new glass rotary flow meter for gases.
For rotameters, if the medium to be measured or the operating conditions often need to be selected from several options, it is necessary to inform the manufacturer at the time of ordering to have a cone tube made, and then decide how many floats and dials to order based on the selected conditions. This solves the problem mentioned by the original poster. Yokogawa Electric can be ordered in this way; the original poster can consult their technical staff about it. Be sure to ask the technical staff first, as sales representatives might refuse your request.
It can be calculated, but there may be some error after the calculation. You can contact me if needed
It doesn’t seem to be suitable for general use; the float inside is not appropriate for gas phase applications
A glass rotameter, which costs just a few dozen dollars – is it really necessary to go to such lengths? Depending on the process conditions, just buy a new one! For relevant information, use Baidu! ! !
I’ve encountered the same problem as well: several rotors are needed to measure the flow rates of air and oxygen. I tried to ask them to supply a set with two different dials, but they simply refused to do it, saying that one unit can only be purchased for one specific operating condition
Those upstairs can contact me directly; we mainly deal in AALBORG rotameters from the United States