A range of Glass flow meters suitable for Air or Water

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What is the difference between a Direct Read and a Reference scale flowmeter?

1. Direct Read Flowmeter:
   • In a direct read flowmeter, the scale on the glass tube is clearly marked with specific measurement units relevant to the flow rate. For example, it could be in litres per minute(LPM) , gallons per hour(GPH), or other units depending on the application.
   • Users can directly observe the level of the fluid within the tube and read off the corresponding value from the scale. This makes it straightforward and user-friendly, as it doesn’t require any additional steps or calculations to interpret the measurement.
2. Reference Scale Flowmeter:
   • In this type of flowmeter, the scale on the glass tube is more generic and not specific to the fluid type or flow rate units. For instance, a 150mm scale might simply be marked from 0 to 15.
   • To understand the actual flow rate, users would need to refer to a conversion table or a chart. This table would translate the generic scale readings into specific flow rate values based on the fluid’s properties, the tube’s dimensions, and other factors.
   • This method allows for more flexibility since the same flowmeter can be used for different fluids or flow rates by changing the reference table. However, it adds an extra step for the user, as they must consult an external source to interpret the readings.

In summary, a direct read flowmeter provides immediate and specific readings, which are easier to use but less flexible. On the other hand, a reference scale flowmeter requires an additional step to interpret the readings but offers more versatility in different applications.

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