Range issue

These are the minimum and maximum measurement ranges!

Under the condition of meeting the required accuracy level, it is not possible to measure flow rates lower than 1.6 l/h or higher than 16 l/h. Since your normal flow rate is quite low and does not reach 16 l/h, it is recommended to use a flow meter with a DN10 size

Is there a DN15 range available in the selection options for rotor flowmeters, with a flow rate range of 1.6–16 L/h? Can it measure flow rates as low as 1.1 L/h, at a normal level of 3.0 L/h, and up to 5.0 L/h? Can it measure accurately? What do 1.6 and 16 represent respectively? The range of the rotameter includes DN15, with a flow rate of 1.6–16 L/h; this means that the nominal diameter of the rotameter is DN15, and its corresponding flow rate range is 1.6–16 L/h. In other words, a rotameter with a nominal diameter of DN15 can maintain accuracy when measuring within the range of 1.6–16 L/h; it provides inaccurate readings or fails to give any readings below 1.6 L/h. Similarly, it also gives inaccurate readings or fails to measure at values above 16 L/h, and there is a risk of damaging the instrument. The normal and maximum values measured by the owner are within the range, so the accuracy is fine; however, the minimum value exceeds the lower limit of the range, resulting in inaccurate measurements. However, the minimum nominal diameter of rotary flow meters is DN15; there are no smaller sizes available. If the data measured by the original poster rarely reach the lower limit, using this flow meter is fine; otherwise, an electromagnetic flow meter should be used (again, it depends on whether the conductivity meets the requirements), while mass flow meters are too expensive and not necessary.

1.6-16 represents the range ratio; 0-1.6 is the dead zone during which no flow can be measured

Personal understanding: 1.6–16 L/h is the measurement range of this instrument; the lower limit of measurement is 1.6 L/h, while the upper limit is 16 L/h. For flow rates that range from a minimum of 1.1 L/h, a normal value of 3.0 L/h, to a maximum of 5.0 L/h, the minimum flow rate to be measured is below the instrument’s lower measurement limit, and the maximum flow rate is far below the instrument’s upper measurement limit. This results in significant measurement errors when using this instrument. It is advisable to choose a value such that the minimum measurement falls above the instrument’s lower measurement limit, with the typical value being around half of the instrument’s measurement range, and the maximum measurement being around two-thirds or three-quarters of the range.

As long as the required accuracy level is met, the minimum flow rate is 1.6 l/h and the maximum flow rate is 16 l/h. Your normal flow rate is quite low, not even reaching half of 16 l/h; it is recommended to choose a flow meter with a smaller diameter

1.6-16 indicates the range