Issues with the meter’s rated flow rate and maximum flow rate?

The rated flow rate is the flow rate that the manufacturer states the flow meter can achieve, at which flow rate the measurements taken by the flow meter are accurate. The maximum flow rate is the highest flow rate that can be achieved during use, and it is lower than the rated flow rate.

Agree with what was said above; when choosing a flow meter, it is advisable for its rated flow to be 60%-80% of the maximum flow rate

The friend on the 2nd floor gave an incorrect answer. The rated flow rate refers to the flow value of the fluid under specified operating conditions, while the maximum flow rate is the highest flow that the flow meter can measure under those same specified conditions. Generally, the rated flow rate is selected to be 50~70% of the maximum flow rate.

The rated flow rate is the flow rate that the manufacturer states the flow meter can achieve, at which flow rate the measurements taken by the flow meter are accurate. The maximum flow rate is the highest flow rate that can be achieved during use, and it is lower than the rated flow rate.

Just think of it as the rated voltage; if it’s exceeded, the circuit gets disconnected: lol

The flow rate is measured most stably and accurately when it is at 60-70% of the maximum value.

The reply above is already very detailed, so I won’t say anything more

May I ask which manufacturer’s flow meter it is? It seems that Emerson’s flowmeters don’t have a concept of rated flow rate. Additionally, a brief note on flow rate: the maximum flow rate indicated on typical mass flow meters corresponds to a flow velocity of around 20 m/s. However, the calibration devices used by various companies that comply with **calibration standards can achieve at most 11–12 m/s; even those from Emerson cannot reach this level. Therefore, the maximum range indicated on mass flow meters is, in the vast majority of cases, determined through theoretical calculations or by referring to values from others. Of course, this does not affect performance in most situations, as the actual flow velocities under operational conditions are far below 11 m/s. But if there is indeed a high flow rate, it is still recommended to have the manufacturer perform a real-flow calibration. If it is a water-related device, the manufacturer has the capability to do it.

Generally, for maximum flow meters, a value between 1/2 and 2/3 of the rated flow is the most reliable choice