Q: 2. Accuracy

This accuracy class refers to the maximum error of the flow meter. For example: the measuring range of the flow meter is 10m³/h. Then an accuracy of level 1.0 means that the difference between the measured value of the flow meter at any measuring point and the real flow rate is within plus or minus 1m³/h. For example, when the measured value of the flow meter is 5m³/h, the actual flow rate is between 4-6m³/h. Therefore, the higher the accuracy of the flow meter, the more accurately it represents the true flow rate. Level 0.5 is definitely more accurate than level 1.0.

Question 1

1. Instantaneous Flow vs. Cumulative Flow

Accepted Answer

There are two types of flow measurement: instantaneous flow and cumulative flow.

For example, the crude oil in the distribution station pipeline belongs to the custody transfer, or the continuous proportioning of the petrochemical pipeline, the process control of the production or production process, etc. need to measure the total amount. Occasionally supplemented by observation of instantaneous flow.

In some workplaces, instantaneous flow measurement is required to control the flow rate. Therefore, the selection should be made according to the needs of on-site measurement.

Of course, most of our Sino-Inst digital flow meters can display both instantaneous flow and cumulative flow simultaneously.

Question 2

2. Accuracy

Accepted Answer

This accuracy class refers to the maximum error of the flow meter.

For example: the measuring range of the flow meter is 10m³/h. Then an accuracy of level 1.0 means that the difference between the measured value of the flow meter at any measuring point and the real flow rate is within plus or minus 1m³/h.

For example, when the measured value of the flow meter is 5m³/h, the actual flow rate is between 4-6m³/h.

Therefore, the higher the accuracy of the flow meter, the more accurately it represents the true flow rate. Level 0.5 is definitely more accurate than level 1.0.

Question 3

3. Upper limit flow and flow range

Accepted Answer

Generally, we select a flow meter with the same pipe diameter. Each flow meter of a given diameter has its own corresponding measurement range.

If the flow meter's measurement range perfectly covers the minimum and maximum flow rates of the pipe, then you can simply select that flow meter.

If the flow meter's measurement range does not cover the pipe's flow rate, you will need to consider reducing or increasing the pipe section size. Please contact us for detailed recommendations based on our flow meter range table.

Question 4

4. Pressure loss

Accepted Answer

Pressure loss generally refers to the irrecoverable pressure loss that changes with the flow rate due to the static or movable detection element installed in the flow channel or the change of flow direction in the flow sensor.

Therefore, the flowmeter should be selected based on the pumping capacity of the pipeline system and the inlet pressure of the flowmeter to determine the allowable pressure loss of the maximum flow rate.

Question 5

5. Output signal

Accepted Answer

To facilitate remote monitoring and management of flow rates, most modern flow meters are equipped with signal outputs. These include options such as 4-20mA, RS485, pulse/frequency output, and HART, and even wireless communication via 4G/GPRS.

The specific signal output to be used needs to be confirmed with the backend monitoring equipment. The flow meter should be configured to provide the signal type that the backend equipment accepts.