Calibration Flow Meter - Weighing Method (3)

International Standard 4185

Measurement of liquid flow in closed conduits -

Weighing method

First edition - 1980-12-15

Ref. No. ISO 4185-1980 (E)

Dynamic weighing

The principle of the flow-rate measurement method by dynamic weighing (see figure 1D for a schematic diagram of a typical installation) is :

• to let the liquid collect in the tank to a predetermined initial mass, when the timer is then started;
• to stop the timer when a predetermined final mass of collected liquid is reached.

The flow-rate is then derived from the mass collected, the collection time and other data as discussed in clause 5 and annex A.

Figure 1D - Diagram of an installation for calibration by weighing

 (dynamic method, supply by a constant level head tank)