Rev. 0 - 05/11/2020
OPERATING MANUAL
OPERATING MANUAL
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11. VOLUMETER MEASUREMENT SYSTEM FOR VOLUME FLOW RATE
11.1 General description of the system
The Volumeter system is a measurement device for the volume flow rate of an operating fan.
A correct and easy measurement of the fan volume flow can satisfy a variety of requirements, from acceptance testing of a new
plant, at start-up time, to the automatic control of complex systems.
The Volumeter system differs from other measurement devices, like Wilson grids and Venturi-meters, because it does not need a long,
regular-section piece of straight duct. It can be easily integrated in the structure of a standard A.H.U. without special modifications.
A complete Volumeter system is made of two parts:
1
2
1) A modified fan, with special pressure probes located on each inlet nozzle.
2) A Pressure Transducer code K43198, located close to the fan and connected with pipes to the fan and with an electrical cable to
a dedicated display (as shown in the following scheme).
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The Volumeter device is based on the Venturi principle, sensing the suction which is produced, in the throat section of the fan inlet
nozzle or bell-mouth, by the airflow entering the fan.
The achievable precision from a complete and appropriately calibrated system (+/-5%) corresponds to the level of precision normally
required for industrial measurements on a running plant.
The characteristic architecture of the Volumeter system allows the use of those components only needed by the specific application,
limiting the cost of the equipment when the design requirements are simpler. The three components described above may be used
or not, according to the functionalities required from each measurement system.
