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The importance of correct flow sensor dimensioning

The importance of correct flow sensor dimensioning
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The importance of correct flow sensor dimensioning - 1

The importance of correct flow sensor dimensioning We have seen a number of orders for under-dimensioned flow sensors. In sales situations it might be tempting to deliver under-dimensioned flow sensors to try to lower the price. The importance of correct flow sensor dimensioning is often devalued, and the consequences are severe. That is why we constantly focus on the pipe dimension matching the flow rate in order to operate the system at the lowest cost while ensuring the required supply of energy. This brings up the question of when a flow sensor is considered to be under-dimensioned. Flow sensors dimensioned to a continuous operating flow between qp (nominal flow) and qs (maximum flow) are under-dimensioned. The correct dimensioning parameter of the flow meter is the nominal flow (qp m³/h). According to the authorities the range between qp and qs is only to be used briefly - less than 1h/day or 200 h/year. Choosing an under-dimensioned flow sensor might save you some money at the time of purchase. However, operating flow sensors above qp causes higher pressure losses and demands an increase of the static pressure in the system to suppress cavitation. Both incidents will have serious consequences: Increased operational costs due to the need of a bigger or additional circulation pump, increased costs to balance the system, an unstable system, and in worst case the installation cannot supply the necessary volume and energy to obtain the required comfort temperatures.

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The importance of correct flow sensor dimensioning - 2

How to dimension your flow sensor correctly When dimensioning your flow sensor, two major conditions must be stated: pipe dimension and maximum flow of the system. Regarding pipe dimension, going one dimension up or down in meter size will in general cause no problems, as long as the second parameter, the maximum flow of the system does not exceed the nominal flow of the flow sensor. The static pressure at flow sensor outlet must at all times be above the minimum requirement. Please find information on qp, dimension size and minimum static pressure in the Technical description at:...

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