Water meter: Qn 2.5
A typical point of controversy when billing operating costs is again and again the water consumption. It is often claimed that the water meter was read incorrectly, the water meter runs imprecisely or the water meter Qn 2.5 is dimensioned too low for the property.
Qn 2.5 stands for the nominal flow rate
The Qn behind the water meter stands for the so-called nominal flow rate.
Qn 2.5 means nothing else than that the water meter has a nominal flow rate of 2.5 cubic meters in one hour, and at the same time serves as a kind of device identifier. In addition to the flow rate of 2.5 cubic meters per hour, there are of course also larger-sized water meters.
- The three water meters Qn 2.5, Qn 6 and Qn 10, which are usually installed in housing, are installed depending on the size of the property to be supplied with drinking water. In most cases, these are so-called single-jet impeller meters. This means that a jet flows through the meter, driving the impeller at different speeds depending on the amount of water removed. The impeller measures very low consumption values quite accurately.
- The water meters are calibrated for certain periods of time. Cold water meters usually have a six-year calibration period. Due to the higher demands, the calibration periods for hot water meters are only five years.
- Every water meter must be replaced free of charge by the responsible water supply company after the calibration period has expired.
- The water meter is usually installed directly at the house connection of the drinking water pipe and must not be installed above other pipes of any kind.
If you have your own water meter for your residential unit, it's worth it ...
Read a water meter correctly
- Open the protective cover usually present on the Qn 2.5 water meter.
- You will usually see a rolling counter and one to four small clocks. In this case the counter shows the places before the decimal point.
- The clocks show the decimal places from right to left. A factor is given above each clock. For example, the factor 0.1 means that this is the first decimal place and represents a unit of 100 liters. The factor 0.01 means 10 liters etc.
- If your water meter Qn 2.5 shows only one counter, then the black digits show the places before the decimal point and the red digits show the places after the decimal point.
- If you have a Qn 2.5 water meter with a counter and clocks, then simply read off the digits in front of the decimal point on the counter from left to right. Assuming your counter shows 375 then you have 375 cubic meters water consumed. The decimal places are rarely required. If you do, read the clocks in sequence from right to left.
- In the case of a water meter that is only equipped with a counter, simply read the numbers from left to right. Assuming it shows 467 with the black numbers and 941 with the red numbers, then you have consumed 467,941 cubic meters of drinking water.
As you can see, it is very easy to read your Qn 2.5 water meter.
