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Difference between single and multi-jet meters

In single-jet water meters the principle of operation is given by the incidence of a single tangential stream of water with a turbine mounted in a radial position within the body of the meter. The rotation of the turbine transmits the motion to the reading mechanism allowing the measurement of the volume of water passing through the meter. The rotation speed of the turbine is proportional to the water flow in inlet and any variation in the relationship between the characteristics of the turbine and the water flow would entail an alteration of the error curve of the meter. In multi-jet water meters the principle of operation is to force the passage of the inlet water flow through a series of ducts open in a capsule called distributor, containing the turbine. The entrance of the water through the ducts generates a series of symmetrical water jets that impact the turbine keeping it in perfect balance.

Difference between dry-dial, wet-dial and semi-dry dial with protected rolls meters.

The dry dial water meter has the reading mechanism hermetically separated from the water flow chamber. In this case the transmission to the reading mechanism gears takes place via magnetic coupling between the turbine and the reading mechanism itself. The wet dial water meters has the reading mechanism the reading mechanism completely immersed in the water and the transmission is direct from the turbine to the gears of the mechanism itself. The semi dry dial water meter has the reading mechanism completely immersed in the water but the dial is partially separated from it remaining dry and the rollers are protected in a sealed capsule. The transmission from the turbine to the gears of the reading mechanism is direct.

MEASUREMENT RANGE AND MAXIMUM TOLERATED ERROR

As requested by the 2004/22 / EC (MID) Directive and by the norm EN14154, the measuring range of a water meter is determined by the ratio between the value of its permanent flow rate (Q3) and the one of the minimum flow rate (Q1). The meter can measure for short periods, without deteriorating, at the maximum flow rate (Q4).
As an example, if we find reported on the dial of a meter the information Q3 = 2.5 m3 / h R100H, R50V, this means that this meter can be used, when installed horizontally, up to a minimum flow rate of 25l /h while, if installed vertically, up to a minimum flow rate of 50l / h. The overload flow is always 1.25 * Q3, in this case therefore, equal to 3,125m3 / h.

The MPE, positive or negative, on volumes between the transitional flowrate (Q2) (included) and the overload flowrate (Q4) is:
2% with a water temperature ≤ 30 ° C
3% with a water temperature > 30 ° C.
The MPE, positive or negative, on volumes between the minimum flowrate (Q1) and the transitional flowrate (Q2) (excluded) is equal to 5% regardless the water temperature.

After how many years do water meters need to be verified/recalibrated?

Metrological checks following the initial verification of water meters are prescribed by the rules in force in the country where the meters themselves are used. In Italy, for example, the Decree 155 of October 30, 2013 states that the meters must be reassessed as follows.

Mechanical water meters: within 10 years
Water meters of static and Venturi type: within 13 years

How do I install/configure the water meters?

For proper and safe installation and configuration of the B METERS products please refer to the installation and software manuals specific to each product, available in the download area.
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