Gas meters

TYPES, DATA, DETERMINATION OF THE MAXIMUM LEVY SIZING AND INSTALLATION

Gas meters

The models of gas meters fuel currently available and usable, are essentially fall into four main families:

 1. A membrane
 2. ultrasonic
 3. A rotary piston
 4. A turbine

 The counter diaphragm (or diaphragm) and the ultrasound are intended for the measurement of medium and low capacities, with variable trend over time, while the use of the other two models is designed to measures of flow medium and large, characterized by trends more constant over time. The latter normally are suitable for industrial uses or central heating systems where the burners have fairly constant consumption.
The ultrasonic meters are the most recent approval, have the great advantage of having small dimensions and an electronic part that allows integrated management of data, are used exclusively in domestic use (maximum capacity up to 10 m³ / h).
Recall also that the counters membrane and the counters are to rotoidi meters of the volumetric type, as by measuring physically isolating a constant volume and known gas at each rotation (cyclic volume), while, as can easily understand, the counter ultrasonic and the turbine meters are non-volumetric. The four families of gas meters above are regulated by specific technical standards, European harmonization, which define the requirements and test methods for the construction, performance requirements and safety aspects. The rules in question are:


  UNI EN 1359 Gas Meter Diaphragm
  UNI EN 14236 Measurement of ultrasonic domestic gas
  UNI EN 12480Gas rotary piston
  UNI EN 12261 meters of gas turbine


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