- Rotary meters are volumetric, and are used by customers needing very accurate measurement when gas flows can be low or irregular.
- They offer excellent long term  meteorological stability under all installation conditions.

- Itron rotary meters are used when very accurate measurement is required in circumstances where the gas flow can be low or irregular. Because of its volumetric principle, the Delta™ meter's metrology is not influenced by installation conditions. Consequently, it can be used to build very compact stations without installing a straight pipe inlet in front of the meter. Delta meters are approved for fiscal use.