- A flexible coupling can be used to ensure a stress-free installation.
- The use of a filter, placed upstream of the meter, is advisable in gas with high particulate
content. See § 3.2.
Before installation:
- The piping upstream of the meter should be free of dust.
- Remove the protective caps.
- Ensure that the direction of gas flow corresponds with the arrow situated on the meter body.
- Check that the impellers turn freely.
3.2 Filtration
Rotary meters work better if there are no particles within the gas. It is advisable therefore to filter
the gas upstream of the meter. Recommended level of filtration 100 µm or better.
While the meter is in service, periodically check the cleanliness of the filter, especially in the case of
a new installation or after work has been performed on the upstream piping.
3.3 Lubrication
3.3.1 General
Choose the lubricant according to the operating conditions. This lubricant should be neutral and non
detergent. Important:
- A lack of lubricant could cause premature wear of the meter.
- An excess of lubricant can also induce problems. A surplus of lubricant can contaminate the
measuring chamber, may degrade the metrology and cause damage to the bearings and the
impellers due to the mixture of lubricant and small impurities contained in the gas.
- Always drain the end-covers before moving the meter.
3.3.2 Choice of lubricant
Viscosity: The viscosity has been calculated to ensure mechanical and metrological performance of
the meter.
Commercial references: Annex 3 contains a list of commercial lubricants usable for industrial gas
except gases such oxygen and halogens. For other gases, please consult us.
The viscosity of the lubricant varies with the temperature. In Annex 4 is indicated the temperature
range compatible with a lubricant of viscosity as indicated by ISO3 448 at 40°C.
3.3.3 Capacity of end covers: See Annex 5
3.3. 4 Filling and draining procedure
See Annex 6 for the location of fill, drain plug and sights.
Both front and rear covers must be filled with lubricant, except for the DN 40 which is equipped with
an internal pipe.
Filling and draining operations should be carried out with the meter installed in the piping, but not
pressurised, though the use of Pete's Plugs may allow lubricant levels to be °topped up" while the
meter is pressurised (up to 20 bar). See Annex 7.
The level is correct when the lubricant passes through the centre of the sight.
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