Water meter differences

[reb78]

Can anyone explain the difference between these two meters? The specs all look the same except one is R160 and one is R400. I cant get my head around what the R figures actually mean or if they are important!

https://www.bellflowsystems.co.uk/diehl-altair-v4-volumetric-r160-water-meter-cold-dn20-brass.html

https://www.bellflowsystems.co.uk/diehl-altair-v4-volumetric-water-meter-r400-cold-dn20-brass.html

 

[rtcosic]

From this website

Low Flow Sensibility and accuracy
When purchasing a water meter, it will be necessary to choose the metrological working range. This parameter does not define the accuracy of the water meter but the lower flow sensibility.

The metrological working range is defined by the Ratio (This value is the relation between Working flow / Minimum flow).

The higher the “R” Ratio, the greater sensitivity the meter has for measuring low flow rates.

The standard values of the R ratios in water meter are the following*:

• R40, R50, R63, R80, R100, R125, R160, R 200, R250, R315, R400, R500, R630, R800 y R1000.
  
  
  

 

[reb78]

Thanks. Dont know how I didnt find that. I wonder why they have an R160 and an R400 for the same price? Whats the point of the R160 if the R400 is no more to buy!