DMS Ltd » European Directive 2004/22/EC http://www.dmsltd.com/blog Just another WordPress weblog Fri, 12 Aug 2011 09:55:01 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Measuring Instruments Directive http://www.dmsltd.com/blog/2010/07/measuring-instruments-directive/ http://www.dmsltd.com/blog/2010/07/measuring-instruments-directive/#comments Thu, 01 Jul 2010 14:44:58 +0000 Rob http://www.dmsltd.com/blog/?p=323 New European Regulation for Water Meters

European Directive 2004/22/EC is aimed at harmonising the regulations and classifications in the area of water metering across Europe. With effect from 30th October 2006 it replaces all European directives and national regulations making it necessary for all water meters to meet the standard of NF EN14154 and/or recommendation OIML R49.

So what does this mean in practice? Well it changes the baseline that is used to define the metering performance of a water meter.

comparing water meter measurement techniques

A water meter is now defined by:

  • Q3 : Continuous flowrate
  • R : Q3/Q1 ratio (where Q1 is the flowrate)

Secondary characteristics are:

  • Q2 : The transition flowrate given by Q2/Q1
  • Q4 : The overload flowrate given by Q4/Q3

This means that the possible values of Q3 (measured in cubic metres) and R are:

Q3 R
1.0 10.0
1.6 12.5
2.5 16.0
4.0 20.0
6.3 25.0
10.0 31.5
16.0 40.0
25.0 50.0
40.0 63.0
80.0
100.0
125.0
160.0
200.0
250.0
315.0
400.0
500.0
630.0
water meter flowrate calculation example
<div>
<h2>Model Approval</h2>
Model approval has been replaced by the <strong>EC type examination certificate</strong> which reinforces the requirements in terms of test benches and methods.</div>

Model Approval

Model approval has been replaced by the EC type examination certificate which reinforces the requirements in terms of test benches and methods.

Can you still buy and fit class A, B & C water meters?

Yes for 10 years at the most as products approved before the MID (Oct 2006) were approved for a 10 year period.

]]> http://www.dmsltd.com/blog/2010/07/measuring-instruments-directive/feed/ 0