Why R160 Meters Equals To Class C Meters?
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Update time : 2025-11-26 15:31:14
The performance of water meter is displayed by the maximum permissible error and flowrate range.
China executed the standard of GB/T 778-1984(idt ISO4064:1977) before the year of 1996. Accordingly, the water meter showed:
1）Upper Zone：±2%，Lower Zone：±5%；
2）Accuracy Class: A、B、C、D；
3) Qmax=2Qn. Qn means normal flowrate, Qt means transitional flowrate, and Qmin means minimum flowrate.
China executed the standard of GB/T 778-1996(idt ISO4064:1993) before the year of 2007. Accordingly, the water meter showed,
1）Upper Zone：±2%，Lower Zone：±5%；
2）Accuracy Class: A、B、C、D；
qs=2qp. qp means normal flowrate, qt means transitional flowrate, and qmin means minimum flowrate.
Since the May of 2008, China changed the standard to be GB/T 778-2007(idt ISO4064:2005). Accordingly, the water meter showed,
1）Upper Zone：±2%，Lower Zone：±5% ；
2）Range: Q3 and Q3/Q1（or R）；
3）Q4=1,25Q3；Q3 means normal flowrate, Q2 means transitional flowrate, and Q1 means minimum flowrate.
4）Q2/Q1=1.6，Q4/Q3=1.25
Take DN15 (Class C) for example, qmin=0.015 m3/h，qt=0.0225 m3/h，qp=1.5 m3/h，qs=3 m3/h； According to ISO4064:2005，Q1=0.0156，Q2=0.025 m3/h，Q3=2.5 m3/h，Q4=3.125 m3/h。
Conclusion：
New Q3/Q1=160(R160）≈ Old Class C standard (is almost equal to ).
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