Water Meters

A range of hot and cold rated multi-jet water meters is available in two categories.

  • Non Pulsed; to measure the throughput of water and enable readings to be logged as required. A reading of the total volume is available in m3 and litres.









  • Pulsed; used as part of Dosage Control Systems or directly with PULSAtron externally paced pumps. The "K" factor of the water meter specifies the volume of water passing through the meter between pulses. These meters also give the same volumetric readings as the non pulsed units.

    The K factor required must be specified at time of order as 1, 10, 100 or 1000.

 

 

 


Hot & Cold water meters - pulsed and non-pulsed - are available as follows.

Cold Water Meters - Maximum Operating Temperature 30oC
Maximum Operating Pressure 16 bar
Size Connections Flows
Ins mm Qn, Nom.
Flow Rate
(m3/hr)		 Qmax Max.
Flow Rate
(m3/hr)		 Qmin, Min.
Flow Rate
(m3/hr)
½" 15 Screw 1.5 3 0.03
¾" 20 Screw 2.5 5 0.05
1" 25 Screw 35 7 0.07
1¼" 30 Screw 6 12 0.12
1½" 40 Screw 10 20 0.20
2" 50 Screw 15 30 0.45
2" 50 Flange 15 30 0.45
2½" 65 Flange 25 50 0.75
3" 80 Flange 40 80 1.20
4" 100 Flange 60 120 1.80
5" 125 Flange 100 200 3.00
6" 150 Flange 150 300 4.50
8" 200 Flange 250 500 7.50


Hot Water Meters - Maximum Operating Temperature 90oC
Maximum Operating Pressure 16 bar
Size Connections Flows
Ins mm Qn, Nom.
Flow Rate
(m3/hr)		 Qmax Max.
Flow Rate
(m3/hr)		 Qmin, Min.
Flow Rate
(m3/hr)
½" 15 Screw 1.5 3 0.03
¾" 20 Screw 2.5 5 0.05
1" 25 Screw 35 7 0.07
1¼" 30 Screw 6 12 0.12
1½" 40 Screw 10 20 0.20
2" 50 Screw 15 30 0.45

Water Meter Sizing

Each size water meter has a typical measuring range. If the meter selected is subjected to flows outside of this range, it will not provide accurate readings or pulses.

Flow rates are characterised by

  • Nominal Flow Rate : Qn
  • Maximum Flow Rate : Qmax
  • Minimum Flow Rate : Qmin
  • Transitional Flow Rate : Qt

Any flow below Qmin will be inaccurately measured, even if the meter total increases or pulses are transmitted.

Measuring accuracy between Qmin and Qt is ±5%

The optimum accuracy is ±2% which is achieved between Qt and Qmax.

However, head losses can increase the inaccuracy between Qn and Qmax.

Qmax should only be a maximum flow rate which occurs between 5 to 10% of operation, i.e. 3 to 6 minutes per hour. Running a meter at Qmax for longer periods than this will result in premature wear and reduced operating life.

Thus match the actual flow rate as near as possible to Qn.

Never select a meter on pipe size only.