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Building and Industry

Sensus Model 620 Water Meter

620 is a high-precision, MID approved R400 volumetric water meter with a unique piston measuring chamber that detects even the lowest flow rates. You can choose between a register with an integrated wiper or a sealed copper-glass version. For a more comfortable readout, the 620 is prepared for AMR.

620 XX

Main characteristics

  • DN 15 to 40, PN 16
  • Unrivalled accuracy and measuring range
  • Small pressure drop
  • High resistance to impurities
  • Quiet operation
  • Suitable for cold water from 0.1 °C up to 50 °C
Cross selection


The 620 is a high precision meter. Due to its unique piston measuring chamber even drops of water are counted. A clear view is either provided through a register with an integrated wiper or a sealed metal/glass register that does not fog. For a faster and more comfortable readout the 620 is prepared for AMR. Due to our broad product range of system solutions you can adapt the 620 to all your AMR needs. Not least by its tamper proof design and its long life span you will be glad you used the 620.

Typical Marking

Available options

  • HRI electronic sensor (Pulse Unit, Data Unit)
  • Connectors
  • Non-return valve
  • Plastic and metal/glass register

Accuracy and reliability

Thanks to the advanced design of its measuring chamber the meter has an extreme low starting flow. It can be supplied with metrological seal according the MID regulation 2004/22/EC with a ratio R up to 315 (Q3 2.5 up to R400). Foreign matter present in the water is filtered out by either the tubular strainer on the inlet or the seat strainer. Particles can go through the meter

without damage; the patented elastic pivot enables the particles to pass between the piston and the measuring chamber. All the gears are situated in the dry register, which eliminates any risk of blockage due to suspended particles in the water. The 620 water meter keeps its metrological accuracy for many years of operation, even in very difficult working conditions.

Typical Head Loss Curve

Performance Data

Metrological characteristics in accordance with Measuring Instruments Directive

Performance Data


The display on 8 drums (5 for m3, 3 for litres) and 1 pointer ensures perfect readability. The lowest resolution is 0.05 litres. The dial has a central disc whose rotation indicates the passage of water. This indicator can be used to reveal a downstream leak. The plastic dial (1) is equipped with a wiper for optimum legibility under all conditions. The 620 water meter can operate in any position and its dry dial register can be rotated up to 350º. The dial can therefore be easily read under all conditions of use. As an option, the meter can be supplied with a metal/glass register, making it perfectly water-tight (IP 68).

Metrological characteristics

Metrological characteristics

HRI options

The dial of the meter is equipped as standard with a pointer able to activate the HRI sensor. By detecting the rotation of the pointer and its direction, the electronic circuitry of the HRI converts this into reliable electrical output signals.

There are two main variants of HRI:

1. HRI Pulse Unit (A-version)

This gives a pulse output which can be used for reliable counting of the volume.

2. HRI Data Unit (B-version)

The HRI Data Unit a is a data interface which supplies serial output according M-Bus standard EN13757 which can be connected to M-Bus converters.

The serial interface can also be used to configure a pulse output. This pulse output can be used alternatively to the serial output.

For more information please refer to the HRI datasheet.

SENSUS 620 with HRI

Installation tutorial:

How to Install HRI Sensor to Sensus 620 Water Meter - HERE

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Engineering Data*
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Product code

Sensus Model 620 Water Meter

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