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Cold water meter AT 7420B, 7430B

Rotary piston volumetric type cold water meter with accuracy R160. For horizontal and vertical mounting. Low starting flow allows leakage detection. Pre-equipped for communication through Cyble module, pulse/data (M-bus)/ sensor, type AT 727CY.

Dimension rangeG 3/4 - G 2
Temperature rangeMax +50ºC


Article number Description Amount
AT 7430B15-2,5 RSK 5143847 DN 15, Q3= 2,5, Length 110 mm, Composite
AT 7430B20-2,5 RSK 5143848 DN 20, Q3= 4, Length 190 mm, Composite
AT 7420B15-2,5 RSK 5143842 DN 15, Q3= 2,5, Length 110 mm,
AT 7420B20-4 RSK 5143843 DN 20, Q3= 4, Length 190 mm
AT 7420B25-6,3 RSK 5143844 DN 25, Q3= 6,3, Length 260 mm
AT 7420B25-10 RSK 5143845 DN 25, Q3= 10, Length 260 mm
AT 7420B40-16 RSK 5143846 DN 40, Q3= 16, Length 300 mm
AT 7275CY-M RSK 4647915 Accessories, M-Bus sensor, DN 20-DN 25
AT 7275CY-WM RSK 4647916 Accessories, WM-Bus sensor
AT 7275CY-KLF1 Accessories, Pulse module 10 l/pulse
AT 7275CY-KLF10 RSK 4647918 Accessories, Pulse sensor 10 l/puls

Product information

Main facts

Dimension rangePNTemperature rangeMaterial

G 3/4 - G 2

16+2 °C to +50 ºCBrass
G 3/4 - G 116+2 °C to +50 ºCComposite

Range of application

Measurent of cold water through a display showing total consumed amount. Water meter with a piston measuring chamber design for cold water with aN accuracy MID R160 (Ratio) alternatively class C, which enables an extremely high accuracy even with low flows. Prepared for remote reading through separate Cyble-sensor with puls, M-Bus or wireless M-Bus. 
The meter should neither be used in cooling systems with additives of glycol or something similar, nor in industry applications or similar systems where there is a risk for powerful pressure loss, as an example where magnetic valves are mounted.

Program text

UGE.35 Water meter for flow, pipe mounted with digital display, accumulated worth.
Meter with a rotary piston measuring chamber design for cold water AT 7420B-....., Q3 .... m³/h, DN ...., PN 16, in brass. Prepared for mounting of pulse, M-Bus sensor type Cyble.

Meter with a rotarypiston measuring chamber design for cold water AT 7430B-....., Q3 .... m³/h, DN ....., PN 16, in composite. Prepared for mounting of pulse, M-bus sensor type Cyble.

Quality assurance

AT 7420B/7430B: MID-certificate including CE-marking.

Material specification

Body and insert ringAT 7420B: Brass CW617N
AT 7430B: composite PPA

Dimensions and weight

fd Qn 1,5
AT 7420
fd Qn 1,5
AT 7430
fd Qn 2,5
AT 7420
fd Qn 2,5
AT 7430
AT 7420B

AT 7420B

Q316 AT 7420B 
Connection after couplingDN15DN15DN20DN20DN 20


C 22262026425557
Connection, meterG 3/4"G 3/4"G 1"G 1"G 11/4"G 11/4"G 2"
Dimensions in mm, weight in kg

Function and design

AT 7420B is a water meter with a rotary piston measuring chamber design for cold water with an accuracy of R160. This means that the meter measures extremely thoroughly even at low flows. The design of the rotary piston meter allows mounting of the meter in any position with the exception of the meter body facing downwards. Piston meter AT 7420B doesn't have any after rotation. The meter has a self cleaning function and never goes against plus during its expiration time. 

Piston meter AT 7420B is provided with indication display for connection of remote reading modules type Cyble, with M-Bus, wM-Bus and pulse. See separate product sheet AT 7275CY.

Cyble is an inductive AMR-system (Automatic Reading System) for remote reading and transfer of readings from the water meter to the measurement collection system. TheCyble-sensor's rotational frequency is read inductively through a metal fitted dial indicator. 
Cyble-sensor can be mounted directly or at a later point, the meter's glass is prepared with attachment points with the help of the accompanying screws.

AT 7430B is made in composite. This means that the meter's manufacturing process is environmentally friendly through, among other things, less energy consumption and lack of heavy metalls like lead, zinc and copper. The material in the meter is 100% recyclable and has a high resistance against chlorine and other substances that can be found in drinking water. Composite has the same strength as brass but with a significantly higher elasticity, which make meter bodies in composite absorbing pressure stroke better without taking damage. The material's low weight also makes it easier to store, handle and transport.

Technical information AT 7240/7430A

Meteorological propertiesAT 7420B15-2,5AT 7420B20-4
AT 7430B15-2,5/7430B20-2,5
Q3Permanent flow, m3/h (meter size)2,54
RRatio (Q3/Q1) (Standard is R160)160160
Start flow, l/h. The value is for R400.<1<2
Q1Minimum flow, l/h (tolerance +- 5%). The value is for R160.15,625
Q2Boundary flow, l/h (tolerance +-2%). The value is for R160.2540
Q4Overload flow, m3/h3,15,0
The values in the table above are within the meteorological properties that are described in Swedac's regulations for MID 2004/22/EC and EN 14154 (The machine instrument directive)

Technical information AT 7420A

Meteorological properties7420B25-6,37420B25-107420B40-16
Q3Permanent flow, m3/h (meter size)6,31016
RRatio (Q3/Q1) (Standard is R160)160160160 
Q1Minimum flow, l/h (tolerance +- 5%)3963100
Q2Transitional flow, l/h (tolerance +-2%)63100160
Q4Overload flow, m3/h7,912,520
The values in the table above describes the meteorological properties in Swedac's regulations for MID 2004/22/EC and EN 14154 (Machine Instrument Directive). The gauges characteristic is well within these values.

Largest allowed margin of error according to Swedac's regulations

Flow rangeQ1- Q2(Qmin- Qt)± 5%
Q2- Q4(Qn- Qmax)± 2%


 The pressure drop in the water meter is not recommended to be higher than 0,5 bar (500 mbar) during permanent flow according to Svenskt Vatten's regulations P100.

Accessories and options

- Meter body in composite material - AT 7430B.
- Installation accessories, consoles and parallel couplings, se separate product sheet for AT 7358, 7539, 75360.

Remote reading module type Cyble
The meter is provided with an indicator that registers meter readings, flow direction in a remote reading module type Cyble, that can be mounted on the meter glass. The Cyble-module can be ordered with pulse 1/10/100 liter per pulse, wM-Bus or M-Bus. 

For more technical information see more in separate product sheet AT 7275CY.


Remote reading module type HRI with pulse output.
Pulse type transistor (open collector), polarity dependent
Pulse values (l/puls)*
AT 7275HRI-A4-D11
AT 7275HRI-A4-D10 (most common, "standard")10
AT 7275HRI-A4-D100100
* When there is need for other pulse values above standard see product sheet for AT 7275HRI.


Remote reading module type HRI med data output for M-Bus and Mini-Bus
in combination with the programmable pulse.

Pulse values by delivery* (l/puls)
AT 7275HRI-B4-D11
* Pulse values can be reprogrammed through service software MiniCom


Backflow protection
All water meters on incoming line for drinking water should, according to Boverket's building rules BBR and the Swedish standard SS-EN 1717, be provided with back flow protection. The cartridge check valve AT 7059 meets all the demands made on back flow protections and can be mounted in the meter's outlet.


Water meter sizeCartridge check valve including gasket
DN 20AT 7059A20
DN 25AT 7059M25
DN 40AT 7059M40


The meter can be installed in any position, with the exception of with the meter body facing downwards. To secure the long term operation, the installation should always be performed with a water meter console (see under accessories). Shut-off valves should always be mounted on the console's in and outlet.
The back flow protection after the water meter should be a protection module type EA (controllable check valve) AT 1159 with shut-off valve mounted on the input side, alternatively cartridge check valve AT 7059 should be mounted in the meter's output.
Before the water meter is mounted, it's important to flush the pipeline. Mount the meter with the flow direction arrow in the correct flow direction.
For installation of remote reading module, see product sheet 7275CY.

Maintenance and spare parts

During debitation of household consumption after the meter's registration should SWEDAC's regulations STAFS 2007:2 be followed, which means that recurring control (meter revision) with an interval of at most 10 years for Q3 4 and 5 years for Q3 10 and 16. Control and revision is performed by accredited control body. 


The meter is marked Itron Aquadis (AT 7420B) and Aquadis C AT 7430B and provided with a bar code of serial numbers. MID-approved meter is marked with Q3, R-value, manufacturing year, CE and serial number. 

How to order

Dimension DNMeter sizeArticle numberRSK-number
15Q32,5AT 7420B15-2,55143842
15Q32,5AT 7430B15-2,5 (composite)5143847
20Q34AT 7420A20-45143843
20Q34AT 7430B20-2,5 (composite)5143848
25Q36,3AT 7420B25-6,35143844
25Q310AT 7420B25-105143845
40Q316AT 7420B40-165143846


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