Flow meters EM-1
Electromagnetic Water Meter
A battery-powered electromagnetic meter for district metering.
- Outputs
- RS485, GPRS, NB-IoT
- Standards
- ISO 4064
- Protection class
- IP68
- Measured media
- Water
Documents
Overview
Why buyers choose it
-
Nothing in the bore
No restriction and no wear, so the meter neither costs head nor drifts with mileage.
-
Measures both directions
Backfeed between districts is recorded rather than reported as a loss in one zone and a saving in the other.
-
Ten-year battery
It goes in a chamber with no mains supply, which is where district meters actually live.
-
Says when it is wrong
Self-diagnosis and data protection, so a fault surfaces instead of producing plausible numbers.
In detail
An electromagnetic meter measures the voltage a conductor generates as it moves through a magnetic field — here, the water itself. There is nothing at all in the bore: no impeller, no restriction, no wear, and no pressure loss beyond the pipe's own friction.
That makes it the instrument of choice for district metering, where the meter sits on a main that must not be throttled and where the flows of interest span a very wide range. Starting flow is ultra-low, and the meter can be supplied for accuracy classes down to class 1 where the application justifies it.
It measures in both directions, which on an interconnected network is not a luxury: a district that backfeeds its neighbour overnight will otherwise report the transfer as a loss. The meter also self-diagnoses and protects its stored data, so a fault is reported rather than silently producing plausible numbers.
Battery life is over ten years, so the meter can be installed in a chamber with no supply, and it reports over RS485 or wirelessly by GPRS or NB-IoT. It is sealed to IP68 for permanent submersion.
Technical specifications
Metrological
| Measuring principle | Electromagnetic, bidirectional |
|---|---|
| Accuracy | R160, R250, R400 or R630; class 1 to order |
Hydraulic
| Measured media | Water |
|---|
Electrical
| Power supply | Internal battery, life over 10 years |
|---|---|
| Outputs | RS485, GPRS, NB-IoT |
Communication
| Communication | RS485 wired; GPRS or NB-IoT wireless |
|---|
Environmental
| Protection class | IP68 |
|---|
Approvals
| Standards | ISO 4064 |
|---|
Parts
Parts of an electromagnetic meter
How a meter of this type is built, and what this model is made of.
-
Transmitter with display
Converts the electrode signal into a flow reading and shows it.
-
Cable entry
Where the signal and power cables enter the transmitter housing.
-
Field coil
Generates the magnetic field the flow induces a voltage across.
-
Electrodes
Sense the voltage induced by the flowing liquid.
-
Insulating liner
Isolates the measuring signal from the metal tube wall.
-
Measuring tube
Carries the flow through the magnetic field.
-
Earthing rings
Reference the liquid to the pipework's earth potential.
-
Flanges
Bolt the meter to the pipeline.
Download centre
Everything you need to specify.
Documents for the Electromagnetic Water Meter.
-
Download PDF (Opens in a new tab)
Technical datasheet
Specifications and dimensions.
More from Flow meters
View all Flow meters
Flow meters
Battery-Powered Turbine Flow Meter
- Sizes
- DN15 to DN200
- Accuracy
- ±1% of full scale from 20 to 100% of flow; linearity ±1%
