Electronic radio module E-RM 30 for residential water meters Apator Powogaz

Data reading

E-RM 30 rod antenna features a very good efficiency. Due to this high-quality signal it is possible to read data without entering the building even in case of installation in the shaft of multiple-storey building. Data reading can be made by billing company employee using mobile receiving unit. Data can be also read by central reading system CRS 40 permanently installed in the building if required.

If radio heat cost allocators E-ITN 30 are also used, data are read simultaneously.

User control

Every user can control current value on analogue dial of water meter.

Protection against cheating

In contrast to the traditional water meter, radio module can E-RM 30 distinguish the direction of water flow - it is thus possible to detect manipulation with water meter (its turning).

The radio module can be of course secured by conventional mechanical seal against its removal from the water meter. The radio module is equipped with an electronic seal that allows you to identify unauthorized manipulation and record the exact date. Information about such manipulation is transmitted in radio signal.

Month consumptions for forward and back flow for past 12 months can be read from the radio module memory via infra-red interface.

Water meters Apator Powogaz are extraordinary protected against the effects of magnetic field.

Technical data

Radio module E-RM 30
Working temperature 5 to 50 °C
Calendar functions consumption for past 12 months (both for normal flow and back flow)
Data reading radio and infra-red interface
Protection against cheating back flow detection - module detects direction of water flow
electronic seal records manipulation date when uninstalled
possibility to mechanically seal radio module to water meter
Data backup daily backup of measured values including real time
Function control automatic
Dimensions 70 x 43 x 69 mm
Power supply lithium battery 3,0 V
Material polycarbonate
Protection IP 64
Mechanical and environmental class B
Electromagnetic class E1

Radio parameters
Operating frequency 868 MHz
Transmitting power < 5 mW
Transmission length 8 ms
Transmission range up to 500 m (without entering the building, with additional panel antenna).
Rem.: It is necessary to consider that all metal parts of construction (armouring, lifts, switch rooms, etc.) can negatively affect the range of radio signal.
Data coding yes


The radio module is intended to be used in an assembly with the undermentioned water meters Apator Powogazin any position.


cold water
hot water
Nominal diameter  [mm] 15 20
Permanent flow rate Q3 [m3/h] 1,6 2,5 4
Overload flow rate Q4 [m3/h] 2 3,125 5
Minimum flow rate Q1
(horizontal / vertical installation)
[dm3/h] 16 / 32
20 / 40
25 / 50
31,25 / 62,5
40 / 80
50 / 100
Transitional flow rate Q2
(horizontal / vertical installation)
[dm3/h] 25,6 / 51,2
32 / 64 
40 / 80
50 / 100
64 / 128
80 / 160
Maximum permissible error
(Q2 to Q4)
  ±2 %
±3 %
Max. working temperature [°C] 30
Max. working pressure   1,6 MPa (16 bar)
Length [mm] 110 130
Conformity   MID, EN 14154, OIML R49
Accuracy calss MID R100 - H, R50 - V
R80 - H, R40- V

Dimensional drawings

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