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Elvaco offers temperature and humidity sensors, both for indoor and outdoor environments. The product line enables simple and cost-effective metering, which enables a more effective use of energy and a better real-estate climate. Sensors are available with M-Bus, Wireless M-Bus or LoRaWAN communication, as well as with or without display.  


Indoor temperature sensor, Wireless M-Bus

The CMa12w is a one-way wireless M-Bus temperature sensor for indoor use. The sensor offers high accuracy, user-friendliness and a long battery-life (up to 15 years). Readout and configuration are easily performed via wireless M-Bus or by using a smart phone (via NFC).


Casing material:
ABS UL94-V0, white
Protection class:
Dimensions (w x h x d):
80 x 80 x 25 mm
75 g

Electrical connections

Supply voltage:
Battery, life span 15 years (at 15 °C to 25 °C)

Electrical characteristics

Environmental specifications

Operating temperature:
-10 °C to +50 °C
Operating humidity:
0 to 95 %, no condensation
Operating altitude:
0-2000 m
Pollution degree:
Degree 2
Usage environment:
Storage temperature:
-40 °C to +85 °C
Measurement range, temperature sensor:
-20 °C to +55 °C

Temperature sensor, margin of error

Temperature: 5 °C to 55 °C:

Humidity sensor, margin of error

User interface

Momentary values:
Temperature, status
Historic values:
Average value over the last hour and last day


Wireless M-Bus

Integrated M-Bus Master

Wireless M-Bus Receiver

M-Bus slave interface

Frequency, Wireless M-Bus:
868.95 MHz
Transmit power:
10 mW
Transmit interval:
3 minutes
Wireless M-Bus modes:
C1 (default) and T1


Data storage (examples)

Mobile Network

Fixed Network (Ethernet)



EN 61000-6-2, EN 61000-6-3

Connections and Interfaces


For downloads, please visit our support site at: https://support.elvaco.com

Our website has gathered all resources you need to update, tune and troubleshoot your installations, such as:

  • Latest software versions
  • FAQs
  • Guides
  • In-depth technical information
  • Support forum

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