Elvaco CMa20w User manual

INTRODUCTION
CMa20w is a wireless M-Bus communicating temperature and humidity
sensor for outdoor use.
For a complete description of the product or for information in Swedish,
visit the Elvaco AB website, www.elvaco.com.
OVERVIEW
CMa20w
Outdoor wireless M-Bus temperature and humidity sensor
1. Service
connector
2. LED
3. Push button
4. Sensor pipe
5. Wall mounting
MOUNTING
Mount the product in a weatherproof location to avoid that direct
sunlight or rain affects the sensors. The product should be mounted
straight vertically and horizontally with the sensor pipe (4) downwards.
Use the holes (5) when mounting on wall.
IMPORTANT! To assure correct sealing when assembling the lid, first
fixate the lid by pressing on all 4 corners firmly (see picture to the
right). The two screws are used to secure the lid once pressed into
place, do not use screws to put lid into place!
INSTALLATION
The product can be installed and enabled in two modes. Please advise
your project manager which operation mode is used in your project.
Unencrypted mode: Meter data is sent unencrypted and no encryption
key is needed to decrypt the data.
1. Press and hold button (3) for 5-10 seconds until LED1 (2) flashes
quickly.
2. Release button (3).
Encrypted mode: Meter data is sent in encrypted mode and the
encryption key is needed to decrypt the data.
1. Press and hold button (3) for 10-22 seconds, until LED1 (2) flashes
slowly.
2. Release button (3).
* If the button is released in this mode, the CMa20w will return to inactive
mode. This also applies if the button is pressed down for longer than 25
seconds.
IMPORTANT 1
Make sure that the product is activated by pressing the button (3)
during normal operation. If the product is activated in unencrypted
mode, LED1 will flash quickly 5 times. If the product is activated in
encrypted mode, LED1 will be illuminated for 1 second.
IMPORTANT 2
During the first 24 hours after activation it is possible to change
encryption mode between encrypted and unencrypted. See section
“Installation” above.
OPERATION
The product will automatically, after the installation procedure, send
C1 messages every 3rd minute containing sensor data, such as
instantaneous temperature and humidity. The product will also send
product status information, containing age indication of the battery and
other relevant information.
SAFETY
The warranty does not cover damage to the product caused by usage
in any other way than described in this manual. Elvaco AB can not be
liable for personal injury or property damage caused by usage in any
other way than described in this manual.
Release SW1 for
unencrypted mode
LED1 fast flash
Release SW1 for
encrypted mode
LED1 slow flash
6 s 5 s 12 s2 s*
WIRELESS M-BUS
The product is delivered with the radio turned off. The radio must be
manually switched on during the installation procedure. The product will
not be activated until the installation procedure is started.

© 2016, Elvaco AB. All rights reserved. The documentation and product are provided on an “as is” basis only and may contain deficiencies or inad-
equacies. Elvaco AB takes no responsibility for damages, liabilities or other losses by using this product. No part of the contents of this manual may
be transmitted or reproduced in any form by any means without the written permission of Elvaco AB. Printed in Sweden.
CMa20w Quick manual A4 English
Document id: 1090092
Version: 6.0
Product Part number Description
CMa20w 1050023 Wireless M-Bus communicating
temperature and humidity sensor
for outdoor use.
ORDERING INFORMATION
CONTACT INFORMATION
Elvaco AB Technical support:
Phone: [phone]
E-mail: support @elvaco.com
Online: www.elvaco.com
TECHNICAL SPECIFICATIONS
Mechanics
Protection class IP65
Dimensions 110x100x52 mm
Weight 140 g
Antenna Wireless M-Bus Internal
Mounting Wall mounted
Electrical
Power supply Battery, 12 years
Environmental
Operating temperature
range
-20 °C to +45 °C
Storage temperature range -40 to +30 °C
Operating humidity 0 to 95 %RH no condensation
Sensor accuracy
Temperature 10 to 30 °C +/- 0.2 °C
Humidity 10 to 90 % RH +/- 2 % RH
Wireless M-Bus
M-Bus standard EN 13757-4:2013, mode C1b
M-Bus commands SND_NR
Values Temperature, humidity, min/max/
average, momentary
RF power 25 mW
Frequency 868.95 MHz
Approvals
EMC EN 61000-6-2, EN 61000-6-3
Factory defaults
Transmit interval 3 minutes
Encryption mode Optional unencrypted/encrypted
(128 bit AES)
Delivery mode Inactive (not transmitting)
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