Elvaco CMa12w Installation guide

INTRODUCTION
CMa12w is a 1-way wireless M-Bus communicating temperature
sensor for indoor use.
For a complete description of the product or for information in Swedish,
visit the Elvaco AB website, www.elvaco.com.
OVERVIEW
CMa12w
Indoor wireless M-Bus temperature sensor
1. LED 1
2. Push-button (SW1)
3. Serial number (secondary
address) and article number
4. Do not use for mounting
MOUNTING
When mounting the CMa12w, avoid rooms with a lot of supplementary
heat, such as kitchens or south facing rooms. Position the sensor
away from direct sunlight. Avoid placing on an external wall or near an
external door. Make sure that the sensor is not positioned closer than
1 m from the nearest radiator and at least 1.5 m above the floor.
The CMa12w can be mounted directly on the wall, or over a mounting
box Ø70 mm. If the CMa12w is placed over a conduit pipe, it is
recommended to fill the pipe to prevent air flow which could affect
accuracy of the values.
Remove the rear cover to be able to press the installation button SW1
(2).
IMPORTANT
• Do not use mounting holes (4) as shown in overview.
• Turn the rear cover as shown in the overview.
• Do not mount the product inside a steel cabinet, which will
dramatically lower the possibilities to connect to a master.
• If the product should be demounted from the wall, use a
screwdriver to separate the product from the rear cover. The
screwdriver should be inserted carefully in the upper part of the
holes as shown in the figure at the top of next column.
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.
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 SW1 (2) for 5-10 seconds, until LED1 (1)
flashes quickly.
2. Release SW1 (2)
Encrypted mode: Meter data is sent in encrypted mode and an encryption
key is needed to decrypt the data.
1. Press and hold button SW1 (2) for 12-25 seconds, until LED1 (3)
flashes slowly.
2. Release SW1 (2).
* If the button is released in this mode, the CMa12w will return to inactive
mode. This also applies if the button is pressed down for longer than 25
seconds.
IMPORTANT
Make sure that the product is activated by pressing SW1 in 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
OPERATION
The product will automatically, after the installation procedure, send
C1 messages every 180 seconds containing sensor data, such as
instantaneous temperature. The product will also send product status
information, containing battery status and other relevant information.
Release SW1 for
unencrypted mode
LED1 fast flash
Release SW1 for
encrypted mode
LED1 slow flash
6 s 5 s 12 s2 s*

© 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.
CMa12w Quick manual A4 English
Document id: 1090094
Version: 3.0
TROUBLESHOOTING
Master does not receive any messages from the product
This can be due to the following reasons:
• The product has not been activated during the installation
procedure.
• The master is not powered up or not correctly configured.
• The master is not within range of the radio signal.
• The master antenna is not properly mounted for best performance.
• The product is mounted inside a metallic cabinet or is disturbed by
other radio equipment.
LED1 is not illuminated when using push button
This can be due to the following reasons:
• The product has not been activated during the installation
procedure.
• The battery is empty. Check the serial number label of the product
when the product is produced. The battery lifetime is 15 years.
Meter values are incorrect
The temperature sensor is very accurate, but incorrect positioning of
the product may result in unintended temperature variations. Please
take the following in consideration when mounting the product:
• Do not mount the product close to heat or cold sources.
• Do not mount the product in direct sunlight.
• Do not mount the product in the area of a spotlight beam.
TECHNICAL SPECIFICATIONS
Mechanics
Casing material ABS UL94-V0, white
Protection class IP20
Dimensions 80 x 80 x 28 mm
Weight 75 g
Antenna Wireless M-Bus Internal
Mounting Wall mounted
Electrical
Power supply Battery, lifetime 15 years at 15-25 °C
Environmental
Operating temperature
range
-10 °C to +50 °C
Storage temperature range -40 to +85 °C
Operating humidity 0 to 95 %RH No condensation
Sensor accuracy
Temperature +5 to +55 °C +/- 0.2 °C Typical tolerance
Wireless M-Bus
M-Bus standard EN 13757-4 mode C1
M-Bus commands SND_NR
Values Temperature, instantaneous and
average over hour
Transmit interval 180 seconds
RF power 10 mW
Sensitivity -102 dBm
Frequency 868 MHz
Approvals
EMC EN 61000-6-2, EN 61000-6-3
Product Part number Description
CMa12w 1050068 Wireless M-Bus temperature
sensor for indoor use.
ORDERING INFORMATION
CONTACT INFORMATION
Elvaco AB Technical support:
Phone: [phone]
E-mail: support @elvaco.com
Online: www.elvaco.com
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
anyother way than described in this manual.
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