Elvaco CMa20 User manual

INTRODUCTION
The CMa20 is an 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
CMa20
Outdoor M-Bus temperature and humidity sensor
1. Service
connector
2. M-Bus in
3. M-Bus out
4. Sensor pipe
5. Wiring lead-
through
6. 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 (6) when mounting on wall.
M-BUS 2-WIRE BUS
M-Bus is a multi-drop 2-wire bus with no polarity. Use a cable of area
0.25-1.5 mm2, e.g. a standard telephone cable (EKKX 2x2x0.5 mm).
Connect the incoming wiring to the screw connector (2) and use the
screw connector (3) for further M-Bus 2-wire bus connection.
IMPORTANT
• All connected M-Bus slave devices must have unique M-Bus
secondary or primary addresses depending on addressing mode.
• Measure voltage over M-Bus slave connection to verify M-Bus
master connection. Voltage should be between 21-42 VDC.
RESET TO FACTORY DEFAULT
Reset to factory default by issuing the M-Bus command “Application
reset”, see CMa20 Users Manual.
TROUBLESHOOTING
Product does not respond to M-Bus master commands
Please verify your M-Bus slave configuration and connection:
• Voltage over M-Bus connection should be between 21-42 VDC.
• All M-Bus slaves connected to the M-Bus master must have
unique primary or secondary addresses depending on which
addressing mode is used.
• Verify M-Bus slave baud rate used by M-Bus master. M-Bus
master baud rate must be identical to the M-Bus slave baud rate.
Temperature value is inaccurate
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 sources (front and rear).
• Do not mount the product in direct sunlight.
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.

© 2016, Elvaco AB. All rights reserved. The documentation and product are provided on an “as is” basis only and may contain deficiencies or
inadequacies. 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.
CMa20 Quick manual A4 English
Document id: 1090027
Version: 4.0
Mechanics
Protection class IP65
Dimensions 110x100x52 mm
Weight 140 g
Connection M-Bus Screw terminal 1.5 mm²
Mounting Wall mounted
Electrical
Power supply 21-42 VDC through M-Bus connection,
independent of the wiring polarity
Power consumption 1.5 mA M-Bus 1T
Environmental
Operating temperature
range
-40 °C to +55 °C
Storage temperature range -40 °C to +85 °C
Sensor accuracy
Temperature 10 to 30 °C +/- 0.2 °C
Humidity 10 to 90 % RH +/- 2 % RH
M-Bus
M-Bus standard EN 13757
M-Bus baud rate 300, 2400 Bit/s
M-Bus commands SND_UD, SND_NKE, REQ_UD2
Addressing modes Secondary, primary
Approvals
EMC EN 61000-6-2, EN 61000-6-3
Factory defaults
M-Bus baud rate 2400 Bit/s
M-Bus primary address 0
M-Bus secondary address Serial number
Product Part number Description
CMa20 1050025 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
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