Introduction
CMi4240 is a meter connectivity device mounted inside a
Kamstrup MULTICAL® 403/603/803 heating/cooling meter, en-
abling meter data to be sent to a server via a LoRaWAN®
network. CMi4240 can be retrofitted into deployed meters and
is suitable for applications requiring long-range wireless data
transmission. The device is easily configured using the Elvaco
OTC mobile app.
For a complete description of the product, or for information
in other languages, visit the Elvaco AB support website https://
support.elvaco.com.
Mounting the product
CMi4240 can be used in a Kamstrup MULTICAL®
403/603/803 heating/cooling meter (check the support site for
a complete compatibility list). If the product is not mounted in
the meter upon delivery, it is easily installed by following the
procedure below:
Caution
This is an electrostatic-sensitive product. Observe the necessary
ESD protective measures when installing the product.
1. Open the meter housing.
2. Apply ESD precautions. Make sure you are grounded
(e.g., by touching the meter’s metal pipe or a metal part
which is electrically connected to it).
3. Install the device. Hold the device by the outer edges and
gently press it into position in an available slot in the meter.
4. Attach the LoRaWAN® antenna. Route the antenna ca-
ble using the guiding pins in the meter housing. Connect
the antenna to the MCX connector on the device.
Caution
When using an external antenna, make sure to mount it at least
0,5 meters away from the meter to avoid interference.
5. Close the lid of the meter. When closed, the device will
receive power from the meter.
Activating the product
Note
Before activating the device, and trying to join a LoRaWAN® net-
work, make sure the LoRaWAN® network server in use is prepared
with necessary device- and security-related information. Security
keys for Elvaco devices can be accessed in Elvaco EVO, Elvaco
EVO Login.
Upon delivery, the device is set to inactive mode, which means
no messages will be transmitted from it before being activated.
It can be activated in two ways: via the buttons on the meter,
or via the Elvaco OTC App:
Activation via the meter buttons
• On MULTICAL® 403, press and hold both buttons on the
front of the meter until “CALL” is displayed.
• On MULTICAL® 603 and MULTICAL® 803, press and
hold the two arrow buttons on the front of the meter until
“CALL” is displayed.
Activation via the Elvaco OTC App
1. Open the Elvaco OTC app (available for Android and iOS).
2. Scan the device (make sure NFC is enabled on the
phone).
3. Go to Apply mode.
4. Set the power mode to Active.
5. Select Apply settings.
6. Scan the device to apply new settings.
To verify that it has been activated, go to Inspect, scan the
device, and make sure that power mode is set to Active.
NFC scanning position
MULTICAL® 403: Place the phone in the center of the raised sec-
tion on the back of the meter.
MULTICAL® 603: The meter has two slots:
• Left slot: Middle of the raised back section
• Right slot: Right side of the raised back section
MULTICAL® 803: Open the meter and place the phone close to the
device.
Joining the LoRaWAN® network
When activated, the device will attempt to join a LoRaWAN®
network. If it fails, it will perform retries until it succeeds. The
time between each attempt will increase for every attempt until
it’s performed once per day. A new join attempt cycle can be
manually triggered by deactivating and activating the device
using the Elvaco OTC App.
When the device has joined a LoRaWAN® network, meter
data will initially be transmitted every minute (regardless of
transmit interval settings) in order to set the right data rate.
After three minutes of calibration, the device will start deliv-
ering meter data using its configured settings. By using the
Elvaco OTC App, you can verify that the device is successfully
communicating with the meter (“Meter communication”) and is
connected to the LoRaWAN® network (“Network joined”).
LoRaWAN® end-device activation
Before being able to transmit data over a LoRaWAN® network,
the device must be personalized and activated. This can be
done in two ways: Over-the-air activation (OTAA) or Activation
by Personalization (ABP). For security reasons, Elvaco strong-
ly recommends using OTAA, where all network keys are gen-
erated each time the device joins the LoRaWAN® network.
In contrast, for ABP, all keys are set manually and stay con-
stant over time. The tables below list the required information
depending on the activation mode.
In OTAA mode
Device EUI 16-digit unique identification number (not configurable).
CMi4240Quick Manual
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Application
key
The application key of each device is generated by Elva-
co and used in OTAA mode to generate network keys
when it joins the LoRaWAN® network.
JoinEUI Sets the identification number of the join server. The
identification number is set to a default value in all de-
vices. The default value is presented in Elvaco OTC
configuration options.
In ABP mode
Device EUI 16-digit unique identification number (not configurable).
Application
session key
Used for payload encryption and decryption.
Network ses-
sion key
Used by both the device and the network server.
Technical specifications
Mechanics Value
Dimensions (W x H x D) 90 x 12 x 35 mm
Weight 33 g
Mounting In available slot of Kamstrup MUL-
TICAL® 403/603/803
External antenna connector MCX
Electrical connections Value
Supply voltage Powered via the meter.
Electrical characteristics Value
Nominal voltage 3.0 VDC
Power consumption (max) 50 mA
Power consumption (sleep mode) 2.5 µA
Environmental specifications Value
Operating temperature +5 - +55 ºC
Operating humidity 0 - 93 % RH, no condensation
Operating altitude 2000 m
Pollution degree Degree 1
Usage environment Indoors
Storage temperature -20 - 60 ºC
Radio characteristics Value
Frequency 915 MHz
Output power 20 dBm
Receiver sensitivity -135 dBm
LoRaWAN® characteristics Value
Device class Class A, bi-directional
LoRaWAN® version 1.0.2
Regional parameters US915
Activation OTAA or ABP
Data rate DR0 - DR3
JoinEUI 94193A0312000001
User interface Value
Push button Start-up / reboot / switch off device
Configuration NFC via Elvaco OTC app or via
downlink
Approvals Value
LoRa Alliance® LoRaWAN Certified
CM
EMC EN 301489-1, EN 301489-3
FCC Compliance Statement
This device complies with part 15 of the FCC Rules. Operation
is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2)
this device must accept any interference received, including
interference that may cause undesired operation.
Caution
The grantee is not responsible for any changes or modifications
not expressly approved by the party responsible for compliance.
Such modifications could void the user’s authority to operate the
equipment.
Note
This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment gen-
erates, uses, and can radiate radio frequency energy, and if not
installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or televi-
sion reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
•
Reorient or relocate the receiving antenna.
•
Increase the separation between the equipment and receiver.
•
Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
•
Consult the dealer or an experienced radio/TV technician for
help.
RF exposure statement
This equipment complies with the FCC RF radiation exposure
limits set forth for an uncontrolled environment. This equip-
ment should be installed and operated with a minimum dis-
tance of 20 cm between the radiator and any part of your body.
Canadian Compliance Statement
This device contains license-exempt transmitter(s)/receiver(s)
that comply with Innovation, Science and Economic Develop-
ment Canada license-exempt RSS(s). Operation is subject to
the following two conditions:
(1) This device may not cause interference.
(2) This device must accept any interference, including inter-
ference that may cause undesired operation of the device.
L’émetteur/récepteur exempt de licence contenu dans le prés-
ent appareil est conforme aux CNR d’Innovation, Sciences
et Développement économique Canada applicables aux appa-
reils radio exempts de licence. L’exploitation est autorisée aux
deux conditions suivantes :
(1) L’appareil ne doit pas produire de brouillage;
(2) L’appareil doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d’en compromettre le
fonctionnement.
RF exposure statement
This equipment meets the exemption from the routine evalua-
tion limits in section 6 of RSS-102. It should be installed and
operated with a minimum distance of 20cm between the radia-
tor and any part of your body.
Cet équipement est conforme à l'exemption des limites d'éval-
uation habituelle de la section 6 de la norme RSS-102. Il doit
être installé et utilisé à une distance minimale de 20 cm entre
le radiateur et toute partie de votre corps.
CMi4240Quick Manual
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