How does it work

Mount Kelvin is a well-functioning and reliable room control system using industry standard hardware. We dislike vendor-lockins just as much as anyone. That is why we support a variety of existing DALI, EnOcean & Bluetooth devices instead of supplying proprietary ones.

All data between the app, the cloud server and the central unit are encrypted using SSL technology that is widely used in online services like online banking.

Access control is based on computer-generated keys that are always strong in terms of security.

Technical support:
Lauri Haro
+358 40 086 1578

Ohjeet suomeksi


Take total control with ease. Use and configuration of Mount Kelvin is handled by the Mount Kelvin application. The application is free and is downloadable from App Store (iOS) and Google Play Store (Android).


In english (pdf) Suomeksi (pdf)


MacOS desktop widget

Open communication standards


DALI is an International Standard (IEC 62386) for the control of electronic ballasts, transformers, LED's, emergency lights & exit signs in an easy to manage digital lighting control system.


EnOcean is an International Standard (ISO/IEC 14543-3-10) for self-powered wireless switches, sensors and controls for energy-efficient, comfortable and secure buildings.

Open API

Open RESTful APIs are a widely adopted way of providing interoperability between computer systems on the Internet. We provide an API for developers and other service providers.

Wirepas mesh

Wirepas mesh enables large-scale wireless lighting control networks with thousands of luminaires. Each light can act as a location beacon. No control wires needed.

Installation guide

For lighting control, the following components are used:

  • Mount Kelvin Central Unit
  • Mount Kelvin application
  • DALI drivers for luminaires
  • DALI connected motion and light intensity sensors
  • Wireless and battery-free EnOcean switches
  • Amazon Echo voice control

Mount Kelvin control components are centrally installed on the DIN rail in the electrical switchboard.

How to choose the correct central unit?

There are four types of Mount Kelvin central units. Choose the correct model from the list below.

Mount Kelvin Medium model number 2809100
One Dali-controller installation (Helvar 510 + Helvar 402).

Mount Kelvin Large model number 2809101
Two Dali-controller installation (Helvar 510 + Helvar 402).

Mount Kelvin XL model number 2809102
Three or more Dali-controller installation (Helvar 510 + Helvar 402).

Mount Kelvin Small model number 2809103
Only for small installations. Maximum 10 luminaire groups (wireless retrofit components). No Dali-compatibility.

Planning guide

One DALI controller (Helvar 510) and one DALI power supply make up one controllable DALI universe. One DALI universe is capable of controlling 64 DALI addresses. Mount Kelvin recommends 55 DALI addresses per universe to ensure operational reliability. Please note that one driver might take up more than one DALI address (this is the case with RGBW drivers, for example). When the number of DALI addresses exceeds 55, we recommend splitting the universe into two universes.

Fixed luminaires, lighting sockets, decorative luminaires and 230V controlled luminaires
The manufacturers of fixed (or architectural) luminaires typically have a recommendation for a suitable DALI driver.

We recommend using Malmbergs MD01 (230V DALI dimmer) and Malmbergs MD02 (230V DALI relay) for light sockets and decorative luminaires (230V). Malmbergs components consume one DALI address.

RGB / RGBW strips
For RGB / RGBW strips, select a four-channel DALI driver or type-8 DALI driver. When calculating DALI addresses, note that one RGB/RGBW driver will take three / four DALI addresses.

Luminaire rails
Both DALI rails and 3-circuit 230V rails can be connected into Mount Kelvin.

DALI rails are simply connected to the DALI bus, 3-circuit rails are connected using three Malmbergs components.

Motorized blinds / curtains
Helvar 490 is a 2-channel blinds controller that allows control of blinds and curtains in Mount Kelvin. The blinds controller is a DIN-rail mounted unit that provides two independent control channels, each with two single-pole, volt-free contacts for switching up to 550 W up/down or power direction motors. The controller consumes two DALI addresses.

Motion & presence sensors
Mount Kelvin compatible sensors include Helvar 311 DALI PIR Motion Detector and Helvar 312 DALI PIR Motion Detector and Light Sensor (Standard Light Control).

Please take the electric consumption of the motion sensors into account when planning the DALI universes. Each sensor consumes 15mA, and the DALI power supply supplies 250mA. Up to 16 motion sensor can be installed in one DALI universe, provided there are no other devices in the universe (15mA x 16 = 240mA).

Connections in the electrical switchboard

The picture above shows a typical Mount Kelvin installation. Components from left to right: DALI power supply (Helvar 402), DALI controller (Helvar 510 includes Mount Kelvin DIN mount), Mount Kelvin Central Unit and power supply unit (Meanwell DR-15-5).

  1. Attach the components to the DIN rail in the order shown above
  2. Connect the power supply of the Central Unit (L, N)
  3. Connect the power supply of the Central Unit to the Central Unit with the Micro USB cable supplied with the power supply. The Micro USB connector on the Central Unit is located in the upper left corner of the Central Unit
  4. Connect the EnOcean antenna to the Mount Kelvin Central Unit and take the antenna out of the electrical switchboard
  5. Connect the Ethernet cable to the Central Unit
  6. Connect the DALI controller to the Central Unit using the supplied Mini-B USB cable. The Central Unit has four USB ports. You can use any USB port
  7. Connect the DALI power supply to the DALI controller. Connect the power supply to the DA+ and DA- DALI controllers DA+ and DA terminals
  8. Connect the DALI power supply to 230V (L, N, E)

Other Helvar DIN compliant components (if needed)

  1. Connect the DALI controller (DA+ and DA-) from the DALI controller to the DALI bus (DA+ and DA-) of the Helvar unit
  2. Chain the DALI bus for other Helvar components

Designing large projects

Large locations may have several electrical switchboards that include DALI controllers. These separate switchboards are compounded into a single system by a master-slave structure as follows:

  1. The switchboards are connected by an TCP/IP ethernet local area network
  2. All of the switchboards contain a Mount Kelvin Central Unit
  3. One of the Central Units is designated as the master unit
  4. The rest of the Central Units are slave units

Now all of the seperate DALI universes are configurable and controllable as one set of DALI universes.

Wireless switch signaling in large projects
The range of wireless switches in a built environment is approximately 30 m. When the signal from the switch to the Central Unit is bad, ther are two ways to mend this:

  1. Using Eltako FRP70 signal repeaters
  2. Using Mount Kelvin slave Central Units

Connecting over four DALI controllers into the Central Unit
The Mount Kelvin Central Unit has four USB ports for connecting DALI controllers. In larger locations, it is possible that there are five or more DALI controllers in one electrical center. In this case, a USB splitter (USB hub) can be used to connect all DALI controllers to the Mount Kelvin central unit.

Required components

Mount Kelvin
Central Unit

Dimensions (mm):
70 x 90 x 62

Central Unit
power supply

Mean Well DR-15-5
Dimensions (mm):
25 x 93 x 56


Helvar Digidim 510
Dimensions (mm):
36 x 44 x 58

power supply

Helvar Digidim 402
Dimensions (mm):
35 x 58 x 90

Wired ethernet
Internet connection


Additional components

DIN rail components (control through DALI).

dimmer unit

Helvar Digidim 454
Dimensions (mm):
160 x 91 x 62

relay unit

Helvar Digidim 498
Dimensions (mm):
160 x 90 x 58

relay unit

Helvar Digidim 494
Dimensions (mm):
88 x 90 x 58

1-10V controller

Helvar Digidim 474
Dimensions (mm):
160 x 90 x 58

8-channel DALI
broadcast controller

Helvar Digidim 478
Dimensions (mm):
160 x 90 x 62

blinds controller

Helvar Digdim 490
Dimensions (mm):
88 x 58 x 90

230V dimmers and relays

230V dimmer

Malmbergs MD01
Dimensions (mm):
77 x 51 x 23

230V relay

Malmbergs MD02
Dimensions (mm):
77 x 51 x 23


Mount Kelvin stores all sensor data to the cloud and submits the information to the property owner giving instant feedback on temperature, humidity and movement.

DALI PIR motion
& light intensity sensor

Helvar Digidim 320
Dimensions (mm):
65 x 49 x 55

Wireless switches

Mount Kelvin uses wireless and battery-free 868 MHz EnOcean switches. Mount Kelvin recommends Gira EnOcean switches to ensure the best quality and click-feel of the switches.

A wireless switch is very flexible, as it has no physical connection to the light sources. By using the Mount Kelvin app, you can configure a switch to be a switch for a single luminaire, a switch to control the lights in a room, or a master switch for the whole building. You configure the switches within seconds using the Mount Kelvin app. No special training is required!

Being wireless gives you the full freedom to position the switch wherever you find most convenient.

Amazon Echo

Voice control your lights. To enable voice control you need Mount Kelvin Central Unit and Amazon Echo / Echo Dot. Remember that rooms and scenes need to be named in English. Echo Dots are available in black and white.

Installation instructions:

  1. Create an Amazon account and begin setup at
  2. Search and enable Mount Kelvin skill. Insert key and connect
  3. Search your existing Mount Kelvin rooms and scenes: "Alexa, discover new devices"
  4. Timezone settings are in > Settings > xxx's Echo Dot
  5. Just try & speak to Alexa:
    “Alexa, lights on"
    "Alexa, turn off kitchen"
    "Alexa, turn on evening light"