e-Bus Coupling Surface is a family of smart mechanisms that are connected to AirQualy sensors to supply them with the power they need to operate. Depending on the model, they include a communications protocol to transmit the information to a building management system, or they include a range of digital and analogue outputs to control an air renewal system.

There are three models to choose from in accordance with the needs of each installation: a stand-alone model, a model with outputs 0-10V / 4-20 mA  and relay, and a Modbus model.

e-Bus Coupling Surface 2O is a coupling unit that includes a configurable 0-10 V or 4-20 mA analogue output that can be configured to provide the value measured by any of the sensors or to perform a PI control on an air renewal damper or an air conditioning system. It also includes a micro-relay to perform a proportional control and act on any external element through an on/off control.

The equipment is powered at 12-24 Vdc and includes terminals to connect an external DIN rail source ref. FA-15W-24V.

The unit is designed to be mounted on a surface. Therefore, it is not necessary to use a box for its installation, given that it can be installed on any wall or glass surface.

General features:

  • Coupling unit for mounting AirQualy sensor
  • A configurable 0-10V or 4-20mA analog output
  • A configurable NO/NC micro-relay output 1 A at 30 VDC
  • Configuration through AirQualy sensor with APP EConfigurator by NFC
  • Outputs to provide the measured value or perform a PI (0-10V / 4-20 mA output) or P (relay) control
  • Surface mounting
  • Supply power 12-24 Vdc
Ordering number: 
Supply input: 12-24 Vdc
Number of outputs: 
Outputs names: 
0-10 V / 4-20 mA + Relay 1 A at 30 VDC

The e-Bus Coupling Surface 2O equipment is responsible for providing the necessary power to the AirQualy sensor for its operation. This product model has 2 outputs: One analogue and one relay type. The analogue output can be configured to work with 0-10 V voltage or with 4-20 mA current. The operating mode can also be configured to provide the value measured by any of the sensors, or to perform a PI control (proportional-integral) on an external element, such as an air renewal damper associated with the CO2 sensor or a climate control associated with the temperature sensor. The equipment includes a second relay-type output to perform a proportional on/off control from the value measured by any of the sensors and from a previously configured setpoint.

The equipment is powered by a power supply connected to the electrical network.

The following graphs show the operation of the two outputs:

a) Analog output response:

b) Kp transfer graph:


c) Relay output respone:


Equipment setup

This product model is configured through the AirQualy front, using the E-Configurator APP. When creating the project in the APP, select this product model. When the project opens, click on the device bar and select the coupling unit to modify its configuration parameters.


Operation LED indicator
The equipment includes a LED indicator on the front called Status that has the following statuses:

  • Normal operation: when the equipment is powered, it turns ON and after a few seconds it goes OFF.
  • Air Qualy disconnected: The LED briefly flashes every two seconds.
  • Configuration fault: This fault occurs if the AirQualy front panel has been configured with a different frame than the one it was connected to. In this case the LED flashes every second.
  • AirQualy internal fault: The LED lights up for more than 6 seconds
  • Software load by bus: The LED flashes constantly fast

Mounting process of the product The unit is designed to mount directly on the surface, fixing by means of 2 screws to the holes in the equipment. The AirQualy front frame acts as a product box, being protected once it is fully installed.

The connection cables to the equipment must not have a section greater than 0.5mm²

Installation process

  1. Pass the power supply and output cables through the hole in the coupling unit (see installation diagram).
  2. Fix the e-Bus Coupling Surface device to the wall.
  3. Fix the frame to the rack by the teeth on the upper part and press lightly on the lower part until you hear a “click”.
  4. Attach the AirQualy sensor centred on the frame, previously inserting the label supplied with the sensor, in the front of the equipment.
  5. Power the equipment and wait 5 minutes to obtain a correct measurement.

Installation drawing


| | 0 | Datasheet | Product Features Document
| | 1 | Instruction Sheets | Product Installation Document

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