Multi Sensor

While the sensor itself communicates via Modbus and BACnet, it can be integrated into cloud-based systems through a compatible gateway or building management platform that supports cloud connectivity.

Installation and configuration of the Alledio Modbus & BACnet Sensor are designed to be straightforward for professionals familiar with Modbus or BACnet systems. The process involves several clear steps:

• Choose the Right Location: Mount the sensor away from direct airflow sources (such as fan coils, split systems, or ventilation intakes) to ensure measurement accuracy.
• Position at the Correct Height: Install the sensor at approximately 1.5 meters from the floor for optimal performance.
• Secure the Sensor: Attach the sensor to the wall using the provided back plate, ensuring correct orientation with the "UP" marking.
• Connect Communication and Power: Use the specified terminals for Modbus/BACnet communication (Pins 3, 4, and 5) and power supply (Pins 1 and 2).
• Close the Sensor: After wiring, close the sensor by attaching the front plate.
• Configure the Sensor: Complete setup using a smartphone, which streamlines the configuration process.

This step-by-step approach ensures the sensor is installed correctly and delivers reliable results. 

The Alledio Indoor Modbus & BACnet Sensor supports on-device calibration for all measured parameters (temperature, humidity, CO₂, VOC, etc.) via a mobile web app, which is accessed by simply tapping your smartphone on the sensor case. This makes calibration quick and convenient, without the need for specialized tools or software.

• Calibration Frequency: For typical building monitoring, annual or biannual calibration is often sufficient unless your application has stricter standards. The frequency depends on your application, environmental conditions, and accuracy requirements
• Calibration Method: You can set precise offsets for each sensor parameter directly through the mobile web app. This allows you to adjust readings to match reference instruments or account for environmental factors.

The Multi-sensor does not require regular physical maintenance under normal indoor conditions. However, routine visual inspection and periodic calibration checks are good practice for ensuring long-term reliability and measurement accuracy.

The VOC (Volatile Organic Compounds) sensor in the Alledio sensor uses advanced metal-oxide sensing technology combined with a sophisticated gas index algorithm to continuously monitor air quality in your environment. 

Instead of providing an absolute VOC concentration, the sensor calculates a VOC Index that reflects the current air quality relative to the recent history of the room. 

This adaptive approach allows the sensor to account for each environment’s unique background VOC levels, ensuring accurate and meaningful readings. The VOC Index is mapped to a scale where a value of 100 represents the average background level, with higher values indicating increased VOCs (such as from cooking or cleaning) and lower values reflecting fresher air, such as after ventilation.

A helpful way to understand this functionality is to compare the VOC Index to how the human nose perceives odors. Just as your nose uses its memory of recent smells to judge whether a new environment is fresher or more polluted, the VOC Index uses a moving average as its baseline. 

This enables the sensor to detect changes in air quality with sensitivity similar to our sense of smell, even for odorless VOCs. The adaptive gain of the VOC Index ensures that varying VOC events are quantified consistently, allowing the thermostat to trigger actions—such as activating ventilation—whenever air quality deteriorates beyond a set threshold.

Yes, by providing detailed environmental data, the sensor can support demand-driven HVAC control, which can optimize energy use and reduce costs while maintaining comfort and air quality.

First, check for obvious issues such as sensor placement, obstructions, or network problems. If the problem persists, consult the troubleshooting guide or contact technical support.

Yes, you can connect multiple Alledio Indoor Modbus & BACnet Sensors on a single bus connection using the daisy chain method, which is standard for both Modbus RS485 and BACnet MS/TP networks.

In a daisy chain, each sensor is wired in series along the same communication line. For RS485 networks, connect all “A” (DATA +) terminals together and all “B” (DATA -) terminals together across each device. This method minimizes cable clutter and simplifies network expansion.

Each sensor must be assigned a unique network address to ensure proper communication and device identification on the bus.

To maintain signal integrity, place termination resistors (typically 120 ohms) at the first and last devices in the chain.

The maximum number of devices per segment depends on your protocol and network design. For BACnet MS/TP, up to 64 devices per segment is recommended without repeaters, and up to 127 with repeaters. For Modbus RTU, typical recommendations are up to 31 devices, though some systems support more depending on network quality and configuration.

This approach is compatible with most building management systems that support Modbus or BACnet. Ensure that your controller or master device is configured correctly and that all sensors share the same baud rate and communication settings.

If you receive abnormal readings from your Alledio Indoor Modbus & BACnet Sensor, follow these steps:

• Check Basic Issues: Ensure the sensor is installed in the correct location, away from direct airflow, heat sources, or obstructions that could affect measurements. Verify all wiring, network connections, and power supply are correct.‍
• Review Network and Configuration: Confirm that the sensor’s communication settings (Modbus or BACnet address, baud rate, parity, etc.) are correctly configured and that there are no address conflicts on the bus.‍
• Commissioning and Calibration: Before first-time use, after connecting the sensor to the cables and powering it up, you must allow the sensor to complete its initial auto-calibration process (typically 30 to 45 minutes). Do not interact with or adjust the sensor during this phase.
  After auto-calibration, you must calibrate the sensor and set the offsets for each parameter (temperature, humidity, CO₂, VOC, etc.) using a parallel reference instrument. This is done via the mobile app (using NFC and WiFi), ensuring the sensor’s readings match the reference device.
• ‍Adjust Offsets: Use the app to fine-tune sensor offsets for any parameter that deviates from your reference instrument. This step is critical for ensuring accuracy in your specific installation environment.
• ‍If Issues Persist: If abnormal readings continue after proper installation, calibration, and offset adjustment, consult the troubleshooting guide or contact Andivi technical support for further assistance.

We don’t give away free samples. However, you are welcome to purchase a sample device, allowing you to explore its features and capabilities firsthand.

We strive to offer flexible solutions for our clients while ensuring a high-quality experience for end-users. Because adaptability is important to us, we have outlined all available customization options in the OEM section.

For larger batch or OEM orders, the Alledio Multi-Sensor platform is highly customizable to meet specific project or industry requirements. Beyond the standard integration of temperature, humidity, VOC, CO₂, pressure, enthalpy, dew point, density of moist air, and presence sensors, we can integrate virtually any type of professional sensor that your application demands.

Examples of additional sensors that can be integrated include:

• Particulate Matter (PM2.5/PM10) sensors for air quality and pollution monitoring.
• Light (lux) sensors for daylight harvesting or occupancy-based lighting control.
• Sound level (decibel) sensors for acoustic monitoring in offices or public spaces.
• Formaldehyde (HCHO) or other specific gas sensors for industrial or laboratory environments.
• Ozone (O₃) sensors for air purification or compliance monitoring.
• Motion or vibration sensors for security, equipment monitoring, or smart building automation.
• Water leak or flood sensors for facility protection.

For OEM or custom hardware development needs, specify your device requirements. Our engineering team can integrate, test, and validate the new sensor configuration, ensuring seamless operation with your chosen communication protocols (Modbus, BACnet, MQTT, etc.) and building management systems.

This flexibility allows you to deploy a single, unified device tailored to your needs—whether for smart buildings, industrial monitoring, healthcare, agriculture, or custom research applications.