aSENSE™ VAV
aSENSE VAV is a stand alone controller that measures both CO2 concentration and temperature in ambient air and has a terminal for extra functions for example manual override and it´s also prepared for Modbus. The unit is a key component for energy-effective and healthy climate control of rooms with a varying number of people. Detected values are transformed into analogue and digital signals presented through four separate outputs: two analogue, one relay and one open collector / 3rd. analogue (selectable). Includes a LCD display and push buttons. aSENSE-VAV is available for installation in the climate zone as well as in ventilation duct.
Key benefits
-Cost-optimized for direct linear control of dampers and speed regulated fans.
-Contributes to lower energy costs when applied in Demand Controlled Ventilation.
-Internal automatic self diagnostics.
-Available with different measurement ranges and several housing options.
-Serial communication port for connection to a PC or a GSM module and local network.
Applications
A common application for aSENSE VAV is controlling ventilation in rooms occupied by people. The sensor is flexible and designed to suit many different ventilation strategies. It is a key component for energy-effective, healthy climate control of rooms with varying load like schools / nurseries, cinemas/theatres, sports centers etc. Museums and libraries are rooms where the control of the ventilation is based on temperature and carbon dioxide measurements. It can be combined with control of humidity to secure the optimal environment of the objects. To avoid condensation problems it is often necessary to measure humidity in air conditioning and in other cooling applications. With aSENSE VAV-RH all parameters can be measured and controlled from the same unit. This sensor is a basic component to be used in a lot of different ventilation applications, as well as in industrial / agriculture process controls.
Specifications
| Operating Principle | Non-dispersive infrared (NDIR) with Automatic Baseline Correction |
| Measured gas | Carbon dioxide (CO2) |
| Measurement range CO2 | 0 to 2000 ppm |
| Accuracy | ±30 ppm ±3% of reading |
| Dimensions | 120 mm x 82 mm x 30 mm |
| Maintenance | Maintenance-free* |
| Life Expectancy | > 15 years |
| Operation temperature range | 0 - 50 °C (Lower temperature operation range can be reached by adding a box heater assembly) |
| Temperature measurement | 0 - 50 °C |
| Operation humidity range | 0 to 95% RH (non-condensing) |
| Power supply | 24 VAC/VDC±20%, 50-60 Hz |
| Power Consumtion | ≤ 3 Watts average |
| Response timeT90 | 2 min. diffusion time (20 sec. with tube connection at 0.1 litre/minute gas flow) |
| Warm-up time |
≤1 min. |
| Communication | Uart ( Modbus) |
| Outputs | |
| OUT 1 linear output |
0/2 to 10 V DC or 0/4 - 20mA 600 to 900 ppm (CO2) 23-24 (°C) |
| OUT 2 linear output | 0/ 2 to 10 V DC or 0/4 - 20mA, 600 to 900 ppm |
| OUT 3 relay | Closed>600 ppm Open<500ppm (CO2) |
| OUT4 linear conversion | 0 to 10 V DC or 0/4 - 20mA, 20 - 18 °C |
*Maintenance-free with using SenseAir ABC logic Self calibration using for normal indoor applications.
Art.no.
| Art.no. | Product | Additional features |
| 040-8-0011 | aSENSE VAV - Hdisp | Hidden display |
| 040-8-0016 | aSENSE VAV - Disp | Display |
| 040-8-0010 | aSENSE VAV - Disp SL | Display, screw locked lid |
| 040-8-0040 | aSENSE VAV - Hdisp MB RS485 | Hidden display, Modbus RS 485 communication |
| 040-8-0079 | aSENSE VAV - Hdisp LON | Hidden display, LON communication |
| 040-8-0061 | aSENSE VAV - Hdisp RH | Hidden display, relative humidity 0 to 100%vol |
Download
Data sheets
Manuals
aSENSE VAV User Manual (English)
aSENSE VAV Installation (English)
aSENSE VAV User Manual (Swedish)
aSENSE VAV Installation (Swedish)
Application Examples
