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 - 20mA600 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 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