aSENSE is an advanced transmitter for installation in the climate zone. It measures both CO2 concentration and temperature.  The data is transmitted to a BMS system or controller and can be configured with UIP Software. Detected values are transformed into two analogue output signals that can be transmitted to a system master or DDC. aSENSE is available both with and without LCD display for FIXED installation in the climate zone as well as in the ventilation duct.

Key benefits

-Maintenance-free in normal applications.
-Contributes to lower energy costs when it is applied in a Demand Control Ventilation (DCV) strategy.
-Internal automatic self diagnostics.
-2 analogue outputs as standard (V/mA). Relay output as option.
-Cost-efficient RS485 communication as option.
-Internal 2-channel logger as option.



aSENSEis designed to control ventilation by transmitting the measured carbon dioxide and temperature value to the system´s Master or DDC. The transmitter is flexible and suits many different ventilation strategies.  According to most building regulations, the fresh air flow should, in rooms where people stay more than occasionally, be at least 7 litres/sec and person.
If the room occupants are adults with a light work-load and the outdoor CO2 concentration is 350 ppm, this airflow answers directly to an in-door CO2 concentration of 1040 ppm.
According to National Boards of  Occupational Safety and Health, the CO2 concentration can therefore be used as an indicator of the Indoor Air Quality (IAQ).  A CO2 concentration below 1000 ppm should then always be the aim.



Standard Specification
Operating Principle Non-dispersive infrared (NDIR)
Measured gas CO2
Measurement range CO2 0 - 2 000 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 to +50 °C
Operation humidity range 0 to 95% RH (non-condensing)
Power supply 24 VAC/VDC±20%, 50-60 Hz (half-wave rectifier input)
Power Consumtion < 3 Watts average
Response timeT90 2 min. diffusion time
Warm-up time ≤ 1 min. (@ full specs ≤ 10 minutes)
Communication Uart ( Modbus)
OUT1 linear output 0/2 to 10 V DC or 0/4-20mA (CO2)
OUT2 linear output 0/2 to 10 V DC or 0/4-20mA (°C)
*Maintenance-free with using SenseAir ABC self calibration using for normal indoor applications. Product Additional features
045-8-0001 aSENSE
045-8-0002 aSENSE Disp Display
045-8-0003 aSENSE RL No display, relay
045-8-0025 aSENSE Disp RL Display, relay
045-8-0028 aSENSE Ind Disp RL Display, relay, protection class IP54
045-8-0029 aSENSE MB RS485 No display, Modbus RS485 communication
040-8-0091 aSENSE Disp MB RS485 LOG Display, Modbus RS485 communication, Logger
00-0-1034 Set RS485 Adapter


Accessories & Software


The program enables you to setup and adjust meters produced by SenseAir AB. Using the "User interface program" it's possible to log meter measurements and to control meter functions. It's also possible to save and restore complete meter configurations to/from files.
UIP5 currently supports the platforms:
• eSENSE (K50)
• aSENSE (K40, not all versions)
• K33
• K30
• K22 (-OC and -LO)
UIP5 currently supports these connections:

USB Cable
ArtNr: 00-0-0049

I2C Box
ArtNr: 00-0-0012
(Sold as part of SADK.