1
Features
Real time detect, transmit and control indoor air quality
3-color TFT screen display and warning indoor CO2, TVOC, temperature and
relative humidity
Four buttons for operation conveniently
Two power supply optional for different application
Provide up to 3 a 1 relay outputs or 3 1 analog outputs
Optional Modbus RS485 interface, to connect PC, realize remote control
Specification
Carbon Dioxide
Detecting gas
Carbon Dioxide (CO2)
Gas sensor
NDIR sensor
Accuracy@25
℃
(77
℉
)
±50ppm + 3% reading
or ±75ppm (whichever is greater)
Stability
<2% of FS over lifetime (15 years) of sensor
Calibration
ABC Logic
self-calibration
Lifetime of NDIR CO2 sensor
15 years (normal using)
Response time
<2 minutes for 90% step change
Renewed signal
Every 2 sec
Warm up time
2 hours (first time or using again after power off for a long time)
2 min (operation)
CO2 measuring range
0~2000ppm (default)
0~5000ppm (selected in the advanced setup)
CO2
display resolution
1ppm
TVOC
Sensing element
Japan Figaro semi-conductor mixed gas sensor
TVOC measuring range
0-30ppm
Temperature & Relative Humidity
Temperature sensor (selectable)
High precision digital integrated temperature and humidity sensor SHT,
or NTC thermistor
Measuring range
-
20~60
℃
/-4~140F (default) 0~100%RH
Accuracy
Temp.: <±0.5
℃
@25
℃
RH: <±3.0%RH
（
20%~80%RH
）
Electrical Specification and Functions
Power supply
24VAC/VDC or 100-240VAC
Power consumption
5.5 W max. ; 2.5 W avg.
LCD screen
3-color TFT screen, with 4 buttons for operation
Output
Up to 3× 1× relay outputs or 3× relay + 1× analog outputs
Analog: 0~10V or 4~20mA or PID
Relay: rated current: 5A, resistance load
CO
2
Transmitter/Controller
Model
: AT-VLX series
User Manual
