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User's Manual
Carbon Dioxide Detector
Model: AT-VLC-ND-A2-RS
Specifications
General Data
Power supply
Consumption
Analog outputs
RS485 interface
LED light condition selectable
Operation condition
Storage condition
Net Weight / Dimensions
Installation
Housing and IP class
Standard
Carbon Dioxide
Sensing element
CO
measuring range
2
CO
Accuracy @22℃(72℉)
2
Temperature dependence
Stability
Pressure dependence
Calibration
24VAC/VDC±10%
3.5 W max. ; 2.0 W avg.
Two 0~10VDC/4~20mA for CO2/Temperature measurements
PID control output is selectable for CO2
Modbus protocol
4800/9600(default)/19200/38400bps; 15KV antistatic protection,
independent base address.
3-color mode (default)
Green:
≤1000ppm
Orange: 1000~1400ppm
Red:
>1400ppm
Red flashing: CO2 sensor faulty
0~50℃; 0~95%RH, non condensing
-10~60℃ / 0~80%RH
190g /117mm(L)×95mm(W)×36mm(H)
wall mounting with 65mm×65mm or 2"×4"wire box
PC/ABS fireproof plastic material, protection class: IP30
EMC approval
Non-Dispersive Infrared Detector (NDIR)
0~2000ppm (default)
±60ppm + 3% of reading or ±75ppm (whichever is greater)
0.2% FS per℃
<2% of FS over life of sensor (15 year typical)
0.13% of reading per mm Hg
ABC Logic Self Calibration Algorithm
Working light mode
Green on: working
Red flashing: CO2 sensor faulty
1
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Summary of Contents for Atal AT-VLC-ND-A2-RS
- Page 1 User’s Manual Carbon Dioxide Detector Model: AT-VLC-ND-A2-RS Specifications General Data Power supply 24VAC/VDC±10% Consumption 3.5 W max. ; 2.0 W avg. Two 0~10VDC/4~20mA for CO2/Temperature measurements Analog outputs PID control output is selectable for CO2 Modbus protocol RS485 interface 4800/9600(default)/19200/38400bps; 15KV antistatic protection, independent base address.
- Page 2 Response time <2 minutes for 90% step change typical Signal update Every 2 seconds Display resolution 1ppm Warm-up time 2 hours (first time) / 2 minutes (normal operation) Temperature and RH (option) Digital integrated temperature and humidity sensor or Temperature sensor (selectable) NTC thermistor Measuring range 0~100%RH relative humidity...
- Page 3 Analog Output Selection ◆ The default analog output is 0-10V. If you want to change to 4-20mA output, please follow the below. ◆ Open the cover, you can see five black blocks of J1 & S1~S4. The J1=OFF corresponding to 0-10V and the J1=ON corresponding to 4-20mA. At the same time, connect ‘V’ side of S1~S4 corresponding to 0-10V and connect ‘A’...
- Page 4 4-19200bps 5-38400bps Modbus Stop Bit INT16 1-None 1Stop Bit; 2-None 2Stop Bit; 3-Odd 1Stop Bit; 4-Even 1Stop Bit CO2 offset INT16 -300~300ppm Temperature offset 3/16 Float inverse -5.0~5.0 ℃ Relative Humidity offset 3/16 Float inverse -10~10 %RH Logic of Relay Control 3/16 INT16 Increase CO2...
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