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User's Manual
Carbon Dioxide Detector
Model: AT-VLC-A2-RS-VAV
Specifications
General Data
Power supply
Consumption
Analog outputs
RS485 interface
LED light condition selectable
OLED Display
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
Response time
24VAC/VDC±10%
3.5 W max. ; 2.0 W avg.
Two 0~10V outputs, PID or linear
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
Display CO2 or CO2/temp. or CO2/Temp./ RH measurements
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)
0~5000ppm (selected in the advanced setup)
±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
<2 minutes for 90% step change typical
Working light mode
Green on: working
Red flashing: CO2 sensor faulty
1
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Table of Contents
Related Manuals for Atal AT-VLC-A2-RS-VAV
Summary of Contents for Atal AT-VLC-A2-RS-VAV
- Page 1 User’s Manual Carbon Dioxide Detector Model: AT-VLC-A2-RS-VAV Specifications General Data Power supply 24VAC/VDC±10% Consumption 3.5 W max. ; 2.0 W avg. Analog outputs Two 0~10V outputs, PID or linear Modbus protocol 4800/9600(default)/19200/38400bps; RS485 interface 15KV antistatic protection, independent base address.
- Page 2 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 -20~60℃/-4~140F Accuracy RH: <±3.0%RH （20%~80%RH）...
- Page 3 Instruction 1. Please always cut off the power before open or clean the detector. 2. As powered on, the indicating light is red through the middle bottom of the front cover. It indicates the transmitter working on. The number on OLED screen displays counts down from 10 seconds to 0, and then it starts displaying measured CO2, temperature and relative humidity values.
- Page 4 Advanced Setup Cut off the power and open the cover, there are four DIP switches on the middle right side of circuit board. DIP1=OFF Normal use, DIP1=ON Set advanced parameter Default: OFF DIP2=OFF Centigrade DIP2=ON Fahrenheit Default: OFF DIP3 – un-effective Default: OFF DIP4 –...
- Page 5 Modbus Register Mode: RTU (MSB First) Baud Rate: 1-4800 2-9600 3-14400 4-19200 5-38400 bps default: 2-9600bps Start Bits: Data Bits: Stop Bits: 1 / 2 default : 2 Parity: None / Odd / Even default: None Modbus Address: 1~247 default: Register Map Support Function: 6 16...
- Page 6 Modbus Stop Bit INT16 1-None 1Stop Bit; 2-None 2Stop Bit; 3-Odd 1Stop Bit; 4-Even 1Stop Bit CO2 Correction for INT16 -300~300ppm Measurement Temp. Correction for 3/16 Float inverse -5.0~5.0 ℃ Measurement Humi Correction for 3/16 Float inverse -10~10 %RH Measurement Logic of co2 Control INT16 0-increase CO2...
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