AT-VL-03T
Carbon Dioxide Monitor & Air Alert
User manual
Important safety information Warning
Always turn off power before mounting, removing, and cleaning the monitor.
Read all of the information in this manual before mounting the monitor.
Notice the supply power voltage of the monitor: 24VAC/DC. do not confuse it and do not install on voltages
higher than marked the monitor.
Do not touch the circuit board or components with electrifying, to avoid danger for users.
Mounting (see Fig.1)
Find the 2 clips on either side of the indicator; depress them with a non-edge tool to remove the main part
and the clapboard from the wall plate.
Mount the wall plate first on the wall, 1.2-1.3 meters above the floor. Place the indicator against the wall at
desired location; make sure wires can be feed through opening on wall plate.
Connect wires to terminal strips (see fig.1). Make sure wiring connection correct and secure.
Attach the main with clapboard to the wall plate.
Buttons and LCD
Operation
1. After electrifying，OFF displayed on the right bottom of LCD，which means monitor is OFF.
2. Press power button for about 1 second to turn it on. The measured temperature and the measured humidity display on the upper line of LCD. The
measurement of CO
2
displays on the bottom line of LCD. If no humidity detection, the measurement of humidity shall not display.
3. If the monitor is used for the first time or is used again after long time laying up, it should be powered and turned on for 48 hours at least, to make the
CO
2
measurement in self calibration.
4. switch button: can be switched three different CO
2
alert values and 1 temperature set value displayed on top left of LCD and it marks by 1, 2, 3 and 4.
—1： Setting value is the boundary between green light and orange light (the first point) .The default setting is 1000ppm.
If CO
2
measurement≤ the setting value, the green light would be bright.
—2： Setting value is the boundary between orange light and red light (the second point). The default setting is 1400ppm.
If the first setting value< CO
2
measurement and ≤ the setting value, the orange light would be bright
If CO
2
measurement > the setting value, the red light would be bright.
—3： Setting the CO
2
value which used to control the analog output (just for DIP3 = OFF, DIP4 = ON).
If CO
2
measurement>the third setting ,the controller will be have the analog output.
—4： Temperature value setting (effective when DIP3=OFF and DIP4=ON, also parameter18=1), setting range: 5~50℃/ 41~122℉
Control way: when measured temp.≥ (setting temp. + temp. differential), the analog output is maximum;
when (setting temp. + temp. differential) >measured temp.> (setting temp. - temp. differential) , the analog output keeps on last status ;
when measured temp.≤ (setting temp. - temp. differential), the analog output is controlled by CO
2
level.
There will be no analog output when the CO2 monitor is switched off by pressing ‘power’ button.
5. Preset CO
2
setting value: choose the first or second or third point of CO
2
by press button of switch in circle,
then set the value by press ▲ or ▼ with 1ppm adjusting each time. When press ▲ or ▼ for more than
3 seconds, the setting value would change quickly with 10ppm each time.
Preset temperature setting value: choose the temperature setting value by press button of switch , then set
the value by press ▲ or ▼ with 0.5℃ adjusting each time. When press ▲ or ▼ for more than 3
seconds, the setting value would change quickly. As you adjust the value, it would blink up to confirm it.
6. Lock the settings: press ▲ and ▼ simultaneously for 5 seconds until appearing in the top right corner.
Then you cannot adjust the set values.
7. Unlock the setting: press the ▲ and ▼ simultaneously for 5 seconds until disappears.
8. The number of scale bar are corresponding with 0～10V analog output. One scale bar indicates 1VDC of
analog output.
switch setting
up
down
turn on/off
Fig. 2
AT-VL-03T
0-10VDC
AT-VL-03T
Fig. 1
ONON
voltage of analog output
CO
2
temperature
lock mode
Parameter Setup (V.2W2KPV105)
After power off and remove the backboard and clapboard from the main part as shown in fig. 2. There are 4 Dipswitches in the circuit board as following:
DIP1: ON-Parameter setup OFF- User operation Leaving Factory：OFF
DIP2: ON- Fahrenheit OFF- Celsius Leaving Factory：OFF
DIP3：ON- The analog output is direct proportion linearization
OFF- The analog output is PID adjustment (Please refer to Item -23 at table below) Leaving Factory：OFF
DIP4：ON- with an analog output OFF- without an analog output Leaving Factory：ON
Dipswitch up is on and Dipswitch down is off.
Press switch key to switching parameters and press▼▲keys to setting. After setup, DIP1 must be put to OFF.
Display
on LCD
Parameter
Range of setup
Default
-00
Device Version
1105
-01
Device ID
1~255
1
-02
Device Baud Rate
4800,9600,14400,19200,38400
19200
-03
Device Stop and Parity Bits
1-None 1Stop; 2-None 2Stop;
3-Odd 1Stop; 4-Even 1Stop
1
-04
The slight temp. difference of starting / closing analog output
（just for DIP3=OFF,DIP4=ON, -23=1）
0.5~3.0C/0.9~4.5F
1.0C/2.0F
-05
Adjusting the brightness of 3-lights
0~1023
50
-06
CO2 modification Aim
0~ The maximum of CO
2
measurement and setting
(Please refer to Item -22)
0
-07
Temp. modification Aim
0~60C/32~140F
25.0C/77F
-08
Humidity modification Aim
5~95%RH
50%RH
-09
The lowest voltage of the analog output (just for DIP3=OFF)
0~the highest analog output
2.0
-10
The highest voltage of the analog output (just for DIP3=OFF)
the lowest analog output~10.0
10.0
-11
Response rate of analog output (just for DIP3=OFF)
1~200 (the smaller the value, the quicker the response)
20
-12
0: analog output is 0 when CO2 detecting value < setting value
1:analog output is the setting lowest voltage when CO2 detecting value < setting value (just for DIP3=OFF)
0
-13
When it used as a transmitter, analog output linearize with CO
2,
the output voltage which corresponds with 0ppm
0~9.0
(corresponding 0~9V）
0.0
e.g. the setting value is 2.0 and CO
2
measuring range is 0~2000ppm, DC 2V output corresponds with 0ppm and DC10V with
2000ppm
-14
Preheating time for CO
2
sensor
(before CO
2
sensor steady, no analog output)
1~600 seconds
60s
-15
State of the monitor when power on again after power broken.
0：Turn off after power on again 1：Turn on after power on again 2： Keep on previous state before power broken
2
-16
CO2 Elevation Calibration
Warning: if you change this item, please wait a few seconds after
the icon "——" disappear on the LCD, then the new setting will
prevail.
press▼or▲more than 20 seconds to perform CO2 Elevation
Calibration.
0~5000Feet
0
-17
CO2 ABC Logic
Warning: if you change this item, please wait a few seconds after
the icon "——" disappear on the LCD, then the new setting will
prevail.
press▼or▲more than 20 seconds to perform CO2 ABC Logic
1-Enable
2-Disable
1
-18
CO2 Single Calibration
Warning: if you change this item, please wait a few seconds after
the icon "——" disappear on the LCD, then the new setting will
prevail. Press▼or▲more than 20 seconds to perform CO2
Single Calibration
Please note:
1. Make sure to place the CO2 controller in an environment
where CO2 concentration is stable.
2. After CO2 single point calibration process is completed, please
keep the CO2 controller in the same environment until the
CO2 measurement value displayed turns into the target CO2
value of CO2 single point calibration.
3. If CO2 concentration of the calibration environment is not
stable, or if the CO2 controller is moved away before its CO2
measurement display reaches the target value, then there might
be serious distortion to future CO2 measurements.
0~50000
450
-19
CO2 modification; CO
2
reading calibration at a certain point
between the monitor and a standard CO
2
gas sample. The
calibration can only be used in a small range.
-500~500PPM
0 PPM
-20
Temp modification
-118.0~100.0C/-212~212F
0
-21
Humi. modification
-100~100
0
-22
The maximum of CO
2
measurement and setting
1000~20000ppm
2000
-23
Temp. controlling ’s feasibility（just for DIP3=OFF,DIP4=ON）
0: PID anolog output;
1: PID anolog output when detect temp.< (setting temp.
- temp. differential); Anolog output maximum when
detect temp.>(setting temp.-temp. differential)
1
Note: The numbers blinking indicates it being setup, the numbers stop to blink to indicate the parameter confirmed.
RESET: Put the DIP1 to ON and press switch key for about 25 seconds until the monitor is off, then all the setting values return to the factory default..
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2
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