Indoor Air Quality (IAQ) is measure for the quality of air in interiors, the comfortable indoor environmental quality can make people feel fresh, work efficiency and good for the health. The CO2 concentration is the important factor of good indoor air quality. People breath in oxygen and breath out CO2, nowadays people often close the windows to avoid noise and enjoy the comfort living and working environment provided by air-conditioning systems, which results in the fact that the indoor concentration of CO2 is far higher than outdoor average. With the high CO2 concentration and non- proper ventilation, people will feel headaches, dull, drowsiness, lose of concentration and correspond to the high levels of dust, chemicals and bacteria in the air.
The SEU (Sensor Unit) should be placed in a room where the CO2 is likely to accumulate, such as a room where CO2 is stored, like an area with CO2 beverages. The large LCD displays the ambient CO2 concentration and the temperature.
The SEU has the "DIAG", "AL1", "AL2" "CALI", "ReFactSet" function. The "DIAG" function executes communication tests between the SEU and RDU. The user can do the calibration under the "CALI" mode when necessary. If data-setting is done incorrectly, the user can use the "ReFactSet" back to the original factory setting.
There have "“AL1" "AL2" two alarm levels, the alarm level is adjustable, the first alarm level is with parameter 0.5%, 1%, 1.5%, 2% , the default first alarm level is 1.5% . The second alarm level is with parameter 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, the default second alarm level is 3%.
When the ZG10U CO2 Monitor detects CO2 concentration that exceeds the first alarm level, the red 1 LED will blink and the buzzer will sound intermittently, the relay will be triggered. If the concentration of CO2 continues to rise above the second alarm level, the red 1 and red 2 LED’s will flash together and the tempo of the buzzer will increase. The green LED will light continuously when the power is normally supplied.
If the ambient CO2 concentration reaches the second alarm level, on SEU & RDU, there will be a safety notice "ESC" displays on the LCD, the fault yellow LED will blink, Careful action, such as ventilating the space, must be taken before entering the room where the SEU is placed.
To clear the flashing "ESC" from the LCD, use the "ReFactSet" to restore the unit to the original factory settings, or unplug the AC adapter and reconnect it to the power.
If the communication cable between the SEU & RDU doesn’t connect well, like the communication cable looses in the Input port, the fault LED of SEU will blink, reconnect the cable, if the cable is inserted into the output port, on RDU, after °C/ °F flashing one minute, the "Er7" will flash on LCD. Unplug the cable and plug it into the Input port. The unit will work normally after corrective action.
If cleaning places where the SEU is installed, first take off rubber cap off and putting it on the position of gas entry. Water will not enter into the SEU during cleaning. The following picture shows the position changes of the rubber cap.
Your safety is very important to us. To ensure to use the product correctly and safety, please read
these warnings and the entire User Manual before using the product. Otherwise, the protection provided by the equipment may be impaired. These warnings provide important safety information and should be observed at all times.
Please handle the device carefully; do not subject the product to impact or shock.
Do not submerge the product into water or any liquid. Water may cause electric shock, fire or malfunction
which may result in damage
Do not place the unit, or the adaptor near a heat source. Heat can cause distortion of the unit, which may
result in an explosion or fire.
Do not touch the exposed electronic circuitry of the device under any circumstances, as there is the
dangerous of electric shocks.
Please use the "DIAG" function to verify the communication between SEU and RDU, to make sure the
communication between SEU and RDU works normally.
Please make sure that the power adaptor is mounted by plug lock tightly, so the power adapter can not be
disconnected without using of mechanical tools.
Do not enter the room directly if there is safety notice "ESC" displays on the LCD of SEU & RDU.
Some careful and protective action must be taken before entering the room where the SEU is installed.
Please take care of cable connection between SEU and RDU. Make sure the cable from SEU is connected
into the INPUT port of RDU.
Please ensure the external power supply is normally supplied to ventilation fan while the relay is working. If
there has no normally power supply to the fan, the relay will not work, which may result in potential danger
To make sure to receive the maximum benefit from using this product, please observe the follow guidelines.
Repair - Do not attempt to repair the product or modify the circuitry by yourself. Please contact your local
dealer or a qualified repairman if the product needs servicing.
Cleaning - Disconnect the power before cleaning. Use a damp cloth. Do not use liquid cleaning agents
such as benzene, thinner or aerosols, as these will damage the device.
Maintenance – We recommend users to test the communication between the SEU and RDU under "DIAG" function to verify the working conditions for the SEU and RDU. If the four LED’s blink and the buzzer of SEU and RDU sound simultaneously, it indicates that SEU and RDU work normally. When the LCD displays a safety icon "ESC", please take immediate protective action to check if CO2 leakage has occurred. We suggest users to do the calibration and thorough function check once within two year to make sure that the ZG10U CO2 Monitor is working properly.
When power has been connected, the SEU and RDU will begin to monitor the CO2 concentration and the temperature. In order to the get the timely alarm safety information and meet the personal requirements, It is advisable to set up the customizing parameter when necessary.
1. Press "Enter" to switch between °C and °F temperature
Using the DIAG function
1. Press Mode until the "DIAG" icon flashes
2. Press Enter, the four LED’s will blink on the SEU and the
3. The four LED’s will blink and buzzer will sound simultane
Setting the First Alarm parameter
1. Press Mode until the "AL1" icon flashes
2. Press Enter, the "AL1" icon shows on LCD
3. Press Mode to go through "0.5%, 1%, 1.5%, 2%" alarm level
4. Press Enter again to save the setting after selection
Setting the Second Alarm parameter
1. Press Mode until the "AL2" icon flashes
2. Press Enter, the "AL2" icon shows on LCD
3. Press Mode to go through "1.5%, 2%, 2.5%, 3%, 3.5%, 4%" alarm level
4. Press Enter again to save the setting after selection
*Note: The second alarm level should be higher than the first alarm level when setting with the alarm level
Using the CALI function
1.Press Mode until the "CALI" icon flashes
2.Press Enter, the "CALI" icon shows on the LCD
3.Press and hold Mode for at least 10 seconds. The "CALIBRATING" icon will flash. The calibration will be
done automatically. After 10 minutes the LCD will display "Pass" or "Fail." If "Fail," please try again.
When do the calibration, it is suggested to take SEU outside, use the ambient gas for calibration and wait for around 10 minutes until the CO2 reading of SEU doesn’t change. Then, use the 380-420 ppm as the standard CO2 reading. Calibrating the unit according to "CALI" mode instruction, user should not breathe toward to SEU during the calibration process, as the CO2 from the user will affect the CO2 reading of SEU.
Using the ReFactSet function
1. Press Mode until the "CALI" icon flashes
2. Press Enter, and then press Mode to choose either "Yes" or "No"
3. Press Enter again to save the setting after selecting
*Note: If the user sets the data or calibrates the sensor incorrectly, use the ReFactSet (recover the factory
Setting) to come back the default factory setting.