ZyAura ZGA21 User manual

SEU (Sensor Unit)
A.
LCD display
B.
Buzzer
C
Green LED (Power indication)
D.
Red 1 LED( AL1 )
E.
Red 2 LED( AL2
)
F.
Yellow LEDFaultindication)
G.
Reset Button
H.
Enter Button
I.
Mode Button
J.
CO2 Relay output (red& white: NO,blue& white:
NC)
K.
O2 Relay output (red& white: NO,blue& white: NC)
L.
Analog output (red&white:CO2,blue &white:O2)
M.
Communication Cable to RDU
N.
Power Supply
O.
CO2 entry
P.
O2 entry
RDU (Remote Unit)
Q.
Green LED (Power indication)
R.
Red 1 LED (AL1)
S.
Red 2 LED (AL2)
T.
Yellow LED (Fault indication)
U.
LCD display
V.
Mode Button
W.
Enter Button
X.
Buzzer
Y.
RJ45 Plug for next RDU (Output)
Z.
RJ45 Plug
for SEU (Input)

General Introduction
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, loss of
concentration and correspond to the high levels of dust, chemicals and bacteria in the air.
Features & Display Features and Modes
Features & Display Features
Modes
Dual Beam NDIR (Non-Dispersive Infrared) technology is used to
measure CO2 concentration up to 50,000 ppm (parts per million) and
electrochemical technology to measure O2 concentration up to 30%.
With the SEU (Sensor Unit) and RDU (Remote Display Unit), it can
connect up to 3 RDU for safety notices.
Large digital LCD display clearly indicates the ambient CO2、O2(optional)
Concentration and Temperature.
Relay output can automatically control a fan to ventilate confined spaces.
Audible and Visual Alarm indications.
IP54 Water Proof Protection of SEU (Sensor Unit) except backside when
installed on the wall.

LCD Display Symbol
Symbol
Meaning
Description
CO2 Concentration ppm (Parts Per
Million)
ambient CO2 concentration
O2 Concentration
ambient O2 concentration
Alarm
alarm icon
Diagnose
Test communications between the SEU and
RDU
CO2/O2 First Alarm level
The relay will be triggered when CO2
concentration exceeds the first alarm level or O2
concentration drops the first alarm level, the Red
1 LED will flash, and buzzer will sound.
CO2/O2 Second Alarm level
Safety Notice “ESC” displays on LCD when CO2
concentration exceeds the second alarm level or
O2 concentration drops the second alarm level.
The Red 1& Red 2 LEDs will flash, and buzzer
will sound.
Calibration
To calibrate the CO2 sensor /O2 sensor when
the accuracy deviates from the actual CO2/O2
concentration.
Recover Factory Setting
To recover factory default settings and cancel
any customized settings.
ESC
To indicate the CO2 leakage once the CO2 level
is above the second alarm level.
Hi
The CO2 concentration is above 5%, or the O2
concentration is Higher than 30%.
Fan
If CO2<Alarm1 and O2 >Alarm1, there is no fan
running; If CO2 >Alarm1 or O2<Alarm1, fan will
run.
SEU (Sensor Unit) Function Instruction
The SEU (Sensor Unit) should be placed in a room where the CO2 is likely to accumulate or O2 reduce, such as
a room where CO2 is stored, like an area with CO2 beverages. The large LCD displays the ambient CO2 & O2
concentration.
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 of CO2 is with
parameter 5000ppm, 1%, 1.5%, 2%, the default first alarm level is 1.5% ; the first alarm level of O2 is with
parameter 18%,18.5%,19%,19.5%,20%, the default first alarm level is 19%.The second alarm level of CO2 is
with parameter 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, the default second alarm level is 3%; the second alarm level of
O2 is with parameter 16%,16.5%,17%,17.5%,18%, the default second alarm level is 17%.

When the ZGa21 CO2 &O2 Monitor detects CO2 concentration exceeds the first alarm level or O2 concentration
drops the first alarm level, the red 1 LED will blink and the buzzer will sound intermittently, the relay will be
triggered. When CO2 concentration drops the first alarm level, or O2 concentration rise to the first alarm level, the
red 1 LED will stop blinking and buzzer will stop beeping.
If the concentration of CO2 continues to rise above the second alarm level, or the concentration of O2 drops the
second alarm level, the red 1 and red 2 LED’s will flash together, the tempo of the buzzer will increase. When
CO2 concentration drops below the second alarm level, even to the first alarm level, the red 1 and red 2 LED’s
will remain blinking, and the buzzer will remain beeping (This function is latch design. Based on DIN6653-2).
Unless the ZGa21 is restarted, by means of reset button of ZGa21 or unplug the AC adapter and reconnected it.
The green LED will light continuously when the power is normally supplied.
Warning: If the ambient CO2 concentration reaches the second alarm level on SEU & RDU, there will be a
safety notice “ESC” displays on the LCD, Careful action, such as ventilating the space, must be taken before
entering the room where the SEU is placed.
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 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.
RDU (Remote Display Unit) Function Instruction
The RDU (Remote Display Unit) should be placed outside the room when in use.
The RDU is connected to the SEU with a wire that has a maximum length of 8 meters (26 feet).The RDU should
be placed where it can be conveniently observed before entering the room where the SEU is located. The RDU is
a repeater, and displays the measurements made by the SEU on an easy-to-read digital LCD along with
important safety information.
The RDU has “DIAG” function. The “DIAG” can test the communication between the SEU and RDU. Resetting
the ZGa21 CO2 and O2 Monitor is only available from SEU.
Safety Notes
Warning: 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 always be
observed.
1. Please handle the device carefully; do not subject the product to impact or shock. Otherwise, this may
cause the accuracy drift.
2. 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.
3. Do not touch the exposed electronic circuitry of the device under any circumstances, as there is the
dangerous of electric shocks.
4. Please use only the included power adaptor. Improper power adaptor or power sources can cause
serious damage to the product or result in injury or death to the user.
5. Please use the “DIAG” function to verify the communication between SEU and RDU, to make sure the
communication between SEU and RDU works normally.
6. Please make sure that the power adaptor is mounted by plug lock tightly, so the power adapter cannot
be disconnected without using of mechanical tools.
7. Do not enter into the room directly if there has 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.
8. Please take care of cable connection between SEU and RDU. Make sure the cable from SEU is
connected into the INPUT port of RDU.
9. 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 with high CO2 concentration or low O2 concentration in confined space.

Caring for Product
1. 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, including the replacement or
calibration of sensor.
2. Note: The oxygen sensor must be replaced every 3 years.
3. 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.
4. Maintenance –We recommend users to test the communication between the SEU and RDU under
‘DIAG” function to verify the working conditions or 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 years to make sure that the ZGa21 CO2 and O2 Monitor is working properly.
Installation Instruction
Please carefully take out the SEU (Sensor Unit), RDU (Remote Display Unit), panel holders, network cable
connector,7 meters communication cable, user manual, plug lock, screws,expansion plugs, nail cable clips,
warning paper from the package.
Step-by-Step Installation:
1. Choose a suitable location to install the SEU. Fix the panel holder on the wall with the four screws
(included); the recommend installation height is about 0.45 meters (1.5 feet) from floor and close to the
manifolds and valves as possible.
2. Put the SEU on the panel holder, making sure that they are connected tightly.
3. Fix another panel holder in a suitable location outside the monitored space with screws (included). Push
the RDU onto panel holder, and stick the warning paper next to RDU.
4. The communication cable is pre-wired to the SEU. Route the cable to the RDU and fixed the
communication cable to the wall by nail cable clips, and then plug the cable into the input port on the
RDU. Communication is now ready between the SEU and RDU.
5. The ZGa21 CO2 and O2 Monitor has two relay output: one is for CO2 and the other is for O2. The relay
cable is pre-wired to SEU. The relay can control a fan or blower to ventilate the monitored space when
necessary and the relay will be triggered when the CO2 concentration exceeds the first alarm level or
O2 concentration drops the first alarm level.
6. After finishing the installation, Connected the AC power adapter into the electrical supply outlet. Mount
the Plug lock by expansion plugs so that the power adapter cannot be disconnected without use of
mechanical tools.
7. When the power has been connected, The SEU and the RDU will begin to work. Please use the “DIAG“
function to verify the communication between SEU and RDU, the four LED’s will blink and buzzer will
sound on SEU & RDU, after that the communication is ready, the content of display is same on SEU &
RDU.

Mount the plug lock
Customizing Settings
When power has been connected, the SEU and RDU will begin to monitor the CO2 & O2 concentration. 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.
Temperature °C/°F
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 buzzer will sound
3. The four LED’s will blink and buzzer will sound simultaneously on the RDU
Setting the CO2 First 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
parameter.

Setting the O2 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 “18%,18.5%,19%,19.5%,20%” alarm level
4. Press Enter again to save the setting after selection
Setting the O2 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 “16%,16.5%,17%,17.5%,18%” alarm level
4. Press Enter again to save the setting after selection
*Note: The second alarm level should be lower than the first alarm level when setting with the alarm level
parameter.
Using the CO2 CALI function
1. Press Mode until the “CALI” icon flashes.
2. Press Enter, the “CALI” and “ZEro” icons show on the LCD. Press and hold Mode for at least 10
seconds, “CALIBRATING” and “ZEro” icons will flash simultaneously. The calibration will be done
automatically. After about 3 minutes the LCD will display “Pass” or “Fail”. If “Fail”, please try again.
3. Press Enter, the “CALI” and “SPAn” icons show on the LCD, press and hold Mode for at least 10
seconds, “CALIBRATING” and “SPAn” icon will flash simultaneously and the calibration will be done
automatically. After about 3 minutes the LCD will display “Pass” or “Fail”. If “Fail”, please try again.
*Note: When do the calibration, When do the “ZEro” Calibration, please enter through N2. When do the “SPAn”
Calibration, please enter through 4% CO2 gas. Before doing “ZEro”/” SPAn” calibration, it will take about 5 min to
enter through CO2 to stabilize. When do “ZEro”/” SPAn” calibration, the reading is beating too often and
calibration fails.

Using the O2 CALI function
1. The O2 CALI function is as same as CO2’s.
*Note: When do the calibration, When do the “ZEr” Calibration, please enter through N2. When do the “SPA”
Calibration, please enter through 21% O2 gas. Before doing “ZEr”/” SPA” calibration, it will take about 5 min to
enter through O2 to stabilize. When do “ZEr”/” SPA” calibration, the reading is beating too often and calibration
fails.
Using the ReFactSet function
1. Press Mode until the “ReFactSet” 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.