Home > Products > Wall Mount CO2 monitor > ZGa21  
 
  Desktop
  ZG1163R
  ZG1583RUD
  ZG1683R(U)
  ZGm053U
  ZGkb301 / ZGkb201p
  ZGw08VRC
  ZGw063RY
  ZGw19C
  ZGh213
  ZG10U
  ZGa21
  ZG9 series
  ZG07
  ZG09
 
  ZGa21 SERIES - ZGa21enc (CO2+O2+Analog output)  
   
   
 
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, lose of concentration and correspond to the high levels of dust, chemicals and bacteria in the air.
 
 
Features & Display Features and Modes
 
 
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 and 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 be observed at all  times.
   
 
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 can not 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
 
 
To make sure to receive the maximum benefit from using this product, please observe the follow guidelines.
 
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 “AL1” icon flashes
  2. Press Enter, the “AL1” icon shows on LCD
  3. Press Mode to go through “ 5000ppm,1%,1.5%,2%” alarm level
  4. Press Enter again to save the setting after selection

Setting the CO2 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
            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
 
  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”, 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.
 
 
Specifications
 
 
  Method - Dual Beam NDIR
 

Sample Method - Diffusion or flow through (50 ~200 ml/min)

 
 
Performance - CO2
Measurement Range
 0~50,000ppm (5%) display
Display Resolution

 1ppm at 0~1,000ppm;
 10ppm at 1001~10,000ppm;
 100ppm at 10,001~50,000ppm

Accuracy  ±100ppm or ±5% of reading, whichever is greater
Repeatability
 ±20ppm @400ppm
Annual Drift  <20 ppm/Year@400ppm
Temperature Dependence
 ±0.2% of reading per °C or ±2ppm per °C,
 whichever is greater, refer­enced to 25°C
Pressure Dependence
 0.13% of reading per mm Hg
Response Time
 <60 seconds for 90% response to step change
AL1
(First Alarm Level)
 5000ppm, 1 / 1.5 / 2 % , Default AL1= 1.5%
AL2
(Second Alarm Level)
 1.5 / 2 / 2.5/ 3 / 3.5 / 4 % , Default AL2= 3%
Warm-Up Time
 <60 seconds at 22°C
Sound Alarm
 80db@10cm
Performance - O2
Measurement Range
 0 ~ 30% display
Resolution  0.1 %
Accuracy  Better than ± 3% of FS over 0.1 to 30%
Repeatability
 Less than ±1.0%
Response Time
 <30 seconds for 90% response to step change
AL1
(First Alarm Level)
 18%,18.5%,19%,19.5%,20%, Default AL1=19%
AL2
(Second Alarm Level)
 16%,16.5%,17%,17.5%,18%, Default AL2=17%
Power Supply
&
Relay Output
Power Supply  AC adapter 110/220 VAC
AC Input  Voltage  100 ~ 240 VAC
Frequency  50 / 60 Hz
Power Requirement
  1 W maximum @ 115 VAC 60 Hz
  2 W maximum @ 230 VAC 50 Hz
AC/DC Output Voltage  6VDC
Power  3.0 W
 Peak Input Current 0.5 A from 6 VDC
Analog output
(ZG10Un only)
Two channel linear current output 4~20mA for O2, RL<150Ω; 4~20mA for CO2, RL<150Ω.
 Relay Output Peak Current<2A@30VDC or 250VAC, SPDT for
CO2 / O2
Temperature specification

  Temperature Range: 0°C to 50°C ( 32°F to 122°F)
  Display Resolution: 0.1°C(0.1°F)
  Display Options: °C / °F
  Accuracy:±1°C(±2°F) when CO2 concentration is below first alarm level
  Response Time: 20-30 minutes (case must equalize with environment)
Operating Conditions
  Operating Temperature: 0°C to 40°C ( 32°F to 104°F), 0-95% RH, non-condensing
  Storage Temperature: -20 to 60°C ( -4 to 140°F)
Dimensions
  SEU: 170.0 ×126.0 × 63.0 mm (6.69 × 4.96 × 2.48 inch)  
  RDU: 80.0 × 110.0 × 35.7 mm (3.15 × 4.33 × 1.41 inch)  
Weight (including batteries):
  SEU: 459 grams( oz)
  RDU: 130 grams
Fault Codes & Troubleshooting Guide

This section includes a list of Frequently Asked Questions for problems you may encounter with the ZG10U CO2 Monitor.

No. LCD Fault Icon Description
(of the fault)
SEU Indication RDU Indication Suggested Actions
1 Er3 The ambient temperature has exceeded the temperature range 0°C to 50°C ( 32°F to 122°F) "Er3" flash Fault LED blink, Buzzer  beep “Er3” flash Fault LED blink, Buzzer  beep This error will disappear when the temperature returns to the range between 0°C and 50°C ( 32°F to 122°F)
2 Er4 some wrong measurement or the sensor has exceeded its expected life

"Er4" flash. Fault LED blink, Buzzer  beep

“Er7” flash. Fault LED blink, Buzzer  beep

Please unplug the AC adapter and reconnect it. If the “Er4” always appears, please contact with the local dealer.
3 Er5
Er6
EEPROM System Problem “Er5” & “Er6” flash, Fault LED blink, Buzzer  beep

“Er7” flash, Fault LED blink, Buzzer  beep

Please unplug the AC adapter and reconnect it. If the “Er5, Er6” always appear, please contact with the local dealer.
4 Er7 Internal Data Transmission Error “Er7” flash, Fault LED blink, Buzzer beep “Er7” flash, Fault LED Blink, Buzzer  beep

1. Please unplug the AC adapter and reconnected it.

2. Check the RJ45 plug is connected into the INPUT port of RDU,if the “Er7” displays on the RDU only.

5 Er8 The accuracy of CO2& O2 sensor may deviate from the actual concentration. “Er8” flash Fault LED   blink, Buzzer  beep “Er8” flash Fault LED blink, Buzzer  beep

1.Please unplug the AC adapter and reconnect it If the “Er8” still appears, please contact with the local dealer.

2. Please calibrate the unit, after the calibration, If the “Er8” still appears, please contact with the local dealer.

Kinds of Adapters for your option
ACAeu
(for European ,
including
GermanItaly )
ACAgb
(for British,
including
Singapore、
BS1363 )
ACAau
(for Australia
New Zealand)
ACAus
(for American ,
including
JP、CN)
Install: Uninstall:
Available Packages
  Dimensions: 170*126*60mm (SEU)
  Dimensions: 110*80*34.5mm (RDU)
  Weight:
  U.K Type: 1035g (SEU)
  EU Type: 1031g (SEU)
  U.S Type: 1023g (SEU)
  AU Type: 1025g (SEU)
  Weight: 115g (RDU)
  One Set Included:
 
1 CO2 Monitor
 
1 User Manual
 
1 Power Adaptor
 
1 White Box
     
     
  One Carton Included:
 
Q'ty: 5 pcs
 
White Box Size: 356*285*86mm
 
Carton Size: 465*380*330mm;
    2.06 CubeFt
 
N.W:
  U.K Type Power Cord: 7.575kg
  EU Type Power Cord: 7.531kg
  U.S Type Power Cord: 7.483kg
  AU Type Power Cord: 7.505kg
 
G.W:
  U.K Type Power Cord: 8.575kg
  EU Type Power Cord: 8.531kg
  U.S Type Power Cord: 8.483kg
  AU Type Power Cord: 8.505kg