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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. 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for ZGA21

Page 1: ... 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 ...

Page 2: ...entilation 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...

Page 3: ...ve 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...

Page 4: ...ere 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 ...

Page 5: ...x 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 st...

Page 6: ...sing 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 ...

Page 7: ...r 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 si...

Page 8: ...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 re...

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