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Extech Instruments CO220, User Manual

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Extech Instruments CO220 User Manual Download Page 7

                                                      7          CO220-en-US_V1.5   8/20 

CO

2

 DISPLAY PAGES 

Press the CO

2

 button to change the CO

2

 display page on the top-tier 

LCD area. The pages are shown below for CO

2

, Max-Min, TWA, STEL, 

IPS% and cfm/p. 

 

TIME WEIGHTED AVERAGE (TWA) 

TWA is Time Weighted Average (8 hours); the meter updates the 
reading every 60 seconds. If the meter has been powered on for less 
than 8 hours, the TWA value will be the weighted average of readings 
taken since the unit was powered ON. 

 

 

Summary of Contents for CO220

Page 1: ...USER MANUAL CO2 Monitor and Datalogger Model CO220 Additional User Manual Translations available at www extech com ...

Page 2: ...ural ambient air is approximately 0 04 or 400ppm This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Please visit our website www extech com to check for the latest version of this User Guide Product Updates and Customer Support FEATURES Extra Large LCD simultaneously displays CO2 Level Air Temperature Relative Humidity Displayed Calendar Cl...

Page 3: ... CO2 reading 2 Relative Humidity Reading 3 Air Temperature Reading 4 Time Date Display 5 SET button 6 ESC MEM button 7 SELECT RECALL button 8 C F RH button 9 CO2 button 10 AC adaptor jack NOTE CO2 Temperature and RH sensors on rear of instrument ...

Page 4: ...1000ppm 1000ppm to 2500 ppm 2500ppm to 5000ppm 5000ppm and above Air Temp Air Temperature TWA Time Weighted Average 8 hrs STEL Short Term Exposure Limit 15 minute weighted average IPS Liters per second per person cfm p Cubic feet per minute per person WB Wet Bulb temperature DP Dew Point temperature MAX MIN Maximum or Minimum reading ...

Page 5: ...he AC adaptor into the meter and into an AC source The meter will switch ON with a short beep Please use an appropriate power source 100 to 240VAC 50 60Hz The AC adaptor s output voltage is 7 5 to 9 0V and its output current is 0 5A Use of 3rd party AC adaptor can damage the meter The LCD will display the current CO2 concentration air temperature relative humidity date and time date and time toggl...

Page 6: ...nge for example a low to high temperature swing please allow 30 seconds for CO2 readings and 30 minutes for Relative Humidity readings to stabilize NOTE Do not hold the meter close to the mouth or any other source of CO2 CHANGE THE TEMPERATURE UNITS o C o F The change the displayed temperature units of measure 1 Press and hold the SET button 2 While holding the SET button press the oC oF button 3 ...

Page 7: ...The pages are shown below for CO2 Max Min TWA STEL IPS and cfm p TIME WEIGHTED AVERAGE TWA TWA is Time Weighted Average 8 hours the meter updates the reading every 60 seconds If the meter has been powered on for less than 8 hours the TWA value will be the weighted average of readings taken since the unit was powered ON ...

Page 8: ...ased demand controlled ventilation refers to the practice of using carbon dioxide concentrations as an indicator for a per person ventilation rate In this context CO2 is monitored as a byproduct of respiration rather than as an indoor contaminant The rate at which people produce CO2 varies with diet and health as well as with the duration and intensity of physical activity The more exertion an act...

Page 9: ... with date time stamp The meter will emit a short beep and the memory location number will replace the RH reading for 2 seconds before returning to the RH reading Once the memory is full the meter will overwrite the first data point stored and continue to overwrite existing readings as new readings are stored To recall the data use the SELECT RECALL button The middle tier display will show the mem...

Page 10: ...Setting Date When the two digit date appears on LCD press SELECT to increase the date Press SET button to save and move to the next setting Setting Hours When the two digit hour appears on the LCD press SELECT to increase the hour Press SET to move to the next setting Setting Minutes When the two digit minutes value appears on the LCD press SELECT to increase the minutes Press SET to move to the n...

Page 11: ...ine Calibration establishes a baseline calibration to eliminate the zero drift of the infrared sensor The ABC function is always ON when the meter is ON ABC is designed to calibrate the meter at the minimum CO2 reading detected during 7 5 days continuous monitoring with power on It assumes that the area being tested receives fresh air with a CO2 level of approximately 400ppm at some period of time...

Page 12: ... 0 1 3 10 to 90 5 10 or 90 25 C Display 3 tier Multi function LCD Sensor Type CO2 NDIR non dispersive infrared technology Humidity Capacitance sensor Temperature air Thermistor Datalogging 99 points Operating Conditions 32 to 122 F 0 to 50 C 5 to 80 RH Storage Conditions 4 to 122 F 20 to 50 C 5 to 90 RH Power Supply 9VDC universal plug adapter Dimensions 6 1 x 3 4 x 3 2 155 x 87 x 81 5mm Weight 6 ...

Page 13: ...s damaged Return for repair E 2 Humidity sensor is damaged Return for repair E 3 Temperature sensor is damaged Return for repair E 4 Operating temperature is too high Put the meter in typical room temperature for 30 minutes if problem persists return for repair E 5 Operating temperature is too low Put the meter in typical room temperature for 30 minutes if problem persists return for repair E 6 Ha...

Page 14: ...ir 2 000 5 000 ppm level associated with headaches sleepiness and stagnant stale stuffy air Poor concentration loss of attention increased heart rate and slight nausea may also be present 5 000 ppm Exposure may lead to serious oxygen deprivation resulting in permanent brain damage coma and even death Regulatory exposure limits ASHRAE Standard 62 1989 1000ppm CO2 concentration in occupied building ...

Page 15: ...ration for most of our products Contact us for information on calibration and repair availability refer to the contact information below Annual calibrations should be performed to verify meter performance and accuracy Product specifications are subject to change without notice Please visit our website for the most up to date product information www extech com Contact Customer Support Customer Supp...

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