Extech CO250 User Manual (English)
Contents
1. limit and temperature scale In the normal mode press and hold the ser button for more than 1 sec to enter the setup mode To exit the setup mode press the CAL Esc button vvhen either P1 0 or P3 0 is displayed P1 0 CO2 ALARM Limit When entering setup mode P1 0 and AL are displayed Press the MN AV button to scroll to P1 1 for setting CO2 alarm threshold The current CO2 set value will be blinking AL Pi CO2 CO2pPpm JINNN L a PU A PU Press the MODE A button to increase or the DP WBT Y button to decrease the value Each press adjusts 100 ppm The alarm range is from 100 to 9900ppm When the preferred alarm value is set press the MN AV button to exit and save the setting or the CAL Esc button to exit without saving and return to P1 0 P3 0 TEMPERATURE SCALE Press the MODE A button or the DP WBT Y button in P1 0 to access P3 0 for setting the temperature scale Press the MN AV button to go into P3 1 for setting the temperature units The currently selected units C or F will be blinking in the display To switch units press the MODE A button Press the MN AV button to save the setting or press the CAL Esc button exit without saving and return to P3 0 Un IP39 tne Ps CO250 EU EN v1 5 12 13 Calibration CO2 CALIBRATION The meter is calibrated to a standard 400ppm CO2 concentration at the factory NOTE VVhen the accuracy becomes a concern2. lovver left display and Humidity lovver right display In STEL and TVVA modes the main display shows the vveighted average of CO2 readings for the past 15 minutes STEL or 8 hours TVVA The lovver displays are the current measurements STELCO2ppm 24163 NOTE 1 If the meter has been powered on for less than 15 minutes the STEL value will be the weighted average of readings taken since power on As well the TWA mode will display a weighted average of readings prior to 8 hours of operation 2 The CO250 takes at least 5 minutes to calculate STEL and TWA The display shows during the first 5 minutes from power on STELCO2PPM 81033 3 The STEL and TWA values will keep updating every 5 minutes ALARM The meter features an audible alarm to give warnings when CO2 concentration exceeds the set limit It emits beeps Abt 80dB when CO2 level goes over the set value and stops when any key except Qser is pressed or the readings fall belovv the set value It beeps again if the value exceeds the limit Restart the meter if the beeper will not stop AUTO POVVER OFF The meter turns off automatically after 20 minutes of inactivity To override the function press and hold down the Oset and HOLD buttons until n appears in the display approx 2 seconds while turning on the meter on NOTE Auto sleep function will be disabled during calibration mode 4 CO250 EU EN v1 5 12 13 SETUP alarm
3. N AV button to enter 75 calibration AL lt li 3 CAL and calibrating value 75 2 if at 25 C will blink on the LCD Ce with current temperature at the left CG xi S2 4 The meter is now calibrating Wait about 60 minutes until the blinking stops then calibration is completed and the meter will return to normal mode NOTE Single point calibrations are allowed To calibrate 33 only press CAL Esc and exit when 33 calibration is completed To calibrate 75 only press MODE A within the 5 minutes while initializing 33 calibration PC CONNECTION The meter is equipped with an RS 232 PC interface jack 3 5mm phono for connection to a PC The supplied cable and Windows compatible software allows the user to store readings in a text file and display real time measurements in a series of selectable formats For more information or specific operating instructions refer to the User Guide included with the software 6 CO250 EU EN v1 5 12 13 Specifications Function Range Resolution 0 to 5000ppm 1ppm 5rdg 50ppm CO2 5000 to 9999ppm 1ppm Pressure dependence 1 6 reading per kPa deviation from normal pressure 100kPa 10 to 60 C 5 Temperature 14 to 140 F 0 1 DE ss 5 3 10 to 90 Humidity 0 0 to 99 9 0 1 45 lt or gt 10 to 90 5 to 60 C Wet Bulb 23 to 140 F gal Calculated from RH and 3 20 to 60 C Dew Point A to 140 F 0 1 Display Triple LCD wi
4. User s Guide EXT INSTRUMENTS CO Meter Model CO250 C0250 Meter 42 HUMIDITY THERMOMETER Introduction Congratulations on your purchase of this Model CO250 Meter This meter measures CO2 Carbon Dioxide levels air temp dew point wet bulb temperature and humidity and is an ideal instrument for indoor air quality IAQ diagnosis This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Meter Description METER 1 OS OB ND Temperature and Humidity sensor CO2 sensor rear LCD display AC Adaptor connector RS232 port Reypad Battery compartment rear LCD DISPLAY AVG 1 2 3 m s CO2 concentration in ppm Relative Humidity in HOLD TWASTELCO2PPM MIN LDDP AIR WET 1 888 Air Temperature Dew Point or Wet Bulb Temperature SYMBOLS TWA STEL HOLD MIN KEYPAD 8 8 8 b MAX Minimum Maximum readings Low battery indicator Dew point temperature Air temperature Wet bulb temperature Unit of relative humidity F Celsius Fahrenheit Turns the meter on and off Enters setup mode Sets as non sleep mode with Exits setup page mode Enters CO2 calibration with de Enters RH calibration with Freezes the current reading on display Cancels data hold function Activates or cancels the backlight Selects unit or increase
5. forms a 30 second countdown for meter warm up It then enters the normal operation mode with current CO2 temperature and humidity readings displayed COP pM 63 AR BX TARING MEASUREMENT The meter starts measurements vvhen povvered on and updates readings every second If the operating environment changes ex from high to low temp it takes 30 seconds for CO2 sensor to respond and 30 minutes for RH NOTE Do not hold the meter close to your mouth or any other source of CO2 AIR DP and WBT Measurements Press the DP WBT button to switch temperatures display The lower left display will cycle from AIR air temperature DP dew point temperature and WBT wet bulb temperature DATA HOLD Press the HOLD button to freeze the readings the HOLD icon is displayed on the left top of the display All current readings are held unchanged except STEL and TWA Press HOLD again to cancel the hold function BACKLIGHT Press the MODE A button for more than 1 second to activate or to cancel backlight function 3 CO250 EU EN v1 5 12 13 MIN MAX STEL TWA In the normal mode press the Max AV button to see the minimum maximum and weighted average readings VVith each press of the Max AV button the meter displays MIN MAX STEL TVVA in sequence and then returns to the normal mode In MIN and MAX modes the meter shows the minimum and maximum readings of CO2 main display AIR DP or VVB temperatures
6. or after a year of use return to Extech for a standard calibration CAUTION Do not calibrate the meter in an atmosphere of unknown CO2 concentration 1 Place the meter in the 400ppm calibration chamber Turn the meter on m and hold down the CAL Esc and MODE A buttons simultaneously to or enter CO2 calibration mode 400ppm and CAL will blink on the LCD 4 while performing calibration irae 2 Wait about 5 minutes until the blinking stops The calibration is then J CAL completed and the meter automatically returns to the normal mode NOTE Ensure the batteries are fresh prior to calibration to prevent an interruption or failed calibration RH CALIBRATION The meter is calibrated to a standard 33 and 75 salt solution bottle CAUTION Do not calibrate the humidity without the default calibration salt Otherwise permanent damage could occur Contact the Extech for calibration salts or services 33 calibration 1 Plug the sensor probe into 33 salt bottle 2 In the normal mode Press and Hold the CAL Esc and DP WBT buttons to enter the 33 calibration CAL and calibrating value 32 7 if at 25 C will blink on the LCD with current temperature at the left 3 The meter is now calibrating and will finish in about 60 minutes when CAL and humidity stop blinking 75 calibration 1 After the 33 calibration plug the sensor probe into a 75 salt bottle ne 4 2 Press the M
7. s value in setup Selects AIR DP WBT temps display Selects unit or decreases value in setup Activates MIN MAX STEL TWA function Saves and finishes settings Time weighted average 8 hours Short term exposure limit 15 minutes weighted average Freezes current reading on display 3 Mata Tail se 7635248 CO250 EU EN v1 5 12 13 Operation BATTERY INSTALLATION The meter is povvered by 4 AA batteries or a DC adaptor Install the batteries into the rear battery compartment observing correct polarity VVhen an adaptor is used the batteries vvill be disconnected from the meter The adaptor cannot be used as a battery charger VVhen the battery voltage drops below the required level Ll and Lob will appear on the display a beeper sounds and readings are no longer displayed Press any key but the Oser to stop the beeps Replace the batteries to resume normal operation Cozppm Lob You as the end user are legally bound EU Battery ordinance to return all used batteries disposal in the household garbage is prohibitedi You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Ey Disposal Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle POWER ON OFF Press Oser to turn the meter on and off At power up the meter emits a short beep and per
8. th backlight Sensor Type CO2 NDIR non dispersive infrared technology Operating Conditions Storage Conditions Power Supply Battery Life Dimensions Weight Humidity Capacitance sensor Temperature air Thermistor 0 to 50 C 32 to 122 F lt 95 RH non condensing 20 to 60 C 4 to 140 F lt 99 RH non condensing 4x 1 5V AA batteries or AC adaptor 9V 1A approx 24 hours alkaline batteries 200x70x57mm 7 9x2 7x2 3 190g 6 7 oz CO250 EU EN v1 5 12 13 Maintenance CLEANING AND STORAGE 1 The meter should be cleaned with a damp cloth and mild detergent when necessary Do not use solvents or abrasives 2 Store the meter in an area with moderate temperature and humidity refer to the operating and storage range in the specifications chart earlier in this manual TROUBLESHOOTING Can t power on Press Oser for more than 0 3 seconds and try again Check that the batteries have good contact and the correct polarity or that the AC adaptor is properly connected Slow response Check whether the air flow channels on the rear of the meter are blocked Error messages E01 CO2 sensor damaged E02 The value is under range E03 The value is over range E04 The original data error results in this error DP WB E07 Too low voltage to measure CO2 replace batteries or use an adaptor E11 Retry humidity calibration E17 Retry CO2 calibration E31 Temperature sensor damaged E34 Humidit
9. y sensor damaged CO2 Levels and Guidelines Non Enforced Reference levels e 250 350 ppm background normal outdoor air level e 350 1 000 ppm typical level found in occupied spaces with good air exchange e 1 000 2 000 ppm level associated with complaints of drowsiness and poor air e 2 000 5 000 ppm level associated vvith headaches sleepiness and stagnant stale stuffy air Poor concentration loss of attention increased heart rate and slight nausea may also be present e 25 000 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 should not exceed 1000ppm OSHA 5000ppm Time vveighted average over five 8 hour work days should not exceed 5000ppm Building bulletin 101 Bb101 1500ppm UR standards for schools say that CO2 at averaged over the whole day i e 9am to 3 30 pm should not exceed 1500ppm Germany Japan Australia UR 5000ppm 8 hours weighted average in occupational exposure limit is 5000ppm Copyright O 2013 FLIR Systems Inc All rights reserved including the right of reproduction in whole or in part in any form www extech com 8 CO250 EU EN v1 5 12 13
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