CO2 Meter
Contents
1. Storage Conditions 4 to 140 F 20 to 60 C lt 99 RH non condensing Power Supply 4 x 1 5V AA batteries or AC adaptor 9V 1A Battery Life approx 24 hours alkaline batteries Dimensions Weight 7 9 2 7 2 3 200x70x57mm 6 7 oz 1909 8 CO250 V1 2 1 09 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 CALIBRATION AND REPAIR SERVICES Extech offers repair and calibration services for the products we sell Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy TROUBLESHOOTING Can t power on Press Dser 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 cal2. 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 M IAA RL ptt ities in TPU Press the MODE A button to increase or the DP WBT 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 Uni Une 1932 03 6 0250 1 2 1 09 Calibration CO2 CALIBRATION The meter is calibrated to a standard 400ppm CO2 concentration at the factory NOTE When the accuracy becomes a concern 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 the meter in the 400ppm calibration chamber Turn the meter on and hold down the CAL Esc and MODE A buttons simultaneou
3. 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 339 calibration is completed To calibrate 7596 only press MODE A within the 5 minutes while initializing 3396 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 7 CO250 V1 2 1 09 Specifications Function Range Resolution Accuracy 0 to 5000ppm 1ppm 50ppm 5 rdg 5000 to 9999 1ppm Not specified Pressure dependence 1 6 reading per kPa deviation from normal pressure 100kPa 10 to 60 d o o Temperature 44 to 140 F 0 1 0 6 C 0 9 F 3 10 to 90 Humidity 0 0 to 99 9 0 1 5 lt or gt 10 to 90 5to 60 Wet Bulb 23 to 140 F 9 Calculated from RH and 20 to 60 Temperature Dew Point 4 to 140 F 0 1 Display Triple LCD with backlight Sensor Type CO2 NDIR non dispersive infrared technology Humidity Capacitance sensor Temperature air Thermistor Operating Conditions 32 to 122 F 0 to 50 C lt 95 RH non condensing
4. ENT The meter starts measurements when powered 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 X button for more than 1 second to activate or to cancel backlight function 4 CO250 V1 2 1 09 TWA In the normal mode press the Max AV button to see the minimum maximum and weighted average readings With each press of the Max AV button the meter displays MIN MAX STEL TWA 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 WB temperatures lower left display and Humidity lower right display In STEL and TWA modes the main display shows the weighted average of CO2 readings for the past 15 minutes STEL or 8 hours TWA The lower displays are the current measure
5. User s Guide EXTECH INSTRUMENTS A FLIR COMPANY CO Meter Model CO250 60250 Meter 2 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 Warranty EXTECH INSTRUMENTS CORPORATION A FLIR COMPANY warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any impl
6. ibration E17 Retry CO2 calibration E31 Temperature sensor damaged E34 Humidity sensor damaged 9 CO250 V1 2 1 09 CO2 Levels and Guidelines Non Enforced Reference levels 250 350 ppm background normal outdoor air level 350 1 000 ppm typical level found in occupied spaces with good air exchange 1 000 2 000 ppm level associated with complaints of drowsiness and poor air 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 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 weighted average over five 8 hour work days should not exceed 5000ppm Building bulletin 101 Bb101 1500ppm UK 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 UK 5000ppm 8 hours weighted average in occupational exposure limit is 5000 Copyright 2009 Extech Instruments Corporation a FLIR company All rights reserved including the right of reproduction in whole or in part in any form 10 CO250 V1 2 1 09
7. ied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied T Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com 2 CO250 V1 2 1 09 Meter Description METER LCD DISPLAY 1 2 3 Temperature and Humidity sensor CO2 sensor rear LCD display AC Adaptor connector RS232 port Keypad Battery compartment rear HOLD TWASTELCO2pp m MIN CO2 concentration in ppm MAX 1 1 Relative Humidity fim m s Air Temperature Dew Point or qu PL RR Wet Bulb Temperature 8 995 2 SYMBOLS TWA Time weighted average 8 hours 3 STEL Short term exposure limit 15 minutes weighted average HOLD Freezes current reading on display MIN MAX Minimum Maximun readings r3 DP AIR WBT or KEYPAD se 9 9 E Low battery indicator Dew point temperature Air temperat
8. ments STELCO2ppm 8 633 NOTE 1 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 91633 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 ser is pressed or the readings fall below the set value It beeps again if the value exceeds the limit Restart the meter if the beeper will not stop AUTO POWER OFF The meter turns off automatically after 20 minutes of inactivity To override the function press and hold down the ser and HOLD buttons until appears in the display approx 2 seconds while turning on the meter on NOTE Auto sleep function will be disabled during calibration mode 5 CO250 V1 2 1 09 SETUP alarm limit and temperature scale In the normal mode press and hold the button for more than 1 sec to enter the setup mode To exit the setup mode press the CAL Esc button when either P1 0 or P3 0 is displayed P1 0 CO2 ALARM Limit When
9. sly to enter CO2 calibration mode 400ppm and CAL will blink on the LCD while performing calibration 2 2 Wait about 5 minutes until the blinking stops The calibration d LRL is then completed and the meter automatically returns to the BN normal mode Cozppm 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 3396 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 normal mode Press and Hold the CAL Esc and DP WBT Y buttons to enter the 33 calibration CAL and calibrating value 32 796 if at 25 C will blink on the LCD with current temperature at the left BL 3 The meter is now calibrating and will finish in about 60 minutes ase when CAL and humidity stop blinking 25 333 75 calibration 1 After the 33 calibration plug the sensor probe into a 75 a salt bottle t Press the MN AV button to enter 75 calibration AIR CAL and calibrating value 75 2 if at 25 C will blinking on 251 He the LCD with current temperature at the left a 4 The meter is now calibrating Wait about 60 minutes until the blinking
10. ure 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 5 Enters RH calibration with Freezes the current reading on display Cancels data hold function Activates or cancels the backlight Selects unit or increases 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 3 CO250 V1 2 1 09 INSTALLATION The meter is powered by 4 AA batteries or a DC adaptor Install the batteries into the rear battery compartment observing correct polarity When an adaptor is used the batteries will be disconnected from the meter The adaptor cannot be used as a battery charger When the battery voltage drops below the required level and Lob will appear on the display a beeper sounds and readings are no longer displayed Press any key but the ser to stop the beeps Replace the batteries to resume normal operation i CO ppm Lob POWER ON OFF Press Dser to turn the meter on and off At power up the meter emits a short beep and performs a 30 second countdown for meter warm up It then enters the normal operation mode with current CO2 temperature and humidity readings displayed 0 81637 TAKING MEASUREM
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