User Guide Wall-Mount CO2 Monitor Model CO230
Introduction Thank you for selecting the Model CO230 Carbon Dioxide Monitor. This meter measures CO2 concentration, air temperature, dew point, wet bulb temperature and relative humidity. The audio-visual alarm and alarm relay output make this is an ideal instrument for indoor air quality (IAQ) diagnostics. Carbon dioxide (CO2) is a gaseous component of the earth’s atmosphere. The concentration of CO2 in natural ambient air is approximately 0.04% or 400ppm.
Descriptions Meter Description 1. 2. 3. 4. 5. 6. 7. 8. Temperature/RH sensor Main Display Alarm Relay Output Aux. Displays 12V AC Adaptor jack Keypad Alarm alert lamp CO2 sensor Note: Wall mount hole and relay wiring screws are located on the back Display Description 1. CO2 concentration (ppm) 2. Relative Humidity (%) 3.
Keypad Description SET Meter ON/OFF power Setup mode Save settings CAL/ESC CO2 calibration with ▲/DP WB RH calibration with MXN/AVG/▼ Exit setup mode RESET Reset the meter and clear MAX/MIN readings Terminate Calibration ▲/DP WB Selects AIR, DP, or WBT temperature display Selects units or increases value in calibration and setup MXN/AVG/▼ Activates MIN, MAX, STEL, TWA functions Select mode or decrease value in calibration and setup Operation POWER ON/OFF The meter is powered by a 12VDC adaptor.
TAKING MEASUREMENTS The meter starts to measure when powered on and readings update every second. If the operating environment changes (from high to low temperature, for example) the meter requires 30 seconds for the CO2 sensor and 30 minutes for the RH sensor to stabilize. NOTE: Do not obstruct the sensors or hold the meter close to the mouth or any source of CO2 when measuring.
NOTES: 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. The TWA mode will display a weighted average of the readings taken during the prior 8 hours of operation. 2. The CO230 requires at least 5 minutes to calculate STEL and TWA values. The display shows “----” during this time. ALARM OVERVIEW Audio-visual alarms give warnings when CO2 concentration exceeds the high limit.
SETUP MODE (for Alarm limits and Temperature units) In normal mode, press and hold SET to enter the setup mode. To exit the setup mode, press CAL/ESC when P1.0, P3.0, or P4.0 is displayed. P1.0 CO2 ALARM Upper and lower limit When setup mode is accessed, P1.0 and “AL” are displayed. Press SET to scroll to P1.1 to set the CO2 upper limit. The current CO2 set value will be blinking. Use the arrow ▲▼ buttons to adjust the value. Each button-press adjusts by 100 ppm (100~9900ppm).
P4.0 AUTOMATIC BASELINE CALIBRATION (ABC) ON/OFF ABC (Automatic Baseline Calibration) is used to implement a baseline CO2 calibration to eliminate the zero drift of the sensor. See the next section (Calibration) for instructions on performing the calibration. The ABC function defaults to the ON state. To disable this feature: press ▲/DP WB while in P3.0 mode (or MXN/AVG/▼ when in P1.0 mode) to access the P4.0 settings. Press SET to enter P4.1. The screen will flash “en” in the lower display.
MANUAL CO2 CALIBRATION Recommendation: The manual calibration should be performed by a qualified laboratory every 12 months. 1. Place the meter in the 400ppm calibration chamber. Turn the meter on and hold down the CAL/ESC and ▲/DP WB buttons simultaneously to enter CO2 calibration mode. 400ppm and “CAL” will blink on the LCD. 2. Wait approximately 5 minutes until the blinking stops. The calibration is then complete and the meter will automatically return to the normal mode. 3.
75% calibration 1. After the 33% calibration, plug the sensor into the 75% salt bottle. 2. Press SET to enter the 75% calibration. 3. “CAL” and the calibration value (75.2%, if at 25°C) will blink on the LCD with the current temperature shown on the left side of the display. 4. The meter is now calibrating and will finish in approximately 60 minutes (blinking stops). The meter will automatically return to the normal mode. NOTE: Single point calibrations can also be performed.
Specifications Function CO2 Range Resolution 0~2000ppm 1ppm 2001~9999ppm 1ppm Accuracy ±(5%rdg + 50ppm) Not specified Pressure dependent: ±1.6% reading per kPa deviation from normal pressure (100kPa) Temperature -10~60°C 14~140°F 0.1° ±0.6°C (0.9°F) Humidity 0.0~99.9% 0.1% ±3% (10 to 90%) ±5% (< 10 or > 90%) Wet Bulb Dew Point -5 to 60°C 23 to 140°F -20 to 60°C -4 to 140°F 0.1° 0.
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 (see specifications section above). TROUBLESHOOTING No Power Check that the AC adaptor is properly connected. Slow response Ensure that air flow channels on the back of meter are not blocked.
CO2 Levels and Guidelines Reference levels (for general purpose only) 250~350 ppm: Background (normal) outdoor air level 350~1,000 ppm: Typical level for 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.
