Extech Instruments CO230 Manual de usuario

User Guide

Wall-Mount CO2Monitor

Model CO230

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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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

CO2in natural ambient air is approximately 0.04% or 400ppm.

The NDIR (non-dispersive infrared) sensor provides stable, long term

monitoring.

This meter is shipped fully tested and calibrated and, with proper use,

will provide years of reliable service.

FEATURES

LCD simultaneously displays CO2Level, Relative Humidity, and

Temperature (air, dew point, or wet bulb)

Stable NDIR sensor for CO2 detection

Weighted averaging: TWA (8 hours) & STEL (15 minutes)

Automatic Baseline Calibration (ABC). Can be disabled for use in

areas with continuously elevated CO2levels (>400ppm)

Manual CO2calibration

Audio-visual CO2concentration warning alarm

Dew Point and Wet Bulb temperature calculations

Relay output for connecting external indicators or controllers

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Descriptions

Meter Description

1. Temperature/RH sensor

2. Main Display

3. Alarm Relay Output

4. Aux. Displays

5. 12V AC Adaptor jack

6. Keypad

7. Alarm alert lamp

8. CO2sensor

Note: Wall mount hole and relay

wiring screws are located on the back

Display Description

1. CO2concentration (ppm)

2. Relative Humidity (%)

3. Air Temperature, Dew Point or

Wet Bulb Temperature (°C / °F)

Display Icons

TWA Time weighted average (8 hours)

STEL Short-term exposure limit (15-min. weighted average)

HOLD Holds reading on display

MIN/MAX Minimum/Maximum readings

DP Dew point temperature

AIR Air temperature

WBT Wet bulb temperature

% Relative Humidity measurement unit

°E (C/F) Temperature units (Celsius/Fahrenheit)

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Keypad Description

SET Meter ON/OFF power

Setup mode

Save settings

CAL/ESC CO2calibration 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.

Power the unit by plugging the AC adaptor into the meter and into an

AC source. The meter will switch ON with a short beep.

The LCD will perform a 30 second countdown and then displays the

current CO2concentration, air temperature, and relative humidity.

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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

CO2sensor 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 CO2when measuring.

AIR, DP and WBT Temperature

Use the DP/WBT button to step through AIR(air temperature), DP

(dew point temperature) and WBT (wet bulb temperature) shown on

the lower left display.

MIN, MAX, STEL, TWA MODES

In the normal mode, use the Max/AVG button to see the minimum,

maximum, and weighted average readings. Use the Max/AVG button

to step through MIN, MAX, STEL, and TWA modes in sequence and

then back 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 CO2readings for the prior 15 minutes (STEL) or 8 hours

(TWA). The lower display shows the current AIR, DP/WB temperature

and humidity.

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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 CO2concentration exceeds

the high limit. The meter beeps (~80dB) and flashes the LED when

the CO2level exceeds the high limit. The beeper stops when any key

is pressed or if the reading falls below the low setpoint limit.

Press and hold SET to stop the beeper. The LED lamp will continue to

flash when the beeper is manually shut off if there is still an alarm

condition. The LED will stop flashing when readings return to normal.

ALARM RELAY OUTPUT

The meter includes an internal reed relay that can be connected to

an external device (not supplied). When the CO2readings exceed the

high limit, the relay closes. When the CO2readings fall below the low

limit, the relay will open. This relay can be used to switch in an

external device. The meter can be connected to a device to control

such things as alert signs/beepers or ventilation systems for

conditioning the air quality.

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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 CO2upper limit. The current

CO2set value will be blinking.

Use the arrow ▲▼ buttons to adjust the value. Each button-press

adjusts by 100 ppm (100~9900ppm). When the desired value is set,

press SET to enter P1.2 to set the lower limit (using the same

method as for the high limit). When finished, press SET to save or

CAL/ESC to exit without saving and return to P1.0.

P3.0 TEMPERATURE UNITS (C/F)

Use the ▲/DP WB button from the P1.0 display to access P3.0.

Press SET to enter P3.1 for setting the temperature units. The

currently selected unit (°C / °F) will be blinking in the lower display.

To switch units press▲/DP WB or MXN/AVG/▼. Press SET to save

the setting or press CAL/ESC to exit without saving and return to

P3.0.

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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. To disable the

ABC function press ▲/DP WB or MXN/AVG/▼until “dis” is

displayed on the LCD. Press SET to save the settings or CAL/ESC to

exit without saving and return to P4.0.

Calibration

CO2CALIBRATION

The meter is factory calibrated to a 400ppm CO2standard

concentration.

NOTE:The meter should be returned to Extech for calibration once

per year or whenever the accuracy of the meter is in question.

CAUTION: Do not calibrate the meter in an atmosphere of unknown

CO2concentration.

There are 2 options for calibration; Automatic Baseline Calibration

and Manual Calibration; see below

AUTOMATIC CO2BASELINE CALIBRATION (ABC)

Automatic Baseline Calibration (ABC) will calibrate the meter at the

minimum CO2reading detected during 7 days of continuous

monitoring. The ABC default is ON. To disable the ABC function,

please refer to the P4.0 Setup mode section above. Perform the

calibration in a well ventilated area with a CO2level near 400ppm.

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MANUAL CO2CALIBRATION

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. To abort the calibration at any time, press RESET.

RH CALIBRATION

The meter is calibrated to standard 33% and 75% salt solutions.

To abort calibration press and hold the RESET button for > 1 second.

CAUTION: Do not calibrate the humidity without standard calibration

salt bottles. Otherwise, the meter will have to be returned for

specialized calibration service. Contact Extech for calibration salts or

calibration service.

33% calibration

1. Plug the sensor into the 33% salt bottle.

2. Press and hold CAL/ESC and MXN/AVG/▼to

enter the 33% calibration. “CAL” and the

calibration value (32.7%, if at 25°C) will blink on

the LCD with the current temperature shown

on the left.

3. The meter is now calibrating and will finish in

approximately 60 minutes (when “CAL” and the humidity

reading are no longer blinking).

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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. To calibrate

33% only, press CAL/ESC and stop after the 33% calibration is

completed. To calibrate 75% only, press ▲/DP WB or MXN/AVG/▼

within 5 minutes of initializing the 33% calibration.

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