General CDM77535 Bedienungsanleitung

CDM77535

USER’S MANUAL

Digital CO2

Environmental Meter

INTRODUCTION

Thank yo for p rchasing this portable CO2meter. The meter

meas res CO2level, air temperat re, dew point, wet b lb temperat re

and h midity and is an ideal instr ment for indoor air q ality (IAQ)

diagnosis.

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 1

Poor indoor air quality is considered unhealthy because it causes

tiredness, loss of ability to concentrate, and even illness (ex. Sick

Building Syndrome). AQ monitoring and survey, especially on CO2

level and air ventilation, has become widely applied in public areas

such as offices, classrooms, factories, hospitals and hotels. t is also

used in the regulations of industrial hygiene in some countries.

(Appendix)

The portable CO2meter uses ND R (non-dispersive infrared) technology

to ensure reliability and long term stability. t’s useful in verifying HVAC

system performance and air ventilation control.

FEATURES:

• Triple displays of CO2level, temperature and humidity

• Stable ND R sensor for CO2detection

• Statistics of weighted averages TWA (8 hours weighted average)

STEL (15 minutes weighted average)

• Backlight for working in dark area

• Audile CO2warning alarm

• Battery and optional adaptor power supply

• Easy manual calibration on CO2and humidity

• PC connect via RS232 interface

MATERIAL SUPPLIED

This package contains:

• CO2Meter

• 4 “AA” batteries

• Operation manual

• Hard carrying case

POWER SUPPLY

The meter is powered by either 4 “AA” batteries or a “DC” adaptor

(9V/1A output).

nstall the batteries into the battery compartment on the rear and

make sure they are in correct polarity and good contact. When an

adaptor is used, it will cut off the power supply from batteries. The

adaptor can't be used as a battery charger.

When battery voltage gets low, ( ) and “Lob” will appear on the

LCD (Fig. 1). And beeper sounds. The CO2sensor can’t work under low

voltage, so it beeps to indicate failed CO2measurement (press any

key but ( ) to stop the beeps) and the readings won’t be

displayed. Please replace with fresh batteries or connect with an

adaptor.

Optional accessories:

• 33% calibration salt

• 75% calibration salt

• Adaptor (9V/100-240Vac)

• ASFT Kit, cable and software

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 2

LCD DISPLAY

SYMBOLS

TWA . . . . . . . . . . Time weighted average (8 hours)

STEL . . . . . . . . . . Short-term exposure limit

(15 minutes weighted average)

HOLD . . . . . . . . . Readings are frozen unchanged

M N/MAX . . . . . . Minimum/Maximum readings

( CON) . . . . . . . . Low battery indicator

DP . . . . . . . . . . . Dew point temperature

A R . . . . . . . . . . . Air temperature

WBT . . . . . . . . . . Wet bulb temperature

% . . . . . . . . . . . Unit of relative humidity

°E (C/F). . . . . . . . Celsius/Fahrenheit

AVG/ftm/m/s . . . Vain icons in these models

KEYPAD

Turns on and off the meter.

Enters setup mode.

Sets as non-sleep mode with .

Exits setup page/mode.

Enters CO2calibration with .

Enters RH calibration with .

Freezes the current readings.

Cancels data hold function.

Activates or cancels the backlight.

Selects unit or increases value in setup.

Selects A R, DP, WBT temps display

Selects unit or decreases value in setup.

Activates M N, MAX, STEL, TWA function.

Saves and finishes settings.

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OPERATION

POWER ON/OFF

Press ( ) to turn the meter on and off. At power up, it emits a

short beep and performs 30 seconds count down (Fig. 2) for meter

warm up, then enters normal mode with current CO2, temperatures,

and humidity readings displayed (Fig. 3).

TAKING MEASUREMENT

The meter starts measurement when powered on and updates

readings every second. n the condition of operating environment

change (ex. from high to low temperature), it takes 30 sec to respond

for CO2sensor and 30 minutes for RH.

NOTE: Do not hold the meter close to anyyone’s face in case

exhalation affects CO2levels.

AIR, DP, WBT

Press ( ) to switch temperatures display. The lower left display

will cycle from air temperature, dew point temperature (Fig.4) and wet

bulb temperature (Fig. 5).

DATA HOLD

Press ( ) to freeze the readings, “HOLD” icon is displayed on the

left top of LCD (Fig.6). All current readings are kept unchanged, except

STEL and TWA. Press ( ) again to cancel the hold function.

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 4

BACK IGHT

Hold down ( ) for more than 1 second to activate and cancel

backlight function.

M N, MAX, STEL, TWA

Under normal mode, press ( ) to see the minimum, maximum,

and weighted average readings. Each press of ( ) displays M N,

MAX, STEL, and TWA in sequence and returns to normal mode.

n M N and MAX modes, it shows the minimum and maximum

readings of CO2on main display and of A R or DP or WB temperatures

and humidity on the lower displays. (Fig. 7)

n STEL and TWA modes, the main display shows the weighted

average of CO2readings for the past 15 minutes (STEL) and 8 hours

(TWA). The lower displays are the current A R, DP/WB temperatures

and humidity. (Fig. 8)

NOTE:

1. f the meter is turned on for shorter than 15 minutes, the STEL

value will be the weighted average of readings taken since

power on. Same for TWA values appear before 8 hours.

2. t takes at least 5 minutes to calculate STEL and TWA. The

display shows “___” (Fig. 9) during the first 5 minutes from

power on.

3. While all readings are held unchanged, STEL and TWA will keep

updating every 5 minutes.

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 5

A ARM

The meter features an audible alarm to give warnings when CO2

concentration exceeds the limit. (See P1.o in setup for setting alarm

threshold). t emits beeps (Abt.80dB) when CO2level goes over the set

value and stops when any key (except ) was pressed or

readings fall below the set value. t beeps again when value goes over

the limit. Restart the meter if beeper can't be stopped.

AUTO POWER OFF

The meter turns off automatically after 20 minutes of inactivity. To

override the function, hold down ( ) and ( ) for 2 seconds

to turn on the meter until “n” appears.

NOTE: Auto sleep function will be disabled during calibration mode.

SETUP

Hold down ( ) under normal mode for more than 1 sec to enter

setup mode. To exit setup, press ( ) in P1.o or P3.o and it returns

to normal mode.

PROGRAMMING P1.o CO2A ARM

When entering setup mode, P1.o and “AL” (Fig.10) are displayed on the

LCD. Press ( ) to go into P1.1 for setting CO2alarm threshold.

The current set value will be blinking on LCD (Fig11).

Press ( ) to increase the value or ( ) to decrease. Each

press tunes 100 ppm and the alarm range is from 100 to 9900ppm.

When the preferred alarm value is set, press ( ) to save the

setting or ( ) without saving and return to P1.o.

NOTE: P2.o is not applicable in this model.

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 6

PROGRAMMING P3.o TEMPERATURE SCA E

Press ( ) or ( ) in P1.o to access P3.o for setting up

temperature scale (Fig. 12). Press ( ) and it goes into P3.1 with

blinking °C or °F current set (Fig.13) on the lower left display. To

switch °C or °F,

Press ( ) and ( ). Then press ( ) to save the setting or

( ) without saving and return to P3.o.

CO2CALIBRATION

The meter defaults to be calibrated manually in the ambient air where

CO2concentration is around 400ppm. t’s suggested to do manual

calibration regularly to maintain good accuracy.

CAUTION:

Do not calibrate the meter in air with unknown CO2

concentration. Otherwise, it will be calibrated as 400ppm

by default and will lead to inaccurate measurements.

CA IBRATION SITE

The manual calibration is suggested to be done in fresh outdoor air

that is well ventilated and in sunny weather.

PROCEDURE

Place the meter in the calibration site. Turn on the meter and hold

down ( ) and ( ) simultaneously to enter CO2calibration

mode (Fig.14). 400ppm and “CAL” are blinking on the LCD while

performing calibration.

Wait about 10 minutes until the blinking stops and the calibration is

completed automatically and returns back to normal mode.

To abort the calibration, turn off the meter at any time.

NOTE: Ensure the batteries are with full voltage during the calibration

cycle to prevent interruption or failed calibration.

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 7

RH CA IBRATION

The meter defaults to have the humidity calibrated with 33% and 75%

salt solution. The ambient condition is recommended to be at 77°F

(25°C) and stable humidity (better to be close to the calibrating value).

To abort calibration, just turn off the meter.

CAUTION:

Do not calibrate the humidity without the default

calibration salt. Otherwise, it will cause permanent

damage. Contact the dealer for calibration salts.

33% CA IBRATION

Plug the sensor probe into 33% salt bottle. Hold down ( ) and

( ) under normal mode to enter 33% calibration (Fig. 15). “CAL”

and calibrating value (32.7% if at 77°F (25°C)) are blinking on the LCD

with current temperature at the left.

Meter is now calibrating, and will finish in about 60 minutes when

“CAL” and humidity stop blinking (Fig. 16).

75% CA IBRATION

After 33% calibration, plug the sensor probe into 75% salt bottle, then

press ( ) to enter 75% calibration (Fig.17).

“CAL” and calibrating value (75.2% if at 77°F (25ºC) are blinking on

the LCD with current temperature at the left. Meter is now calibrating.

Wait about 60 minutes until the blinking stops, then calibration is

completed and it returns to normal mode.

NOTE: Users can also calibrate either point. To calibrate 33% only,

press ( ) and exit when 33% calibration is completed.

To calibrate 75% only, press ( ) or ( ) within the

5 minutes while initializing 33% calibration.

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 8

TROUBLESHOOTING

? CAN’T POWER ON

Press ( ) for more than 0.3 seconds and try again. Check

whether batteries are in good contact with correct polarity, or the

adapter is plugged in properly.

? FIXED READINGS

Check whether data hold function was activated. (HOLD icon at the

top left)

? S OW RESPONSE

Check whether the airflow channels on the rear are blocked.

? ERROR MESSAGES

E01: CO2sensor 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 a voltage to measure CO2. Replace batteries or use

the adapter

E11: Retry humidity calibration

E17: Retry CO2calibration

E31: Temperature sensor damaged

E34: Humidity sensor damaged

PC CONNECTION

The meter can do PC link for on-line logging and data analysis via

RS232 interface and software.

The protocol is as follows:

A. 9600 bps, 8 data bits, no parity.

B. Format (ASC )

Cxxxxppm:Txxx.xC(F):Hxx.x%: dxxx.xC(F):wxxx.xC(F) LRC CRLF

Description: $CO2:Air:RH:DP:WBT LRC CRLF

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 9

SPECIFICATION

CO2

Range: 0-5,000ppm

5,001-9,999 (out of scale)

Resolution: 1ppm

Accuracy: ±50ppm ±5%rdg (0-5,000ppm)

Not specified for out-of-scale

Pressure

Dependence: +1.6% reading per kPa deviation from

normal pressure, 100kPa

TEMPERATURE

Range: 14º-140°F (-10.0º to 60.0°C)

Resolution: 0.1°F (0.1°C)

Accuracy: ±0.9°F (0.6°C)

HUMIDITY

Range: 0.0 to 99.9%

Resolution: 0.1%

Accuracy: ±3% (10 to 90%) ±5% (others)

Warm up: 30 seconds

Operating: 32° to 122°F (0º to 50°C), 0 to 95%RH

(avoid condensation)

Storage: -4° to 140°F (-20º to 60°C), 0 to 99%RH

(avoid condensation)

Power Source: 4 “AA” batteries, DC adaptor

Battery life: 24 hours (Alkaline)

CO2LEVELS AND GUIDELINES

NON-ENFORCED REFERENCE EVE S

NIOSH recommendations

250-350ppm: Normal outdoor ambient concentrations

600ppm: Minimal air quality complaints

600-1000ppm: Less clearly interpreted

1000ppm: ndicates inadequate ventilation; complaints

such as headaches, fatigue, and eye/throat

irritation will be more widespread. 1000ppm

should be used as an upper limit for indoor

levels.

EPA Taiwan: 600ppm and 1000ppm

CDM775355-fina -092508:Layout 1 9/25/08 10:11 AM Page 10

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