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General CDM77535 User Manual

Digital co2 environmental meter
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CDM775355-final-092508:Layout 1
9/25/08
10:11 AM
CDM77535
USER'S MANUAL
Digital CO
2
Environmental Meter
INTRODUCTION
Thank you for purchasing this portable CO
meter. The meter
2
measures CO
level, air temperature, dew point, wet bulb temperature
2
and humidity and is an ideal instrument for indoor air quality (IAQ)
diagnosis.

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Summary of Contents for General CDM77535

  • Page 1 CDM775355-final-092508:Layout 1 9/25/08 10:11 AM CDM77535 USER’S MANUAL Digital CO Environmental Meter INTRODUCTION Thank you for purchasing this portable CO meter. The meter measures CO level, air temperature, dew point, wet bulb temperature and humidity and is an ideal instrument for indoor air quality (IAQ)

  • Page 2: Material Supplied

    CDM775355-final-092508:Layout 1 9/25/08 10:11 AM Poor indoor air quality is considered unhealthy because it causes tiredness, loss of ability to concentrate, and even illness (ex. Sick Building Syndrome). IAQ monitoring and survey, especially on CO level and air ventilation, has become widely applied in public areas such as offices, classrooms, factories, hospitals and hotels.

  • Page 3: Lcd Display

    CDM775355-final-092508:Layout 1 9/25/08 10:11 AM LCD DISPLAY SYMBOLS TWA ..Time weighted average (8 hours) STEL ..Short-term exposure limit (15 minutes weighted average) HOLD .

  • Page 4: Operation

    CDM775355-final-092508:Layout 1 9/25/08 10:11 AM 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 CO , temperatures, and humidity readings displayed (Fig.
  • Page 5 CDM775355-final-092508:Layout 1 9/25/08 10:11 AM BACKLIGHT Hold down ( ) for more than 1 second to activate and cancel backlight function. MIN, MAX, STEL, TWA Under normal mode, press ( ) to see the minimum, maximum, and weighted average readings. Each press of ( ) displays MIN, MAX, STEL, and TWA in sequence and returns to normal mode.

  • Page 6: Auto Power Off

    CDM775355-final-092508:Layout 1 9/25/08 10:11 AM ALARM The meter features an audible alarm to give warnings when CO concentration exceeds the limit. (See P1.o in setup for setting alarm threshold). It emits beeps (Abt.80dB) when CO level goes over the set value and stops when any key (except ) was pressed or readings fall below the set value.
  • Page 7 CDM775355-final-092508:Layout 1 9/25/08 10:11 AM PROGRAMMING P3.o TEMPERATURE SCALE 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 (...
  • Page 8 CDM775355-final-092508:Layout 1 9/25/08 10:11 AM RH CALIBRATION 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.

  • Page 9: Troubleshooting

    CDM775355-final-092508:Layout 1 9/25/08 10:11 AM 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.

  • Page 10: Specification

    CDM775355-final-092508:Layout 1 9/25/08 10:11 AM SPECIFICATION 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)
  • Page 11 CDM775355-final-092508:Layout 1 9/25/08 10:11 AM Type 1 Indoor areas such as department stores, theaters, restaurants, libraries, the acceptable CO concentration of 8 hours average is 1,000ppm. Type 2 Indoor areas with special requirements of good air quality such as schools, hospitals, day care centers, the suggested CO level is 600ppm.
  • Page 12 PHONE (212) 431 - 6100 FAX (212) 431 - 6499 TOLL FREE (800) 697-8665 e-mail: sales@generaltools.com www.generaltools.com CDM77535 User’s Manual Specifications subject to change without notice ©2008 GENERAL TOOLS & INSTRUMENTS ™ NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS. MAN#CDM77535 10/08...

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