A compact package to record air quality for weeks on end.
 
The Model L76v Indoor Air Quality Measurer is a compact, portable instrument designed to acquire a time series of measurements of carbon monoxide (CO), carbon dioxide (CO2), temperature (T) and relative humidity (RH). Over 21,000 samples are retained for a specified measurement period. The trime between samples can be any number of seconds.  (Minute-by-minute data will extend over two weeks)
    All sensors and electronics are mounted within the non-conductive case; two screened air vents are drilled in the case to allow for the free flow of air.
Model L76n Indoor Air Quality Measurer
Specifications
 
Range:
    CO Sensor: 0 to 200 ppm
    CO2 Sensor: 0 to 4000 ppm
    Temperature: -40 to 185 °C (-40 to 85 °C)
    Relative Humidity: 5-95% RH
Resolution:
    0.05 ppm (50 ppb) CO
    0.005 ppm (5 ppb) CO is optional
    1 ppm CO2
    0.18 °F, 0.1 °C
    0.5% RH
Size:
    4 by 6 by 8 in (10 by 15 by 20 cm)
Weight:
    2.2 pounds (1 kilogram), includes batteries.
Interfaces:
    Data are transferred using a USB connecting cable.
Electrical:
    1-year lithium coin battery (logger usage)
    Separate 6 VDC supports CO cell/electronics
    Separate 6VDC for CO2 and digital display
Software Settings:
    Hoboware Windows or Macintosh Software,
        includes graphic displays
Sampling Frequency:
    One seconds or longer; stop-when-full,
Sampling Start:
    Upon launch; at delayed time, or by push button (anytime.)
Storage Capacity:
    21,500 samples (when saving both CO +CO2) on
    one logger and RH & T on a second.
    43,000 total samples each logger.
Collection Capacity:
    From days to years
    Stores user-created texts;
        calculates GMT time zone and date.
    Save as compact files, ASCII text, or graphics.
Calibration:
    uses bottled span gas;
        flooding cap for applying CO is supplied;
        can be used to direct air stream to sensor.
    (calibration gases and flow-control valve available for sale for both CO & CO2)
The photograph of the opened case shows the incorporated Telaire Carbon Dioxide Model 7100, the dual lantern batteries (for extended measuring times) and the carbon monoxide digital display.  The CO, temperature and relative humidity sensors are mounted beneath.
© 1996-2006 Langan Products, Inc.  
CiTicel is a trademark of City Technology Ltd. Hoboware of Onset Computer Company. Telaire of General Electric Company.   January 2006.