Typical representation of REED R9900 Indoor Air Quality Meter Product picture of R9900 REED Indoor Air Quality Meter for illustration purposes only. Actual product may vary.
REED R9900

Indoor Air Quality Meter

Sale price: $499.00
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Reed R9900 is the perfect home-inspector's CO2 Level Detector which simultaneously monitors carbon dioxide (0 to 5,000 ppm), relative humidity (0 to 99.9% RH) and temperature (-10 to 60°C) in residential or commercial applications. Its hold function freezes displayed reading giving you a precise indication even of dew point and wet bulb temperatures.

Accredited calibration/NIST traceable calibration certificate for REED R9900 Indoor Air Quality Meter might be available on request (for an extra charge). Please contact us for more info.

REED Indoor Air Quality Meter: instrument description

The R9900 is a Reed precision Indoor Air Quality Meter used to measure carbon dioxide in the same time with relative humidity and temperature. The Reed R9900 CO2 Level Detector can do Dew point and wet bulb temperature measurements and displays both STEL and TWA readings. Thanks to its very good response time and its low drift, non-dispersive infrared CO2 sensor, Reed R9900 assures excellent performance and accuracy in various applications including indoor air quality monitoring and surveillance.

REED R9900 (was 77535) Features

  • Simultaneously monitors carbon dioxide (CO2), relative humidity and
  • Instantaneous readings are displayed on a high resolution LCD with backlight
  • Dew point and wet bulb temperatures can also be displayed
  • Displays STEL readings (Short-Term Exposure Limit) over a 15-minute
    period and TWA readings (Time-Weighted Average) over a period of 8 hours
  • Hold function freezes displayed reading
  • Maximum, minimum and average functions
  • Low drift, non-dispersive infrared CO2 sensor
  • Audible warning

REED R9900 (was 77535) Specifications

  • CO2: 0 to 5,000 ppm;
  • Temperature: -10 to 60°C (14 to 140°F);
  • Humidity: 0 to 99.9% RH;
  • Dew Point: -73.4 to 60°C;
  • Wet Bulb: -13.3 to 60°C

  • Resolution:
  • CO2: 1 ppm;
  • Temperature: 0.1°C/°F;
  • Humidity: 0.1% RH

  • Accuracy:
  • CO2: ±5% rdg. ±50 ppm;
  • Temperature: ±0.6°C (±0.9°F);
  • Humidity: ±3% RH @ 25°C (10 to 90% RH)
    ±5% RH <10% & >90%
  • CO2: Non-Dispersive Infrared (NDIR);
  • Humidity: Rotronic capacitor
  • Response Time: 30 seconds
  • Audible Alarm: 80dB

How to use CO2 Level Detector R9900

Warm-Up the instrument
When powering on, this Indoor Air Quality Meter will beep and starts to warm-up for 30 seconds. After this time the instrument will enter into the normal-measuring mode and will show the current CO2, temperature, and humidity readings on its LCD display. The meter will update the values for every second.

Using the Data Hold function
Sometimes, during the measurements you need to hold on the readings of CO2. Using the Data Hold function this Reed Indoor Air Quality Meter will keep on the display the CO2 values. Activate this by pressing the “HOLD” button. The “HOLD” symbol on the LCD will indicate the function is activated.

Max, Min, & Weighted Averages
When the instrument turns into MIN and MAX modes, the LCD will show the minimum and maximum readings of CO2 on the main display and of the readings on the lower displays. To show the weighted average of CO2 readings for the past 15 minutes use the STEL mode. Thanks to its Averages function the Reed R9900 CO2 Level Detector are also able to show the average of CO2 reading for the past 8 hours (TWA mode). The lower displays will continue to measure normally. Note that the instrument needs at leas 5 minutes to calculate STEL and TWA.

C02 concentrations alarm function
This meter features an audible alarm when CO2 concentrations exceed a set limit. To set-up the alarm, press and hold the “SET” button for two seconds. “AL” and P1.0 will appear on the LCD. Press the “ENTER” button to modify the alarm setting.

Temperature Unit
To change the temperature scale from °C to °F, press and hold the “SET” button for 2 seconds. Press the “DOWN” button and “Unit” and P3.0 will appear on the LCD. Press the “ENTER” button, and modify the temperature unit by pressing the “UP” or “DOWN” buttons. Press the “ENTER” button to save the setting, or press the “ESC” button to cancel.

Depends on your needs, you can have the LCD of the insrument backlighted. Hold down the “BACKLIGHT” button for a second to activate and to cancel the backlight function.

Ordering info

As a canadian distributor of REED Instruments products we stock most of these Gas Detectors for same day shipping. To enquire on the REED R9900 Indoor Air Quality Meter availability and current list price please contact us.


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