REED INSTRUMENTS R9905 (01) PDF Document

When using your REED INSTRUMENTS R9905, please adhere to the following safety guidelines:

• Never attempt to repair or modify your instrument. Dismantling your product, other than for the purpose of replacing batteries, may cause damage that will not be covered under the manufacturer’s warranty. Servicing should only be provided by an authorized service center.

• Avoid condensation on the CO2 sensor.

• Do not hold the meter in close proximity to your mouth as exhalation affects CO2 levels.

• Do not calibrate the meter in the air with unknown CO2 concentration.

The REED INSTRUMENTS R9905 has the following features:

• Triple LCD display simultaneously monitors carbon dioxide (CO2), temperature, and relative humidity.

• Calculates time-weighted average (TWA) and short-term exposure limit (STEL).

• Low-drift NDIR CO2 sensor for stable and accurate readings.

• Temperature and relative humidity measurements help determine thermal comfort.

• Easy-to-read backlit LCD display.

• User adjustable audible alarm.

• Data hold, Max/Min, and Average functions.

• Record up to 32,000 datapoints and keep track with an internal time and date stamp.

• User selectable sampling rate from 1 to 60 minutes.

• Low battery indicator and auto shut-off.

The following items are included with your REED INSTRUMENTS R9905:

• USB Cable

• Hard Carrying Case

• Batteries

The REED INSTRUMENTS R9905 is comprised of the following parts:

1. Temp/Humidity Probe

2. CO2 Sensor

3. LCD Display

4. Power and Backlight Button

5. MIN MAX AVG Button

6. SETUP Button

7. DATA HOLD Button

8. REC Button

9. °C/°F Button

10. CO2 Calibration Inlet

11. USB Interface

12. Tilt Stand

13. Battery Compartment

The display indicators on the REED INSTRUMENTS R9905 represent the following:

1. Setup Indicator: Appears when in setup mode.

2. Time Weighted Average Indicator: Indicates TWA reading is displayed.

3. CO2 Alarm Indicator: Flashes when a CO2 alarm is triggered.

4. Short-term Exposure Limit Indicator: Indicates STEL reading is displayed.

5. Hi CO2 Alarm Indicator: Indicates the high CO2 alarm is triggered.

6. Lo CO2 Alarm Indicator: Indicates the low CO2 alarm is triggered.

7. Recording Data Logger Indicator: Appears during a data logging session.

8. Data Hold Indicator: Appears when the Data Hold function is active.

9. CO2 Measurement Indicator: Identifies the CO2 reading section.

10. CO2 Reading: Main display for CO2 concentration.

11. Relative Humidity/Temperature Reading: Displays RH and temperature values.

12. Memory Full Indicator: Blinks when the internal memory is full.

13. Altitude Measurement Unit: Shows the unit for altitude (m).

14. CO2 Measurement Unit: Shows the unit for CO2 (ppm).

15. Relative Humidity Measurement Unit: Shows the unit for RH (%).

16. Temperature Measurement Unit: Shows the unit for temperature (°C/°F).

17. Auto Power Off Enabled Indicator: Shows that auto power off is active.

18. Battery Status Indicator: Shows the current battery level.

19. Minimum Indicator: Appears when the minimum reading is displayed.

20. Maximum Indicator: Appears when the maximum reading is displayed.

21. Average Indicator: Appears when the average reading is displayed.

22. Calibration Mode: Appears when the meter is in calibration mode.

To turn the REED INSTRUMENTS R9905 meter on, press the power button. To turn the meter off, press and hold the power button for 3 seconds.

The REED INSTRUMENTS R9905 starts taking measurements automatically when powered on and updates readings every 2 seconds. Ensure the CO2 sensor switch is in the “MEAS” position, not the “CAL” position.

Note: Rapid environmental changes (e.g., moving from indoors to outdoors) can cause inaccurate readings. It is recommended to allow your meter to acclimate to its new environment for approximately 10 to 15 minutes. Do not hold the meter close to your mouth or any other direct source of CO2.

When the REED INSTRUMENTS R9905 is powered on, press the °C/°F button to toggle between Celsius and Fahrenheit. The default unit is Celsius (°C), and the meter will automatically save the last selected unit of measure when turned off.

To use the Data Hold function on your REED INSTRUMENTS R9905, press the HOLD button to freeze the current reading on the display. Press the HOLD button again to resume normal operation. When the Data Hold function is enabled, the MIN MAX AVG, °C/°F, and SET buttons are disabled.

The REED INSTRUMENTS R9905 can monitor and store minimum, maximum, and average values. Follow these steps to view them:

1. Press the MIN MAX AVG button once. The MIN indicator will appear, and the minimum CO2, humidity, and temperature values will be displayed. These values will automatically update if new minimums are measured.

2. Press the MIN MAX AVG button again. The MAX indicator will appear, and the maximum values will be displayed and updated as new maximums are measured.

3. Press the button a third time. The short-term exposure limit (STEL) indicator will appear, displaying the average for the past 15 minutes, which updates every minute.

4. Press the button a fourth time. The time weight average (TWA) indicator will appear, displaying the limit for the past 8 hours, which updates every 10 minutes.

Note: If the meter has been on for less than 15 minutes, STEL and TWA values will only reflect the average of readings taken since power-on. If there is not enough data, “—-” will appear on the display.

5. Press the button a fifth time. The “MAX, MIN, STEL, and TWA” indicators will blink simultaneously. In this function, the meter displays only the current measurement values while continuing to update the stored readings in memory.

6. To exit this mode and resume normal operation, press and hold the MIN MAX AVG button for 2 seconds.

To operate the backlight on your REED INSTRUMENTS R9905, press the power/backlight button. The backlight will turn on or off. To preserve battery life, the backlight will automatically turn off after 30 seconds.

To access and navigate the Setup Mode on your REED INSTRUMENTS R9905:

1. Press the SET button to enter Setup mode.

2. Press the HOLD button continuously to scroll through the available parameters.

You can press the SET button at any time to exit setup mode and resume normal operation.

The following parameters can be adjusted in Setup Mode:

To set the data logging sampling rate on your REED INSTRUMENTS R9905, follow these steps in Setup Mode when “Int” is displayed:

1. The sampling rate can be set from 1 second (00:01) up to 60 minutes and 59 seconds (60:59).

2. Press the ▲ and ▼ buttons to adjust the required sampling rate by minutes or seconds.

3. Press the HOLD button to confirm each selection (minutes, seconds).

4. After confirming, press the HOLD button again to skip to the next parameter.

To set the offsets for Relative Humidity and Temperature on your REED INSTRUMENTS R9905, follow these steps in Setup Mode when “OFS” with %RH and °C/°F is displayed:

1. Press the ▲ and ▼ buttons to increase or decrease the required Humidity Offset.

2. Press the HOLD button to confirm the selection.

3. Press the ▲ and ▼ buttons to increase or decrease the required Temperature Offset.

4. Press the HOLD button to confirm the selection.

5. Press the HOLD button again to skip to the next parameter.

To set the CO2 offset on your REED INSTRUMENTS R9905, follow these steps in Setup Mode when “OFS” with ppm is displayed:

1. Press the ▲ and ▼ buttons to increase or decrease the required CO2 Offset.

2. Press the HOLD button to confirm the selection and skip to the next parameter.

To ensure accurate measurements, set the altitude compensation on your REED INSTRUMENTS R9905. Follow these steps in Setup Mode when “ALT” is displayed:

Altitude compensation can be set from 0 to 3000m. By default, it is set to 0000m. It is strongly recommended to set the correct altitude compensation.

1. Press the ▲ and ▼ buttons to increase or decrease the 1st digit.

2. Press the HOLD button to confirm selection and skip to the 2nd digit.

3. Press the ▲ and ▼ buttons to increase or decrease the 2nd digit.

4. Press the HOLD button to confirm selection and skip to the 3rd digit.

5. Press the ▲ and ▼ buttons to increase or decrease the 3rd digit.

6. Press the HOLD button to confirm selection and skip to the 4th digit.

7. Press the ▲ and ▼ buttons to increase or decrease the 4th digit.

8. Press the HOLD button to confirm selection and skip to the next parameter.

To set the CO2 alarm values on your REED INSTRUMENTS R9905, follow these steps in Setup Mode when “ALARM” is displayed:

1. Press the ▲ and ▼ buttons to turn the CO2 alarm ON or OFF.

2. Press the HOLD button to confirm and proceed to set alarm values if enabled.

Set High Alarm Value:

3. Press ▲/▼ to set the 1st digit, then press HOLD to confirm.

4. Repeat for the 2nd, 3rd, 4th, and 5th digits of the high alarm value, pressing HOLD after each.

Set Low Alarm Value:

5. After setting the high alarm, press ▲/▼ to set the 1st digit of the low alarm value, then press HOLD.

6. Repeat for the 2nd, 3rd, 4th, and 5th digits of the low alarm value, pressing HOLD after each.

When an alarm is triggered, the meter will beep, and the applicable ALARM indicator (Hi or Lo) will flash on the LCD.

To configure the auto-power off feature on your REED INSTRUMENTS R9905, follow these steps in Setup Mode when the clock icon appears:

1. The auto-power off time can be set to 10 minutes, 30 minutes, 1, 2, 4, 8 hours, or turned off completely.

2. Press the ▲ and ▼ buttons to adjust and select the required auto-power off time.

3. Press the HOLD button to confirm your selection and skip to the next parameter.

To set the current time and date on your REED INSTRUMENTS R9905, enter Setup Mode and navigate to the time/date screen. Follow these steps:

1. Press ▲/▼ buttons to set the last 2 digits of the year. Press HOLD to confirm.

2. Press ▲/▼ buttons to set the first 2 digits of the year. Press HOLD to confirm.

3. Press ▲/▼ buttons to set the month. Press HOLD to confirm.

4. Press ▲/▼ buttons to set the date. Press HOLD to confirm.

5. Press ▲/▼ buttons to set the hour. Press HOLD to confirm.

6. Press ▲/▼ buttons to set the minutes. Press HOLD to confirm and move to the next parameter.

Note: The internal clock will keep time when the meter is off. If new batteries are installed, the clock will need to be reset.

To record measurements with your REED INSTRUMENTS R9905, follow these steps:

1. Turn the meter on and select your desired sampling rate in the Setup Mode.

2. To begin a data logging session, press the REC button. “REC” will appear on the LCD.

3. Press the REC button again to stop data logging.

Note: When the internal memory is full (32,000 data points), the FULL indicator will blink on the LCD, and the recording session will stop automatically.

To transfer data from your REED INSTRUMENTS R9905, connect the meter to a port on your PC using the included USB cable. To download the recorded data, use the R9905 software. For instructions on how to use the software, please refer to the HELP section within the software program.

To delete the internal memory of your REED INSTRUMENTS R9905, follow these steps:

1. Press and hold the REC button while powering on the meter.

2. The display will show a 5-second countdown along with the “REC”, “CLR”, and “SURE” indicators.

3. Once the countdown is completed, “CLR” will be displayed, confirming that the memory has been erased.

4. Release the buttons when the meter emits a beep.

Note: To cancel the clearing of stored data, release both buttons before the countdown ends.

The REED INSTRUMENTS R9905 can be field calibrated with a span gas (cylinder with a specific concentration of CO2) with a concentration from 0 to 2000ppm, 2% accuracy, with balanced air. It is recommended to use a span gas value close to the gas concentration you expect to measure.

1. Switch the CO2 sensor to the “CAL” position.

2. Remove the protective cap.

3. Connect the silicone tubing to the calibration inlet of the sensor.

4. While the meter is off, press the SET, MIN MAX AVG, and power buttons simultaneously for 3 seconds and release when the LCD displays “—“.

5. Press the SET -> °C/°F -> °C/°F buttons in sequence and within 3 seconds to enter CO2 calibration mode.

6. The CAL indicator will appear on the LCD, confirming the meter is in CAL mode.

7. The upper part of the LCD will show the current CO2 measurement, and the lower part will show the CO2 calibration gas concentration.

8. Press the ▲▼ buttons to adjust the CO2 value to match the concentration of your span gas.

9. Turn on the calibration gas valve.

10. The current CO2 reading on the meter should begin to update.

11. When the CO2 reading has stabilized (approx. 2 minutes), press the HOLD button.

12. The LCD will display “PASS” if there are no errors.

13. Shut off the calibration gas valve once calibration is successfully completed.

14. Press the SET button to exit calibration mode and resume normal operation.

Note: If the meter displays OL, ensure the altitude compensation value is set correctly.

To calibrate the humidity sensor on your REED INSTRUMENTS R9905, you will need humidity calibration standards (e.g., REED R9975 for 75% RH and REED R9933 for 33% RH).

Enter Calibration Mode:

1. While the meter is off, press the SET, MIN MAX AVG, and power buttons simultaneously for 3 seconds and release when “—” appears.

2. Press the SET -> REC -> REC buttons in sequence within 3 seconds to enter humidity calibration.

3. Press the SET button to select the desired channel (Hi RH, Lo RH, Hi Temp, or Lo Temp).

Calibrating Hi RH (e.g., 75%):

1. Select Hi RH. The upper LCD will show “Hi”, and the lower LCD will show the “Hi” RH calibration data point.

2. Insert the tip of the meter into the 75% Humidity Calibration Standard.

3. If using a different standard, press the ▲▼ buttons to match the humidity value to your standard.

4. After 2 to 3 minutes, press the HOLD button to save the calibration. The meter will automatically skip to the “Lo” RH Calibration mode.

Calibrating Lo RH (e.g., 33%):

1. The upper LCD will show “Lo”, and the lower LCD will show the “Lo” RH calibration data point.

2. Insert the tip of the meter into the 33% Humidity Calibration Standard.

3. If using a different standard, press ▲▼ buttons to match the humidity value.

4. After 2 to 3 minutes, press the HOLD button to save the calibration and skip to the “Hi” Temp Calibration mode.

5. Once Hi/Lo RH calibration is done, press the power button to exit calibration mode.

Important Note: Temperature calibration should only be performed by an authorized service center technician using a temperature chamber, as incorrect calibration may affect the meter’s overall accuracy and reliability.

If proceeding under authorized conditions:

Enter Calibration Mode:

1. Access the Humidity/Temperature calibration mode as previously described.

2. Use the SET button to navigate to “Hi Temp” or “Lo Temp” calibration.

Calibrating Hi Temp:

1. The upper LCD will display “Hi”, and the lower part will show the “Hi” Temp calibration data point.

2. Insert the meter into the standard temperature chamber.

3. Press the ▲▼ buttons to adjust the temperature value to match the chamber’s standard.

4. After approximately 30 minutes, press the HOLD button to save the calibration and skip to the “Lo” Temp Calibration mode.

Calibrating Lo Temp:

1. The upper LCD will display “Lo”, and the lower part will show the “Lo” Temp calibration data point.

2. Insert the meter into the standard temperature chamber.

3. Press the ▲▼ buttons to adjust the temperature value to match the standard.

4. After approximately 30 minutes, press the HOLD button to save the calibration.

5. Press the power button to exit calibration mode and resume normal operation.

When the low battery indicator appears on the display of your REED INSTRUMENTS R9905, the battery should be replaced. Remove the battery cover on the back of the instrument and insert a new 9V battery.

The REED INSTRUMENTS R9905 is designed for environmental monitoring in various locations, including:

• Schools

• Office buildings

• Greenhouses

• Factories

• Hotels

• Hospitals

• Areas where high levels of carbon dioxide are generated

The following accessories and replacement parts are available for the REED INSTRUMENTS R9905:

• R9905-PROBE: Replacement Temperature and Humidity Probe

• R9933: Humidity Calibration Standard, 33%

• R9975: Humidity Calibration Standard, 75%

• R9980: Humidity Calibration Kit (33% and 75%)

• R8890: Large Hard Carrying Case

NIOSH provides the following recommendations for CO2 concentrations:

• 250 to 350ppm: Normal outdoor ambient concentrations.

• 600ppm: Minimal air quality complaints.

• 600 to 1000ppm: Less clearly interpreted.

• 1000ppm: Indicates 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.

Various organizations provide the following guidelines for CO2 levels:

• ASHRAE Standard 62 to 1989: 1000ppm – CO2 concentration in an occupied building should not exceed 1000ppm.

• Building Bulletin 101 (BB101): 1500ppm – UK standards for schools state that CO2 averaged over the whole day (i.e., 9am to 3:30pm) should not exceed 1500ppm.

• OSHA: 5000ppm – Time weighted average over five 8-hour work days should not exceed 5000ppm.

• Germany, Japan, Australia: 5000ppm – 8 hours weighted average in occupational exposure limit is 5000ppm.

To maintain your REED INSTRUMENTS R9905, please follow these product care recommendations:

• Store your product in a clean, dry place.

• Change the battery as needed.

• If your instrument isn’t being used for a period of one month or longer, please remove the battery.

• Clean your product and accessories with a biodegradable cleaner. Do not spray the cleaner directly on the instrument. Use on external parts only.