9
Operating Instructions
Power ON/OFF
Turn the meter on by pressing the
POWER
button. To turn the meter off,
press and hold the
POWER
button for 2 seconds.
Note:
This meter can be powered by either six (6) "AA" batteries or AC
adapter (sold separately).
Selecting Measurement Modes
The R9910SD has 6 measurement modes:
• Humidity/Temperature
• Dew Point Temperature
• Wet Bulb Temperature
• CO/Temperature
• O
2
/Temperature
• CO
2
/Temperature
Note:
Up to three probes can be plugged in at the same time: the
Humidity, CO
2
, and either the O
2
or the CO Probe. The meter will data log
all three values, however, only one value can be displayed at a time on the
LCD screen.
1. Connect the Humidity, CO
2
, and either the O
2
or CO Probe into
the meter.
2. When the meter is on, press the FUnCTIOn button to scroll through
the measuring modes. The display will flash "rH" (for Humidity/
Temperature measurement), "dP" (for Dew Point measurement),
"_Et" (for Wet Bulb measurement), "CO
2
" (for CO
2
/temperature
measurement), "CO" (for CO/temperature measurement) and "O
2
"
(for O
2
/temperature measurement).
3. Release the FUnCTIOn button to confirm selection.
continued...
REED Instruments
1-877-849-2127 | [email protected] | www.reedinstruments.com
