Sampling Data Logger User’s Manual
PAGE
13
of
17
1%
or
30%
Sampling
Data
Logger
Calibration can be performed using either 100% CO2 calibration gas (typically nitrogen, argon, etc.), or using a
fresh source of air, assumed to be approximately 400ppm.
NOTE
: Refer to the GasLab
®
User’s Manual for complete instructions.
Calibration
Procedure
To calibrate your meter, follow these steps:
1. Turn ON the meter.
2. Expose the meter to ambient air (assumed to be at 400ppm) or supply calibration gas bottle/cylinder
(100% nitrogen or argon) with the appropriate demand regulator.
3. Wait 25 seconds to collect a sample. Write down this value as the “before” value.
4. Click the
CALIBRATE
button after selecting your calibration gas.
5. Wait 25 seconds again. This time, the meter will take a sample and use this data to adjust zero values. The
displayed measurement will show the new calibration value (0 or 400ppm, depending on method used).
6. Disconnect the Calibration gas and wait 25 seconds. All displayed data will now be based on the new
calibration value. Repeat this procedure if the sensor is still operating outside of its specified range or if
readings vary greatly.
5%,
60%,
and
100%
Sampling
Data
Logger
These models do not feature Automatic Background Calibration (ABC) algorithm due to the CO2 scale they
measure. To ensure the highest accuracy, we recommend calibrating these units with calibration gas (Nitrogen for
ZERO or CO2), close to the concentration being measured. Alternatively, a 100% or ambient calibration can be
performed.
To perform a calibration, attach the unit to your computer, power it with the wall adapter and either expose it to
atmosphere or supply it with your calibration gas, fed with a demand‐based regulator.
Open the GasLab
®
software on your personal computer and click the
CONFIGURE
SENSOR
button. Cick the
TURN
PUMP
ON
CONTINUOUSLY
button to ensure continuous flow. (To apply any changes, the meter has to be
restarted).
Zero
or
Fresh
Air
Calibration
Supply gas and select the appropriate concentration in the screen. Click the
CALIBRATE
button. The sensor reading
should instantly reflect the calibration.
High
‐
Concentration
Calibration
Write down the original Zero Value before adjustment for future reference. Apply the desired concentration
calibration gas; adjust the Zero Value in increments of 10 pressing the large
SAVE
button on the right until the unit
displays the correct concentration.
