LI-COR LI-600, Instruction Manual

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LI-600 Porometer/Fluorometer Instruction Manual
8-16
Gently but firmly attach the calibration clamp. The
calibration clamp is equipped with a 10-32 hose barb
for tube connection.
7 Attach the dew point generator.
Connect a dew point generator to the calibration
clamp, ensuring that the tube connection does not
prevent the clamp from sealing properly.
8 Span the RH sensors.
Deliver an airstream across the RH sensors then click
Span in the computer software when they stabilize,
which can take approximately 30 minutes. Do not
allow maximum airflow to exceed 0.25 LPM. The
Flow or inlet flow sensor will read negative values
(i.e., approximately -30 to -100 µmol s
-1
) due to the
airflow toward both the air exhaust and air inlet.
Flow_s will read positive values (i.e., approximately
100 to 200 µmol s
-1
).
Flow sensors
The flow sensors’ response to no active flow can alter
over time and can be reset. Take the following steps to
reset the flow sensors. No disassembly is required.
1 Open Instrument Calibration.
Connect the LI-600 to a computer via USB then open
the computer software. Click the drop-down menu
on the Toolbar then select Instrument Calibration.
2 Power off the pump and blower.
Select Flow Zero then click Begin Flow Zero Cal-
ibration to view Flow In Zero and Flow Out Zero.
Click TURN PUMP OFF then click
TURN BLOWER OFF .
3 Zero the flow sensors.