Section 1
Unpacking & Inspection
1-3
signal. Analog output is linear, and the 0-50
°
C dew point range is scaled
over 0-5 volts (100mV/
°
C).
LI-670 Flow Control Unit
The LI-670 is a valuable accessory for use with the LI-6262, which can be
used for a variety of calibration and gas exchange measurement functions.
In its simplest form, the LI-670 is used as a constant source of air flow to the
LI-6262. Independent pumps and rotameters allow variable flow rates
through the LI-6262 sample and reference cells, if desired.
For calibration of the LI-6262, soda lime and desiccant tubes provide a zero
gas source; a span gas can be swapped between cells to adjust for any zero
offset present during calibration.
The LI-670 also can be used as a power source for the LI-6262; a built-in
low battery detection circuit monitors battery life of the system. Mounting
brackets are included for attaching the LI-670 and LI-6262, making the
system completely portable.
1.2 Checking the Batteries (If purchased)
Batteries are tested and fully charged when they leave the factory, but they
may discharge during shipping. It is a good idea to test each battery to see if
it is charged. If the batteries are below 12V, they should be charged before
use. Refer to Section 7.1 for charging instructions.
NOTE
:
Never
store batteries in a discharged state. Charge stored bat-
teries every 3 months.
