3
Chapter 2
Setting-up
Supplying Power to the Alnor CF920/A
IRFLOW
IAQ920
The Alnor CF920/A
IRFLOW
IAQ920
can be powered in one of two ways:
four size AA batteries or the optional AC adapter.
Installing the Batteries
Insert four AA batteries as indicated by the diagram located on the
inside of the battery compartment. The Alnor CF920/A
IRFLOW
IAQ920
is designed to operate with either alkaline or NiMH rechargeable
batteries, although it will not recharge NiMH batteries. Battery life will
be shorter if NiMH batteries are used. Carbon-zinc batteries are not
recommended because of the danger of battery acid leakage.
Using the Optional AC Adapter
When using the AC adapter, the batteries (if installed) will be bypassed.
Be sure to provide the correct voltage and frequency, which is marked
on the back of the AC adapter. The AC adapter is not a battery charger.
Using The Probe
The sensing probe relies on the diffusion of air. For best results, try to
keep the sensing probe surrounded by moving air. Do not breathe on the
probe. Humans exhale CO
2
levels exceeding 10,000 ppm and it may
take time for the probe to re-stabilize. Use the probe holder to support
the probe when in continuous data logging mode.
Connecting to a Computer
Use the USB Cable provided with the Alnor CF920/A
IRFLOW
IAQ920 to
connect the instrument to a computer. Connect the end labeled
“COMPUTER” to the computer USB port and the other end to the data port
of the Alnor CF920/A
IRFLOW
IAQ920.
For more information on how to download stored data see Chapter 3 section
titled
.
Caution:
This symbol is used to indicate that the data port
of the Alnor CF920/A
IRFLOW
IAQ920 is
not
intended for
connection to a public telecommunications network.
Connect the USB data port only to another USB port.
