3
Chapter 2
Setting-up
Supplying Power to the Alnor AVM440/Airflow Instruments
TA440
The Alnor
®
AVM440/Airflow™ Instruments TA440
is powered with
four size AA batteries.
Installing the Batteries
Insert four AA batteries as indicated by the diagram located on
the inside of the battery compartment. The Alnor AVM440/ Airflow
Instruments TA440 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
will not recharge the batteries.
Using the Telescoping Probe
The telescoping probe contains the velocity, temperature, and
humidity sensors. When using the probe, make sure the sensor
window is fully exposed and the orientation dimple is facing upstream.
N o t e
For temperature and humidity measurements, make sure that at
least 3 inches (7.5 cm) of the probe is in the flow to allow the
temperature and humidity sensors to be in the air stream.
Extending the Probe
To extend the probe, hold the handle in one hand while pulling on
the probe tip with the other hand. Do
not
hold the cable while
extending the probe as this prevents the probe from extending.
Retracting the Probe
To retract the probe, hold the handle in one hand while pulling
gently on the probe cable with the other hand.
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