Section 4: Batteries and External Power
HOBO Energy Logger User’s Guide
27
selecting the type of batteries to use for your application, refer to
Selecting batteries on page 23.
2.
Using a Phillips head screwdriver, loosen the screw on the back
of the battery compartment door. Remove the door.
Figure 6: Replacing Batteries
3.
Remove the used batteries and dispose of them properly.
4.
Install eight new 1.5 V AA batteries, using care to match the
polarity marked in the battery compartment.
Do not mix battery
types.
5.
Position the battery compartment door in place and tighten the
screw to secure it.
Do not over-tighten the screw
.
Recovering Data from a Logger with Dead Batteries
The logger uses very durable, high-capacity Flash memory. With this
memory, data is retained even when the batteries are dead or removed.
If the logger stops recording data because the batteries are dead, you can
recover the data that has been recorded. Simply replace the batteries and
then read out the data from the logger as usual.
Important:
Do not relaunch the logger until the data has been recovered.
If, after changing the batteries, you are still unable to read out your
Loosen screw on battery
compartment door
Insert batteries into
battery compartment
Section 4: Batteries and External Power
28
HOBO Energy Logger User’s Guide
logger, contact the vendor that sold it to you. It may be possible to
retrieve the logged data.
External Power Sources
An external power source can reduce or eliminate the need for internal
batteries in applications that have readily available AC power, or require
more current and/or longer deployments than the logger's internal
batteries can support. The logger can operate on a DC input voltage from
several external sources including:
•
Standard 12 V automotive/motorcycle type battery
•
Sealed lead-acid (SLA) type 12 V battery (used in
uninterruptible power supplies and emergency lighting systems)
•
External alkaline/lithium battery packs
•
Optional AC power adapter (Onset part # P-AC-1)
There are two ways you can use an external power source:
•
Battery eliminator mode -
In place of the internal batteries. In
this mode, the logger can operate on a DC input voltage ranging
8 V – 15 V.
•
Battery backup mode -
To conserve the internal batteries as an
automatic back-up supply if the external supply should fail,
similar to an uninterruptible power supply. To do this, you must
provide a DC input voltage
greater than
that of the internal
batteries. Thus, a DC input voltage of 13.6 V – 15 V is required
for proper operation.
External Power Adapter Specifications
•
Able to deliver 750mA
•
Positive outer sleeve
•
2.1 mm center pin diameter
•
5.5 mm outer sleeve diameter
•
10 mm outer sleeve length
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