IN-E-HL20-V1_16
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroLog HL20 and HL21 data logger:
User Guide
Instruction Manual
Document Type
Page
6
of 23
Document title
2.3 Batteries
All models ship with three AA batteries which must be inserted first (see battery replacement).
Note
:
To conserve battery power, models with the LC display are shipped with the Display Sleep function
enabled and set to 1 minute (see Software Functions). When the function key has not been pressed
for some time (in this case 1 minute), the display sleep function automatically turns the display off.
The display can be temporarily turned on at any time by pressing on the function key.
2.3.1 Battery lifetime
The battery lifetime depends on the manner in which the HL20 or HL21 is being used. The following
examples are based on the following assumptions:
o
Fresh set of AA batteries (2900 mAh)
o
Display backlight turned off (if applicable)
o
Log interval set to 30 minutes
Battery lifetime in months
Models w/o LC display
20
Models with LC display, display sleep function set to 1 minute
13
Models with LC display, display sleep function disabled
5
2.4 Real time clock
After inserting a fresh set of batteries for the first time, the real time clock must be adjusted prior to
using the HL20 or HL21 (see “Operation”). The real time clock is powered from a large capacitor
and can run for up to 4 hours without the batteries. Removing the battery for an extended period of
time will cause the logger to completely lose track of the date and time.
Because of the requirement to always keep track of the date and time, the HL20 and HL21 do not
have a power on/off switch.
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IN-E-HL20-V1_16
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