ROTRONIC HygroLog HL-NT - Manual (Page 8)

IN-E-HL-NT-V2_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroLog HL-NT data logger:
instruction manual Instruction Manual
Document Type
Page 8 of 48
Document title
© 2009-2012; Rotronic AG IN-E-HL-NT-V2_12
2.4 Power supply
The HygroLog HL-NT ships with a regular 9V battery which must be inserted first (see battery
replacement).
To conserve battery power, models with the LC display and keypad are shipped with the Display
Sleep function enabled (see Software Functions). When the keypad has not been used for some
time, this function automatically turns off the display off. The display can be temporarily activated
by pressing on any key of the keypad.
When connected to a docking station, the HygroLog HL-NT can be powered with an external AC
adapter.
Note: most models of docking station require the use of an external AC adapter due to the current
consumption of the docking station internal electronics.
After reconfiguring the HygroLog HL-NT with the ROTRONIC HW4.software, a rechargeable
battery (accumulator) can be used instead of a regular battery. Recharging the battery require a
docking station and an external AC adapter.
WARNING: Trying to recharge a regular battery is potentially dangerous. Whenever a
regular battery is being used, the logger should be configured with the internal battery
charge function disabled.
2.4.1 Battery lifetime
The battery lifetime depends on the manner in which the HygroLog HL-NT is being used. The
HygroLog HL-NT has a battery lifetime of one year when just one HygroClip probe is being used
(standard 500 mAh alkaline battery), when no docking station with internal electronics is
connected to the HygroLog HL-NT and when the logger is configured / programmed as follows:
● Display Sleep function enabled (models with display)
● No docking station with internal electronics
● LED and beeper functions disabled
● Log interval set to 15 minutes
Additional examples of battery lifetime (LED turned off, Logging active): in the following table,
LCD means that the LC display is permanently on (Display Sleep function disabled). No docking
station with internal electronics is connected to the HygroLog HL-NT.
Lifetime in days
Rechargeable
Battery
120mAh
Rechargeable
Battery
150mAh
Regular
Battery
500mAh
Regular
Battery
1000mAh
1 Probe / 5s Interval 2.7 3.4 11 22
1 Probe / 5s Interval / LCD 2.1 2.6 8.9 17
1 Probe / 1min Interval 14 17 59 118
1 Probe / 1min Interval / LCD 5.8 7.3 24 48
1 Probe / 15min Interval 89 111 372 744
1 Probe / 15min Interval / LCD 8.9 11 37 74