DELTA LTL-XL Retroreflectometer 37
SECTION 4
MAINTENANCE
General care
The LTL-XL retroreflectometer is constructed for outdoor use in ordinary good weather con-
ditions. It will stand moist weather with wet roads, but caution must be taken against heavy
rain and dirt. The LTL-XL retroreflectometer is an optical instrument and shall be handled as
such. Avoid shock and vibration if possible.
Protection window
The protection window is accessible from underneath of the instrument. The protection win-
dow is coated with a high-efficiency anti-reflection coating. Take care not to damage this
coating when cleaning. Compressed air or a fine brush can be used for removing loose parti-
cles/dust. If this is not sufficient the window should by cleaned using a soft paper tissue or
cloth and some window cleaning liquid.
MAKE SURE THE PROTECTION WINDOW IS CLEAN AND UNDAMAGED AT ANY
TIME TO ENSURE CORRECT MEASUREMENT RESULTS
Battery
The LTL-XL retroreflectometer is equipped as standard with a 12V/2.1 Ah NiMH (Nickel-
Metal Hydride) battery. A high capacity 12V/4.5 Ah NiMH battery may be installed as an op-
tion to add more measurements on one charge. Under normal use, these batteries require no
maintenance. However it is recommended to keep the battery fully charged. A fully charged
battery is more capable of withstanding degeneration.
A mains powered 15V power supply for charging is supplied as customary delivery. The in-
strument will automatically power on when the power adaptor is connected. The battery icon
in the upper right corner indicates the charging state.
The standard 2.1 Ah battery typically yields ~ 1,100 measurements when fully charged. The
charge time for the 2.1Ah battery is ~1½ hours.
The 4.5Ah battery typically yields ~2,500 measurements when fully charged. The charge time
for the 4.5Ah battery is ~3½ hours.
For “field” charging the 15V power supply could be powered from an “AC power inverter”
connected to the car battery.
When storing the instrument for a long period of time fully charge the battery.
THE BATTERY SUPPLIED WITH LTL-XL IS SPECIALLY DESIGNED FOR THE
INSTRUMENT TO ENSURE SAFE USE. IF A NON DELTA SUPPLIED OR APPROVED
BATTERY IS USED, DELTA CAN TAKE NO RESPONSIBILITY FOR ANY DAMAGES
CAUSED DUE TO THE PERFORMANCE OF THIS BATTERY.
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