HF scientific DRT-15CE Portable Turbidimeter - Manual (Page 10)

DRT-15CE (5/10) Page 2
3.0 PRE-OPERATION CHECKOUT
Extreme care should be taken when handling the Calibration Standard or
sample cuvettes as surface scratches or finger smudges will cause analysis
errors. Handle these items by the top only.
The battery, when new, usually requires several cycles of dis charging and
recharg ing in order to obtain optimum rated life between charges.
The turbidimeter provides up to 20 hours of continuous opera tion as a port-
able battery operat ed unit between re charges.
It is recommended that the unit be turned off between readings in order to
obtain longer battery life between recharg es. If used as a stationary unit
leave the charger plugged in, but TURN OFF INSTRUMENT WHEN
NOT IN USE. This will keep the battery at an optimum level at all times.
If for some reason the battery has been completely discharged, the display
may not come "on" at all. If this happens turn the unit "off" and recharge the
battery with the battery charger. To establish that the unit may be used while
charging, turn the unit on periodically and observe the lower left corner of
the display for the word "BAT". When it goes off, (can no longer be seen
while the rest of the display is on), the instrument may be used while the
charger "tops off" the battery. Depending on the state of discharge of the
battery, it may take as long as 6 - 8 hrs. to fully charge. If the "BAT" indicator
is "on", when the charger is not connected, the battery requires charging.