9
GUIDE TO DISPLAY CODES
After Timer is pressed, a blinking hourglass icon appears and the
display shows a 2 minutes coundown. Also the Zero tag might
blink if no zero measurement has been made before. At the end an
acoustic signal alerts the user that the countdown has finished.
Indicates that the instrument is in a ready state and waiting for the
next command (Timer or Zero).
These prompts indicate the type of power supply: “Line” (if the
external power supply is used) or the battery level.
This prompt appears for a few seconds each time the instrument is
turned ON.
The instrument is zeroed and a measurement can be made.
Indicates that the meter is making a measurement.
Batteries voltage is getting low and the batteries need to be
replaced.
Indicates that the meter is performing a zero measurement. The
light intensity is automatically re-adjusted (auto-calibration features)
if necessary.
12
• Whenever the cuvet is placed into the measurement
cell, it must be dry outside, and completely free of
fingerprints, oil or dirt. Wipe it thoroughly with
HI 731318
(tissue for wiping cuvets, see chapter
ACCESSORIES) or a lint-free cloth prior to insertion.
• Do not let the reacted sample stand too long after
reaction, or accuracy will be lost.
• After the reading it is important to discard immediately
the sample, otherwise the glass might become
permanently stained.
• All the reaction times reported in this manual are
referred to 20°C (68°F). As a general rule of thumb,
they should be doubled at 10°C (50°F) and halved at
30°C (86°F).
