User Guide

9
A zero reading was not taken. Follow the
instruction described in the measurement
procedures for zeroing the meter.
Under range. A blinking "0.00" indicates
that the sample absorbs less light than the
zero reference. Check the procedure and
make sure that you use the same cuvet for
reference (zero) and measurement.
1) A flashing value of the maximum con-
centration indicates an over range condi-
tion. The concentration of the sample is
beyond the programmed range: dilute the
sample and rerun the test.
2) A flashing value lower than the maxi-
mum concentration indicates a low signal-
to-noise ratio condition. In this case accu-
racy of the result is not guaranteed. Repeat
the reading procedure.
The sample and zero cuvet are inverted.
b) on sample reading:b) on sample reading:
b) on sample reading:b) on sample reading:
b) on sample reading:
There is too much light for the sample
measurement. Please check if the right
sample cuvet is inserted.
44
• Press ZERO and “SIP” will appear on the display.
• Wait for a few seconds and the display will
show “-0.0-”. Now the meter is zeroed
and ready for measurement.
• Remove the cuvet and add
the content of one packet
of HI 93750B reagent. Re-
place the cap and mix
gently for one minute by
turning slowly the cuvet up-
side down.
• Reinsert the cuvet into the instrument.
• Press TIMER and the display will show the countdown prior to the
measurement or, alternatively, wait for 2 minutes and press READ
DIRECT. In both cases “SIP” will blink during measurement.
• The instrument directly displays concentration in mg/L (ppm) of
potassium (K).
• To convert the reading to mg/L of potassium oxide (K
2
O), multiply
by a factor of 1.20.
• For ULTRA HIGH RANGE samples: follow procedure described at
page 45.
INTERFERENCES
The following ions do not interfere below the concentrations reported:
Ammonium 10 ppm Calcium 10000 ppm as CaCO
3
Chloride 12000 ppm Magnesium 8000 ppm as CaCO
3
Sodium 8000 ppm
Potassium HR