OPERATIONAL GUIDE
OPERATIONAL GUIDE
OPERATIONAL GUIDE
OPERATIONAL GUIDE
OPERATIONAL GUIDE
MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “- - -”, it is
ready.
• Fill the cuvet with 10 mL of unre-
acted sample up to the mark.
• Add six drops of HI 93750A-0, replace the cap and
swirl the solution.
• Place the cuvet into the holder
and ensure that the notch on
the cap is positioned securely
into the groove.
• 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.
ON
OFF
ZERO
• Add one packet of HI 93750B-0 reagent. Replace the
cap and mix very gently for one minute by turning the
cuvet upside down.
• Reinsert the cuvet into the instru-
ment.
• Press READ TIMED and the display will show the count-
down prior to the measurement or, alternatively, wait
for 2 minutes and press READ DIRECT. In both cases
“SIP” will appear during measurement.
• The instrument directly displays concentration in mg/L
(ppm) of potassium (K).
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
Color or suspended matter in large amounts will cause
interference. Therefore the turbidity should be removed by
prior filtration.
For best results samples should be tested at room tempera-
ture (20°C or 68°F). Lower temperatures will result in
higher readings.
The instruction listed below should be carefully followed
during testing to ensure best accuracy.
• Do not touch the cuvet walls with hands.
• In order to maintain the same conditions during the
zeroing and the measuring phases, it is necessary to
close the cuvet to prevent any contamination.
• Do not let the test sample stand too long after reagent
is added or accuracy will be lost.
• Whenever the cuvet is placed into the measurement cell,
it must be completely free of fingerprints, oil or dirt.
Wipe it thoroughly with
HI 731318
or a lint-free cloth
prior to insertion.
• It is important that the sample does not contain any
debris. This would corrupt the readings.
• It is possible to take multiple readings in a row, but it
is recommended that a zero reading be taken for each
sample and that the same cuvet is used for zeroing and
measurement.
• It is important to discard the sample immediately after
the reading is taken because the glass might become
permanently stained.
• Shaking the cuvet can generate bubbles in the sample,
causing higher readings. To obtain accurate measure-
ments, remove such bubbles by swirling or by gently
tapping the vial.
TIPS FOR AN ACCURATE
TIPS FOR AN ACCURATE
TIPS FOR AN ACCURATE
TIPS FOR AN ACCURATE
TIPS FOR AN ACCURATE
MEASUREMENT
MEASUREMENT
MEASUREMENT
MEASUREMENT
MEASUREMENT
BATTERY REPLACEMENT
BATTERY REPLACEMENT
BATTERY REPLACEMENT
BATTERY REPLACEMENT
BATTERY REPLACEMENT
Battery replacement must only take place in a non-hazard-
ous area using a 9V alkaline battery.
Simply slide off the battery cover on the back of the meter.
Detach the battery from the terminals and attach a fresh
9V battery while paying attention to the correct polarity.
Replace the battery and the cover.
9V
SLIDE
OFF
Recommendations for Users
Before using these products, make sure that they are entirely suitable for the environ-
ment in which they are used.
Operation of these instruments in residential area could cause unacceptable interferences
to radio and TV equipments, requiring the operator to take all necessary steps to correct
interferences.
Any variation introduced by the user to the supplied equipment may degrade the
instruments' EMC performance.
To avoid damages or burns, do not perform any measurement in microwave ovens.
ACCESSORIES
ACCESSORIES
ACCESSORIES
ACCESSORIES
ACCESSORIES
REAGENT SETS
HI 93750-01
Reagents for 100 tests
OTHER ACCESSORIES
HI 710009
Blue rubber boot
HI 710010
Orange rubber boot
HI 721310
9V battery (10 pcs)
HI 731318
Tissue for wiping cuvets (4 pcs)
HI 731321
Glass cuvets (4 pcs)
HI 731325
Caps for cuvets (4 pcs)
HI 93703-50
Cuvets cleaning solution (230 mL).
CE DECLARATION
CE DECLARATION
CE DECLARATION
CE DECLARATION
CE DECLARATION
OF CONFORMITY
OF CONFORMITY
OF CONFORMITY
OF CONFORMITY
OF CONFORMITY
IST93750
09/99
PRINTED IN PORTUGAL
READ
TIMED