User Guide

OPERATIONAL GUIDE
MEASUREMENT PROCEDURE
• Turn the meter on by pressing
ON/OFF.
• When the LCD displays “- - -”,
it is ready.
• Fill a cuvet with 1 mL of unreacted sample, by means
of the syringe.
• Using the plastic pipette, add
9 mL of HI 93733B-0
reagent, up to the 10 mL
mark. Place the cap and
swirl the solution to mix.
• 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
• Add 4 drops of
HI 93733A-0
reagent. Replace
the cap and swirl
the solution.
• Reinsert the cuvet into the
instrument.
• Press READ TIMED and the display will show the countdown
prior to the measurement or, alternatively, wait for 3
minutes and 30 seconds and press READ DIRECT. In
both cases “SIP” will appear during measurement.
• The instrument directly displays concentration in mg/L of
ammonium ion (NH
4
+
).
• To convert the reading to mg/L of ammonia (NH
3
),
multiply by the factor 0.944. To convert the reading to
mg/L of ammonia nitrogen (NH
3
-N), multiply by the
factor 0.778.
INTERFERENCES
Interference may be caused by:
Hardness above 1 g/L
Iron
Sulfide
Glycine
Various aliphatic and aromatic amines
Organic chloramines
Acetone
Aldehydes
Alcohols.
ACCESSORIES
• 1 mL syringe
• 1 plastic pipette
READ
TIMED
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.
• 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).
TIPS FOR AN ACCURATE
MEASUREMENT
BATTERY REPLACEMENT
Battery replacement must only take place in a non-hazardous
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
SLID
E
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
REAGENT SETS
HI 93733-01 Reagents for 100 tests
HI 93733-03 Reagents for 300 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
OF CONFORMITY
IST93733R3 10/02
ZERO