User Guide

OPERATIONAL GUIDE
ON
OFF
MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “- - -”, it is
ready.
• Fill the cuvet up to 1.5 cm (¾”) below
the rim with 10 mL of unreacted sample,
and replace the cap.
• 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 dis-
play will show “-0.0-”. Now the meter
is zeroed and ready for measurement.
• Remove the cuvet.
• Add the content of one
packet of HI 93707 re-
agent. Replace the cap
and shake gently.
• Reinsert the cuvet into the in-
strument.
1.5 cm
ZERO
READ
TIMED
12
3
6
9
6’
READ
DIRECT
• Press READ TIMED and the display will show the count-
down prior to the measurement, or, alternatively wait
for 6 minutes and press READ DIRECT. In both cases
“SIP” will appear during measurement.
• The instrument directly displays concentration in mg/L of
nitrite nitrogen.
• To convert the NO
2
–
-N concentration to the nitrite ion
concentration (NO
2
–
), multiply the reading by factor of
3.29.
• To convert the NO
2
–
-N concentration to sodium nitrite
concentration (NaNO
2
), multiply the reading by factor of
4.93.
INTERFERENCES
Interference may be caused by the following ions:
ferrous, ferric, cupric, mercurous, silver, antimonious, bis-
muth, auric, lead, metavanadate and chloroplatinate.
Strongly reducing and oxidizing reagents.
High levels of nitrate (above 100 mg/L) could yield falsely
high readings due to a minute amount of reduction to
nitrite that could occur at these levels.
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-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
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 93707-01 Reagents for 100 tests
HI 93707-03 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
IST93707R1 06/98
PRINTED IN PORTUGAL