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 display 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 Nitrite LR
Reagent. Replace the cap and shake gently.
ZERO
READ
TIMED
12
3
6
9
6’
READ
DIRECT
• Reinsert the cuvet into the
instrument.
• Press READ TIMED and the display will show the
countdown 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, bismuth,
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 measurements,
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).
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
SLIDE
OFF
Recommendations for Users
Before using these products, make sure that they are entirely suitable for the environment
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.
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).
Operational Guide
Tips for an Accurate Measurement
Accessories
CE Declaration of Conformity
Battery Replacement
Read the relevant SDS sheets before performing the test.
Safety Data Sheets are available at: www.hannainst.com
Safety Data Sheets
10 mL