Hanna Instruments hi 93706 User Manual

MEASUREMENT PROCEDURE

• Turn the meter on by pressing

ON/OFF.

• When the LCD displays “- - -”,

it is ready.

• Fill the cuvet with 10 mL of

unreacted sample, up to the
mark, 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 10 drops of HI 93706A-0

Phosphorus Reagent A
(Molybdate) to the cuvet.

• Add the content of one packet

of HI 93706B-0 Phosphorus
Reagent B (Amino Acid) to the
cuvet.

ON

OFF

ZERO

READ

TIMED

12

3

6

9

5’

READ

DIRECT

• Replace the cap and shake

gently until dissolution is
complete.

• Reinsert the cuvet into the

instrument.

• Press READ TIMED and the display will show the

countdown prior to the measurement or, alternatively,
wait for 5 minutes and press READ DIRECT. In both
cases “SIP” will appear during measurement.

• The instrument directly displays concentration in mg/L

of phosphorus on the Liquid Crystal Display.

INTERFERENCES

Interference may be caused by:
Sulfide
Chloride above 150000 mg/L as Cl

–

Calcium above 10000 mg/L as CaCO

3

Magnesium above 40000 mg/L as CaCO

3

Ferrous iron above 100 mg/L.
Color or suspended matter in large amounts will cause
interference. Therefore the turbidity should be removed by
prior filtration.

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

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 unaccept-
able 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 micro-
wave ovens.

REAGENT SETS

HI 93706-01 Reagents for 100 tests
HI 93706-03 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).

IST93706R5

09/03