Hanna Instruments hi 93740 Manual Do Utilizador

OPERATIONAL GUIDE

MEASUREMENT PROCEDURE

• Turn the meter on by pressing ON/OFF.
Note: for best results perform your tests

between 20-24°C.

• When the LCD displays "- - -", it is

ready.

• Fill one graduated beaker with 25 mL of

deionized water (blank) and another one
with 25 mL of sample.

• Add the content of one packet of

HI 93740A phthalate-phosphate re-
agent to each beaker. Cap and shake
gently until the reagent is dissolved.

Note: If sample contains iron (Fe

), it is important that

all powder be dissolved completely before continuing
with following step.

• Add 1 mL of HI 93740B 0.3%

PAN solution to each beaker, swirl
to mix and then wait for 15 min-
utes.

• Add one packet of HI 93740C EDTA

reagent to each beaker, cap and
swirl to mix until complete dissolution.

• Fill one cuvet up to 1.5 cm (¾") below

the rim with 10 mL of the blank.

• 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.

1.5 cm

OFF

ZERO

1.5 cm

• Wait for a few seconds and the dis-

play will show "-0-". Now the meter
is zeroed and ready for measurement.

• Fill a second cuvet up to 1.5 cm (¾")

below the rim with 10 mL of the
reacted sample.

• Insert the second cuvet into the

instrument.

• Press READ DIRECT and "SIP" will appear during mea-

surement.

• The instrument directly displays concentration in mg/L of

nickel on the Liquid Crystal Display.

Note: a temperature above 30°C may cause turbidity. In

this case, before zeroing and taking readings, add
2-3 drops of Dispersing Agent (HI93703-51) to each
cuvet and swirl until complete dissolution of turbidity.

INTERFERENCES

Interference may be caused by:
Co

must not be present

above 32 mg/L

above 1000 mg/L (as CaCO

)

above 20 mg/L

–

above 8000 mg/L

above 20 mg/L

above 40 mg/L

above 15 mg/L

–

above 20 mg/L

above 10 mg/L

above 500 mg/L

above 400 mg/L

above 25 mg/L

above 60 mg/L

above 5000 mg/L

above 20 mg/L

above 30 mg/L

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.

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

REAGENT SETS

HI 93740-01 Reagents (100 pcs of HI93740A-0, 100mL of

HI93740B-0, 100 pcs of HI93740C-0, 20 mL
of HI93703-51)

HI 93740-03 Reagents (300 pcs of HI93740A-0, 300mL of

HI93740B-0, 300 pcs of HI93740C-0, 60 mL
of HI93703-51)

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

IST93740R1

11/98

PRINTED IN PORTUGAL