Hanna Instruments hi 93730 User Manual

OPERATIONAL GUIDE

OFF

MEASUREMENT PROCEDURE

• Turn the meter on by pressing ON/OFF.

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

ready.

• Fill one cuvet with 10 mL of sample up

to 1.5 cm (¾") below the rim 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 mea-
surement.

• Fill one graduated mixing cylin-

der up to the 25 mL mark with
the sample.

• Add the content of one packet of HI 93730A molybde-

num reagent, close the cylinder and invert several times
until the powder is completely dissolved.

1.5 cm

ZERO

• Add the content of one packet of HI 93730B molybde-

num reagent to the cylinder, close it and invert several
times until the powder is completely dissolved.

• Add the content of one packet of HI 93730C molybde-

num reagent to the cylinder, close it and shake for 15"
until powder has dissolved.

• Press READ TIMED and the display will show the count-

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

• During the 5 minutes waiting time, fill an empty cuvet

with 10 mL of the reacted sample up to 1.5 cm (¾")
below the rim, replace the cap and reinsert the cuvet
into the instrument.

• The instrument directly displays concentration in mg/L of

molybdenum on the Liquid Crystal Display.

READ

TIMED

5’

READ

DIRECT

1.5 cm

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

INTERFERENCES

Interference may be caused by:
Aluminum above 50 mg/L

Chromium above 1000 mg/L

Copper above 10 mg/L

Iron above 50 mg/L

Nickel above 50 mg/L

Nitrite, as NO

–

Sulfate above 200 mg/L

Highly buffered samples or with extreme pH may exceed the
buffering capacity of the reagents.

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 93730-01 Reagents for 100 tests
HI 93730-03 Reagents for 300 tests0

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

IST93730R1

06/98

PRINTED IN PORTUGAL