Hanna Instruments hi 93748 Manuale Utente

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 cuvet up to 1.5 cm (¾")

below the rim with 10 mL of deion-
ized water.

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

below the rim with 10 mL of sample.

• Add the content of one packet of

HI 93748A ascorbic acid to each
cuvet, replace the caps and shake
gently.

• Add 0.2 mL of the HI

93748B alkaline-cya-
nide reagent solution to
each cuvet, replace the
caps and shake gen-
tly.

• Add 1 mL of the HI

93748C 0.1% PAN in-
dicator solution to each
cuvet, replace the caps
and shake gently.

• Place the cuvet with the re-

acted deionized water (blank)
into the holder and ensure
that the notch on the cap is
positioned securely into the
groove.

OFF

1.5 cm

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

down prior to zeroing the blank. Alternatively wait for 2
minutes and press ZERO. In both cases "SIP" will
appear during zeroing.

• Wait for a few seconds and the dis-

play will show "-0.0-". Now the meter
is zeroed and ready for measure-
ment.

• Insert the second cuvet with

the reacted sample into the
instrument.

• Press READ DIRECT. "SIP" will appear during measure-

ment.

• The instrument directly displays concentration in µg/L of

manganese on the 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 the
turbidity.

INTERFERENCES

Interference may be caused by:
Aluminum above 20 mg/L
Cadmium above 10 mg/L
Calcium above 200 mg/L as CaCO

Cobalt above 20 mg/L
Copper above 50 mg/L
Iron above 10 mg/L
Lead above 0.5 mg/L
Magnesium above 100 mg/L as CaCO

Nickel above 40 mg/L
Zinc above 15 mg/L.

ZERO

2’

READ

TIMED

READ

DIRECT

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 93748-01 Reagents for manganese LR (100 pcs of

HI93748A-0, 20 mL of HI93748B-0, 100 mL
of HI93748C-0, 20 mL of HI93703-51)

HI 93748-03 Reagents for manganese LR (300 pcs of

HI93748A-0, 60 mL of HI93748B-0, 300 mL
of HI93748C-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

IST93748R1

06/98

PRINTED IN PORTUGAL