Hanna Instruments HI 96736-24 User Manual

Hanna Instruments Measuring instruments

INSTRUCTION MANUAL

HI 96736

Hardness

and pH

ISM

w w w . h a n n a i n s t . c o m

Preliminary examination:

Please examine this product carefully. Make sure that the instru-

ment is not damaged. If any damage occured during shipment,

please notify your Dealer.
Each HI 96736 Ion Selective Meter is supplied complete with:
• Two Sample Cuvettes and Caps
• 9V Battery
• Instruction Manual
Note:

save all packing material until you are sure that the

instrument works correctly. Any defective item must be

returned in its original packing.

For more details about spare parts and accessories
see “Accessories”.

Dear Customer,
Thank you for choosing a Hanna product. This manual will provide

you with the necessary information for the correct use of the

instrument. Please read it carefully before using the meter. If you

need additional technical information, do not hesitate to e-mail

us at [email protected].

Technical specifications:

Range

Mg Hardness

0.00 to 2.00 mg/L

Ca Hardness

0.00 to 2.70 mg/L

Total Hardness

0.00 to 4.70 mg/L

6.5 to 8.5

Resolution

0.01 mg/L Hardness
0.1 pH

Accuracy

Mg Hardness

±0.11 mg/L ±5% of reading @ 25°C

Ca Hardness

±0.11 mg/L ±5% of reading @ 25°C

±0.1 pH @ 25°C

Typical EMC Dev.

±0.02 mg/L Mg Hardness
±0.02 mg/L Ca Hardness
±0.1 pH

Light Source

Tungsten lamp

Light Detector

Silicon Photocell with narrow band interference
filter @ 525 nm

Method

For hardness: Adaptation of the

Standard Methods for the

Examination of Water and Wastewater, 18

Edition, colo-

rimetric method. The reaction between Mg/Ca and reagents

causes a violet tint in the sample.
For pH: Phenol red method. The reaction with reagents
causes a red tint in the sample.

Environment

0 to 50°C (32 to 122°F);

max 95% RH non-condensing

Battery Type

1 x 9 volt

Auto-Shut off

After 10' of non-use in measurement mode;

after 1 hour of non-use in calibration mode;

with last reading reminder.

Dimensions

192 x 104 x 69 mm (7.6 x 4.1 x 2.7”)

Weight

360 g (12.7 oz.).

1. RANGE/GLP/ key: press to change the paramter, press and

hold for three seconds to enter

GLP mode. In calibration mode

press to edit the date and time.

2. CAL CHECK key: press to perform the validation of the meter,

or press and hold for three seconds to enter

calibration mode.

3. ZERO/CFM key: press to zero the meter prior to measurement,

to confirm edited values or to confirm factory calibration
restore.

4. READ/ /TIMER key: In

measurement mode, press to make a

measurement, or press and hold for three seconds to start a
pre-programmed countdown prior to measurement. In

GLP

mode press to view the next screen.

5. ON/OFF key: to turn the meter on and off.
6. Liquid Crystal Display (LCD)
7. Cuvette alignment indicator
8. Cuvette holder

DISPLAY ELEMENTS DESCRIPTION:

Functional description:

1. The measuring scheme (lamp, cuvette, detector), appears

during different phases of zero or reading measurement

2. Error messages and warnings
3. The battery icon indicates the change state level of the battery
4. The hourglass appears when an internal check is in progress
5. Status messages
6. The chronometer appears when the reaction timer is running
7. The month, day and date icons appear when a date is

displayed

8. Four digit main display
9. Measuring units
10. Four digit secondary display

Light High:

There is too much light to

perform a measurement. Please check the

preparation of the zero cuvette.

Light Low:

There is not enough light to

perform a measurement. Please check the

preparation of the zero cuvette.

No Light:

The instrument cannot adjust

the light level. Please check that the sample

does not contain any debris.

Errors and warnings:

ON ZERO READING:

ON SAMPLE READING:

DURING CALIBRATION PROCEDURE:

OTHER ERRORS AND WARNINGS:

Cap error:

Appears when external light

enters in the analysis cell. Assure that the

cuvette cap is present.
Cooling lamp:

The instrument waits for

the lamp to cool down.

Battery low:

The battery must be replaced

soon.

Dead battery:

This indicates that the

battery is dead and must be replaced. Once

this indication is displayed, normal

operation of the instrument will be

interrupted. Change the battery and restart

the meter.

Standard Low:

The standard reading is

less than expected.

Standard High:

The standard reading is

higher than expected.

Inverted cuvettes:

The sample and the

zero cuvette are inverted.

Zero:

A zero reading was not taken. Fol-

low the instructions of the measurement

procedure for zeroing the meter.
Under range:

A blinking value of the

minimum concentration indicates that the

sample absorbs less light than the zero

reference. Check the procedure and make

sure you use the same cuvette for reference

(zero) and measurement.
Over Range:

A flashing value of the

maximum concentration indicates an over

range condition. The concentration of the

sample is beyond the programmed range:

dilute the sample and re-run the test.

1• Turn the meter on by pressing ON/OFF.

2• When the beeper sounds briefly and the

LCD displays dashes and “P1” (Total

Hardness) and “P2” (pH) the meter is

ready. The code that appears on the

secondary display is the one of the last

selected parameter. If necessary, press

RANGE/GLP/

to change parameter.

The blinking “ZERO” indicates that the

instrument needs to be zeroed first.

3• For Total Hardness: Fill a graduated

beaker up to the 50mL mark with the

sample. Add 0.5 mL of HI 93719A-0

Calcium And Magnesium Reagent indicator

solution and mix.
Add 0.5 mL of HI 93719B-0 Alkali solution

for Calcium and Magnesium and mix. Fill

three cuvettes with 10mL of sample each.

Add 1 drop of HI 93719C-0 EDTA solution

to one cuvette, replace the cap and swirl

the solution. This is the ZERO sample.

Add 1 drop of HI 93719D-0 EGTA solution

to the second cuvette, replace the cap

and swirl the solution. This is the READ1

sample.

For pH: Fill the cuvette with 10 mL of

unreacted sample, up to the mark, and

replace the cap.

4• Place the cuvette into the holder and

ensure that the notch on the cap is

positioned securely into the groove.

5• Press ZERO/CFM and the lamp, cuvette

and detector icons will appear on the

display, depending on the measurement

phase.

For Total Hardness: Place the ZERO sample

into the holder and ensure that the

notch on the cap is positioned securely

into the groove. Press ZERO/CFM and

the lamp, cuvette and detector icons will

appear on the display, depending on the

measurement phase. After a few seconds

the display will show “-0.0-”. Remove

the ZERO sample and insert the READ1

sample into the instrument. Press and

hold READ/ /TIMER for three seconds

The display will show the countdown prior

to measurement. The beeper is playing a

beep at the end of countdown period.

Alternatively, wait for 30 seconds. The

lamp, cuvette and detector icons will appear

on the display, depending on the

measurement phase, then the instrument

will display the level of Magnesium

hardness in mg/L CaCO

(togheter with

“n”).

6• After a few seconds the display will show

“-0.0-”

. The meter is now zeroed and

ready for measurement (except for

Hardness).

7• Remove the cuvette.

8• Add the specific test reagent for each

parameter:

Total hardness: the third cuvette (nothing

is added)

pH: 5 drops of HI 93710-0

9• Replace the cap and swirl the solution:

for pH invert several times to mix.

10•Replace the cuvette into the holder and

ensure that the notch on the cap is

positioned securely into the groove.

Measurement procedure:

Measurement

5-6

8-9