Hanna Instruments HI 96710C Manual de usuario

Instruction Manual

HI 96710C

pH & Chlorine ISM

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

TABLE OF CONTENTS

PRELIMINARY EXAMINATION ................................................................................................ 3

GENERAL DESCRIPTION ....................................................................................................... 4

ABBREVIATIONS .................................................................................................................. 4

SPECIFICATIONS ................................................................................................................... 5

PRECISION AND ACCURACY .................................................................................................. 6

PRINCIPLE OF OPERATION ................................................................................................... 6

FUNCTIONAL DESCRIPTION .................................................................................................. 8

ERRORS AND WARNINGS .................................................................................................. 10

GENERAL TIPS FOR AN ACCURATE MEASUREMENT ............................................................. 12

STARTUP ........................................................................................................................... 13

RANGE SELECTION ............................................................................................................. 14

MEASUREMENT PROCEDURE ............................................................................................. 14

VALIDATION PROCEDURE ................................................................................................... 20

CALIBRATION PROCEDURE ................................................................................................. 21

GLP ................................................................................................................................... 24

BATTERY MANAGEMENT .................................................................................................... 25

BATTERY REPLACEMENT .................................................................................................... 25

ACCESSORIES ..................................................................................................................... 26

WARRANTY........................................................................................................................ 27

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.

All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner,

Hanna Instruments Inc., Woonsocket, Rhode Island, 02895 , USA.

PRELIMINARY EXAMINATION

Please examine this product carefully. Make sure that the instrument is not damaged. If any

damage occurred during shipment, please notify your Dealer.

Each HI 96710 Ion Selective Meter is supplied complete with:

• Two Sample Cuvettes and Caps

•CAL CHECK standard cuvettes

• 9V Battery

• Scissors

• Cloth for wiping cuvettes

• Instrument quality certificate

• Instruction Manual

• Rigid carrying case

Note:Save all packing material until you are sure that the instrument works correctly. Any

defective item must be returned in its original packing.

GENERAL DESCRIPTION

ABBREVIATIONS

The HI 96710 is an auto diagnostic portable microprocessor meter that benefits from Hanna’s

years of experience as a manufacturer of analytical instruments. It has the advanced optical

system based on a special tungsten lamp and a narrow band interference filter that allows most

accurate and repeatable readings. All instruments are factory calibrated and the electronic and

optical design minimizes the need of frequent calibration.

With the powerful CAL CHECKTM validation function, you are able to validate good performance

of your instrument at any time. The validation procedure is extremely user friendly. Just use the

exclusive HANNA ready-made, NIST traceable standards to verify the performance of the

instrument and recalibrate if necessary.

All instruments are splash waterproof and the lamp and filter units are protected from dust or dirt by

a transparent cup. This makes the instruments fulfill field applications. Display messages aid the

user in routine operation. The meter has an auto-shut off feature that will turn off the instrument

after 10 minutes of non use in

measurement mode

or after 1 hour if left in

calibration mode

The meter uses an exclusive positive-locking system to ensure that the cuvette is in the same

position every time it is placed into the measurement cell. It is designed to fit a cuvette with a

larger neck making it easier to add both sample and reagents. The cuvette is made from special

optical glass to obtain best results.

The HI 96710 meter measures both pH and chlorine (free and total) content in water and

wastewater in the following ranges:

pH 6.5 to 8.5 pH units

Free Chlorine 0.00 to 5.00 mg/L (ppm)

Total Chlorine 0.00 to 5.00 mg/L (ppm).

The method is an adaptation of the USEPA method 330.5 and Standard Method 4500-Cl G. For pH,

Phenol red method.

The reagents are in liquid and powder form depending on the parameter and they are supplied

in dropper bottles and packets. The amount of reagent is precisely dosed to ensure the maximum

repeatability.

degree Celsius

US Environmental Protection Agency

degree Fahrenheit

milligrams per liter. mg/L is equivalent to ppm (parts per million)

milliliter

millivolts

°C:

EPA:

°F:

mg/L:

mL:

mV:

SPECIFICATIONS

Range pH 6.5 to 8.5

Free Chlorine 0.00 to 5.00 mg/L

Total Chlorine 0.00 to 5.00 mg/L

Resolution 0.1 pH

0.01 mg/L under 3.50 mg/L Chlorine

0.10 mg/L above 3.50 mg/L Chlorine

Accuracy pH ±0.1 pH @ 25°C

Free Chlorine ±0.03 mg/L ±3% of reading @ 25°C

Total Chlorine ±0.03 mg/L ±3% of reading @ 25°C

Typical EMC Deviation ±0.1 pH

±0.01 mg/L Chlorine

Light Source Tungsten lamp

Light Detector Silicon Photocell with narrow band interference filter @ 525 nm

Method For pH: Phenol red method. The reaction with reagents causes a red

tint in the sample.

For Chlorine: Adaptation of the USEPA method and Standard Method

4500-Cl G. The reaction with reagents causes a pink 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.).

REQUIRED REAGENTS

Code Unit Description Quantity/test

HI93710-0 pH Phenol red 5 drops

HI93701-0 Free Chlorine DPD Powder Reagent 1 packet

HI93711-0 Total Chlorine DPD Powder Reagent 1 packet

Precision is how closely repeated

measurements agree with each other. Precision

is usually expressed as standard deviation (SD).

Accuracy is defined as the nearness of a test

result to the true value.

Although good precision suggests good

accuracy, precise results can be inaccurate.

The figure explains these definitions.

In a laboratory using a standard solution of

7.0 pH and a representative lot of reagent,

an operator obtained with a single instrument

a standard deviation of 0.1 pH units.

In a laboratory using a standard solution of 1.00 mg/L free and total chlorine and a representative

lot of reagent, an operator obtained with a single instrument a standard deviation of 0.02 mg/L.

PRECISION AND ACCURACY

PRINCIPLE OF OPERATION

Absorption of Light is a typical phenomenon of interaction between electromagnetic radiation and

matter. When a light beam crosses a substance, some of the radiation may be absorbed by

atoms, molecules or crystal lattices.

If pure absorption occurs, the fraction of light absorbed depends both on the optical path length

through the matter and on the physical-chemical characteristics of the substance according to the

Lambert-Beer Law:

-log I/Io = ελ c d

A = ελ c d

Where:

-log I/Io=Absorbance (A)

Io=intensity of incident light beam

I=intensity of light beam after absorption

ελ=molar extinction coefficient at wavelength λ

c=molar concentration of the substance

d=optical path through the substance

A microprocessor controlled special tungsten lamp emits radiation which is first optically

conditioned and beamed to the sample contained in the cuvette. The optical path is fixed by the

diameter of the cuvette. Then the light is spectrally filtered to a narrow spectral bandwidth, to

obtain a light beam of intensity Ioor I.

The photoelectric cell collects the radiation Ithat is not absorbed by the sample and converts

it into an electric current, producing a potential in the mV range.

The microprocessor uses this potential to convert the incoming value into the desired measuring

unit and to display it on the LCD.

The measurement process is carried out in two phases: first the meter is zeroed and then the

actual measurement is performed.

The cuvette has a very important role because it is an optical element and thus requires

particular attention. It is important that both, the measurement and the calibration (zeroing)

cuvettes, are optically identical to provide the same measurement conditions. Whenever possible

use the same cuvette for both. It is necessary that the surface of the cuvette is clean and not

scratched. This to avoid measurement interference due to unwanted reflection and absorption of

light. It is recommended not to touch the cuvette walls with hands.

Furthermore, in order to maintain the same conditions during the zeroing and the measuring

phases, it is necessary to close the cuvette to prevent any contamination.

Therefore, the concentration "c" can be calculated from the absorbance of the substance as the

other factors are known.

Photometric chemical analysis is based on the possibility to develop an absorbing compound

from a specific chemical reaction between sample and reagents. Given that the absorption of a

compound strictly depends on the wavelength of the incident light beam, a narrow spectral

bandwidth should be selected as well as a proper central wavelength to optimize measurements.

The optical system of Hanna's HI 96 series colorimeters is based on special subminiature

tungsten lamps and narrow-band interference filters to guarantee both high performance and

reliable results.

HI 96 series block diagram (optical layout)

1) RANGE/GLP/ key

2) CAL CHECK key

3) ZERO/CFM key

4) READ/ /TIMER key

5) ON/OFF key

6) Liquid Crystal Display (LCD)

7) Cuvette alignment indicator

8) Cuvette holder

KEYPAD DESCRIPTION

•ON/OFF: to turn the meter on and off.

•ZERO/CFM: this is a bi-functional key. Just press to zero the meter prior to measurement,

or to confirm edited values. In

calibration mode

press to confirm factory calibration restore.

•READ/ /TIMER: this is a multi-functional 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.

•CAL CHECK: this is a bi-functional key. Just press to perform the validation of the meter, or

press and hold for three seconds to enter

calibration mode

• RANGE/GLP/: this is a multi-functional key. Just press to change the parameter. Press and

hold for three seconds to enter

GLP mode

. In

calibration mode

press to edit the date and time.

OPERATING MODES

•

Measurement mode:

default operation mode, enables both validation and measurement.

•

Calibration mode:

may be entered

by keeping CAL CHECK pressed for three seconds (the

“CAL” tag appears), it enables calibration of the instrument.

•

GLP mode:

may be entered by keeping RANGE/GLP/pressed for three seconds (“GLP”

appears), it enables consulting of user calibration date or restore factory calibration.

FUNCTIONAL DESCRIPTION

INSTRUMENT DESCRIPTION

DISPLAY ELEMENTS 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 charge state 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

Under range: A blinking “0.00” 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.

No Light: The instrument cannot adjust the light level. Please

check that the sample does not contain any debris.

Inverted cuvettes: The sample and the zero cuvette are inverted.

Zero: A zero reading was not taken. Follow the instructions of the

measurement procedure for zeroing the meter.

b) on sample reading

ERRORS AND WARNINGS

The instrument shows clear messages when erroneous condition appears. Messages are also displayed

when the obtained values are outside expected range. The beeper is playing a beep on errors.

a) on zero reading

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.

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