Hanna Instruments 96728 Manual de usuario

Instruction Manual

HI 96728

Nitrate ISM

TABLE OF CONTENTS

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

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

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

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

PRECISION AND ACCURACY .................................................................................................. 5

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

FUNCTIONAL DESCRIPTION .................................................................................................. 7

ERRORS AND WARNINGS .................................................................................................... 9

GENERAL TIPS FOR AN ACCURATE MEASUREMENT ............................................................. 11

STARTUP ........................................................................................................................... 12

MEASUREMENT PROCEDURE ............................................................................................. 12

VALIDATION PROCEDURE ................................................................................................... 15

CALIBRATION PROCEDURE ................................................................................................. 17

GLP ................................................................................................................................... 20

BATTERY MANAGEMENT .................................................................................................... 21

BATTERY REPLACEMENT .................................................................................................... 22

ACCESSORIES ..................................................................................................................... 22

WARRANTY........................................................................................................................ 23

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].

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 96728 Ion Selective Meter is supplied complete with:

• Two Sample Cuvettes and Caps

• 9V Battery

• Instrument quality certificate

• 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.

GENERAL DESCRIPTION

ABBREVIATIONS

The HI 96728 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 96728 meter measures the nitrate-nitrogen content in water samples in the 0.0 to 30.0 mg/

L(ppm) range. The method is an adaptation of the cadmium reduction method.

The reagent is in powder form and is supplied in packets. The amount of reagent is precisely

dosed to ensure the maximum repeatability.

degree Celsius

degree Fahrenheit

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

milliliter

millivolts

°C:

°F:

mg/L:

mL:

mV:

SPECIFICATIONS

PRECISION AND ACCURACY

Range 0.0 to 30.0 mg/L

Resolution 0.1 mg/L

Accuracy ±0.5 mg/L ±10% of reading@ 25°C

Typical EMC Deviation ±0.1 mg/L

Light Source Tungsten lamp

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

Method Adaptation of the cadmium reduction method. The reaction between nitrate-

nitrogen and the reagent causes an amber tint in the sample.

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 Description Quantity/test

HI93728-0 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

10.0 mg/L nitrate and a representative lot of

reagent, an operator obtained with a single

instrument a standard deviation of 0.3 mg/L.

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= ελc d

A = ελc 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

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 colorimeter is based on special tungsten lamp and narrow-band

interference filters to guarantee both high performance and reliable results.

HI 96 block diagram (optical layout)

1) 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

FUNCTIONAL DESCRIPTION

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.

INSTRUMENT DESCRIPTION

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 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

•GLP/: this is a bi-functional key. Just press 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 pressing GLP/ (“GLP” appears), it enables consulting of

user calibration date or restore factory calibration.

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

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.

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

Under Range: A blinking “0.0” 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.

c) during calibration procedure

Standard Low: The standard reading is less than expected.

Standard High: The standard reading is higher than expected.

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.

d) other errors and warnings

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.

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