Hanna Instruments HI 96770C Manual de usuario

www.hannainst.com This Instrument is in

Compliance with the Directives

Instruction Manual

HI 96770C

Silica High Range

ISM

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].

This instrument is in compliance with directives.

Allrights arereserved. Reproductionin wholeor inpart isprohibited withoutthe writtenconsent ofthe copyrightowner,

HannaInstrumentsInc.,Woonsocket,RhodeIsland,02895,USA.

TABLE OF CONTENTS

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 96770 Ion Selective Meter is supplied complete with:

• Two Sample Cuvets and Caps

• Two CAL CHECK™ standard cuvets HI 96770-11 with Quality Certificate

• 9V Battery

• Scissors

• Tissues for wiping cuvets

• Instrument Quality Certificate

• Instruction Manual and Quick Reference Guide

• 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.

PRELIMINARY EXAMINATION

degree Celsius

US Environmental Protection Agency

degree Fahrenheit

Liquid Crystal Display

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

milliliter

millivolts

°C:

EPA:

°F:

LCD:

mg/L:

mL:

mV:

The HI 96770 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 Light Emitting Diode (LED) 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 CHECK™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.

The instrument is splash waterproof and the LED 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 measurementmodeor after 1 hour if left in calibrationmode.

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

every time it is placed into the measurement cell. It is designed to fit a cuvet with a larger neck

making it easier to add both sample and reagents. The cuvet is made from special optical glass to

obtain best results.

The HI 96770 meter measures the molybdate reactive silica (SiO2) content in water samples in the 0

to 200 mg/L (ppm) range. The method is an adaption of the USEPA METHOD 370.1 for drinking,

surface and saline waters, domestic and industrial wastes and Standard Method 4500-SiO2C.

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

to ensure the maximum repeatability.

GENERAL DESCRIPTION

ABBREVIATIONS

Range 0 to 200 mg/L

Resolution 1 mg/L

Precision ±5 mg/L @ 100 mg/L

Typical EMC Deviation ±1 mg/L

Light Source Light Emitting Diode

Light Detector Silicon Photocell with narrow band interference filter @ 466 nm.

Method Adaptation of the USEPA METHOD 370.1 for to drinking, surface and

saline waters, domestic and industrial wastes and Standard Method

4500-SiO2C. The reaction between silica and the reagents causes a

yellow 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 measurementmode;

after 1 hour of non-use in calibration mode;

with last reading reminder.

Dimensions 192 x 102 x 67 mm (7.6 x 4 x 2.6")

Weight 290 g (10 oz.).

REQUIRED REAGENTS

Code Description Quantity/test

HI 96770A-0 Silica HR Reagent A 1 packet

HI 96770B-0 Silica HR Reagent B 1 packet

HI 96770C-0 Silica HR Reagent C 1 packet

PrecisionPrecision

Precision is how closely repeated measurements

agree with each other. Precision is usually expressed

as standard deviation (SD).

AccuracyAccuracy

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 100 mg/L silica and a representative lot

of reagent, an operator obtained with a single

instrument a standard deviation of 5 mg/L.

SPECIFICATIONS

PRECISION AND ACCURACY

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 96770 colorimeter is based on a Light Emitting Diode (LED)

combined with a narrow-band interference filter to guarantee both high performance and reliable

results.

HI 96770 block diagram (optical layout)

PRINCIPLE OF OPERATION

1) GLP/

key

2) CAL CHECK key

3) ZERO/CFM key

4) READ /TIMER key

5) ON/OFF key

6) Liquid Cristal Display (LCD)

7) Cuvet alignment indicator

8) Cuvet holder

A microprocessor controlled LED emits radiation which is first optically conditioned and beamed to the

sample contained in the cuvet. The optical path is fixed by the diameter of the cuvet. 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 cuvet 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) cuvets, are optically

identical to provide the same measurement conditions. Whenever possible use the same cuvet for

both. It is necessary that the surface of the cuvet 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

cuvet walls with hands.

Furthermore, 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.

INSTRUMENT DESCRIPTION

FUNCTIONAL DESCRIPTION

KEYPAD DESCRIPTION

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

•ZERO/CFM: to zero the meter prior to measurement, to confirm edited values or to confirm

factory calibration restore.

•READ /TIMER: this is a multi-functional key. In measurementmode, press to make a measurement,

or press and hold for three seconds to start a pre-programmed countdown.

In GLPmodepress 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 calibrationmode.

•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) Instrument status indicator appears during different phases of zero or reading measurement

2) Icons displayed in this area are warning or action icons, signaling next operation

3) The battery icon shows the charging level of the battery

4) The hourglass appears when the instrument is performing an internal check up

5) CAL: appears when the instrument operates in the calibrationmode

6) The month, day and date icons appear when a date is displayed

7) The chronometer appears when the reaction timer is running

8) Four digit main display

9) Measuring units

10) Four digit secondary display

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 cuvet.

Light Low: There is not enough light to perform a measurement.

Please check the preparation of the zero cuvet.

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

that the samples does not contain any debris.

Inverted cuvets: The sample and the zero cuvet 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

Under range: A blinking “0” indicates that the silica content in the

sample is less than 0 mg/L.

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 out of range.

Standard High: The standard reading is out of range.

Cap error: the cuvet is not inserted correctly and an excess ambient

light is reaching the detector. If the cover is properly installed, then

contact your dealer or the nearest Hanna Customer Service Center.

d) other errors and warnings

Battery low: The battery voltage is getting low and the battery

needs to be replaced.

Dead battery: This indicates that the battery is dead and must be

replaced. Once this indication is displayed, the meter will lock up.

Change the battery and restart the meter.

Tabla de contenidos

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