Hanna Instruments HI 720 Manual de usuario

HI720

Calcium Hardness

INSTRUCTION MANUAL

HI720

Before using Hanna Instruments products, make sure that they are entirely suitable for

your specific application and for the environment in which they are used. Operation of

these instruments may cause unacceptable interferences to other electronic equipment, thus

requiring the operator to take all necessary steps to correct such interferences. Any variation

introduced by the user to the supplied equipment may degrade the instrument’s EMC

performance. To avoid damages or burns, do not put the instrument in microwave oven. For

yours and the instrument safety do not use or store the instrument in hazardous environments.

Recommendations for Users

Accessories

Reagent Sets

HI720-25 Reagents for 50 Calcium Hardness Tests

Other Accessories

HI720-11 Calcium Hardness Certified Standard Kit

HI731225 Cuvette Black Cap for Checker®HC Colorimeters (4 pcs.)

HI731318 Cloth for wiping cuvettes (4 pcs.)

HI731321 Glass Cuvettes and Seal Cap for Checker®HC Colorimeters (4 pcs.)

HI731353 Cuvette Seal Cap for Checker®HC Colorimeters (4 pcs.)

HI740028P 1.5V AAA batteries (12 pcs.)

HI93703-50 Cuvette cleaning solution (230 mL)

IST720 05/18

HI720 is warranted for a period of one year after date of purchase against defects in

workmanship and materials when used for their intended purpose and maintained according

to instructions. This warranty is limited to repair or replacement free of charge. Damage due

to accidents, misuse, tampering or lack of prescribed maintenance is not covered. If service

is required, contact your local Hanna Instruments Office. If under warranty, report the model

number, date of purchase, serial number and the nature of the problem. If the repair is not

covered by the warranty, you will be notified of the charges incurred. If the instrument is to

be returned to Hanna Instruments, first obtain a Return Goods Authorization number from the

Technical Service department and then send it with shipping costs prepaid. When shipping any

instrument, make sure it is properly packed for complete protection.

Warranty

• It is important that the sample does not contain any debris.

• Whenever the cuvette is placed into the measurement cell, it

must be dry outside, and completely free of fingerprints, oil and

dirt. Wipe it thoroughly with HI731318 or a lint-free cloth prior

to insertion.

• Shaking the cuvette can generate bubbles, causing higher

readings. To obtain accurate measurements, remove such

bubbles by swirling or by gently tapping the cuvette.

• Do not let the reacted sample stand for too long after reagent

is added, as accuracy will be affected.

• After the reading it is important to immediately discard the

sample, otherwise the glass might become permanently stained.

Tips for an Accurate Measurement

To save the battery, the instrument shuts down after 10 minutes of non-use.

One fresh battery lasts for a minimum of 5000 measurements. When the battery is dead the

instrument will display “bAd” then ”bAt” for 1 second and then turns off.

To restart the instrument, the battery must be replaced with a new one.

To replace the instrument’s battery:

• Turn the instrument off by holding the button until the meter shuts off.

• Turn the instrument upside down and remove the battery cover with a screwdriver.

• Remove the battery from its location and replace it with a new one, inserting the negative

end first.

• Insert the battery cover and replace the screw with a screwdriver.

Battery Management

• Turn the meter on by pressing the button. All

segments will be displayed. When the display

shows “Add”, “C.1” with “Press” blinking, the

meter is ready.

• Rinse a graduated beaker several times with

unreacted sample, before filling it to the 50

mL mark with sample.

• Add 0.5 mL of HI720A-0 reagent, swirl to mix.

• Add 0.5 mL of HI720B-0 reagent, swirl to mix.

Use this solution to rinse 2 cuvettes before

filling them both up to the 10 mL mark.

• Add 1 drop of HI720C-0 reagent to one cuvette

(#1), replace the cap and invert the cuvette

several times to mix. This is the blank.

• Place the blank (#1) into the meter and close

the meter’s cap.

•Press the button. When the display shows

“Add”, “C.2” with “Press” blinking the meter

is zeroed.

• Remove the cuvette.

• Insert the second cuvette (#2) into the meter

and press the button.

• The meter directly displays the concentration of

calcium hardness (CaCO3) in ppm. The meter

automatically turns off after 10 minutes.

Thank You

Thank you for choosing a Hanna Instruments product. Please read this instruction

manual carefully before using the instrument.

For more information about Hanna Instruments and our products, visit

www.hannainst.com.

For technical support, contact your local Hanna Instruments Office or e-mail us at

[email protected].

Find your local Hanna Instruments Office on www.hannainst.com.

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

any damage occurred during shipment, please contact your local Hanna Instruments Office.

Each HI720 meter is supplied complete with:

• Sample Cuvettes and Caps (2 pcs.)

• Reagents for 50 tests

• 100 mL Plastic Beaker (1 pc.)

• 1 mL Syringes with Tips (2 pcs.)

• 1.5V AAA Battery (1 pc.)

• Instruction Manual and Quick Reference Guide

Preliminary Examination

Range 0.00 to 2.70 ppm

Resolution 0.01 ppm

Accuracy ±0.20 ppm ±5% of reading @ 25 °C / 77 °F

Light Source Light Emitting Diode @525 nm

Light Detector Silicon Photocell

Method

Adaptation of the Standard Methods for the Examination of Water and

Wastewater, 18th edition, Calmagite method. The reaction between

calcium and reagents causes a reddish-violet tint in the sample.

Environment 0 to 50 °C (32 to 122 °F); max 95% RH non-condesing

Battery Type 1.5V AAA (1 pc.)

Auto-Shut off After 10 minutes of non-use

Dimensions 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)

Weight 52 g (1.84 oz.)

Specifications

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.

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

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.

Over Range: A flashing value of the maximum concentration indicates

the reading is over range. Dilute the sample and re-run the test.

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.

Cover

Cuvette with cap

Cuvette holder

LCD Liquid Crystal Display

Operation Button

Functional Description

Errors and Warnings

Measurement Procedure

Hanna Instruments reserves the right to modify the design, construction or appearance of

its products without advance notice.

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