Hanna Instruments HI774 Manuel utilisateur

Tips for an Accurate Measurement

•Ensure the sample does not contain any debris.

•Whenever the cuvette is placed into the checker, it must be

dry outside and free of fingerprints, oil and dirt.

•Wipe the cuvette thoroughly with HI731318 microfiber

cleaning cloth 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 too long after reagent

has been added, as accuracy will be affected.

•

Press and hold the ON/OFF button to turn the checker off.

Replace the battery cover, fasten and tighten the screw.

09/20

HI774

Marine Phosphate Ultra Low Range

INSTRUCTION MANUAL

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Preliminary Examination

Remove the Checker®HC handheld colorimeter and accessories from the packing

material and examine it carefully. If you require any further information, please

contact Hanna Instruments technical support team.

Each HI774 is delivered in a case with custom insert and is supplied with:

•Sample cuvette and cap (2 pcs.)

•Marine Phosphate Ultra Low Range reagent starter kit (reagents for 10 tests)

•1.5V AAA Alkaline battery (1 pc.)

•Instruction manual

Note: Save all packing material until you are sure that the Checker®HC

handheld colorimeter works correctly. Any damaged or defective item must

be returned in its original packing material with the supplied accessories.

General Description & Intended Use

HI774 Marine Phosphate Ultra Low Range handheld checker is designed to

accurately determine phosphate level in applications such as aquaculture and

drinking, agricultural and wastewaters.

HI774 features a single-button operation system and is easy to use.

The large LCD is easy to read and the auto shut-off feature assures the battery

will not be drained.

Specifications

Range 0.00 to 0.90 ppm

Resolution 0.01 ppm

Accuracy ±0.02 ppm ±5% of reading @ 25 °C (77 °F)

Light source Light Emitting Diode @ 525 nm

Light detector Silicon photocell

Method

Adaptation of Standard Methods for the Examination of

Water & Wastewater, 20th Edition, Ascorbic Acid Method.

The reaction between phosphate and the reagent causes a

blue tint in the sample.

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

Battery type 1.5V AAA Alkaline

Auto shut-off After 7 minutes of non-use and 2 minutes after reading

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

Weight 64 g (2.3 oz)

Functional Description & LCD Display

Cap

Cuvette with cap

Cuvette holder

LCD (Liquid Crystal Display)

ON/OFF button

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Measurement Procedure

•Press the ON/OFF button to turn the checker

on. All segments will be displayed for a few

seconds, followed by “Add”, “C.1” with “Press”

blinking.

•Fill the cuvette with 10 mL of unreacted sample

and replace the cap. Insert the cuvette into the

checker and close the cap.

•Press the ON/OFF button. When the display

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

checker is zeroed.

•Remove the cuvette, unscrew the cap and add

the content of one packet of HI774-0 Marine

Phosphate Ultra Low Range reagent. Replace

the cap and shake gently for about 2 minutes

until the powder is completely dissolved.

•Insert the cuvette into the checker and close the

cap. Press and hold the ON/OFF button. The

display will show the countdown prior to the

measurement. Alternatively, wait 3 minutes

and press the button.

•When the timer ends the checker will perform

the reading. The instrument displays the

phosphate concentration in ppm. The checker

automatically turns off 2 minutes after reading.

Sample cuvette and cap (2 pcs.)

•

1.5V AAA Alkaline battery (1 pc.)

•

Errors & Warnings

The checker shows clear warning messages when erroneous conditions appear and

when measured values are outside the expected range. The information below

provides an explanation of the errors and warnings, and the recommended action

to be taken.

Light High: There is an excess amount of ambient light

reaching the detector. 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 cuvettes are

inverted. Swap the cuvettes and repeat the measurement.

Under Range: A blinking “0.00” indicates that the sample

absorbs less light than the zero reference. Check the

measurement procedure and make sure to use the same cuvette

for reference (zero) and measurement.

Over Range: Maximum concentration value displayed blinking

indicates the measured value is outside the limits of the method.

Verify that the sample does not contain any debris. Dilute the

sample and repeat the measurement.

Battery Low: Battery level is too low for the checker to function

properly. Replace the battery with a new one.

Drained Battery: The battery is drained and must be replaced.

Replace the battery with a new one and restart the checker.

www. .com information@itm.com1.800.561.8187

Tips for an Accurate Measurement

•Ensure the sample does not contain any debris.

•Whenever the cuvette is placed into the checker, it must be

dry outside and free of fingerprints, oil and dirt.

•Wipe the cuvette thoroughly with HI731318 microfiber

cleaning cloth 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 too long after reagent

has been added, as accuracy will be affected.

• Discard the sample immediately after the reading has been

taken or the glass might become permanently stained.

Battery Replacement

To save the battery, the checker shuts down after 7 minutes of non-use and

2 minutes after reading.

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

drained, the instrument displays “bAd” then ”bAt”, and turns off.

To replace the battery, follow the next steps:

1. Press and hold the ON/OFF button to turn the checker off.

2. Turn the instrument upside down and use a screwdriver to unfasten the screw and

remove the battery cover.

3. Remove the old battery, replace it with a new 1.5V AAA battery, inserting the

negative end first.

4. Replace the battery cover, fasten and tighten the screw.

Accessories

Low Range

www. .com information@itm.com1.800.561.8187

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