Hanna Instruments HI 727 User Manual

HI 727

Color of Water

www.hannainst.com

Dear Customer,
Thank you for choosing a Hanna Instruments Product.

Please read this instruction manual carefully before using the instrument. If you need
additional technical information, do not hesitate to e-mail us at [e-mail]
or view our worldwide contact list at www.hannainst.com.

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 727 meter is supplied complete with:

• Two Sample Cuvettes and Caps

• 1 x 1.5V AAA Battery

• Instruction Manual

For more details about spare parts and accessories
see “Accessories”.

Technical specifications:

Range 0 to 500 PCU

Resolution 5 PCU

Accuracy ±10 PCU ±5% of reading @ 25 °C / 77 °F

Light Source Light Emitting Diode @ 470 nm

Light Detector Silicon Photocell

Method Adaptation of the Standard Methods for the Examination

of Water and Wastewater 21Th edition, Colorimetric
Platinum Cobalt method.

Environment 0 to 50 °C (32 to 122 °F);

max 95% RH non-condensing

Battery Type 1 x 1.5V AAA

Auto-Shut off After 10 minutes of non-use

Dimensions 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)

Weight 64 g (2.25 oz.)

Functional description:

1. Cuvette cap.

2. Cuvette with cap.

3. Cuvette holder.

4. Liquid Crystal Display.

5. Button.

Errors and warnings:

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” 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.

Measurement procedure: Accessories:Tips for an accurate measurement

• 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.

• Fill one cuvette up to the 10 mL mark with
deionized water and replace the cap. This is
the blank.

• Place the blank cuvette 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.

• Fill second cuvette up to the 10 mL mark with
unfiltered sample and replace the cap. This is
the apparent color.

• Insert the apparent color cuvette into the meter
and close the meter’s cap.

• Press the button and the meter directly displays
the value of apparent color.

• Remove the cuvette and press the button twice
to restart the meter.

• Filter 50 mL of sample through a 0.45 µm
membrane filter into a beaker.

• After measuring of apparent color rinse the
cuvette three times with filtered sample and
then fill it up to the 10 mL mark with the
filtered sample and replace the cap. This is
the true color.

• Follow the procedure above to re-zero the
meter using the blank cuvette.

• Insert the true color cuvette into the instrument.

• Press the button and the meter directly displays
concentration in color units of the true color on
the LCD.

• The meter automatically turns off after
10 minutes.

10 mL

10 mL

10 mL

• 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
HI 731318 or a lint-free cloth prior to insertion.

• Shaking the cuvette can generate bubbles, causing higher readings. To obtain
accurate measurements, remove 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.

Battery management

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.

REQUIRED ACCESSORIES

0.45 µm membrane filter for true color measurement.

OTHER ACCESSORIES
HI 727-11 Color of Water Certified Standard Kit
HI 731318 Cloth for wiping cuvettes (4 pcs.)
HI 731321 Glass cuvettes (4 pcs.)
HI 731225 Cuvette black cap for checker HC (4 pcs.)
HI 731353 Cuvette seal cap for checker HC (4 pcs.)
HI 740028 1.5V AAA batteries (4 pcs.)
HI 93703-50 Cuvette cleaning solution (230 mL)

Recommendations for Users

Before using this product, make sure that it is entirely suitable for your specific application and for the
environment in which it is used.
Operation of this instrument may cause unacceptable interferences to other electronic equipment, thus
requiring the operator to take all necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment may degrade the instrument’s EMC
performance.
To avoid damage or burns, do not put the instrument in microwave oven. For the safety of you and the
instrument do not use or store the instrument in hazardous environments.

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

appearance of its products without advance notice.

For additional information, contact your

dealer or the nearest

Hanna Customer Service Center.

To find a Hanna Office in your area,

visit our web site:

www.hannainst.com

IST727 03/13