Hanna Instruments HI 721 User Manual

HI 721

Iron High Range

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 721 meter is supplied complete with:

• Two Sample Cuvettes and Caps

• Six powder of Iron HR Reagent

• 1 x 1.5V AAA Battery

• Instruction Manual

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

Technical specifications:

Range 0.00 to 5.00 ppm

Resolution 0.01 ppm

Accuracy ±0.04 ppm ±2% of reading @ 25 °C / 77 °F

Light Source Light Emitting Diode @ 525 nm

Light Detector Silicon Photocell

Method Adaptation of the EPA Phenantroline method 315B,

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

Battery Type 1 x 1.5V AAA

Auto-Shut off After 3 minutes of non-use and 2 minutes after reading

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

Weight 64 g (2.25 oz.)

for natural and treated waters. The reaction between
iron and reagent causes an orange tint in the sample.

max 95% RH non-condensing

Functional description:

1. Dust cover.

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 “0.00” 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.

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 the cuvette with 10 mL of unreacted
sample and replace the cap. Place the 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.

• Remove the cuvette from the meter and
unscrew the cap. Add the content of one
packet of HI 721-25 reagent. Replace the
cap and shake gently for 2 minutes until
the powder is completely dissolved. Place
the cuvette back into the meter.

• Press and hold the button until the timer is
displayed on the LCD (the display will show
the countdown prior to the measurement) or,
alternatively, wait for 3 minutes and press the
button.

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 3 minutes of non-use and 2 minutes
after read.
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.

REAGENT SETS
HI 721-25 Reagents for 25 Iron High Range tests

OTHER ACCESSORIES
HI 721-11 Iron HR 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

• The instrument directly displays the
concentration of iron in ppm. The meter
automatically turns off after 2 minutes.

• 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.

IST721 03/13