Hanna Instruments HI764 User manual

Nitrite Ultra Low Range
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 [email protected].
Preliminary examination:
Please examine this product carefully. Make sure that the instrument is not damaged. If
any damage occured during shipment, please notify your Dealer.
Each HI 764 meter is supplied complete with:
• Two Sample Cuvettes and Caps
• Six powder reagents for Nitrite Ultra Low Range
• 1 x 1.5V AAA Battery
• Instruction Manual
HI 764
Technical specifications:
Range 0 to 200 ppb
Resolution 1 ppb
Accuracy ±10 ppb ±4% of reading @ 25°C
Typical EMC Dev. ±10 ppb
Light Source Light Emitting Diode @ 525 nm
Light Detector Silicon Photocell
Method Adaptation of the EPA Diazotization method 354.1.
The reaction between nitrite and the reagent causes a
pink tint in the sample.
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 2 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:
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
an over range condition. The concentration of the sample is beyond
the programmed 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.
1. Cuvette cap.
2. Cuvette with cap.
3. Cuvette holder.
4. Liquid Crystal Display.
5. Button
For more details about spare parts and accessories
see “Accessories”.
www.hannainst.com

• Turn the meter on by pressing the button.
After all the segments are displayed, “C.1”,
“Add” appears 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, open it and add the
content of one packet of HI 764-25
reagent. Replace the cap and shake gently
for about 15 seconds. Replace the cuvette
into the meter.
• Press and hold the button until the timer is
displayed on the LCD.
• The instrument directly displays the
concentration of nitrogen-nitrite (NO2¯-N)
in ppb. The meter automatically turns off
after 2 minutes.
• To convert the NO2¯-N concentration to the
nitrite ion concentration (NO2¯), multiply
the reading by factor of 3.29.
10 mL
• It is important that the sample does not contain any debris.
• Whenever the cuvette is placed into the measurement cell, it must by dry
outside, and completely free of fingerprints, oil or dirt. Wipe it throughly 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 such bubbles by swirling or by gently tapping
the cuvette.
• Do not let the reacted sample stand for too long after reagent is added, or
accuracy will be lost.
• After the reading it is important to immediately discard the sample, otherwise
the glass might become permanently stained.
REAGENT SETS
HI 764-25 Reagents for 25 Nitrite Ultra Low Range tests
OTHER ACCESSORIES
HI 740028 1.5V AAA batteries (4 pcs)
HI 731318 Tissue for wiping cuvettes (4 pcs)
HI 731321 Glass cuvettes (4 pcs)
HI 731353 Caps for cuvettes (4 pcs)
HI 93703-50 Cuvettes cleaning solution (230 mL).
Recommendations for Users
Before using these 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 equipments, 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 damages 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.
For additional information, contact your
dealer or the nearest
Hanna Customer Service Center.
To find the Hanna Office in your area,
visit our web site
www.hannainst.com
Hanna Instruments reserves the right to modify the design, construction and
appearance of its products without advance notice.
Battery management
To save the battery, the instrument shuts down after 2 minutes of non-use.
One fresh battery lasts for a minimum of 5000 measurements, depending on the light level.
When the battery capacity is under 10 % “bAt” appears on the LCD at start-up.
If the battery is empty and accurate measurements can’t be taken any more, the instrument
shows “bAd” then ”bAt” each for 1 second and turns off.
To restart the instrument, the battery must be replaced with a fresh one.
To replace the instrument’s battery, follow the steps:
• 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 fresh one.
• Insert the battery cover and replace the screw with a screwdriver.
IST764 06/10
Measurement procedure: Accessories:Tips for an accurate measurement