HANNA INSTRUMENTS HI767 (01) PDF Document

To ensure an accurate measurement with the HANNA INSTRUMENTS HI767, follow these steps:

• 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.

To replace the battery in the HANNA INSTRUMENTS HI767, follow these 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.

The specifications for the HANNA INSTRUMENTS HI767 are detailed in the following table:

The available accessories for the HANNA INSTRUMENTS HI767 are:

Reagent Sets:

• HI767-25: Reagents for 25 Marine Nitrite Low Range tests

Other Accessories:

• HI767-11: Marine Nitrite Low Range certified standard kit
• HI731315: Glass cuvette and cap for Checker®HC colorimeters (2 pcs.)
• HI731318: Cloth for wiping cuvettes (4 pcs.)
• HI740028P: 1.5V AAA battery set (12 pcs.)
• HI93703-50: Cuvette cleaning solution, 230 mL

The HANNA INSTRUMENTS HI767 Marine Nitrite Low Range handheld checker is designed to accurately determine nitrite levels in saltwater aquariums and marine biology applications. It 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.

To perform the measurement procedure with the HANNA INSTRUMENTS HI767:

Step 1: 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.

Step 2: Fill the cuvette with 10 mL of unreacted sample and replace the cap. Insert the cuvette into the checker and close the cap.

Step 3: Press the ON/OFF button. When the display shows “Add”, “C.2” with “Press” blinking, the checker is zeroed.

Step 4: Remove the cuvette, unscrew the cap and add the content of one packet of H1767-0 Marine Nitrite Low Range reagent. Replace the cap and shake gently for about 15 seconds.

Step 5: 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 15 minutes and press the button. Note: Reaction times between 10 and 15 minutes are displayed in minutes and reaction times under 10 minutes are displayed in minutes and seconds.

Step 6: When the timer ends the checker will perform the reading. The instrument displays the nitrogen-nitrite (NO₂-N) concentration in ppb. To convert nitrogen-nitrite (NO₂-N) concentration to nitrite-ion concentration (NO₂), multiply the reading by 3.29. The checker automatically turns off 4 minutes after reading.

A “Light High” warning on the HANNA INSTRUMENTS HI767 indicates that there is an excess amount of ambient light reaching the detector. To resolve this, please check the preparation of the zero cuvette.

A “Light Low” warning on the HANNA INSTRUMENTS HI767 means there is not enough light to perform a measurement. Please check the preparation of the zero cuvette.

If the HANNA INSTRUMENTS HI767 displays “Inverted Cuvettes”, it means the sample and the zero cuvettes are inverted. Swap the cuvettes and repeat the measurement.

An “Under Range” indication, shown as a blinking “0”, on the HANNA INSTRUMENTS HI767 means 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.

If the HANNA INSTRUMENTS HI767 displays an “Over Range” value (maximum concentration value blinking), it 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.

A “Battery Low” message on the HANNA INSTRUMENTS HI767 indicates that the battery level is too low for the checker to function properly. You need to replace the battery with a new one.

A “Drained Battery” message on the HANNA INSTRUMENTS HI767 means the battery is drained and must be replaced. Replace the battery with a new one and restart the checker.

Before using the HANNA INSTRUMENTS HI767, make sure it is entirely suitable for your specific application and for the environment in which it is used. Any variation introduced by the user to the supplied equipment may degrade the checker’s performance. For your and the checker’s safety, do not use or store it in hazardous environments.