Hanna Instruments HI781 - Marine Nitrate Low Range Manual

Hanna Instruments HI781 - Marine Nitrate Low Range Manual

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Hanna Instruments HI781 - Marine Nitrate Low Range Manual

Introduction

Please read this instruction manual carefully before using the instrument.
For more information about Hanna Instruments and our products, visit www.hannainst.com.
For technical support, contact your local Hanna Instruments Office or e-mail us at tech@hannainst.com
Find your local Hanna Instruments Office at www.hannainst.com

PRELIMINARY EXAMINATION

Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occured during shipment, please contact your local Hanna Instruments Office.
Each HI96738 Ion Selective Meter is supplied complete with:

  • Sample cuvette and cap (2 pcs.)
  • Marine Nitrate Low Range reagent starter kit (reagents for 25 tests)
  • Filter paper (25 pcs.)
  • Filter holder (1 pc.)
  • Mixing vial and cap (1 pc.)
  • 5 mL syringe with tip (1 pc.)
  • 10 mL syringe (1 pc.)
  • 1.5V AAA Alkaline battery (1 pc.)
  • Instruction manual

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

HI781 Marine Nitrate Low Range handheld checker is designed to accurately determine nitrate levels in aquariums and marine biology applications.
HI781 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 life will not be drained.

SPECIFICATIONS

Range 0.00 to 2.00 mg/L
Resolution 0.01 mg/L
Accuracy @25°C (77°F) ±0.10 mg/L ±5% of reading
Light source Tungsten Lamp
Light Detector Silicon Photocell with narrow band interference filter @575 nm
Method Adaptation of the Chlorophenol Red method.
The reaction between chlorine dioxide and reagents causes a colorless to purple tint in the sample.
Environment 0 to 50°C (32 to 122°F); max 95% RH non-condensing
Battery Type 9V (1 pc.)
Auto-Shut off After 10' of non-use in measurement mode; after 1 hour of non-use in calibration mode; with last reading reminder
Dimensions 192 x 104 x 69 mm (7.6 x 4.1 x 2.7")
Weight 320 g (11.3 oz.)

Functional Description & LCD Display

Functional Description & LCD Display

Prepare the Filter Holder Assembly

Unscrew the two halves of the reusable filter holder and carefully place one paper filter on the lower piece (the lower piece has no threads on the outlet). Ensure the filter paper is on top of the clear colorless gasket in the filter holder. Thread the upper piece over the lower piece and tighten securely. Ensure that the paper filter is not overlapping the threads. The filter holder assembly is now ready for use.

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.

  • Using the 10 mL syringe, measure exactly 7 mL of sample into the large mixing vial.

  • Using the 5 mL syringe, add exactly 4 mL of HI781A-0 reagent into the large mixing vial.
  • Add the content of one packet of HI781B-0 reagent into the large mixing vial. Replace the cap and shake vigorously for 1 minute.
  • Remove the plunger from the 10 mL syringe. Attach the syringe to the filter holder assembly using the threaded connection.

  • Remove the cap from the mixing vial. Hold the syringe and filter holder assembly over a cuvette. Carefully pour the contents of the mixing vial into the back of the syringe.
  • Very slowly push the plunger into the 10 mL syringe until the 10 mL cuvette has been filled up to the 10 mL mark 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 HI781C-0 reagent. Replace the cap and shake vigorously for 2 minutes.

  • Insert the cuvette into the checker.
  • Press and hold the ON/OFF button. The display will show the countdown prior to the measurement. Alternatively, wait 8 minutes and press the button.

  • When the timer ends the checker will perform the reading. The instrument displays the concentration of nitrate in ppm of NO – 3 checker turns off 4 minutes after reading.

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.

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 20 minutes of non-use and 4 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

Reagent Sets
HI781-25 Reagents for 25 Marine Nitrate Low Range tests
Other Accessories
HI781-11 Marine Nitrate Low Range certified standard kit
HI731225 Cuvette black cap for Checker ® HC colorimeters (4 pcs.)
HI731318 Cloth for wiping cuvettes (4 pcs.)
HI731321 Glass cuvette and seal cap for Checker ® HC colorimeters (4 pcs.)
HI731353 Cuvette seal cap for Checker ® HC colorimeters (4 pcs.)
HI740028P 1.5V AAA battery set (12 pcs.)
HI740226 5 mL graduated syringe (1 pc.)
HI740228 Filter disc (25 pcs.)
HI740270 10 mL syringe with Luer Lock (1 pc.)
HI740271 Filter holder with Luer Lock (1 pc.)
HI740144P Plastic tip for 5 mL syringe (10 pcs.)
HI93703-50 Cuvette cleaning solution, 230 mL

Documents / Resources

References

Download manual

Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.

Download Hanna Instruments HI781 - Marine Nitrate Low Range Manual

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