1. Introduction
The WLR Industries HI764 Hanna Ultra Low Range Nitrite Checker HC is a compact and portable instrument designed for precise measurement of ultra-low nitrite levels in water samples. This device is an essential tool for applications such as aquaculture, environmental monitoring, and water treatment, providing accurate and reliable readings to help maintain optimal water quality conditions. Its user-friendly interface ensures straightforward operation for both professionals and hobbyists.
2. Safety Information
Please read this manual thoroughly before operating the HI764 Nitrite Checker. Failure to follow instructions may result in inaccurate readings or damage to the device. Always handle reagents with care and dispose of them according to local regulations. Keep the device and reagents out of reach of children.
- Do not immerse the meter in water.
- Use only specified reagents for accurate results.
- Ensure cuvettes are clean and free from scratches.
- Avoid direct contact with reagents. In case of contact, rinse thoroughly with water.
3. Package Contents
The HI764 Nitrite Checker package includes the following items:
- HI764 Nitrite Checker HC Meter
- Two Sample Cuvettes with Caps
- Reagent Starter Kit (sufficient for initial tests)
- 1.5V AAA Battery
- Instruction Manual and Quick Start Guide
Figure 3.1: Complete HI764 Nitrite Checker kit including the meter, cuvettes, reagents, and a protective case.
Figure 3.2: HI764 Nitrite Checker with two sample cuvettes and individual reagent packets.
4. Product Overview
The HI764 Nitrite Checker HC is designed for accurate and easy measurement of ultra-low range nitrite. Key features include:
- Ultra-Low Range Measurement: Capable of measuring nitrite levels from 0 to 200.0 µg/L (ppb).
- Compact and Portable: Designed for on-the-go testing in various environments.
- User-Friendly Operation: Simple button interface for easy navigation and measurement.
- Accuracy: Utilizes ultraviolet radiation for precise nitrite detection.
Figure 4.1: Front view of the HI764 Nitrite Checker HC, highlighting its display and single operational button.
5. Setup
5.1 Battery Installation
- Locate the battery compartment cover on the back of the meter.
- Remove the cover by sliding or unscrewing it.
- Insert one 1.5V AAA battery, ensuring correct polarity (+/-).
- Replace the battery compartment cover securely.
5.2 Initial Preparation
- Ensure all cuvettes are clean and dry before use. Rinse them with deionized water and wipe dry with a lint-free cloth.
- Avoid touching the glass surface of the cuvettes to prevent fingerprints, which can affect readings.
Figure 5.1: Clean sample cuvettes, essential for accurate measurements.
6. Operating Instructions
Follow these steps for accurate nitrite measurement:
- Power On: Press the button on the front of the meter to turn it on. The display will show "Add C1".
- Prepare Blank Sample (C1): Fill one cuvette with 10 mL of unreacted water sample (the water you want to test, without any reagents added). Cap the cuvette.
- Insert Blank Sample: Insert the C1 cuvette into the meter, ensuring the cap is fully seated. Close the meter's lid.
- Zero the Meter: Press the button. The display will show "Add C2" when the zeroing process is complete.
- Prepare Reacted Sample (C2): Remove the C1 cuvette. Take a second clean cuvette and fill it with 10 mL of the same water sample. Add the contents of one HI764 Nitrite Reagent packet to this cuvette. Cap the cuvette and shake gently for 15 seconds to mix.
- Reaction Time: Allow the reacted sample to stand for the specified reaction time (refer to the reagent packet for exact timing, typically a few minutes). A color change will indicate the presence of nitrite.
- Insert Reacted Sample: After the reaction time, insert the C2 cuvette into the meter. Close the meter's lid.
- Read Measurement: Press the button. The meter will display the nitrite concentration in µg/L (ppb).
- Power Off: The meter will automatically shut off after a period of inactivity, or you can press and hold the button to turn it off manually.
7. Maintenance
7.1 Cleaning
- Wipe the meter's exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Clean cuvettes thoroughly after each use with deionized water. Use a cuvette cleaning solution if necessary to remove stubborn residues.
- Ensure the optical path of the meter (where the cuvette sits) is clean and free of dust or debris.
7.2 Storage
- Store the HI764 Nitrite Checker in a cool, dry place away from direct sunlight.
- If storing for extended periods, remove the battery to prevent leakage.
- Keep reagents sealed and stored according to their specific instructions.
8. Troubleshooting
If you encounter issues with your HI764 Nitrite Checker, consider the following:
- Inaccurate Readings:
- Ensure cuvettes are clean and free of scratches or fingerprints.
- Verify that the correct reagents are used and are not expired.
- Check for proper mixing and reaction time.
- Ensure the sample volume is exactly 10 mL.
- Meter Not Powering On:
- Check if the battery is correctly installed and has sufficient charge. Replace if necessary.
- Error Messages: Refer to the detailed instruction manual provided with the device for specific error code interpretations and solutions.
9. Specifications
| Parameter | Value |
|---|---|
| Model Number | HI764 |
| Measurement Range | 0 to 200.0 µg/L (ppb) |
| Power Source | Battery Powered (1.5V AAA) |
| Color | Green |
| Min. Operating Voltage | 1.5 Volts (DC) |
| Upper Temperature Rating | 50 Degrees Celsius |
| Package Dimensions | 7.6 x 4.96 x 2.6 inches |
| Item Weight | 11.36 ounces |
10. Warranty and Support
WLR Industries provides a limited warranty for the HI764 Nitrite Checker HC against defects in materials and workmanship. For specific warranty terms, duration, and to access customer support, please refer to the warranty card included in your product packaging or visit the official WLR Industries website. For technical assistance or inquiries regarding product operation, please contact WLR Industries customer service.
