The device is a Turbidity Meter, specifically the "Turbidez Max" model from AKSO, designed for measuring water quality. It is a portable instrument with a digital display and dynamic buttons for navigation and operation.
Function Description
The Turbidez Max is used to measure turbidity in water samples. It offers both instant and continuous measurement modes. The instant mode provides a single final result, while the continuous mode displays variations in readings due to the movement of suspended solids. The device stores up to 1000 records internally, with the last 50 directly viewable on the meter. For older records, data can be downloaded to a computer using the AKSO_Max_Logger program via a USB-C connection. The instrument also features adjustable settings for user ID, sample ID, backlight intensity, date, time, and language. It supports English, Spanish, and Portuguese.
Important Technical Specifications
- Measuring Range: 0 to 1000 NTU (Nephelometric Turbidity Units)
- Resolution:
- 0.01 NTU (for 0.00 to 9.99 NTU)
- 0.1 NTU (for 10.0 to 99.9 NTU)
- 1 NTU (for 100 to 1000 NTU)
- Accuracy: ± (0.2 NTU + 5% reading)
- Light Source: LED emitter
- Adjustment Points: 7 points (0 / 5 / 20 / 100 / 200 / 500 / 800 NTU)
- Measurement Cell: Glass cuvette (Ø24.9 mm)
- Sample Volume: 15 mL
- Internal Memory: 1000 records groups
- Power Supply: 9Vdc (1 x 9V battery) or AC/DC adapter (5Vdc – 500mA). Important Note: The battery and AC/DC adapter should NEVER be used simultaneously to avoid irreversible damage.
- Operating Temperature: 0 to 50 °C
- Operation Humidity: 10 to 90 %UR (non-condensing)
- Dimensions (WxHxD): 95 x 80 x 190 mm
- Weight: 300g (with battery)
- Additional Information:
- Adjustable backlight
- Battery charge level indication
- Date and time display
- Adjustable auto power-off (OFF, 30s, 45s, 60s, 90s, 120s options)
- PC communication (USB type C)
- "Always on display" mode (when powered via USB)
- Measurement method based on EPA 180.1
Usage Features
Turning On/Off:
- To turn on, briefly press the On-Off button.
- To turn off, from the home menu, hold the On-Off button until "Turn off device?" appears, then press "Yes" to confirm.
Measurement Procedure:
- Collect the water sample.
- Fill a 15mL measuring cuvette to the indicated line.
- Close the cuvette lid securely to prevent leaks.
- Gently shake the sample to homogenize.
- Handling the cuvette by the lid, dry and clean it thoroughly with the provided flannel to remove moisture, dirt, or grease.
- Turn on the instrument.
- Select the desired measurement mode: "Turbidity" (instant) or "Continuous turbidity."
- Insert the cuvette into the measurement compartment, aligning its indication with the instrument's arrow.
- Carefully close the measurement lid.
- Press the "Meas." button and wait for the reading.
- View the turbidity measurement on the display.
- To save the reading, press the "Save" button, then "Yes."
- After measurement, discard the sample and wash the cuvette with distilled (or deionized) water to prevent residue buildup or staining.
Adjustment (Calibration):
- The device can be adjusted at 7 points: 0NTU, 5NTU, 20NTU, 100NTU, 200NTU, 500NTU, and 800NTU.
- Important: Adjustment should only be performed when there is evidence of significant deviations exceeding the instrument's accuracy.
- Requires stable standard solutions with reliable values. Using unreliable standards is the user's responsibility.
- To access adjustment: Turn on the instrument, navigate to "Configs" using the ▲/▼ buttons, press "Enter." Then navigate to "Ajuste" (Adjust), press "Enter." Select "Turbidez" (Turbidity), press "Enter." Select "Ajustar" (Adjust), press "Enter."
- Follow on-screen prompts to insert standard solutions (starting with 0.00NTU) and press "Medir" (Measure) for each point.
- Factory default adjustment values can be restored by selecting "Padrão fabrica" (Factory standard) in the "Ajuste" menu.
Internal Memory:
- Stores up to 1000 records.
- The last 50 records can be viewed directly on the meter.
- To view records: Turn on the instrument, navigate to "Registros" (Records) using ▲/▼, press "Enter." Then navigate to "Ver registros" (View records), press "Enter." Use ▲/▼ to browse the last 50 records. Press "Voltar" (Back) to return.
- To delete all records: Navigate to "Excluir registros" (Delete records), press "Enter." Confirm with "Sim" (Yes) or cancel with "Não" (No).
Downloading Records to PC:
- Connect the instrument to a computer via USB-C cable.
- Run the AKSO_Max_Logger program on the computer.
- Select the correct COM Port for the instrument.
- Click "Conectar" (Connect). Records will download automatically.
- Click "Salvar como .CSV" (Save as .CSV) to save records to the computer.
Settings:
- Access "Configs" from the main menu using ▲/▼ and "Enter."
- User ID: Selects user identification number (0-8). Use ▲/▼, then "Salvar" (Save).
- Sample ID: Selects sample identification letter (A-H). Use ▲/▼, then "Salvar" (Save).
- Backlight: Adjusts backlight intensity. Use ▲/▼, then "Salvar" (Save).
- Date/Time: Adjusts date and time. Use ▲/▼ for each digit, then "Salvar" (Save).
- Language: Selects language (Portuguese, English, Spanish). Use ▲/▼, then "Salvar" (Save).
- Stand by: Sets auto-shutdown time (OFF, 30s, 45s, 60s, 90s, 120s) or "always on" (when USB powered). Use ▲/▼, then "Salvar" (Save).
- Factory Standard: Restores all factory default settings (User ID, Sample ID, Backlight, Language, Stand by). Access and press "Sim" (Yes).
- About: Displays device information. Press "Voltar" (Back) to return.
- Voltar (Back): Returns to the previous screen.
Maintenance Features
Battery Replacement:
- When the low battery indicator appears, replace the 9V battery.
- Remove the cover fixing screw underneath the Turbidez Max using a Philips screwdriver.
- Carefully unclip the instrument cover.
- Remove the used battery.
- Install a new battery, observing the correct polarity.
- Close the instrument lid, ensuring proper fit.
- Replace and firmly tighten the set screw without forcing it.
- Notes:
- Always use new, alkaline, and quality batteries to prevent leaks or damage.
- If the instrument will be unused for more than 15 days, remove the battery before storage.
Tips and Care for the Instrument:
- NEVER use the battery and AC/DC adapter simultaneously to avoid irreversible circuit damage.
- Avoid falls or mechanical shocks to prevent irreversible damage.
- Protect the Turbidez Max from splashing water to prevent moisture from entering the circuit.
Cuvettes:
- After each analysis, wash cuvettes with distilled (or deionized) water to prevent residue accumulation or staining.
- Periodically clean measuring cuvettes with bleach (10% diluted in clean water).
- Handle cuvettes carefully; scratches, abrasions, and stains can cause significant reading deviations.
Failures and Solutions:
- Discharged battery: Replace battery or use USB power.
- Low battery: Replace battery or use USB power.
- Above the range: Sample value exceeds instrument range. Perform new sample collection and re-read.
- Adjustment failure: Default solution with changed nominal value. Replace standard solutions used for adjustment.
- High battery consumption: Too many functions in use. Decrease screen light and/or set shorter auto-shutdown time.
- Scratched measurement cuvette: Clean the measurement cuvette.
- Cuvette with stains or residue: Clean the measurement cuvette.
- Sample is not homogeneous: Gently shake the sample before measurement.
- Maladjusted reading curve: Perform measurement adjustment.
Warranty and Disposal:
- The product has a 2-year warranty against manufacturing defects.
- Contains a battery and electronic components. Do not dispose of with common household waste. Deliver to designated collection points according to local guidelines. Proper disposal prevents negative environmental and health consequences.
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