GOYOJO Digital Brix Refractometer Model 128 User Manual

Introduction

The GOYOJO Digital Brix Refractometer Model 128 is a precision instrument designed for measuring the sugar content (Brix) in various liquids. It offers fast, accurate, and reliable results, making it suitable for applications in agriculture, food and beverage production, and laboratory settings. This device features Automatic Temperature Compensation (ATC) for consistent accuracy across a temperature range of 10°C to 80°C, a high-precision sensor, and a compact, portable design.

Key features include:

• Swift measurement with high precision sensor, providing results in as little as 3 seconds.
• Brix range of 0-55% with an accuracy of ±0.5 Brix.
• Automatic Temperature Compensation (ATC) for reliable readings between 10°C and 80°C.
• Compact and lightweight design for portability and field use.
• Requires only 3-5 drops (0.2 ml) of sample for measurement.

The GOYOJO Digital Brix Refractometer, showcasing its compact design and key features like HD display, battery, temperature compensation, anti-glare, high precision sensor, and waterproof/dustproof capabilities.

Setup

Unpacking and Components

Carefully unpack the refractometer and all accessories. Verify that all components are present:

• Digital Refractometer Unit
• 2*AAA Batteries (included)
• Dropper
• Mini Screwdriver
• Spare Screws
• Cleaning Cloths
• Calibration Certificate
• User Manual

Battery Installation

The device requires 2 AAA batteries. To install or replace batteries:

1. Locate the battery compartment on the back of the device.
2. Use the provided mini screwdriver to unscrew the battery compartment cover.
3. Insert 2 AAA batteries, ensuring correct polarity (+/-).
4. Replace the cover and secure it with the screws.

A short video demonstrating the process of installing AAA batteries into the GOYOJO Digital Brix Refractometer's battery compartment using the included screwdriver.

Device Overview

Familiarize yourself with the different parts of your refractometer:

This image displays the GOYOJO Digital Brix Refractometer with its key components labeled, including the Protective Shield, Prism, Water Reservoir Platform, Power Button, Measure Button, Calibration Button, Temperature Button, and Battery Compartment.

Operating Instructions

Calibration

For accurate measurements, calibrate the refractometer with distilled water before first use and periodically thereafter:

1. Ensure the prism surface is clean and dry.
2. Apply 3-5 drops of distilled water to the sample tank.
3. Close the protective shield.
4. Press the CAL button. The display should show "0.0%" or similar, indicating successful calibration.
5. Clean the prism thoroughly with distilled water and a soft cloth after calibration.

Measurement Steps

Follow these steps to measure the Brix value of your sample:

1. Press the ON/OFF button to power on the device.
2. Ensure the prism surface is clean and dry.
3. Using the dropper, add 3-5 drops (approximately 0.2 ml) of the solution into the sample tank. Ensure the sample covers the entire prism surface without overflowing.
4. Close the protective shield to prevent light interference and sample evaporation.
5. Press the MEAS button to initiate the measurement. The result will be displayed on the screen within 3 seconds.
6. Record the reading.
7. Immediately after measurement, clean the residual sample from the prism and protective shield using distilled water and a soft, lint-free cloth. Dry thoroughly.

A four-step visual guide demonstrating the measurement process: 1. Pressing the power button, 2. Adding sample to the tank, 3. Pressing the MEAS button for results, and 4. Cleaning the device after use.

A short video demonstrating how to apply a liquid sample to the refractometer's prism and initiate a measurement, showing the digital display of the result.

Switching Measurement Modes and Temperature Display

The refractometer can display results in different modes (e.g., Brix, Refractive Index) and show the current temperature.

• To switch between measurement modes (e.g., Brix, Refractive Index), press and hold the MEAS button. The display will cycle through available modes.
• To display the current temperature, press the TEMP button.

An image illustrating how to switch between measurement modes (Brix, Refractive Index) by holding the 'MEAS' button, and how to display the temperature by pressing the 'TEMP' button.

Maintenance

Cleaning

Proper cleaning is crucial for maintaining the accuracy and longevity of your refractometer.

• Always clean the prism and protective shield immediately after each use.
• Use distilled water and a soft, lint-free cloth to gently wipe away any residual sample.
• Do not use abrasive materials or harsh chemicals, as these can damage the prism surface.
• The device is waterproof, allowing for washing under running water. However, ensure the battery box remains dry and protected from water ingress.

An image highlighting the waterproof feature of the refractometer, showing water being poured over the prism for cleaning, with a note to keep the battery box dry.

Storage

When not in use, store the refractometer in its protective case in a cool, dry place, away from direct sunlight and extreme temperatures.

Troubleshooting

This section addresses common issues you might encounter with your GOYOJO Digital Brix Refractometer Model 128.

• Inaccurate Readings: Ensure the device is properly calibrated with distilled water. Verify the sample temperature is within the ATC range (10°C to 80°C). Clean the prism thoroughly before each measurement.
• No Display/Device Not Turning On: Check battery installation and ensure batteries are not depleted. Replace batteries if necessary.
• "ERR" or Error Message: This may indicate a measurement error or a problem with the sample. Re-clean the prism, re-calibrate, and re-test the sample. Ensure the sample volume is sufficient (3-5 drops).
• Slow Response: Ensure the device and sample are at a stable temperature. Allow a few moments for the ATC to stabilize if there's a significant temperature difference.

If problems persist, contact customer support for further assistance.

Specifications

The following table details the technical specifications of the GOYOJO Digital Brix Refractometer Model 128:

Warranty and Support

Specific warranty information for the GOYOJO Digital Brix Refractometer Model 128 is not provided in this manual. Please refer to the product packaging or contact GOYOJO customer service for details regarding warranty coverage and support.

For technical assistance or inquiries, please visit the official GOYOJO website or contact their customer support channels.