SWEVY SW36C Digital Refractometer User Manual

1. Introduction

The SWEVY SW36C Digital Refractometer is a precision instrument designed for accurately measuring the sugar content (Brix) in various liquids such as fruit juices, beverages, and milk tea. Featuring an LCD display, automatic temperature compensation (ATC), and a user-friendly interface, it provides reliable and quick measurements for both professional and home use.

2. Safety Information

Do not immerse the instrument in water or other liquids.
Avoid exposing the instrument to direct sunlight or extreme temperatures.
Handle the optical prism with care to prevent scratches or damage.
Keep out of reach of children.
Use only the specified battery type (2xAAA).

3. Product Overview

Familiarize yourself with the components of your SWEVY SW36C Digital Refractometer:

Diagram of SWEVY SW36C Refractometer with labeled parts — Figure 1: Product Button Introduction and Dimensions

Measurement Slot: Where the sample is placed for measurement.
Optical Prism: The sensitive part that interacts with the sample.
Display Screen: LCD screen showing temperature, Brix percentage, and refractive index.
Zero Reset Button (ZERO): Used for calibration and accessing settings.
Power/Measure Button (START): Turns the device on/off and initiates measurement.
Metal Sample Measuring Groove: Durable and easy-to-clean area for sample placement.

Close-up of the metal sample tank without cover — Figure 2: Metal Sample Tank without Cover

4. Specifications

Parameter	Value
Model	SW-36C
Measuring Range	0~36% Brix
Accuracy	±0.2% Brix or ±1 °C
Resolution	0.1% Brix
Temperature Compensation	10~40 °C
Power Supply	2xAAA batteries (not included)
Weight	113g
Dimensions (LWH)	117 x 55 x 29 mm
Use	Sugar measurement
Certification	CE, RoHS

5. Setup

5.1. Battery Installation

The instrument requires two AAA batteries (not included). To install:

Locate the battery compartment cover on the back of the device.
Remove the cover.
Insert two AAA batteries, ensuring correct polarity (+/-).
Replace the battery cover securely.

5.2. Language Setting

The device supports both Chinese and English languages.

Press and hold the ZERO button for 2 seconds to enter the settings interface.
Press the ZERO button repeatedly to cycle through options until 'LANG' is selected.
Press the START button to toggle between 'EN' (English) and '中文' (Chinese).
Once your desired language is selected, press and hold the ZERO button for 2 seconds to return to the main interface.

Image showing language switching function on the refractometer display — Figure 3: Language Switching Function

5.3. Zero Calibration (Zero-setting)

Before first use or if measurements seem inaccurate, perform a zero calibration using clean or pure water.

Ensure the measurement slot is clean and dry (see Cleaning section).
Place approximately 0.3 ml (about 1 mm depth) of clean or pure water into the measurement slot.
Press the START button. The device will display a value.
Check if the displayed value is 0.0%.
If the value is not 0.0%, press the ZERO button to reset the device to 0.0%.

Image demonstrating one-key zero setting with pure water — Figure 4: One-Key Zero Setting for Calibration

6. Operating Instructions

6.1. Sample Preparation

Temperature: For accurate results, ensure the sample and the instrument are at a similar temperature. If the sample is very cold or hot, allow it to equilibrate with the instrument for at least 20 seconds in the measurement slot before taking a reading. The device features automatic temperature compensation (ATC) within 10-40°C to minimize errors due to temperature differences.
Clarity: If the measuring solution contains suspended solids, remove them using a filter spoon or gauze as much as possible.
Homogeneity: Mix the measuring solution evenly. Avoid using metal or hard objects that could scratch the optical prism. Uneven solutions or suspended solids can lead to inaccurate measurements.

Diagram illustrating automatic temperature compensation — Figure 5: Automatic Temperature Compensation

6.2. Measurement Steps

Ensure the device is powered on by pressing the START button.
Clean the measurement slot thoroughly with clean water and a soft cloth, then dry it completely.
Add at least 0.3 ml (half of the sample tank) of the prepared sample liquid into the measurement slot using a dropper.
Press the START button. The measurement data (Brix percentage, temperature, and refractive index) will be displayed on the screen within 3 seconds.
For best accuracy and reliability, suck out the measuring solution and repeat the measurement several times.

Step-by-step diagram for using the digital Brix refractometer — Figure 6: Digital Brix Refractometer Measurement Steps

6.3. Demonstration Video

Video 1: Digital Sugar Meter in Use - Demonstrates measurement of sugar content in various fruits.

7. Maintenance

7.1. Cleaning

Regular cleaning ensures accurate readings and extends the life of your refractometer.

If there is dirt or oiliness in the measuring slot, or if the instrument has not been used for a long time, it should be cleaned thoroughly.
Drip clean water into the measuring slot and wipe with paper towels at least three times. Dispose of used paper towels.
For stubborn oiliness or difficult-to-clean residues, use ethanol or soapy water to clean the measuring slot.
Always ensure the optical prism is clean and free from scratches.

7.2. Storage

Store the refractometer in a dry, cool place away from direct sunlight and extreme temperatures. Keep it in its original packaging or a protective case when not in use.

8. Troubleshooting

Error Message / Symptom	Reason	Solution
Excessive light	External light is too strong to measure.	Move to a less brightly lit area.
High Temp / Low Temp	The temperature in the measuring slot is out of range (outside 10-40°C).	Allow the instrument and sample to equilibrate to room temperature (10-40°C).
Re zero	Zero calibration is required.	Perform the zero-clearing step again with pure water.
Less solution / Less water	Too little sample or clean water in the measuring slot.	Ensure at least 0.3 ml of liquid is in the slot.
Out of range	Excessive concentration of the sample.	The sample's Brix value exceeds the 0-36% range. Dilute the sample if necessary or use a refractometer with a higher range.
Low voltage	Low battery power.	Replace the AAA batteries.
Fault	Possible damage to components.	Contact customer support for assistance.

9. User Tips

Always clean the prism thoroughly between different samples to avoid cross-contamination and ensure accurate readings.
For highly viscous samples, allow extra time for the sample to settle and for temperature equilibration before taking a reading.
When measuring, ensure there are no air bubbles under the sample cover, as these can affect accuracy.
If you suspect an inaccurate reading, re-calibrate the device with pure water and re-test the sample.

10. Warranty and Support

For detailed warranty information, technical support, or service inquiries, please refer to the official product documentation or contact the seller directly. A user manual in PDF format is available for download: View User Manual (PDF).

SWEVY SW36C