1. Introduction
The Atago PAL-2 is a high-range digital hand-held pocket refractometer designed for precise measurement of Brix (sugar concentration) in various high-concentration samples. This device is suitable for applications in the food and beverage, pharmaceutical, and chemical industries, among others. Its compact and ergonomic design allows for easy one-handed operation and portability.
Key features include Automatic Temperature Compensation (ATC) for accurate readings across a temperature range, an External Light Interference (ELI) warning, and an IP-65 rating for protection against dust and water jets, allowing for easy cleaning.
Figure 1: The Atago PAL-2 Digital Hand-Held Pocket Refractometer. This image displays the device with its digital screen showing a Brix reading of 80.7% and a temperature of 20.3°C. The sample prism is visible at the top, and the 'START' and 'ZERO' buttons are below the screen.
2. Package Contents
Verify that all items listed below are present in the package:
- Atago PAL-2 Refractometer
- AAA Alkaline Batteries (x2)
- Plastic Storage Case
- Instruction Manual (this document)
Figure 2: The Atago PAL-2 Refractometer shown alongside a black lanyard. This image illustrates the compact size of the device and suggests its portability with the included accessory.
3. Setup
3.1. Battery Installation
- Locate the battery compartment cover on the back of the unit.
- Open the cover and insert two (2) AAA alkaline batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
3.2. Initial Power On
Press the START button to power on the device. The LCD will display the current temperature and battery level.
4. Operating Instructions
4.1. Calibration (Zero Setting)
For accurate measurements, calibrate the refractometer with water before use, especially if the ambient temperature has changed significantly.
- Ensure the prism surface is clean and dry.
- Apply a few drops of clean tap water or distilled water onto the prism surface, ensuring it covers the entire surface without air bubbles.
- Close the daylight plate gently.
- Press the ZERO button. The display will show "0.0%" or "CAL" briefly, then return to 0.0% Brix. This indicates successful calibration.
- Clean the prism surface thoroughly with a soft cloth or tissue.
4.2. Taking a Measurement
- Ensure the prism surface is clean and dry.
- Apply a few drops (approximately 0.3 mL) of the sample liquid onto the prism surface. Ensure the sample covers the entire surface.
- Close the daylight plate gently.
- Press the START button. The measurement will be displayed in approximately 3 seconds.
- Read the Brix value and temperature from the LCD.
- After measurement, clean the prism surface immediately with a soft, damp cloth or tissue, then dry it.
4.3. Automatic Temperature Compensation (ATC)
The PAL-2 features ATC, which automatically adjusts the Brix reading to a standard reference temperature (typically 20°C) based on the sample's measured temperature. This ensures accurate readings even if the sample temperature fluctuates between 10°C and 100°C.
4.4. External Light Interference (ELI) Warning
If direct light interferes with the measurement, the device will display a warning message. To resolve this, move the refractometer to a location with less direct light or shield the prism from strong light sources during measurement.
5. Maintenance and Care
5.1. Cleaning the Prism
Always clean the prism surface immediately after each use. Use a soft, damp cloth or tissue to wipe off the sample. For sticky or viscous samples, a small amount of warm water can be used. The IP-65 rating allows the unit to be washed under running water, but avoid submerging the entire device.
5.2. General Cleaning
Wipe the body of the refractometer with a soft, dry cloth. Do not use abrasive cleaners or solvents, as these may damage the casing or display.
5.3. Storage
Store the refractometer in its plastic storage case in a cool, dry place, away from direct sunlight and extreme temperatures. Remove batteries if the device will not be used for an extended period to prevent leakage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No display when powered on | Dead or incorrectly installed batteries | Replace batteries with new AAA alkaline batteries, ensuring correct polarity. |
| Inaccurate readings |
|
|
| "ELI" warning displayed | External light interference | Move the device away from direct light sources or shield the prism during measurement. |
| Slow measurement response | Sample temperature outside ATC range or extreme ambient temperature | Allow sample to reach a temperature within the 10°C to 100°C range. Ensure ambient temperature is between 10°C and 40°C. |
7. Specifications
| Parameter | Value |
|---|---|
| Model Number | PAL-2 (R3000-2) |
| Measurement Scale Range (Brix) | 45.0 to 93.0% |
| Measurement Scale Range (Temperature) | 9.0 to 99.9 °C |
| Measurement Resolution (Brix) | 0.1% |
| Measurement Resolution (Temperature) | 0.1 °C |
| Measurement Accuracy (Brix) | ± 0.2% |
| Measurement Accuracy (Temperature) | ± 1 °C |
| Sample Measurement Temperature (ATC) | 10 to 100 °C |
| Ambient Temperature | 10 to 40 °C |
| Sample Volume | 0.3 mL |
| Measurement Time | 3 seconds |
| Ingress Protection (IP) Rating | IP-65 (Dust tight, protected against water jets) |
| Display | Digital LCD |
| Power Supply | (2) AAA Alkaline Batteries |
| Dimensions (H x W x D) | 10.9 x 5.5 x 3.1 cm |
| Weight | 100 g |
8. Safety Information
- Do not drop or subject the device to strong impacts.
- Avoid exposing the device to extreme temperatures or direct sunlight for prolonged periods.
- Do not attempt to disassemble or modify the refractometer, as this will void the warranty and may cause damage.
- Keep the device out of reach of children.
- Dispose of batteries according to local regulations.
9. Warranty and Support
Atago products are manufactured to high quality standards. For warranty information, technical support, or service, please contact Atago Co., Ltd. directly or your authorized Atago distributor. Refer to the official Atago website for contact details and the most current warranty policy.
Atago Co., Ltd. is committed to providing reliable analytical instruments that comply with international standards such as HACCP, GMP, GLP, and various ISO standards.
