1. Introduction
The Yieryi Food pH Meter (Model YY-2023-Q) is a high-accuracy digital instrument designed for precise pH and temperature measurement of various food items. Featuring a specialized spear-tip probe and a clear LCD display, it provides quick and reliable readings for applications such as testing meat, cheese, dough, sauces, and other semi-solid or liquid foods. This manual provides essential information for the proper setup, operation, calibration, and maintenance of your pH meter to ensure optimal performance and longevity.
2. Product Overview
2.1 Key Features
- High-Accuracy Measurement: Provides accurate pH readings with a dual-pin spear-tip probe, ideal for food, beverages, and other liquids.
- Easy Calibration: Supports 2-point calibration using pH 4.00 and pH 6.86 buffer solutions for precise measurements.
- LCD Display: Clear, backlit LCD screen for easy reading of test results in various lighting conditions.
- Wide Application: Suitable for testing pH in meat, cheese, dough, sauces, tea, beer, vinegar, milk, and more.
- Portable & User-Friendly: Lightweight, compact, and easy to operate for both professionals and home enthusiasts.
- Waterproof Design: IP67 waterproof rating ensures durability and safe use in wet environments.
- Power Saving: Features automatic shut-down after 8 minutes of inactivity to conserve battery life.
- Temperature Compensation: Automatic temperature compensation (ATC) for accurate readings across a temperature range of 0°C to 50°C.
2.2 Components Diagram
2.3 Package Contents
- 1 x Yieryi Food pH Meter (Model YY-2023-Q)
- 2 x pH Calibration Liquids (pH 4.00 & 6.86)
- 1 x Probe Protection Liquid (KCL solution)
- 1 x User Manual
- 1 x Exquisite Packaging Box
- 1 x Drop Protection Module
3. Specifications
| Attribute | Value |
|---|---|
| Model Number | YY-2023-Q |
| Brand Name | yieryi |
| Measuring Range (pH) | 0.00-14.00 pH |
| Accuracy (pH) | ±0.01 pH |
| Resolution (pH) | 0.01 pH |
| Temperature Range | 0°C – 80°C (32°F – 176°F) |
| Temperature Compensation | 0°C – 50°C (32°F – 122°F) |
| Calibration | pH 4.00, 6.86, 9.18 (Automatic Calibration) |
| Battery | 2 x 1.5V AAA Batteries (Not Included) |
| Display Type | DIGITAL (with Backlight) |
| Waterproof Rating | IP67 |
| Power Saving | Automatic shut-down after 8 minutes |
| Dimensions | 155mm x 30mm x 20mm |
| Weight | Approx. 80g |
| Certification | CE |
4. Setup
4.1 Battery Installation
- Locate the battery compartment on the back of the meter.
- Open the battery cover.
- Insert 2 x 1.5V AAA batteries, ensuring correct polarity.
- Close the battery cover securely.
4.2 Initial Probe Activation
Before first use or after prolonged storage, the electrode needs to be activated to ensure accurate readings. Immerse the electrode in KCL storage solution for 12 hours. Ensure the instrument is hanging and the probe does not touch the cup wall or bottom during activation.
5. Operating Instructions
5.1 General Usage Steps
- Remove the protective cover from the probe by pulling it downwards.
- Rinse the pH probe with distilled water and gently wipe it dry with a clean tissue.
- Turn on the pH meter by pressing the ON/OFF/CAL button.
- Insert the spear-tip probe into the solid or semi-solid sample you wish to test. Ensure the probe is fully immersed in the sample.
- Wait for the reading on the LCD display to stabilize.
- Record the pH and temperature readings.
- After use, rinse the electrode with distilled water and gently wipe it dry.
- Close the protective cover upwards to protect the probe.
5.2 Specific Applications
- Meat: The pH of fresh meat should ideally be between 5.5 and 6.2 during storage.
- Cheese: The pH range for cheeses is typically from 5.1 to 5.9. If the pH is too low, the cheese may appear mushy; if too high, it may become too firm.
- Dough (Sourdough Breadmaking): The ideal pH of a well-mixed dough is about 5.0 to 6.0. After fermentation, the pH typically decreases to about 3.8 to 4.6.
- Fermenting Sauce: This pH meter is an essential tool for making all sauces, with a range of 0.00-14.00 pH and ±0.01 accuracy.
- Sausage Making: The pH of fermented sausages is usually between 4.5 and 5.5, depending on the degree of fermentation. Temperature control below 15°C is recommended.
6. Calibration
Regular calibration ensures the accuracy of your pH meter. The YY-2023-Q supports 2-point automatic calibration using pH 4.00 and pH 6.86 buffer solutions.
6.1 Calibration Steps (Priority: pH 6.86 then pH 4.00)
- Unscrew the caps on the bottles of pH 6.86 and pH 4.00 standard buffer solutions.
- Rinse the electrode with distilled water and gently wipe it dry.
- Turn on the pH Meter by pressing the ON/OFF/CAL button.
- Calibrate pH 6.86 first: Immerse the electrode in the pH 6.86 buffer solution.
- Wait for the value on the display to stabilize.
- Press the "CAL" button for 5 seconds. The screen will show "CAL" jumping.
- Once the value stabilizes around 6.86, press the "6.86" button. The calibration for pH 6.86 is now complete.
- Rinse the electrode with clean water and gently wipe it dry.
- Repeat steps 4-7 to calibrate pH 4.00, immersing the electrode in the pH 4.00 buffer solution and pressing the "4.00" button when stable.
7. Maintenance
7.1 Probe Life Extension
To effectively prevent the loss of reference solution from the electrode and prolong its lifespan, add the supplied KCL solution to the electrode cover, keeping the sponge moist. This helps maintain the original pH potential balance of the electrode, leading to more accurate measurements.
7.2 Electrode Maintenance for Prolonged Storage
If the pH meter has not been used for a long time, it is recommended to soak the electrode in KCL solution for 2 hours to reactivate it before use.
8. Troubleshooting
- Q: How do I calibrate the pH meter?
- A: Use the provided pH 4.00 and pH 6.86 solutions to calibrate. Detailed instructions are available in Section 6 of this manual.
- Q: Can I test meat or cheese with this meter?
- A: Yes, this meter is specifically designed for testing the pH of meat, cheese, dough, and other food items.
- Q: Is the probe replaceable?
- A: Yes, the probe can be replaced if needed. Please contact customer support for further details on replacement probes.
- Q: Does it come with batteries?
- A: No, the meter does not include batteries. You will need 2 x 1.5V AAA batteries for operation.
- Q: Is the meter waterproof?
- A: Yes, it has an IP67 waterproof rating, making it safe for use in various environments, but avoid full submersion for extended periods.
9. User Tips
- Always ensure the probe is clean before and after each use to prevent contamination and ensure accurate readings.
- For solid or semi-solid samples, ensure the probe is inserted deep enough to get a representative reading.
- Allow sufficient time for the reading to stabilize on the LCD display before recording the value.
- Store the pH meter with the protective cap securely in place and the sponge inside the cap kept moist with KCL solution.
- Avoid touching the glass bulb of the electrode with your fingers, as oils and dirt can affect its performance.
- When calibrating, use fresh buffer solutions and ensure they are at room temperature for best results.
10. Warranty & Support
Yieryi is committed to providing quality products and customer satisfaction. If you encounter any issues with your Food pH Meter or have questions regarding its operation, maintenance, or warranty, please contact Yieryi customer service. Our team is available to provide assistance and ensure you have a satisfactory experience with your product.
For further assistance, please refer to the contact information provided on the product packaging or the official Yieryi website.
