1. Introduction
The VTSYIQI VTS-160A Water Activity Meter is designed to measure the water activity of various food products. Water activity is a critical factor influencing food stability, microbial growth, and chemical, enzymatic, and physical changes that affect food quality and shelf life. This portable device provides accurate measurements to assist in food preservation and quality control.
Key Features:
- Portable and lightweight design (approx. 100g).
- High precision with an accuracy of ±0.02 aw.
- Fast measurement time, typically 5 minutes.
- Integrated sensors and readings for ease of use.
- LCD backlight digital display showing water activity and temperature simultaneously.
- Automatic and manual shutdown functions.
- Undervoltage alarm indication.
- USB data output option for PC connection.
Figure 1.1: The VTS-160A Water Activity Meter in use, demonstrating its application across various food types.
Figure 1.2: Product Introduction diagram highlighting the main components of the VTS-160A meter.
2. Components and Accessories
The VTS-160A Water Activity Meter comes with the following standard accessories:
- Main Unit (VTS-160A Water Activity Meter)
- Sample Plate(s)
- Carrying Case
- Operation Manual
Figure 2.1: The VTS-160A Water Activity Meter with its standard accessories, including the carrying case and sample plates.
3. Specifications
Technical Parameters:
| Parameter | Value |
|---|---|
| Display | 6-bit backlight LCD digital display (3-bit humidity aw, 3-bit temperature) |
| Range | 0 to 1.0 aw |
| Resolution | ±0.01 aw |
| Accuracy | ±0.02 aw |
| Sensor | Non-conductive humidity sensor |
| Sampling Time | 5 minutes (typical) |
| Operating Condition (Temperature) | 0 to 50°C (32 to 122°F) |
| Operating Condition (Humidity) | <95% RH (non-condensing) |
| Power Supply | 2 x 1.5V AAA (UM-4) Batteries (not included) |
| Dimensions | 135 x 70 x 44 mm |
| Weight | 100g (without batteries) |
General Specifications:
- Product Dimensions: 40 x 10 x 25 cm (packaged)
- Item Weight: 4 kg (packaged)
- Color: Grey
4. Setup
4.1 Battery Installation
- Locate the battery compartment on the back of the meter.
- Slide open the battery cover.
- Insert two 1.5V AAA (UM-4) batteries, ensuring correct polarity.
- Close the battery cover securely.
Figure 4.1: Open battery compartment on the back of the VTS-160A meter.
5. Operating Procedure
5.1 Measuring Water Activity
- Press the Power key to switch on the meter. The gauge will enter auto mode, automatically initiating the water activity test.
- Place your sample into a clean sample plate. Ensure the sample is representative and fills the plate adequately without overflowing.
- Carefully cover the sensor of the meter onto the sample plate, ensuring a good seal.
- Allow approximately 5 minutes for the reading to stabilize. Once stable, the water activity value will be displayed on the LCD.
- After testing, press and hold the Power key for approximately 3 seconds to turn off the meter.
- Clean the sample plate thoroughly after each use to prevent cross-contamination and ensure accurate future readings.
Figure 5.1: Step-by-step guide for performing a water activity measurement.
6. Reading Correction (Calibration)
If it becomes necessary to correct the reading value, follow these steps:
- Press and hold the Power key for approximately 7 seconds.
- Release the key when the signal 'Cor' appears on the display. A decimal number with two places, representing the current correction value, will be shown.
- Open the battery cover on the back of the meter. Below the battery slot, you will find two small holes.
- Using a small, hard, non-conductive tool (e.g., a small screwdriver or toothpick), gently touch the key inside the left hole to increase the correction value.
- Gently touch the key inside the right hole to decrease the correction value. Adjust the value as needed.
- Press the Power key again to confirm the new correction value. The measured reading will update, and the calibration is complete.
Figure 6.1: Step-by-step guide for performing reading correction.
7. Maintenance
7.1 Cleaning
- Always clean the sample plate immediately after each use to prevent residue buildup, which can affect measurement accuracy.
- Use a soft, damp cloth to wipe the exterior of the meter. Do not use abrasive cleaners or solvents.
- Ensure no liquids enter the sensor area or battery compartment.
7.2 Storage
- When not in use, store the meter in its carrying case to protect it from dust and physical damage.
- Store 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.
8. Troubleshooting
If you encounter issues with your VTS-160A Water Activity Meter, consider the following:
- No Power: Check if the batteries are correctly installed and have sufficient charge. Replace batteries if necessary.
- Inaccurate Readings: Ensure the sample plate is clean and the sensor is properly seated on the sample. Perform a reading correction as described in Section 6. Verify that the operating conditions (temperature, humidity) are within the specified range.
- Slow Readings: Ensure the sample is properly prepared and the environment is stable.
- Display Issues: If the display is dim or flickering, replace the batteries.
For persistent issues not resolved by these steps, please contact customer support.
9. Support Information
For technical assistance, warranty inquiries, or service, please contact VTSYIQI customer support through your purchase platform or the official VTSYIQI website.
Please have your model number (VTS-160A) and purchase date available when contacting support.
