WA-160A Digital Food Water Activity Meter Instruction Manual

1. Introduction

The Graigar WA-160A is a portable digital water activity meter designed for precise measurement of water activity in various food products. Water activity (aw) is a critical parameter that reflects the amount of free water available for microbial growth and chemical reactions, directly impacting food stability, quality, and shelf life.

This compact and lightweight device offers quick and accurate measurements, making it an ideal tool for quality control in food processing, storage, and research. Its integrated sensors and readings provide convenience and efficiency for on-the-go analysis.

Figure 1: The Graigar WA-160A Digital Food Water Activity Meter, a compact device for measuring water activity.

2. Safety Information

Please read and understand all safety instructions before operating the WA-160A meter to ensure safe and proper use. Failure to follow these instructions may result in damage to the device or inaccurate readings.

• Do not expose the device to extreme temperatures, humidity, or direct sunlight.
• Avoid dropping or subjecting the device to strong impacts.
• Keep the sensor clean and free from debris. Do not touch the sensor directly.
• Use only the specified battery type (if applicable) and ensure correct polarity during installation.
• Do not attempt to disassemble or repair the device yourself. Refer to qualified personnel for service.
• Store the device in its carrying case when not in use to protect it from dust and damage.

3. Product Components

The WA-160A Water Activity Meter package includes the following items:

• Main Unit (WA-160A Meter)
• Carrying Case
• Operation Manual (this document)
• Sample Plates (multiple)

Figure 2: The WA-160A meter, sample plates, and other accessories neatly stored within its protective carrying case.

4. Setup

4.1 Battery Installation

The WA-160A meter requires batteries for operation. Batteries are not included with the unit and must be purchased separately.

1. Locate the battery compartment cover on the back of the meter.
2. Slide or unclip the cover to open the compartment.
3. Insert the required batteries, ensuring correct polarity (+/-) as indicated inside the compartment.
4. Replace the battery compartment cover securely.

Figure 3: Rear view of the WA-160A meter, illustrating the location of the battery compartment for installation.

4.2 Initial Preparation

• Ensure the sample plates are clean and dry before use.
• Place the meter on a stable, flat surface during measurements.

5. Operating Instructions

5.1 Powering On/Off

• To power on the device, press the "POWER TX" button located on the front panel.
• The device features an automatic shutdown function to conserve battery life.
• To manually shut down the device, press and hold the "POWER TX" button until the display turns off.

5.2 Taking a Measurement

The WA-160A integrates sensors and readings for a streamlined measurement process.

1. Prepare your food sample and place a suitable amount into a clean sample plate. Ensure the sample is evenly distributed and covers the bottom of the plate.
2. Carefully place the sample plate onto the designated measurement area of the meter. Ensure a proper seal to prevent ambient air from affecting the reading.
3. The measurement process will begin automatically or by pressing a designated measurement button (refer to on-screen prompts if any).
4. The device will display the water activity (aw) reading on its screen. Measurements typically complete within 5 minutes.
5. Record the reading once it stabilizes.

Figure 4: A close-up view of the WA-160A's digital display, showing a water activity reading of 0.47 aw.

5.3 Understanding Water Activity

Water activity (aw) is a measure of the unbound water in a food product. It is a critical factor in determining the shelf life and safety of food. A lower water activity generally indicates a longer shelf life and reduced risk of microbial spoilage. The WA-160A measures this value, typically ranging from 0 to 1.0 aw.

Figure 5: The WA-160A meter shown alongside various food items such as cake, jerky, and dried fruits, illustrating its application in different food types.

6. Maintenance

6.1 Cleaning the Device

• Wipe the exterior of the meter with a soft, dry cloth.
• For stubborn stains, a slightly damp cloth with mild detergent can be used, followed by a dry cloth.
• Do not use abrasive cleaners or solvents, as these can damage the plastic housing or display.
• Ensure the sensor area and sample plates are kept clean and free of food residues. Use a soft brush or lint-free cloth for the sensor, being careful not to damage it.

6.2 Storage

• When not in use, store the WA-160A meter in its original carrying case to protect it from dust, moisture, and physical damage.
• Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
• If storing for an extended period, remove the batteries to prevent leakage and potential damage to the device.

7. Troubleshooting

This section provides solutions to common issues you might encounter with your WA-160A meter.

If the problem persists after attempting these solutions, please contact customer support.

8. Specifications

Detailed technical specifications for the Graigar WA-160A Digital Food Water Activity Meter:

9. Warranty and Support

9.1 Warranty Information

For specific warranty terms and conditions, please refer to the warranty card or documentation included with your product package. Manufacturer warranties typically cover defects in materials and workmanship for a specified period from the date of purchase. Extended protection plans may also be available for purchase separately.

9.2 Customer Support

If you have any questions, require technical assistance, or need to report an issue with your Graigar WA-160A meter, please contact the seller or manufacturer's customer support. Have your product model number (WA-160A) and purchase details ready when contacting support.

For support related to your purchase, you may contact GRAIGAR USA, the seller of this product.