WATER ACTIVITY METER

1. APPLICATIONS & FEATURES

• The Water Activity, mainly reflects the amount of free water in the state of food balance, the stability of food and the possibility of microbial reproduction, and the chemical, and physical changes that can cause the change of food quality. It is often used to measure the dryness enduring ability of the microorganisms. By measuring the water activity of food and selecting reasonable packing and storage methods, the use of preservatives can be reduced and the shelf life of food, grain and fruits and vegetables can be judged.
• The WA-60A can be used to measure the water activity of foods. No matter when and where you need to measure water activity, WA-60A water activity meter is your unique choice. This is a real portable water activity meter, with a weight of only 100 grams, lighter than a mobile phone, and a precision of 0.03 aw, easy to measure water activity anytime and anywhere.
• Sensors and readings are integrated.
• Easy reading, water activity and temperature of the samples displayed together.
• It has automatic shutdown, manual shutdown function and undervoltage alarm indication function.
• Use USB data output to connect with PC.
• Provide Bluetooth data output choice.

2. TECHNICAL PARAMETERS

Standard Accessories

• Main Unit
• Sample Plate
• Carrying Case
• Operation Manual

Optional Accessories

• USB data output
• Bluetooth data output

3. FRONT PANEL DESCRIPTIONS

The front panel features the following components:

• 3-1 Display: Shows water activity and temperature.
• 3-2 Water Activity Value: Displays the measured water activity.
• 3-3 Temperature Value: Displays the measured temperature.
• 3-4 Data Cable Interface: Port for connecting to a computer via USB.
• 3-5 Battery Cover on the Back: Access panel for battery replacement.
• 3-6 Power key: Button to turn the device on/off and for other functions.
• 3-7 Sensor: The probe used to measure the sample.

Visual representation shows a handheld device with a display, a sensor probe extending from the top, and labeled buttons/interfaces.

4. MEASUREMENT PROCEDURE

1. Press the power key [⚙️] to switch on the power. The gauge enters the auto mode which can automatically test the water activity.
2. Place the samples into the sample plate, and then cover the sensor of the gauge onto the sample plate. Lay aside for about 5 minutes. When the reading gets stable, the water activity can be obtained.
3. Measurement time varies:
   • When the water activity is greater than 0.8 or less than 0.3, the measurement time is within 20 minutes.
   • When the water activity is greater than 0.95 or less than 0.1, the measurement time is more than 1 hour (because the measurement must wait until the moisture and air in the measurement room are completely mixed). The instrument has a horn sound [?] every five minutes.

5. CONNECTING WITH A COMPUTER

1. Install the USB software on your PC. Always click the "continue" button in the installing process.
2. Connect your gauge to your PC using the optional cable.
3. Switch on your gauge and ensure the Reading Screen is displayed.
4. Start the software and follow the instructions included with the software Demo.EXE.

6. READING CORRECTION

1. When it is necessary to correct the reading value, press and hold the Power Key [⚙️] for about 7 seconds. Then release the key when the signal 'Cor' comes out on the display. There will be a decimal number with two places, which is the correction value.
2. Then open the battery cover on the back. There are 2 small holes below the battery slot. Use a small hard bar (such as a screwdriver [?]) to slightly touch the key inside. The correction value will be increased or decreased. The value increases when touching the right hole, while the value decreases when touching the left hole. Each time the key is touched, the correction value changes by 0.01. The correction value can be set from -0.05 to 0.05.
3. After the adjustment, press the Power Key [⚙️] to quit.

7. BATTERY REPLACEMENT

1. When it is necessary to replace the battery, the battery symbol [?] will appear on the Display.
2. Slide the Battery Cover away from the instrument and remove the batteries.
3. Install the batteries (2x1.5v AAA Um-4) correctly into the case.
4. If the gauge is not to be used for any extended period, remove batteries.

8. OPERATION PROCEDURE

1. Take out the instrument. Diagram shows the water activity meter and a vessel dish.
2. Open the instrument measuring room. Diagram shows the water activity meter with its lid open.
3. Open the container dish and put the test sample into the container dish. Diagram shows a container dish and a sample being placed into it.
4. Put the container dish with sample into the bottom box of the measuring chamber (do not cover the container dish). Diagram shows the bottom part of the measuring chamber and the container dish with sample being placed inside.
5. Start the instrument and combine the measuring chamber. Diagram shows the water activity meter being closed.
6. Check whether the measuring room has anastomosis. After the anastomosis, the measurement begins. Diagram shows the water activity meter closed, displaying a reading of 0.75.

FCC Compliance Information

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

• (1) this device may not cause harmful interference, and
• (2) this device must accept any interference received, including interference that may cause undesired operation.

Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.