Introduction
The Benetech GM100 Digital Ultrasonic Thickness Gauge Meter is a precision instrument designed for fast and accurate measurement of various materials. It utilizes ultrasonic waves to determine the thickness of metal and non-metal objects, including steel, aluminum, zinc, gold, glass, and many others. This manual provides comprehensive instructions for the proper setup, operation, and maintenance of your GM100 device to ensure optimal performance and longevity.
Figure 1: The Benetech GM100 Digital Ultrasonic Thickness Gauge Meter with its connected probe, ready for use.
Figure 2: An overview of the GM100's key features, highlighting its automatic calibration, sound velocity detection, data storage, and power management capabilities.
Setup and Initial Preparation
1. Battery Installation
The GM100 requires three AAA batteries for operation. Ensure correct polarity when inserting the batteries into the compartment located on the back of the device.
- Open the battery cover on the rear of the unit.
- Insert 3 AAA batteries, observing the polarity markings (+/-).
- Close the battery cover securely.
Figure 3: Illustration of the GM100's battery compartment, emphasizing its long battery life of up to 100 hours with AAA batteries.
2. Probe Connection
Connect the ultrasonic probe to the designated ports on the top of the GM100 unit. Ensure the connectors are firmly seated.
3. Applying Coupling Fluid
A coupling fluid (gel) is essential for accurate measurements. It facilitates the transmission of ultrasonic waves between the probe and the material being measured. Apply a small amount of coupling fluid to the surface of the material where the probe will be placed.
- Ensure the measurement surface is clean and free of debris.
- Apply a small drop of coupling gel to the surface.
- Press the probe firmly onto the gelled surface to ensure good contact.
Operating Instructions
1. Power On/Off
Press the Power button (
) to turn the device on. The device will automatically power off after a period of inactivity to conserve battery life.
2. Calibration
Before taking measurements, it is recommended to calibrate the device using the built-in metal calibration block or the included 4mm calibration block.
- Apply coupling fluid to the calibration block.
- Press the probe firmly onto the calibration block.
- Press the CAL button () to perform zero-point calibration. The device will automatically adjust to correct system errors.
3. Measuring Thickness
Once calibrated, apply coupling fluid to the material surface and press the probe firmly against it. The thickness reading will appear on the LED backlit screen. The device measures in both inches and millimeters.
Figure 4: The GM100 being used to measure the thickness of a large metal structure, demonstrating its portability and ease of use in various environments.
4. Adjusting Sound Velocity (VEL)
Different materials have different sound velocities. For accurate measurements, adjust the sound velocity setting to match the material being tested. The GM100 allows adjustment from 1000 to 9999 m/s.
- Press the VEL button () to enter sound velocity adjustment mode.
- Use the arrow keys ( / ) to increase or decrease the value.
- Refer to the material sound velocity table below for common materials.
- The device also supports a reverse measurement ability: if you have a material sample of known thickness but unknown type, you can input the thickness, and the unit will derive the sound velocity, allowing you to identify the material or measure other items of the same type.
Figure 5: A comprehensive table listing common materials and their corresponding sound velocities (m/s), crucial for accurate measurements with the GM100.
5. Data Storage and Recall
The GM100 can store up to 10 thickness values and 12 sound velocity values.
- To store a reading, press the STORE button ().
- To recall stored data, use the Function Switch Key () and arrow keys to navigate through the memory slots.
Figure 6: Detailed diagram of the GM100's display icons and button functions, serving as a quick reference for operation.
Maintenance
1. Cleaning
After each use, wipe the probe and the device's surface with a soft, dry cloth to remove any residual coupling fluid or dirt. Do not use abrasive cleaners or solvents.
2. Storage
Store the GM100 in its protective case in a cool, dry place when not in use. Remove batteries if the device will not be used for an extended period to prevent leakage.
3. Coupling Fluid
Ensure you have an adequate supply of ultrasonic coupling gel. The device will not function correctly without it. Replacements can be sourced from reputable suppliers.
Troubleshooting
If you encounter issues with your GM100, refer to the following common problems and solutions:
- No Reading or Erratic Readings:
- Ensure sufficient coupling fluid is applied and there are no air bubbles.
- Verify the probe is pressed firmly and evenly against the surface.
- Check if the material surface is too rough or has non-parallel top and bottom surfaces (see Figure 5 reminders).
- Confirm the material is an ultrasonic wave conductor.
- Inaccurate Readings:
- Perform a calibration using the included calibration block.
- Verify the correct sound velocity for the material is selected.
- Ensure the material is not at an extremely high temperature, which can affect readings (see Figure 5 reminders).
- Device Does Not Power On:
- Check battery installation and ensure batteries are not depleted. Replace if necessary.
- Sound Velocity Readout Issues:
- While the device is designed to allow sound velocity measurement for unknown materials, ensure you are following the specific steps outlined in the operating instructions for this advanced function.
Specifications
Figure 7: Visual representation of the GM100's high precision measurement capabilities, including its sound velocity range, frequency, resolution, and accuracy.
| Feature | Detail |
|---|---|
| Measuring Range | 1.2 to 225 mm (0.047 to 8.85 inches) |
| Lower Limit of Pipe Measure | Φ20x3mm / 0.118 inch (steel) |
| Resolution | 0.1 mm / 0.01 mm (selectable) |
| Accuracy | ±(1%H + 0.1mm) |
| Sound Velocity Range | 1000 to 9999 m/s |
| Operating Frequency | 5 MHz |
| Data Storage | 10 thickness values, 12 sound velocity values |
| Display | LED Backlit Screen |
| Power Supply | 3 x AAA Batteries (included) |
| Battery Life | Approx. 100 hours (working ≤50mA) |
| Dimensions | 125 x 55 x 29 mm |
| Weight | 114.5 g (without batteries) |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
Warranty and Support
The Benetech GM100 Digital Ultrasonic Thickness Gauge Meter comes with a 12-month warranty from the date of purchase, covering manufacturing defects. For any technical assistance, troubleshooting, or warranty claims, please contact our dedicated customer service team. We offer friendly 24/7 professional customer service to assist you with any inquiries.
For support, please refer to the contact information provided with your product packaging or visit the official Benetech website.
