FNIRSI CTG-20 Car Paint Coating Thickness Gauge User Manual

1. Introduction

Thank you for choosing the FNIRSI CTG-20 Digital Coating Thickness Gauge. This versatile and high-accuracy device is engineered to precisely measure the thickness of electroplated coatings or paints on both magnetic (ferrous) and non-magnetic (non-ferrous) materials. It utilizes advanced electromagnetic induction and eddy current principles to deliver reliable, fast, and non-destructive results, making it an essential tool for automotive inspections, manufacturing, and quality control.

The CTG-20 is designed for ease of use, featuring a clear display, intuitive controls, and a rechargeable lithium battery for long-lasting operation. Please read this manual thoroughly to understand the device's functions and ensure optimal performance.

2. What's in the Box

Upon opening your FNIRSI CTG-20 package, please verify that all the following components are included:

• 1x FNIRSI CTG-20 Coating Thickness Gauge
• 1x USB Type-C Charging Cable
• 1x Instruction Manual (this document)
• 1x Packaging Box
• Calibration Substrates (Fe and NFe)

Figure 2.1: FNIRSI CTG-20 with its accessories, including the charging cable and calibration substrates.

3. Key Features

• Dual Measurement Capability: Measures paint and coating thickness on both ferrous (steel/iron) and non-ferrous (aluminum) materials.
• Precise & Accurate: Utilizes advanced electromagnetic induction and eddy current principles with a built-in precision probe for highly accurate measurements (Accuracy: ±3% + 2µm).
• High Precision Probe: Equipped with a sensitive probe for automatic recognition of the substrate material.
• User-Friendly & Fast: Provides instant results with minimal setup time, ideal for quick inspections.
• Non-Destructive Testing: Preserves the integrity of the tested surface.
• Rechargeable & Convenient: Powered by a 600mAh lithium battery with built-in Type-C charging, ensuring long-lasting and efficient operation (up to 8 hours on a single charge).
• Wide Application: Suitable for automotive, manufacturing, chemicals, and other industries.
• Data Storage: Supports saving measurement data.
• Rotatable Screen: Display can be rotated for convenient viewing from different angles.
• Putty Powder Test: Supports identification of iron powder putty, providing reassurance for vehicle inspection.
• Auto Power Off: Automatically powers off to conserve battery.

Figure 3.1: The high-precision probe automatically recognizes the substrate material.

Figure 3.2: The device features convenient Type-C direct charging for its built-in lithium battery.

Figure 3.3: The CTG-20 supports metal iron powder putty detection, enhancing vehicle inspection reliability.

4. Setup and Initial Use

4.1 Charging the Device

Before first use, ensure the device is fully charged. Connect the provided USB Type-C charging cable to the CTG-20's charging port and plug the other end into a standard USB power adapter (not included) or a computer's USB port. The battery indicator on the screen will show charging status.

4.2 Powering On/Off

To power on the device, press and hold the power button (usually the central 'MODE' button or a dedicated power button, refer to device markings) until the screen illuminates. To power off, press and hold the same button until the screen turns off, or allow it to auto power off after a period of inactivity.

4.3 Calibration

For accurate measurements, it is crucial to perform calibration regularly, especially before critical measurements or if you suspect inaccuracies. The CTG-20 supports:

• Zero Point Calibration: Place the probe directly on the bare metal substrate (Fe or NFe) without any coating and perform zero calibration as per the on-screen instructions.
• Multi-point Calibration: Use the provided calibration films of known thickness on the bare metal substrate to calibrate at multiple points, ensuring accuracy across the measurement range. Follow the device's menu for multi-point calibration.

Always ensure the probe is clean and free of debris before calibration and measurement.

5. Operating Instructions

5.1 Measurement Principles

The FNIRSI CTG-20 operates on two main principles:

• Electromagnetic Induction (Fe): Used for measuring non-magnetic coatings on magnetic substrates (e.g., paint on steel or iron).
• Eddy Current Principle (NFe): Used for measuring non-conductive coatings on non-magnetic, conductive substrates (e.g., paint on aluminum).

The device automatically detects the substrate type (Fe or NFe) upon contact.

Figure 5.1: The CTG-20 powers on for direct testing and automatically identifies the substrate, providing immediate results.

5.2 Measurement Modes

The CTG-20 offers two primary measurement modes:

• Point Measurement (SNG): For single, precise measurements at specific points. Place the probe firmly and perpendicularly on the surface, wait for the reading to stabilize, and then lift.
• Continuous Measurement (CONT): For scanning a larger area and getting continuous readings. Keep the probe in contact with the surface and slide it smoothly across the area.

Switch between modes using the 'MODE' button on the device.

Figure 5.2: The CTG-20 supports both Point measurement (single point) and Continuous measurement (fast single point) modes.

5.3 Taking a Measurement

1. Ensure the device is powered on and calibrated.
2. Select the desired measurement unit (µm or mil) if applicable via the menu.
3. Gently place the probe perpendicularly onto the surface to be measured. Ensure full contact.
4. The device will automatically detect the substrate and display the coating thickness.
5. For continuous measurement, slide the probe smoothly across the surface.
6. Lift the probe to finalize a point measurement.

5.4 Data Storage and Review

The CTG-20 supports data storage. Press the 'SAVE' button (or equivalent) to save the current measurement. Refer to the device's menu for instructions on how to review stored data.

5.5 Rotatable Screen

The display can be rotated for optimal viewing. This feature is automatically activated or can be toggled via the device settings.

6. Maintenance and Care

6.1 Cleaning

Regularly clean the device, especially the probe, to ensure accurate readings. Use a soft, dry cloth to wipe the body. For the probe, use a soft, lint-free cloth. Do not use abrasive cleaners, solvents, or immerse the device in water.

6.2 Storage

Store the FNIRSI CTG-20 in a cool, dry place, away from direct sunlight, extreme temperatures, and high humidity. The recommended storage temperature is between -10℃ and +50℃, and humidity between 20% - 90% RH. Keep it in its original packaging or a protective case when not in use to prevent damage.

6.3 Battery Care

To prolong the life of the built-in lithium battery, avoid fully discharging it frequently. If the device will not be used for an extended period, charge it to about 50% and store it. Recharge it every few months to prevent deep discharge.

7. Troubleshooting

If you encounter issues with your FNIRSI CTG-20, please refer to the following common problems and solutions:

• Device not turning on:
  - Ensure the battery is charged. Connect the device to a charger and try again.
  - Press and hold the power button for a few seconds.
• Inaccurate readings:
  - Perform zero-point and multi-point calibration as described in Section 4.3.
  - Ensure the probe is clean and free of debris.
  - Make sure the probe is placed perpendicularly and firmly on the surface.
  - Verify that the measurement surface is clean and smooth.
• Screen is blank or frozen:
  - Try restarting the device by holding the power button.
  - If unresponsive, allow the battery to fully drain and then recharge it.
• Device not detecting substrate:
  - Ensure the probe is making full contact with the surface.
  - The surface might be outside the device's measurement capabilities (e.g., non-conductive non-magnetic material).
• Battery drains quickly:
  - Ensure the device is fully charged before use.
  - Reduce screen brightness if possible (check settings).
  - Ensure auto power-off is enabled.

If the problem persists after trying these solutions, please contact FNIRSI customer support or your retailer for further assistance.

8. Technical Specifications

9. Warranty and Support

The FNIRSI CTG-20 Coating Thickness Gauge comes with a standard manufacturer's warranty. For specific warranty terms, duration, and conditions, please refer to the warranty card included with your product or contact your point of purchase. Keep your proof of purchase for warranty claims.

For technical support, troubleshooting assistance beyond what is covered in this manual, or service inquiries, please contact FNIRSI customer support through their official website or the contact information provided by your retailer. When contacting support, please have your product model (CTG-20) and purchase details ready.