USER MANUAL Coating Thickness Tester With Bluetooth® Model CG304 Additional User Manual Translations available at www.extech.
Introduction Thank you for selecting the Extech CG304 Coating Thickness Tester. The CG304 is a portable meter designed for non-invasive coating thickness measurements with automatic recognition of the material under test. The meter uses two measurement methods: magnetic induction (for ferrous metal substrates) and eddy current (for non-ferrous metal substrates).
Description Meter Description 1. LCD display 2. Power button 3. Sensing Probe 4. Navigation buttons Note: Battery compartment on rear of meter Display Description 1. Data record memory group number 2. Record Number in current memory group 3. Bluetooth icon 4. Automatic (Auto) metal detect mode 5. Battery status icon 6. Measurement units: µm = Micrometers; mils = millimeters * 2.54/100 7. Metal type (FE=ferrous, NFE=non-ferrous) 8. Measurement reading 9.
Operation Meter Power Install two ‘AAA’ 1.5 V batteries into the rear battery compartment. Press the power button to switch the meter ON. The display will switch ON. If the display does not switch ON, install or replace the batteries. When powering up, please keep the meter at least 10cm (4”) from metal objects. Replace the batteries when the battery status icon appears low, the meter will give inaccurate readings if the battery voltage falls very low.
Programming Menu The meter can be configured and calibrated through simple button presses in the programming menu. • Press the LEFT button to access the menu; refer to the menu ‘tree’ below. • Use the UP/DOWN buttons to scroll the menu • Use the LEFT button to select the highlighted mode • Use the RIGHT button to back out of a mode • Other button presses are mode specific, follow on-screen prompts explained below. In the table below the factory default settings are in bold with an asterisk.
MEASURE MODE MENU 1. Press the LEFT button to access the programming menu 2. Use the UP/DOWN buttons to scroll to the Measure Mode 3. Press the LEFT button (SELECT) to select the Measure Mode 4. Use the UP/DOWN buttons to scroll to Auto, FE, or NFE. Press the LEFT button (SELECT) to make a selection. In the AUTO mode, the meter automatically recognizes the metal that is being measured. In the Ferrous (FE) Mode the Magnetic induction measurement mode is used.
Note: Turn on Bluetooth only when necessary as the battery will drain more quickly with Bluetooth powered ON. Press the LEFT button (SELECT) button to confirm and to return to the SET menu (otherwise press the right button [BACK] to abort the edit and return to the SET menu). e. Contrast From the SET menu, scroll to the CONTRAST selection. Press the LEFT button (SELECT) to open CONTRAST. Use the UP and DOWN arrow buttons to adjust the contrast.
CALIBRATION MENU The Calibration menu allows the user to perform a ferrous (Zero F) or non-ferrous (Zero N) ZERO Calibration. The Calibration menu also allows the user to delete ZERO calibration data for both ferrous (Zero F) and non-ferrous (Zero N) modes. 1. Press the LEFT button to access the main menu. 2. Use the DOWN button to scroll to CALIBRATION. 3. Press LEFT (SELECT) to open the CALIBRATION parameter. 4. To perform a ZERO Calibration, refer to Zero Calibration in the next section. 5.
ZERO Calibration Calibration Introduction The meter is factory calibrated before shipment to the customer; however the customer should perform a Zero Calibration before any critical measurements are taken. Preparing for ZERO Calibration 1. Clean the probe tip (grease, oil, metal scrap, and the slightest impurity will affect measurement and will distort readings). 2. Switch the meter ON at a 10 cm (4”) minimum distance from any metal. 3. Ready the supplied metal substrate. 4.
Record Readings in Memory Groups The CG304 offers 50 memory storage groups, Group ‘0’ through ‘50’. Group ‘0’ does not allow data to be stored; it is simply a group that can be selected if readings are to be taken without being stored. Use the UP/DOWN arrow keys to scroll to a particular group. When a reading is taken it is automatically stored in the selected group (except if Group ‘0’ is selected). Each Group can store up to 50 readings (for a total of 2500 for the 50 groups).
FCC COMPLIANCE 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. 2. This device must accept any interference received, including interference that may cause undesired operation. 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.
Error Messages The following error messages will appear on the meter’s LCD if a problem arises. Err1 Eddy current probe error Err2 Magnetic induction probe error Err3 Eddy current and Magnetic induction errors Err4, 5, 6 Unused error displays Err7 Thickness error Please contact Extech Instruments if a problem exists. Maintenance Cleaning and Storage Periodically wipe the meter housing with a damp cloth and mild detergent; do not use abrasives or solvents.
Specifications Ferrous Non-Ferrous Measurement principle Magnetic induction Eddy current principle Measuring range 0~2000μm 0~2000μm 0~78.7mils 0~78.7mils Accuracy1 0~1000μm: ±(2% + 2μm) 0~1000μm: ±(2% + 2μm) (% of reading) 1000μm ~2000μm: (±3.5%) 1000μm ~2000μm: (±3.5%) 0~39.3mils: ±(2% + 0.08mils) 0~39.3mils: ±(2% + 0.08mils) 39.3mils ~78.7mils: (±3.5%) 39.3mils ~78.7mils: (±3.5%) 0~100μm: (0.1μm) 0~100μm: (0.1μm) 100μm ~1000μm: (1μm) 100μm ~1000μm: (1μm) 1000μm ~2000μm: (0.
