REED Instruments TM-8811-NIST Ultrasonic Thickness Gauge User Manual

1. Introduction

This manual provides comprehensive instructions for the safe and effective operation, maintenance, and troubleshooting of the REED Instruments TM-8811-NIST Ultrasonic Thickness Gauge. This device is designed for precise measurement of material thickness using ultrasonic technology. Please read this manual thoroughly before using the instrument.

2. Safety Information

Observe the following safety precautions to prevent injury and avoid damage to the instrument:

• Do not operate the gauge in explosive atmospheres.
• Ensure proper coupling between the probe and the test material for accurate readings.
• Avoid dropping the instrument or subjecting it to severe impact.
• Do not attempt to disassemble or repair the instrument yourself. Refer to qualified service personnel.
• Keep the instrument dry and clean.
• Use only the specified battery type.

3. Product Overview

The REED Instruments TM-8811-NIST is an ultrasonic thickness gauge designed for quick and accurate measurements. It features a large LCD display and intuitive controls.

Figure 1: REED Instruments TM-8811-NIST Ultrasonic Thickness Gauge and a sample calibration certificate.

This image displays the REED Instruments TM-8811-NIST Ultrasonic Thickness Gauge, a blue handheld device with a digital display showing "0.000". Two probes are connected to the top of the device via cables. Below the display are several control buttons: a red power button (circle with a vertical line), "SELECT", "CAL", "VEL", "mm/inch", and up/down arrow buttons. The text "Ultrasonic Thickness Gauge" and "COUPLING" are visible on the device face. Partially visible in the background is a "CALIBRATION CERTIFICATE" document, indicating the importance of calibration for such instruments.

Key Components:

• LCD Display: Shows thickness readings and other operational information.
• Probe Connectors: For attaching the ultrasonic probes.
• Power Button (⑂): Turns the device on or off.
• SELECT Button: Used to navigate menus or confirm selections.
• CAL Button: Initiates or adjusts calibration settings.
• VEL Button: Allows adjustment of the sound velocity for different materials.
• mm/inch Button: Toggles between metric (mm) and imperial (inch) units.
• Up/Down Arrow Buttons: Used for adjusting values or navigating menus.

4. Setup

1. Battery Installation: Open the battery compartment (typically on the back) and insert the required batteries, observing correct polarity. Close the compartment securely.
2. Probe Connection: Connect the ultrasonic probe(s) to the connectors at the top of the gauge. Ensure a firm connection.
3. Power On: Press the ⑂ Power button to turn on the device. The display will illuminate.

5. Operating Instructions

5.1 Basic Measurement

1. Prepare Surface: Ensure the surface of the material to be measured is clean, smooth, and free of rust, paint, or debris.
2. Apply Couplant: Apply a small amount of ultrasonic couplant (e.g., glycerin, gel) to the surface where the measurement will be taken. This ensures proper sound transmission.
3. Place Probe: Press the probe firmly and flatly against the prepared surface. The "COUPLING" indicator on the display should appear, confirming good contact.
4. Read Measurement: The thickness reading will be displayed on the LCD. If the reading is unstable, adjust the probe position or reapply couplant.
5. Remove Probe: Lift the probe from the surface. The reading will typically hold or return to zero.

5.2 Unit Selection (mm/inch)

Press the mm/inch button to toggle between millimeters (mm) and inches (inch) for the displayed thickness measurement.

5.3 Sound Velocity Adjustment

The accuracy of ultrasonic thickness measurement depends on the correct sound velocity setting for the material being tested. Refer to a material velocity chart for common materials.

1. Press the VEL button. The current sound velocity value will be displayed.
2. Use the Up and Down arrow buttons to adjust the velocity to the desired value for your material.
3. Press VEL again or SELECT to confirm and exit velocity adjustment mode.

6. Calibration

The TM-8811-NIST gauge is factory calibrated. However, periodic calibration checks and adjustments are crucial for maintaining measurement accuracy, especially when measuring different materials or after prolonged use. The device may feature a built-in calibration block or require external reference standards.

6.1 Zero Calibration

Zero calibration compensates for the probe delay line. This is typically performed by placing the probe on a known thickness standard or by coupling the probe to itself (if applicable to the probe type).

1. Ensure the probe is clean and free of couplant.
2. Press the CAL button. Follow the on-screen prompts.
3. Place the probe on the zero calibration block or perform the specified zeroing procedure.
4. Confirm the calibration.

6.2 Two-Point Calibration

For enhanced accuracy, especially over a range of thicknesses, a two-point calibration using two known thickness standards (e.g., thin and thick) is recommended.

1. Press the CAL button and select the two-point calibration option.
2. Measure the first known thickness standard and input its value using the arrow buttons.
3. Measure the second known thickness standard and input its value.
4. Confirm the calibration.

Always refer to the specific instructions in the device's internal menu for detailed calibration procedures.

7. Maintenance

• Cleaning: Wipe the instrument and probes with a soft, dry cloth after each use. Do not use abrasive cleaners or solvents.
• Storage: Store the gauge in its protective case in a cool, dry place when not in use. Remove batteries if storing for extended periods to prevent leakage.
• Battery Replacement: Replace batteries when the low battery indicator appears on the display.
• Probe Care: Inspect probes regularly for wear or damage. Replace damaged probes to ensure accurate measurements.

8. Troubleshooting

9. Specifications

• Model: TM-8811-NIST
• Brand: REED Instruments
• Measurement Range: Up to 7.9" (200mm)
• Display: Large LCD
• Accuracy: High accuracy
• Units: Millimeters (mm) / Inches (inch)
• Power Source: (Typically batteries, specific type not provided, so keep general)
• Item Weight: 1 Pounds

10. Warranty and Support

REED Instruments products are designed for reliability and performance. For information regarding warranty coverage, technical support, or service, please refer to the official REED Instruments website or contact their customer service department. Keep your purchase receipt as proof of purchase for warranty claims.

Manufacturer: REED Instruments

Date First Available: July 10, 2017