Touchstone™ 1 Ultrasonic Thickness Gauge

Overview of the Touchstone 1 ultrasonic thickness gauge

The Touchstone 1 is a high performance UT gauge, low cost, simple to use handheld thickness gauge, often known as an ultrasonic thickness gage in the USA, or an ultrasonic wall thickness gauge. It is suitable for use in a variety of applications in NDT (non-destructive testing) and is capable of measuring most engineering materials including plastic, glass, copper, cast iron and aluminium as well as a wide range of steels. The Touchstone 1 is simple to calibrate and operate and produces accurate and reproducible results.

The Touchstone 1 ultrasonic thickness gage is widely used in the marine industry by marine surveyors and CLASS surveyors. Ultrasonic thickness testing in quality control during manufacturing and as an inspection tool to measure remaining wall thickness of materials subject to erosion and corrosion.

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Touchstone 1 Applications

  • Shipping
  • Offshore
  • Oil and Gas
  • Storage tanks
  • Pipelines
  • Bridges
  • Road tankers
  • Lighting column

The complete Touchstone 1 thickness tester kit includes:

  • Touchstone 1 thickness gauge
  • with embedded stainless 5mm calibration block
  • Ultrasonic sensor
  • 125ml bottle of couplant
  • Full operating instructions
  • 2 x 9v PP3 batteries
  • Foam-lined black polymer carry case

Touchstone 1 Technical Specifications

Thickness range: 1.0 to 199.9mm
Resolution:  0.1mm
Accuracy: ±0.1mm
Velocity Adjustment:  0 to 999metres/sec
Display:  12.5mm high LCD screen
Features:  back light auto shut off after 3 minutes in robust casing waterproof to IP66
Sensor: 5 MHz ultrasonic thickness
Unit Dimensions: 132 x 82 x 33mm
Unit Weight: 250g
Temperature Range: -10ºC to +50ºC
Power Supply: 1 x 9v PP3 battery
Battery Life:  40 hours nominal with a PP3 alkaline battery
Carry Case Dimensions: 220 x 200 x 80mm
Operational Weight:  326g
Shipping weight: 750g

1. Calibrate the sensor using the inbuilt calibration block.

2. Identify substance to be measured.

3. Use the Sound Velocity Table to ascertain the relevant speed of sound for the substance.

4. Use the up and down velocity arrows to set the required speed.

5. Place couplant on the substance being tested and press the sensor down.  The thickness will be displayed.

Class Instrumentation Ltd Ultrasonic Sound Velocity Table

 

A sound velocity table is a list of the speed of sound in various materials.  This information is necessary to have when using our Touchstone 1 ultrasonic thickness gauge, as the speed the ultrasound will move through the material in question needs to be programmed into the gauge to obtain an accurate thickness reading.

All velocities in this sound velocity table are approximations:

Material Sound Velocity Inch/µSecond Metres/second
Air 0.013 330
Aluminium 0.250 6300
Alumina Oxide 0.390 9900
Beryllium 0.510 12900
Boron Carbide 0.430 11000
Brass 0.170 4300
Cadmium 0.110 2800
Copper 0.180 4700
Glass(crown) 0.210 5300
Glycerine 0.075 1900
Gold 0.130 3200
Ice 0.160 4000
Inconel 0.220 5700
Iron 0.230 5900
Iron (cast) 0.180 4600
Lead 0.085 2200
Magnesium 0.230 5800
Mercury 0.057 1400
Molybdenum 0.250 6300
Monel 0.210 5400
Neoprene 0.063 1600
Nickel 0.220 5600
Nylon, 6.6 0.100 2600
Oil (SAE 30) 0.067 1700
Platinum 0.130 3300
Plexiglas 0.110 1700
Polyethylene 0.070 1900
Polystyrene 0.0930 2400
Polyurethane 0.0700 1900
Quartz 0.230 5800
Rubber, Butyl 0.070 1800
Silver 0.140 3600
Steel, Mild 0.230 5920
Steel, Stainless 0.230 5800
Teflon 0.060 1400
Tin 0.130 3300
Titanium 0.240 6100
Tungsten 0.200 5200
Uranium 0.130 3400
Water 0.0584 1480
Zinc 0.170 4200

American Bureau of Shipping Classification Society Manufacturing Process Approval
ISO 9001:2015 Certificate Number 14124458
NATO Stock Number 5220-99-290-7166
NCAGE Number U0B22
CE Mark Directives & Laws 89/336/EEC (Electromagnetic Compatibility)
IIMS Corporate Membership Number C508
NFPA Membership Number 2800960
FPA Membership Number 27135

 

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