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.

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

Operating the Touchstone 1 Ultrasonic Thickness Gauge

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.

Sound Velocity Table

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

Touchstone™ 1 in use

Touchstone™ 1 in operation

Accreditations

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