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Transistor ultrasonic thickness gauge type 1103

A direct-reading ultrasonic thickness gauge which requires access to only one side of the material and has been specially developed for applications where a very high degree of portability is essential.

Features:

Direct-reading scale.

Range 0.09 in. to 5 in.

Compact lightweight all-transistor design.

Simple operation.

Suitable for flat and convex sur­faces.

Visible and audible resonance in­dication.

Application: The Transistor Ultrasonic Thickness Gauge Type 1103 is especially suitable for work which requires rapid and simple non­-destructive measurement of material thickness in awkward locations and to which there is access to one side only. Such applications include corrosion studies and flaw detection on ship hulls and decking, and on piping, tanks and pressure vessels in the oil, chemical and nuclear power industries.

Special features of the Type 1103 are its compact ultra-lightweight design and its direct meter indication of thickness. The material se­lector switch gives immediate readings with steel, aluminium and cop­per. Other materials, including most metals, glass, plastics and ce­ramics can be tested by using the undesignated switch position and calibrating on a known thickness of the material.

In applications where measurement outside the range 0.09 in. to 5 in. is required or where accuracy greater than 3 to 5% is necessary, the use of alternative instruments is recommended. The Ultrasonic Thickness Gauges Type 1101 and 1101/1 provide ranges of 0.06 in. to 12 in. and 0.02 in. to 4.0 in. respectively with accuracies of 1% to 3%. The Vistgauge Type 1108 provides cathode ray tube direct measurement of thickness from 0.006 in. to 1.8 in. with accuracies from 0.1% to 2%.

Design: The equipment consists of an all-transistor oscillator which generates waves at frequencies variable between 2 and 4 Mc/s. The piezo-electric transducer converts the waveform into mechanical vibra­tions and transmits them into the workpiece. The vibration frequen­cies are varied by means of the oscillator tuning dial, and frequencies at which resonance occurs in the workpiece are found by noting the ac­companying increases in the headphone audio signal and in the output meter deflection. In a given material the resonant frequencies are di­rectly related to the thickness, and values from 0.09 in. to 5 in. can be read directly on the large indicating meter.

The standard flat surface transducer is suitable for use on flat, cylindrical and compound curved surfaces down to 2 in. overall diam­eter or 12 in. internal diameter. Concave transducers are available for use on smaller convex surfaces.

The stable all-transistor oscillator and meter circuits are battery powered. A battery check is provided on the indicating meter, and the typical battery life is 80 hours continuous operation, or 2 to 4 months of normal use.