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17 SPARES
Your gauge is complete with all the items required to get started and take measurements
(transducers must be ordered separately). Over the life of the gauge replacement items may be
required. The following replacement and optional items are available from your local Elcometer
NDT supplier or directly from Elcometer NDT.
Description
No.
3.5 MHz 1/2" Potted Top Dual Element Underwater Transducer
5.0 MHz 1/2" Potted Top Dual Element Underwater Transducer
2.25 MHz 1/2" Lemo Single Element Membrane Underwater Transducer
5.00 MHz 1/2" Lemo Single Element Membrane Underwater Transducer
Underwater Gasket Lubricant, 6 g
O-Ring Kit (1 lubricant, 2 gaskets)
Note: A wide range of other transducers and accessories is available - see www.elcometerndt.com
for details.
18 TRANSDUCERS
Your gauge is capable of performing measurements on a wide range of materials, from various
metals to glass and plastics. Different types of material, however, have different properties. The
following paragraphs highlight the important properties of transducers which should be considered
when assessing a particular measurement task.
The best measurement condition is one where sufficient ultrasonic energy is sent into the material
being measured such that a strong, stable echo is received by the gauge.
Several factors affect the strength of ultrasound as it travels. These are outlined below:
18.1 INITIAL SIGNAL STRENGTH
The stronger a signal is to begin with, the stronger its return echo will be. Initial signal strength is
largely a factor of the size of the ultrasound emitter in the transducer. A large emitting area will send
more energy into the material being measured than a small emitting area. Therefore a 6 mm (1/4")
transducer will emit a stronger signal than a 3 mm (1/8") transducer.
18.2 ABSORPTION AND SCATTERING
As ultrasound travels through any material, it is partly absorbed. If the materials through which the
sound travels have any grain structure, the sound waves will experience scattering. Both of these
effects reduce the strength of the waves.
Higher frequency ultrasound is absorbed and scattered more than ultrasound of a lower frequency.
It may seem therefore that using a lower frequency transducer might be better in every instance,
however low frequencies are less directional than high frequencies.
18.3 GEOMETRY OF THE TRANSDUCER
The physical constraints of the measuring environment sometimes determine the suitability of a
transducer for a given job. The transducer may simply be too large to be used in confined areas.
Also, the surface area available for contacting with the transducer may be limited. Measuring on a
curved surface may require the use of a transducer with a matching curved wearface.
Sales Part
TX3M50EP-3
TX5M00EP-8
TX2M25EL-2
TX5M00EL-2
TC-24034-6
TZ-24037
24
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