Aktek AT300 User Manual - Page 7

Browse online or download pdf User Manual for Measuring Instruments Aktek AT300. Aktek AT300 16 pages. Ultrasonic thickness gauge

Print Page

are visible, as is the barrier separating them. One of the semicircles is responsible for

conducting ultrasonic sound into the material being measured, and the other semicircle is

responsible for conducting the echoed sound back into the transducer. When the transducer

is placed against the material being measured, it is the area directly beneath the center of

the wearface that is being measured.

Right figure is a top view of a typical transducer. Press against the top with the thumb

or index finger to hold the transducer in place. Moderate pressure is sufficient, as it is only

necessary to keep the transducer stationary, and the wearface seated flat against the

surface of the material being measured.

Table 3-1 Transducer Selection

3.2 Condition and Preparation of Surfaces

In any ultrasonic measurement scenario, the shape and roughness of the test surface

are of paramount importance. Rough, uneven surfaces may limit the penetration of

ultrasound through the material, and result in unstable, and therefore unreliable,

measurements. The surface being measured should be clean, and free of any small

particulate matter, rust, or scale. The presence of such obstructions will prevent the

transducer from seating properly against the surface. Often, a wire brush or scraper will be

helpful in cleaning surfaces. In more extreme cases, rotary sanders or grinding wheels may

be used, though care must be taken to prevent surface gouging, which will inhibit proper

transducer coupling.

Extremely rough surfaces, such as the pebble-like finish of some cast iron, will prove

most difficult to measure. These kinds of surfaces act on the sound beam like frosted glass

on light, the beam becomes diffused and scattered in all directions.

In addition to posing obstacles to measurement, rough surfaces contribute to excessive

Model Freq

Diam

Measuring

MHZ

Range

N02

2.5 14

3.0mm～

300.0mm（In

Steel）

40mm (in

Gray Cast

Iron HT200)

N05

5 10

1.2mm～

230.0mm（In

Steel）

N05

5 10

1.2mm～

/90°

230.0mm（In

Steel）

N07

7 6

0.75mm～

80.0mm

（In Steel）

HT5

5 14

3～200mm

（In Steel）

www.aktek.com.tr

Lower

Description

limit

for thick, highly

attenuating, or

highly scattering

materials

Φ20mm

Normal

Measurement

×3.0mm

Φ20mm

Normal

Measurement

×3.0mm

Φ15mm

For thin pipe wall

or small

×2.0mm

curvature pipe

wall

measurement

For high

temperature

(lower than

300℃)

measurement.