Checkline PT-UTG Instrukcja Użytkownika Pobierz pdf (Strona 3)

To disconne

ct a

pro

be from

body,

powe

r-dow

n the

ins

trum

ent an

d slide

the

plastic probe

conn

ecto

horizo

ntally (in the direction of the arro

w) a

way from

the

body. R

everse the

se steps to attach a n

ew probe.

hen

pow

ered-up

the

osiTector

autom

atica

lly

ete

es what typ

e of probe

is attache

d and doe

s a

lf-ch

eck.

Probes

PosiTector UTG probes transmit an ultrasonic pulse into the

material to be measured. This pulse travels through the material

towards the other side. When it encounters an interface such as air

(back wall) or another material, the pulse is reflected back to the

probe. The time required for the pulse to propogate through the

material is measured by the Gage, represented as t

and t

below.

PosiTector UTGC and UTGM (in single-echo mode) probes

determine thickness by measuring t

(uncoated) or t

(coated),

dividing it by two and then multiplying by the velocity of sound for

that material (steel). See Figure 1.

For uncoated materials t

relates directly to material thickness.

When a material is coated the propagation time is increased and

is shown above as t

Coatings such as paint have a slower velocity of sound than that

of metal. Thus the single-echo technique will produce a thickness

result greater than the actual combined coating+metal thickness.

steel

coating

steel

Figure 1

Probe

1 2 3 4 5 6 7 8 ... 12 13

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