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2.1.10 The thickness gauge weight with one piezoelectric transducer (without
spare parts, accessories and bag) is no more than 0.176 kg.
2.2
Specifications
2.2.1 The limits of allowable basic absolute error for thickness measurement
are ± (0.03 + 0.002·Hx) mm, where Hx is a numeric thickness value expressed in
millimeters.
2.2.2 The limits of allowable relative error for ultrasound propagation velocity
measurement are ± 1.5 % of the measured value.
2.2.3 The limits of allowable complementary error of the thickness gauge for
thickness measurement, which occurs due to the variation of ambient temperature
by every 10 °С from the temperature range limits (20 ± 5) °С in the operating
temperature interval are ± 0.5·Δ
measurement error expressed in mm.
2.2.4 The limits of allowable complementary error of the thickness gauge for
thickness measurement from a rough surface side, which occurs due to the surface
roughness R
= 40 µm, are no more than ± 0.5·Δ
z
2.2.5 The limits of allowable complementary error of the thickness gauge,
occurred due to the surface roughness R
.187" 10 MHz transducers, and R
during the thickness measurement from a smooth surface side, are no more than
± 0.5·Δ
.
Н
2.2.6 The limits of allowable complementary error of the thickness gauge for
measuring the thickness of curved surfaces with the curvature radius of 10 mm for
.187" 7.5 MHz, .250" 7.5 MHz transducers, and curvature radius of 20 mm for
.250" 5 MHz, .187" 10 MHz transducers, are ± 0,5·Δ
2.2.7 The limits of allowable complementary error of the thickness gauge for
measuring the thickness of nonparallel surfaces with the out-of-parallelism of 3 mm
on the reference length of 20 mm, are ± 0,5·Δ
and ± (0.2 + 0.01Hx) mm, where Hx is a numeric thickness value expressed in
millimeters, in the range from 10 to 50 mm.
2.2.8 When operated, the thickness gauge is resistant to the effect of the
following climatic factors:
― ambient air temperature from - 20 to + 50 °С;
― relative air humidity up to 95 % at 35 °С, without condensation;
― atmospheric pressure from 84 to 106.7 kPa.
2.2.9 The degree of thickness gauge case protection against the ingress of
solids and water corresponds to IР64.
, where ΔН is a value of absolute thickness
Н
.
Н
= 160 µm for .187" 7.5 MHz, .500" 5 MHz,
z
= 80 µm for .250" 5 MHz, .250" 7.5 MHz transducers
z
, mm, in the range from 1 to 10 mm,
Н
4
.
Н
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