Elcometer 456 Model E - Calibration Method Details

Method
Description Icon Model
Zero
A simple method for calibrating on smooth
substrates. Simply place the probe on th
e
uncoated metal and the gauge will adjust
the
calibration accordingly. Also known as the
single
point calibration method.
BST
Smooth
This is a more accurate method of calibrating
the
gauge than the Zero method as it requires
the
user to calibrate the gauge using a foil and
the
un-coated substrate.
The gauge’s on-screen calibration
instructions
will guide the user through the calibration
routine.
When selecting the foil value, the user
should
choose a thickness that is close to but
greater
than the expected dry film thickness value.
BST
Rough /
2 Point
Ideal for calibrating the gauge on both
profiled
metal substrates (when the uncoated surface
is
accessable) and substrates where there
are
significant differences in the magnetic (F)
or
electrical (N) properties of the substrate.
For
example cast iron, high carbon steel or
some
non-magnetic stainless steel alloys.
The calibration requires 2 foil values - one
above
the expected dry film thickness, and one below.
The gauge will guide the user through th
e
process with on screen instructions.
EBST
Zero Offset
This is the ISO 19840 method for coatings on
steel surfaces roughened by blast cleaning
or
when the substrate profile is unknown, or
not
accessible. The calibration uses the smoot
h
surface technique, and a correction value
(zero
offset) is applied to each reading to account
for
the effect of the roughened surface; the value
of
the offset depends on the initial surface
profile
and is described in ISO 19840 as follows:
ST
Profile according to
ISO 8503-1
Correction Offset
*
Value µm (mils )
Fine
10 (0.4)
Medium
25 (1.0)
Coarse
40 (1.6)
* mils values are calculated and for reference
as ISO 19840 indicates metric units only
www.elcometer.com
19
en
R
456 Dry Film Thickness Gauge
20 of 89For more information / 1300 287 935
mail@burwell.com.au / www.burwell.com.au