Checkline HP-Textile-Durometer - Manual (Page 4)

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3.0 V ERIFYING C ALIBRAION
3.1 Textile Models (HP-2.5, HP-2.5F, HP-5, HP-5F, HP-10, HP-10F)
The Textile Durometers utilize a 0-100 units scale. The units have not formal
engineering classification and are not related to a specific Shore value or
other known value. These Textile Durometers are designed to obtain objective
comparative values that are effective for classifying the end-product quality.
Therefore, there are no standards that can be used to compare against and it is
for this reason that an NIST-Traceable Calibration Certification can not be
performed.
You can however test that the gauge is functional and un-damaged by press-
ing the flat-bottomed models ("-F" models) against a smooth surface (such as
glass or marble). When fully pressed down, the dial should perform one com-
plete rotation and go back to "0". When released, it should un-coil, and return
to "0" as well. If not, please contact the factory immediately.
On model with a concave base (for measurement on small bobbins or cones),
you can perform a similar "full scale" test using the optional Zero Test Block
(part number HP-TB).
1. Press the Textile Durometer
down on the test plate, which is
available as an accessory and
can be ordered under item
number HP-TB (see Fig. 1).
Do not move the spring-loaded
outer ring.
2. The scale pointer should make
one full turn on the scale, from
zero to zero, when you press
down on the instrument. If it
does not, contact Electromatic
for assistance.
NOTE: Do not loosen the holding screws of the movement under any
circumstances. Loosening these screws may alter the calibration of the
instrument.
Scale
Spring-loaded
outer ring
Color marking
Holding screws
Test block
Part No.: HP-TB
Fig. 1
3.2 Shore Models (HPSA, HPSB, HPSC, HPSD, HPSO, HPDO)
The Shore Durometers model are calibrated against industry standards as
specified in ASTM, DIN and JIS Test Procedures. Calibrated Test Samples
CAN NOT BE USED for verification of the calibration, as these test samples
are subject to change due to temperature, sunlight and other ambient condi-
tions. Certification of the calibration is normally done at test facilities that
can independent test the internal spring forces of the Durometer and check
the travel/reading accuracy of the dial indicator.
Contact factory for the optional NIST-Traceable Calibration Certifications.
1. Press the Shore Durometer
down on a glass plate
(see Fig. 2). Do not move
the spring-loaded outer
ring.
2. The scale pointer should
make one full turn on the
scale, from zero to zero,
when you press down on
the instrument. If it does
not, contact Electromatic
for assistance.
NOTE: Do not loosen the holding screws of the movement under any
circumstances. Loosening these screws may alter the calibration of the
instrument.
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Scale
Glass plate
Spring-loaded
outer ring
Color marking
Holding screws
Fig. 2