Transport; Recurring Inspections; Measuring Prerequisites - Pfeifer Messschieber 40 Manual

7. Transport

Transport the measuring device in the provided case
(measuring instrument case, carry case).
Severe vibrations and knocks should be avoided during
transportation.
The device is to be kept away from strong electromag-
netic sources.
During transportation, the measuring instrument should
be protected from moisture, contamination and tempe-
ratures beyond the storage temperature.

8. Recurring inspections

Before each measurement, it should be checked that the
measuring instrument is zeroed correctly in accordance
with Section 5.
It is recommended to calibrate the PFEIFER rope calliper
gauge every 12 months at the latest (does not apply to
PFEIFER rope calliper gauge 125) according to VDI 2618
(or equivalent national standards).

9. Measuring prerequisites

WHEN?
A distinction is made between different times/statuses
in the rope's product life cycle and hence reasons for
performing a measurement of the rope diameter. Depen-
ding on the status, different approaches and measuring
accuracies/tolerances are required.
• New ropes, diameter inspection during rope production,
goods outwards inspection at the manufacturer or
incoming goods inspection before commissioning:
Perform the measurement in a completely unloa-
ded state. The actual rope diameter or the diameter
tolerance compared to the nominal rope diameter
is defined in this state. For ropes with the highest
requirements in multi-layer winding (e. g. tolerance
field width ≤ 2 % points), it is recommended to use
Fig. 1: Measuring the circumference diameter
PFEIFER rope calliper gauge 01/2022 / Subject to change!
6
d
m
the PFEIFER rope calliper gauge 60 or PFEIFER rope
calliper gauge 125.
• Ropes in operation, to determine the wear status and
the discarding time:
The diameter can be measured according to EN 12385-1
at a strand tension up to 5 % of the rope's minimum
breaking force. As a rule, the maximum string tension of
5 % can be complied with when the system is load-free
(e. g. empty hook block/traverse) and can be achieved
without great effort. It is recommended to perform the
reference measurement in a new condition (directly after
being laid) and to do all following measurements over
the rope's life cycle in the same load condition.
HOW?
To determine the actual diameter of a wire rope, measure
the diameter dm of the circumference, Fig. 2, according to
DIN EN 12385-1.
For the measurement, it is recommended to place the
caliper across several outer strands, which is ensured
by using the PFEIFER rope calliper gauge.
Select the appropriate procedure depending on the
timing or objective of the measurement.
• On new ropes (see definition in the previous section),
measure two measuring points that are at least one
metre apart from each other. Furthermore, don't
measure closer than 2 m from a rope end or rope end
connection, as, depending on the end processing, the
rope structure may not be representative there, Fig. 3.
• On ropes in operation, diameter measurements must
be done along the entire length. Without precise
knowledge of the rope drive, an even distribution of
the measuring points along the entire length is re-
commended. In this case, the first and last measuring
point shouldn't closer than 2 m from a rope end or
rope end connection. With more precise knowledge
of the rope drive (highest number of bending cycles),
the working method (e. g. storage/retrieval points with
load peaks) and the wear behaviour (e. g. derived
from the wear behaviour of the previously discarded
ropes), the measurement must be done evenly distri-
buted at the rope zones under greatest stress.