over the wide temperature range required by API. The
output sensitivity of conventional eddy current probe
systems typically falls off as temperature increases. A
unique probe winding technique was developed by SKF that
maintains output sensitivity not only over the entire API
specified temperature range, but over an extended range
as well.
“Super tough” eddy current probe systems are thoroughly
field tested and proven, with thousands of units installed.
SKF has been using RYTON
®
in its transducer designs for
many years. RYTON’s strength approaches that of metal.
RYTON
®
is impervious to any solvent at temperatures up to
+400 °F (+205 °C). For this reason, SKF driver housings
are also made of the same super tough material. An
added benefit is there is no longer a need to electrically
isolate drivers during installation to prevent troublesome
ground loops. RYTON’s proven resistance to extreme harsh
environments protects the complex electronics required to
operate eddy current probes. An internal sealing system
of conformal coating protects these components from
moisture ingression and corrosion. This increases system
reliability by eliminating the need to totally encapsulate the
components. Due to unique construction, both the driver
housing and the internal circuits react to severe thermal
excursions at the same rate. This reduces internal stresses
created by routine machinery transients or load changes,
providing for a longer driver life.
SKF drivers are EMI/RFI shielded, and the mounting
scheme allows them to fit the same “footprint” as previous
SKF driver housings, or they can be snapped onto
type C-DIN rails for high density applications and quick
installation. The compression connector for terminating the
power and signal wiring further aids in the ease and cost of
installation. A fixed connector version is also available.
SKF Eddy Current Probe Systems are constantly
temperature and performance tested in a continuing effort
to improve what is already the best probe available for the
measurement of vibration in rotating equipment. They are
available with armored and fiberglass sleeving, and may be
offered SIRA/CSA/FM certified.
SKF Eddy Current Probes are available in a variety of case
mounting configurations and length options to meet difficult
installation requirements.
The small tip diameter (5 mm) of the CMSS 65 Eddy
Current Probe Systems, coupled with the stringent controls
under which they are produced, effectively reduces
calibration error due to shaft curvature. This makes the
Section 1 – General information
1-5
CMSS 65 an exceptional choice for measuring vibration in
small diameter shafts. The CMSS 65 is available in 5 or 10
meter systems (probe with integral cable, or a combination
of probe cable and extension cable) and has a typical
usable range of 10 mils to 90 mils with a 200 mV/mil
sensitivity. A specific CMSS 665 Driver is required for each
of the standard length systems (refer to Table 1-1).
The larger tip diameter (8 mm) of the CMSS 68 SKF Eddy
Current Probe is used for large diameter shafts as well
as long range axial position (thrust) measurements. The
CMSS 68 is available in 5, 10 or 15 meter systems and has
a typical usable range of 10 mils to 100 mils with a
200 mV/mil (7.87 V/mm) sensitivity.
Table 1-5. Temperature conversion table.
Table 1-6. Length conversion table.
To Next Page
