Section 5 – Optional equipment
5-1
Section 5
Optional equipment
Introduction
This section explains some of the options used with SKF
Eddy Probe Systems.
CMSS 920 High Pressure
Feedthrough
The SKF Condition Monitoring Model CMSS 920 is a low
cost, general purpose high pressure feedthrough. The
CMSS 920 is principally used to provide a cable exit for
internally mounted eddy probes in high pressure areas.
The unit is available in configurations for one, two, or three
cables and the cable lengths on the high pressure and
low pressure side may be specified as required to meet
particular eddy probe system configurations. The internal
modular construction allows configuration to customer’s
specifications.
The CMSS 920’s bi-directional pressure rating of 2,000 psi
enables the unit to withstand both pressure and vacuum,
a critical requirement for refrigeration units which are
dehumidified under vacuum and pressurized in normal
operation. The 3/4” (19 mm) NPT mounting threads
on either end enables the CMSS 920 to be installed in a
smaller hole.
An optional 1” (25 mm) NPT thread adaptor is available
and may be used to directly replace the previously supplied
CMSS 918 or other high pressure feedthroughs with the
CMSS 920.
Figure 5-1. CMSS 920 High Pressure Feedthrough.
Use the following procedure to install the CMSS 920 High
Pressure Feedthrough.
Remove unit from shipping container. Inspect for 1.
damage to cables during shipping. Use an ohmmeter to
check for continuity.
Be sure the probe and feedthrough cable are compatible 2.
with the driver.
Type your monitor point identification number(s) on 3.
white paper, then cut out in strip(s) approximately 0.25”
(6.4 mm) wide by 2.50” (63.5 mm) long. This size is
usually easy to put under the shrink tubing prior to
shrinking with a heat gun.
Insert identification strips under the clear heat shrink 4.
tubing and then use a heat gun to shrink tubing.
Prepare a 3/4” (19 mm) NPT threaded hole into the 5.
pressure area (through machine casting).
Insert the high pressure cable(s) through NPT hole 6.
and roll both ends of the cable(s) into a fairly tight knot
and secure them with tape or “tie wraps.” This helps
prevent the cables from “snagging” when you screw the
feedthrough into the 3/4” (19 mm) NPT hole.
Screw the high pressure end into the machinery. Wrap 7.
threads with plumber’s Teflon tape if desired.
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