skf_cmss900_00_098

skf_cmss900_00_098
Eddy Probe Systems
Catalog
• Probes and drivers
• Mounting devices
• Housings
• Pressure feedthroughs
• Calibrators and simulators
• Accessories
Contents
Overview and introduction for eddy probe systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The versatile eddy probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting an eddy probe system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The SKF brand now stands for more
than ever before, and means more
to you as a valued customer.
While SKF maintains its leadership
as the hallmark of quality bearings
throughout the world, new dimensions
in technical advances, product support
and services have evolved SKF into
a truly solutions-oriented supplier,
creating greater value for customers.
These solutions encompass ways to
bring greater productivity to customers,
not only with breakthrough applicationspecific products, but also through
leading-edge design simulation tools
and consultancy services, plant asset
efficiency maintenance programmes,
and the industry’s most advanced
supply management techniques.
The SKF brand still stands for the very
best in rolling bearings, but it now
stands for much more.
SKF – the knowledge engineering
company
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Eddy probe systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CMSS 65 / CMSS 665 series – 5 mm eddy probe system . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CMSS 68 / CMSS 668 series – 8 mm eddy probe system . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CMSS 62 / CMSS 620 series – 19 mm eddy probe system . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Eddy current probe installation accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 904 probe holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 912 dual axial probe adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 911 probe holder / dual sensor holder with housing . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 920 high pressure feedthrough . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Mounting devices, adapters and packing glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 903 series mounting brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 30112000 series cable packing gland assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 30837800 1/2 or 3/4 in. NPT probe adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Drivers: explosion-proof and weather-proof housings . . . . . . . . . . . . . . . . . . . . . . . . . . 32
CMSS 31091700 explosion-proof housings for DIN-rail mount drivers . . . . . . . . . . . . . . . 32
Weather-proof housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Calibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
CMSS 601 series static calibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Typical eddy probe arrangement plans, bearing housing mounting and axial probe
installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical eddy probe arrangement plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bearing housing mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axial probe installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 mm and 8 mm eddy probe outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 mm and 8 mm eddy probe driver outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19 mm eddy probe outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19 mm eddy probe driver outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 958 extension cable outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CMSS 900 extension cable outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Agency approvals and hazardous area information . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CE mark. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazardous area information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intrinsic safety (I-S) barriers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Classes and divisions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chemicals by groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazardous locations cross reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Industry reference information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comparison of specific non-hazardous applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enclosures for non-hazardous locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
International standards' IP protection classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sources of standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Overview and introduction for eddy
probe systems
Introduction
Eddy probe systems
Effective protection of rotating machinery requires that the proper
type of measurement be performed. The most suitable type of transducer may then be defined. Finally, specific application circumstances
(frequencies of interest, operating temperatures, mounting requirements) are considered to select the optimum transducer. The chart
to the right provides general guidelines for determining the most
effective type of measurement.
Shaft relative motion
Shaft relative motion is the radial vibration of the shaft journal relative to the bearing. This method of vibration measurement is preferred for journal bearings, since it directly relates to permissible
clearances. In machines with relatively light rotors and stiff heavy
casings (turbines and compressors), almost all of the shaft’s vibration
energy is dissipated as displacement (exhibit low transmissibility),
which can only be measured as shaft relative motion.
An eddy probe, mounted to or through the bearing, observes the
shaft to provide this measurement. An additional eddy probe is often
installed 90° from the first, in an orthogonal arrangement, to
increase monitoring and diagnostic capabilities (voting logic and
shaft orbit display).
The eddy probe is used to measure radial or axial shaft motion. It is
mounted through or to the side of a bearing cap and observes the
shaft’s movement relative to its mounting position. An eddy probe
system is comprised of a probe, a driver (oscillator demodulator) and
an extension cable.
Eddy probe systems have excellent frequency response. They have
no lower frequency limit and are used to measure shaft axial position
as well as vibration.
While eddy probe systems offer excellent high frequency response,
displacement at typical blading and gear mesh frequencies is quite
small (an accelerometer may be used to augment the eddy probe
system when high frequencies are a concern).
Frequency considerations
Bearing
type
Rolling element
Sleeve
Typical
characteristics
• High case : rotor weight ratio
• Low transmissibility
• Medium to high damping
• Stiff bearings
• High transmissibility
• Low damping
Typical machines
•
•
•
•
Eddy probes mounted to observe the shaft
Driver
Eddy
probes
Signal out
Driver
• Barrel compressors
• Steam turbines
• Large motors
Small pumps and fans
Small gas turbines
Cooling tower fans
Most general purpose
machinery
Special considerations
• Large gas turbines
• Gearboxes, large fans
• Boiler feed pumps
Casing or bearing cap motion
(accelerometers, velocity
transducers, twin sensors)
Shaft relative motion eddy
probe systems
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Frequency considerations
Shaft relative measurements always use eddy probes and are indicated in terms of displacement. Bearing cap or casing measurements, however, may use accelerometers or velocity transducers,
either of which may be conditioned to indicate in terms of acceleration, velocity or displacement.
The frequency range of interest and the desired measurement
terms are critical factors in transducer selection. Vibration presented
in terms of velocity is generally accepted as a valid indication of
destructive energy across the entire range of frequencies, whereas
displacement and acceleration levels must always be evaluated considering the frequency content.
High frequency measurements (rolling bearings, gear mesh and
blade passage) are best made using an accelerometer and presented
in terms of acceleration, which is typically strong at these frequencies.
Low frequency (less than 15 Hz) bearing cap vibrations need special treatment. The frequency response of most reasonably priced
velocity transducers starts dropping off between 10 and 20 Hz, and
although accelerometers commonly respond down to 3 Hz, acceleration is very weak at low frequencies. The best solution is to integrate
the accelerometer’s signal to read out in terms of velocity. Double
integration to displacement would provide the strongest signal, but,
except in very special cases, it is inadvisable because of significant
low frequency instability associated with the integration process.
Note: Eddy probe, displacement probe and proximity probe are all synonyms
for the similar products manufactured and supplied by various companies.
The versatile eddy probe
The eddy probe system is a field proven method for reliably detecting
various machine displacement parameters. The probe’s simplicity
and rugged design enables it to withstand the temperatures and
chemicals typically encountered in the harsh machine environment.
Eddy probe tip
Flat “pancake”
coil
Varying gap
Magnetic
field
Target
How it works
The tip of the eddy probe contains an encapsulated wire coil that
radiates the driver’s high frequency signal into the observed target as
a magnetic field. The driver outputs a DC voltage representing the
field strength. As a conductive surface approaches the coil, eddy currents are generated on the target surface, which decreases the field’s
strength, resulting in a decrease of the driver’s DC output.
The driver linearizes and normalizes its output to a specific sensitivity, usually 7,87 mV/μm (200 mV/mil), throughout its working
range. The signal’s DC bias, representing the average probe gap, and
its AC component, profiling surface movement and irregularities, is
readily used in many applications, some of which are shown in the
following diagrams.
Radial motion of rotating shafts
Shaft vibration is represented as a varying DC voltage that may be
used for monitoring, balancing or analysis. Using two probes separated by 90°, shaft orbit may be derived and X-Y voting logic monitoring may be used.
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The eddy probe is rigidly mounted to the machine case and observes
a ramped section of the shaft or a perpendicular shaft collar. The DC
output voltage represents the axial shaft position and varies as the
shaft and/or case experience thermal movement. Differential
expansion monitoring confirms acceptable rotor/case growth rates.
Differential expansion
As the eddy probe observes the passage of a hole or keyway on a
shaft or collar, the driver outputs a voltage pulse. This pulse may be
used to generate a speed display or, along with vibration data, it can
also be used to perform dynamic balancing. Multiple events per revolution (such as a gear) may also be observed by the eddy probe for
speed determination.
Key phasor/speed
Shaft axial (thrust) position is represented by the average DC voltage
and is normally used for monitoring. Two probes are recommended
to permit voting protection (especially on systems armed for
automatic shutdown).
Axial (thrust) position
As the piston rings, rider rings and cylinder liners wear, allowing the
rod to gradually drop, the probe gap widens. The driver's DC voltage
output may be used to determine when rings should be turned/
replaced before damage to the piston occurs.
Rod drop
5
Selecting an eddy probe system
A wide variety of SKF systems are offered to meet the requirements
of virtually any application. Probe range is limited largely by the
probe’s diameter. The standard SKF probe diameters are 5 mm
(0.20 in.) (CMSS 65), 8 mm (0.31 in.) (CMSS 68) and 19 mm
(0.75 in.) (CMSS 62). The following should be considered when
selecting a system.
Range
Range is the gap over which the system must accurately operate.
Sensitivity
Certification
Approved probes and drivers can be
supplied with either non-incendive
or intrinsic safety approvals. Nonincendive products are supplied
with FM (Factory Mutual) certification tags attached. Intrinsically safe
products are supplied with triple
agency approval certification tags
attached (ATEX [Sira], FM [Factory
Mutual Systems] and CSA [Canadian Standards Association]).
Certifications
ATEX (Sira)
FM (Factory Mutual Systems)
CSA (Canadian Standards
Association)
CE mark
System length
Beginning January 1996, the European Community requires equipment sold in their area to be a CE
marked product. Because sensors have an active component, such
as the integrated circuit amplifier, the sensor should have the CE
mark.
The physical length of the systems is approximate to the electrical
length. Excess cable in certain installations is typically coiled and tied
with no harmful effects.
A word about …
Must be compatible with monitors or other companion instruments.
Probe case
Probe tips
Some eddy probe options
SKF uses Ryton for eddy probe tips because it is simply the best
material for the job. Ryton has high dimensional stability, reducing
probe coil shape variations with temperature and humidity and
maintaining system accuracy, linearity and resolution. Ryton is a
“super plastic” that has no known solvent below 205 °C (400 °F) and
therefore highly resistant to the acids, bases and solvents handled by
process machinery.
Armor
Installation
A flexible stainless steel jacket protects the cable. It is recommended
when the cable is not protected by conduit. It is available on probe
cables and extension cables, but is not compatible with cable packing
glands.
Major considerations include temperatures, pressures and mechanical stress to which the probe, driver and cables are subjected. It is
essential that the probe be rigidly mounted, yet easily adjusted (SKF
mounting accessories are ideal for this). If long cable runs between
the driver and monitor are required, consult table 1 to determine the
maximum recommended wire length (use three-conductor shielded
wire).
The size of the probe mounting case may be a factor in some installations (several case options are available, indicated under ordering
information).
Table 1
Maximum recommended wire length
6
Wire size (AWG)
Distance (maximum)
22
20
18
16
150 m (500 ft.)
300 m (1 000 ft.)
600 m (2 000 ft.)
900 m (3 000 ft.)
System response varies with the target material
Outputs (V DC)
–22
–16
–10
–8
–4
API Standard 670
The American Petroleum Institute has published Standard 670 as an
aid to the procurement of standardized non-contacting vibration,
axial position and temperature monitoring systems. The standard is
based on the accumulated knowledge and experience of petroleum
refiners and monitoring system manufacturers. API Standard 670 is
a valuable reference tool for all machinery users and manufacturers
and is highly recommended as a guide for defining, purchasing and
installing machinery monitoring systems.
e
bid
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Sin
–12
Because the eddy probe works on the principle of conductivity, shaft
irregularities (flat spots, scratches, plating, hardness variations, carbon inclusions, magnetized regions, etc.) may produce false vibration
signals. API Standard 670 recommends that combined total electrical and mechanical runout does not exceed 0,25 mils maximum.
Some irregularities, such as plated shafts, cannot be reduced to an
acceptable level with traditional methods (peening, knurling, etc.).
um
in
um
Al
–14
–6
SKF monitors provide current limited power to eddy probe systems
that meet safety requirements of most applications. However, if
intrinsic safety barriers (Zener barriers) will be used, consult the local
sales representative to make sure that range, linearity and power
requirements will be met.
r
–18
Runout
Intrinsic safety
Grade 304
stainless
steel
–20
pe
Standard systems are calibrated to observe 4140 steel. As recommended by the American Petroleum Institute (API) Standard 670,
probe calibration should be verified on a target with the same electrical characteristics as the shaft. The SKF CMSS 601 static calibrator
and the driver trim control permit verification and convenient field
calibration within a ±5% range on the shaft itself. Response is dependent upon the conductance of the target material, as illustrated on
the chart below. Drivers may be special ordered for calibrated
response to different metal types. Customers will be requested to
provide samples of the metal types.
Co
p
Target material
–2
0
0
(0)
0,25 0,50 0,75 1,00 1,25 1,50 1,75 2,00 2,25 2,50
(10) (20) (30) (40) (50) (60) (70) (80) (90) (100)
Gap from probe tip to test article, mm (mils)
API 670 was written to define reliable protection systems for rotating
equipment operating in the harsh conditions found in oil production,
refining and chemical processing. SKF Ryton based eddy current
probes were designed using a unique temperature chamber to test
the probes 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 strives to maintain output sensitivity over the specified temperature range.
“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. The material is
now beginning to be used in the manufacture of automobile engine
camshafts. That’s what we mean when we say “super tough”.
Table 2
Standard eddy probe systems from SKF
System
Usable range
Sensitivity
System length
Standard case Comments
CMSS 65 / CMSS 665
CMSS 68 / CMSS 668
CMSS 68 / CMSS 668-1
2 mm (80 mils)
2,3 mm (90 mils)
2,3 mm (90 mils)
7,87 mV/μm (200 mV/mil)
7,87 mV/μm (200 mV/mil)
7,87 mV/μm (200 mV/mil)
5 m (16.4 ft.)
5 m (16.4 ft.)
10 m (32.8 ft.)
1/4-28
3/8-24
3/8-24
7,87 mV/μm (200 mV/mil)
1,97 mV/μm (50 mV/mil)
3,94 mV/μm (100 mV/mil)
3/8-24
15 m (49.2 ft.)
10,8 m (35.4 ft.) 1-12
3/8-24
10 m (32.8 ft.)
CMSS 68 / CMSS 668-2 2,3 mm (90 mils)
CMSS 62 / CMSS 620-2 1,5 to 7,6 mm (60 to 300 mils)
CMSS 68 / CMSS 668H-5 0,4 to 4,1 mm (15 to 160 mils)
Standard system
Meets intent of API 670
Long system length
Long system length
Long range
Long range
7
SKF's eddy current probes are available in a variety of case mounting
configurations and length options to meet difficult installation
requirements.
Ryton is impervious to any solvent at temperatures up to
205 °C (400 °F). For this reason, SKF driver housings are also made
of this same super tough material. An added benefit is that 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
protects these components from moisture ingression and corrosion.
This increases system reliability by eliminating the need to totally
encapsulate these components. Due to its 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's 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 ATEX (Sira)/CSA/FM certified.
The small tip diameter (5 mm (0.2 in.)) 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 CMSS 65 an exceptional choice for measuring vibration in small diameter shafts. The CMSS 65 is available in
5 m (16.4 ft.) systems (probe with integral cable or a combination of
probe cable and extension cable) and has a typical usable range of
0,2 to 2,3 mm (10 to 90 mils) with a 7,87 V/mm (200 mV/mil) sensitivity. A specific CMSS 665 driver is required for each of the standard
lengths, which are shown in table 2.
The larger tip diameter (8 mm (0.3 in.)) of the CMSS 68 SKF
transducer 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 m (16.4, 32.8 or 49.2 ft.) systems and has a typical usable
range of 0,2 to 2.5 mm (10 to 100 mils) with a 7,87 V/mm
(200 mV/mil) sensitivity. The CMSS 668H-5 driver provides a usable
range of 0,4 to 4,0 mm (15 to 160 mils) with a sensitivity of
3,94 V/mm (100 mV/mil); it is available only as a 10 m (32.8 ft.)
system.
8
Table 3
Temperature conversion table
Fahrenheit to Celcius: °C = 0,556 × (°F – 32)
Celsius to Fahrenheit: °F = (1,8 × °C) + 32
Common °C and °F equivalents
°C
°F
°C
°F
–40 = –40
–20 = –5
–10 = +15
+40
+50
+60
= +105
= +120
= +140
–5
0
+5
+70
+80
+90
= +160
= +175
= +195
= +25
= +30
= +40
+10 = +50
+20 = +70
+30 = +85
+100 = +210
+150 = +300
+200 = +390
Table 4
Length conversion table
mil to μm: μm = mil × (25,4 × 10–6)
μm to mil: mil = μm / (25,4 × 10–6)
Common mil and μm equivalents
mil
μm or mm
mil
μm or mm
1
= 25,4 μm
5
= 127,0 μm
10 = 254,0 μm
80 = 2,0320 mm
90 = 2,2860 mm
100 = 2,5400 mm
20 = 508,0 μm
30 = 762,0 μm
40 = 1,0160 mm
110 = 2,7940 mm
120 = 3,0480 mm
130 = 3,3020 mm
50 = 1,2700 mm
60 = 1,5240 mm
70 = 1,7780 mm
140 = 3,5560 mm
150 = 3,8100 mm
200 = 5,0800 mm
1 m = 39 in. = 1.7 ft.
1 in. = 0,0254 m = 25,4 mm
Common meter, inch and foot equivalents
m
in.
ft.
0,5
1,0
5,0
= 19.7 = 1.7
= 39.4 = 3.3
= 196.9 = 16.4
10,0
15,0
20,0
25,0
=
=
=
=
393.7
590.6
787.4
984.3
=
=
=
=
32.8
49.2
65.6
82.0
Eddy probe systems
CMSS 65 / CMSS 665 series
5 mm eddy probe system, Ryton–based eddy current transducers
Option now available with either the standard
removable/reversible connector or the optional
permanent fixed connector.
Introduction
The eddy probe is used to measure radial or axial
shaft motion. It is mounted through or to the side
of a bearing cap and observes the shaft’s movement relative to its mounting position. An eddy
probe system comprises a probe, a driver (oscillator demodulator) and an optional extension cable.
Eddy probe systems have excellent frequency
response. They have no lower frequency limit and
are used to measure shaft axial position as well as
vibration.
Specifications
CMSS 65 eddy current probe system
Unless otherwise noted, the following specifications apply to a
complete CMSS 65 eddy current probe system, at 23 °C (73 °F), with
a –24 V DC supply and target of AISI 4140 steel, comprising of:
• CMSS 65: Eddy current probe
• CMSS 958: Extension cable
• CMSS 665 or CMSS 665P: Driver
Note: These specifications may vary with different options and systems.
Electrical
• Usable range: 2 mm (0,2 to 2,3 mm); 80 mils (10 to 90 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (1 mil) of best straight line over 2 mm (80 mil)
range
• Frequency range: DC to 10 kHz (600 000 CPM), down maximum
of 3 dB at 10 kHz
• Driver signal output:
– Impedance: Minimum calibrated load resistance of 3 kΩ; output
is protected against miswiring
– Voltage: Nominal 7,87 mV/μm (200 mV/mil) corresponding to
–18 V DC at 2,3 mm (90 mils) with –24 V DC supply
• Power supply requirements: 15 mA from –24 to –30 V DC
• Interchangeability:
– Probes, extension cables and drivers are compliant to API 670
requirement and may be interchanged with 5% or less
performance change without recalibration
– All units are factory calibrated at 23 °C (73 °F)
– Trim calibration adjustment on driver provides duplication of
characteristics after replacement of any component
Environmental and mechanical
CMSS 65 probe
• Operating temperature range: –35 to +175 °C (–30 to +350 °F)
(Note: Ex i regulations restrict upper limit to 100 °C (210 °F))
• Differential pressure: To 4 bar (60 PSI)
• Materials:
– Case: Grade 300 stainless steel
– Tip material: Ryton
– Connectors: Nickel plated stainless steel; weatherproof, sealable
– Cable: Coaxial with fluorine based polymer insulation; high
tensile and flexible strength
• Mounting: Recommend minimum clearance of 1/2 probe tip
diameter around the probe tip to maintain factory calibration
CMSS 958 extension cable
The temperature ranges, connectors and cable are the same as the
CMSS 65 eddy current probe.
9
CMSS 665 and CMSS 665P drivers
• Operating temperature range: 0 to 65 °C (30 to 150 °F)
• Connections (Power, Signal, GND):
– Five terminal removable and reversible compression terminal
block accepting up to 2 mm2 (14 AWG) wire
– Three connections necessary per block (–24 V DC, GND, Signal)
– The CMSS 665P has a permanent fixed connector with the
same connection characteristics
• Mounting: C-DIN rail mount that bolts onto the driver enclosure,
or the standard four 4,8 mm (0.19 in. or #10) clearance holes in a
square on 63,5 mm (2.5 in.) centers
Hazardous area approvals
North America
• Approvals granted by Factory Mutual (FM) and Canadian
Standards Association (CSA)
• Class I, Division 1 Groups A, B, C, D when used with intrinsically
safe Zener barriers or galvanic isolators; contact your local SKF
sales representative for details
• Class I, Division 2 Groups A, B, C, D when connected with
National Electric Code (NEC) without Zener barriers or galvanic
isolator; contact your local SKF sales representative for details
System performance
Europe
The following performance characteristics apply for the CMSS 65
eddy current probe system in addition to quoted nominal specifications:
• Certification to ATEX directive
– Drivers: Ex II 1 G EEx ia IIC T4 (–20 ≤ Ta ≤ +75 °C)
(–5 ≤ Ta ≤ +165 °F); certificate number BAS02ATEX1168X
– Probes: Ex II 1 G EEx ia IIC T4 or T2; certificate number
BAS02ATEX1169
– System: EEx ia IIC T4 or T2 (as per schedule); certificate number
Ex 02E2170
• Intrinsic safety requires use of Zener barriers; contact your local
SKF sales representative for details
• Extended temperatures: With 1 m (3.3 ft.) probe and 4 m (13.1 ft.)
extension cable operating in a range of –35 to +120 °C
(–30 to +250 °F) and driver in the range of 0 to +65 °C
(30 to 150 °F)
• Sensitivity: ±10% of 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (±1 mil) of best straight line over
2 mm (80 mil) range
• Minimum target size:
– Flat surface: 10 mm (0.39 in.)
– Shaft diameter: 15 mm (0.59 in.)
10
Note: See ordering details for probe and driver designations for hazardous
area approved models.
Standard mount case
CMSS 665 dimensions
ø 7,1 mm (0.28 in.) maximum
Armor (optional)
6,4 mm (0.25 in.)
clearance hole for
mounting with
4,8 mm (0.19 in. or
#10) hardware
6,4 cm
(2.50 in.)
5,0 mm
(0.20 in.)
Reverse mount case
3/8-24 thread
-24V
MADE IN U.S.A.
by
SKF Condition Monitoring
GND
5,2 mm
(0.21 in.)
SIG
B
6,3 mm
(0.25 in.)
A = Unthreaded case length
B = Case length
6,4 cm
(2.50 in.)
5 mm
DISPLACEMENT
PROBE DRIVER
S/N
GND
A
CMSS665
-24V
1/4-28 or M8 × 1 thread
7,6 cm
(3.00 in.)
Connector: Stainless steel
jack-type mates with CMSS 958
extension cable
7/16 in. hex
5,0 mm
(0.20 in.)
1 2 3 4 5
5,5 mm (0.22 in.)
8,8 mm (0.35 in.)
7,6 cm
(3.00 in.)
30,5 mm
(1.20 in.)
Removable or permanent fixed
connector: Terminal strip type
rated for 250 V, 10 A, 14 AWG
maximum wire size
Button (disk) probe
4,1 cm
(1.60 in.)
9,5 mm (0.37 in.)
Probe
Cable
2,5 mm
(0.10 in.)
4,8 mm (0.19 in.)
6,9 mm (0.27 in.)
0,8 mm (0.03 in.)
ø 2,6 mm (0.10 in.)
11
Ordering information – Part 1: Eddy current
probe
Ordering information – Part 2: Extension
cable
Ordering information
Ordering information
CMSS 65 Eddy current probe.
(SKF standard: CMSS 65-002-00-12-10)
CMSS 958 Extension cable.
(SKF standard CMSS 958-00-040)
Part number
aa
00
01
02
07
CMSS 65–aab-cc-dd-ee
09
0B
Cable
Standard
Armored
Fiberglass sleeved
CSA/FM/SIRA (ATEX) (Intrinsically Safe)
certified
CSA/FM/SIRA (ATEX) (Intrinsically Safe)
certified and armored
FM (non-incendive)
FM (non-incendive) armored
b
2
3
0
1
4
E
Case
1/4-28 threads (standard)
M8 × 1 threads
3/8-24 threads
M10 × 1 threads
No case
Button probe (Fiberglass)
cc
00
01 to 50
51 to 99
RM
Unthreaded case length
Fully threaded
2,5 to 127,0 mm (0.1 to 5.0 in.) (unthreaded)
129,5 to 251,5 mm (5.1 to 9.9 in.)
Reverse mount, 3/8-24 threads
dd
00
08
12
15
20
25
30
40
47
60
90
09 to 59
91 to 99
Case length
Standard: No case
Standard: 2,0 cm (0.8 in.)
Standard: 3,0 cm (1.2 in.)
Standard: 3,8 cm (1.5 in.)
Standard: 5,1 cm (2.0 in.)
Standard: 6,4 cm (2.5 in.)
Standard: 7,6 cm (3.0 in.)
Standard: 10,2 cm (4.0 in.)
Standard: 11,9 cm (4.7 in.)
Standard: 15,2 cm (6.0 in.)
Standard: 22,9 cm (9.0 in.)
Special: 2,3 to 15,0 cm (0.9 to 5.9 in.)
Special: 23,1 to 25,1 cm (9.1 to 9.9 in.)
ee
05
10
5A
Overall length*
0,5 m (1.6 ft.)
1,0 m (3.3 ft.) (standard)
5,0 m (16.4 ft.)
08
* Length is nominal electrical; physical length may vary.
Compatible systems:
• 0,5 m probe / 5,0 m system: CMSS 958-xx-045 / CMSS 665
• 1,0 m probe / 5,0 m system: CMSS 958-xx-040 / CMSS 665
• 5,0 m probe / 5,0 m system: CMSS 665
The 5A units have an integral cable and mate directly to the driver.
Reverse mount case and button (disk) probe:
• Reverse mount case: CMSS 65-aa0-RM-12-ee
• Button (disk) probe: CMSS 65-aaE-00-00-ee
12
Part number
aa
00
01
02
09
0A
CMSS 958–aa-bbb
0H
0J
Cable
Standard
Armored
Fiberglass sleeved
CSA/FM/SIRA (ATEX) (Intrinsically Safe) certified
CSA/FM/SIRA (ATEX) (Intrinsically Safe) certified
and armored
FM (non-incendive)
FM (non-incendive) armored
bbb
030
040
045
090
095
Length (compatible system listed)
3,0 m (9.8 ft.) (CMSS 665, 2,0 m (6.56 ft.) CMSS 65)
4,0 m (13.1 ft.) (CMSS 665, 1,0 m (3.28 ft.) CMSS 65)
4,5 m (14.8 ft.) (CMSS 665, 0,5 m (1.64 ft.) CMSS 65)
9,0 m (29.5 ft.) (CMSS 665-1, 1,5 m (3.28 ft.) CMSS 65)
9,5 m (31.2 ft.) (CMSS 665-1, 0,5 m (1.64 ft.) CMSS 65)
Ordering information – Part 3: Driver
(SKF standard: CMSS 665)
Drivers containing “P” in the model number denote those models
with a permanent fixed connector.
Driver (5 m system) – CMSS 665 / CMSS 665P
CMSS 665-16-xx / CMSS 665P-16-xx*
These are CSA/FM/SIRA (Intrinsically Safe) certified drivers for a 5 m
system calibrated for shaft materials other than standard 4140
stainless steel. Use this driver with CSA/FM/SIRA (Intrinsically Safe)
certified 1 m CMSS 65 probe and 4 m CMSS 958 extension cable.
For intrinsic safety installations, drivers must be installed with intrinsic safety (I-S) barriers (see CMSS 665-16-9).
7,87 mV/μm (200 mV/mil). Use with:
• 1,0 m probe and 4,0 m extension cable
• 0,5 m probe and 4,5 m extension cable
• 5,0 m probe
Driver (10 m system) – CMSS 665-1 / CMSS 665P-1
Use with a 1 m probe and 9 m extension cable or a 10 m probe.
• Usable range: 2 mm (0,25 to 2,30 mm); 80 mils (10 to 90 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil), ±10%
• Linearity: ±38 μm (1.5 mil) from best straight line
Enhanced environmental protection – CMSS 665-8 /
CMSS 665P-8
Specifications for an enhanced environmental protection driver are
the same as for the standard driver; however, the enhanced environmental protection driver is also filled with potting material to provide
an additional measure of protection when operated in adverse environmental conditions.
• Sensitivity: 7,87 mV/μm (200 mV/mil)
Hazardous area approval (Intrinsic Safety) with 4140 stainless
steel target – CMSS 665-16-9 / CMSS 665P-16-9
This driver is CSA/FM/SIRA (Intrinsically Safe) certified for a 5 m system. Use it with CSA/FM/SIRA (Intrinsically Safe) certified 1 m
CMSS 65 probe and 4 m CMSS 958 extension cable. For intrinsic
safety installations, drivers must be installed with intrinsic safety
(I-S) barriers.
• Usable range:
– Best attainable for specific shaft material provided
– Customer to provide identification of shaft material and sample
(approximately 5,1 cm (2.0 in.) diameter disk, 1,3 cm (0.5 in.)
thick)
– Range not expected to exceed the 1,1 mm (45 mils) of standard
unit
• Sensitivity: 7,87 mV/μm (200 mV/mil), ± to be determined percentage of 7,87 mV/μm (200 mV/mil) dependent on the shaft
sample material (–24 V DC supply)
• Linearity: ± the minimum deviation (in μm or mils) from the best
straight line attainable for the sample shaft material provided
* xx = System calibrated for shaft materials other than standard 4140 stainless steel. For custom configurations, please contact an SKF sales representative.
Hazardous area approval (non-incendive) with 4140 stainless
steel target – CMSS 665-20-00 / CMSS 665P-20-00
This FM (non-incendive) certified driver for the 5 m system is used
with the FM (non-incendive) certified 1 m CMSS 65 probe and
CMSS 958 extension cable.
• Usable range: 2 mm (0,25 to 2,25 mm); 80 mils (10 to 90 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (1 mil) of best straight line over 2 mm (80 mil)
range
Note: All circuit boards used in SKF CMSS 665 series drivers are conformal
coated as standard procedure.
Barriers
• For FM approval:
– Power: Stahl 8901/30-280/085/00
– Signal: Stahl 8901/30-199/038/00
• For CSA and SIRA approval:
– Power/Signal: MTL 7096 Dual (neg)
Contact your local SKF sales representative for details.
• Usable range: 1,15 mm (0,25 to 1.4 mm); 45 mils (10 to 55 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (1 mil) from best straight line over
1,15 mm (45 mil) range
13
CMSS 68 / CMSS 668 series
8 mm eddy probe system, Ryton–based eddy current transducers
Option now available with either the standard
removable/reversible connector or the
optional permanent fixed connector.
Introduction
The eddy probe is used to measure radial or
axial shaft motion. It is mounted through or
to the side of a bearing cap and observes the
shaft’s movement relative to its mounting
position. An eddy probe system comprises a
probe, a driver (oscillator demodulator) and
an optional extension cable.
Eddy probe systems have excellent
frequency response. They have no lower
frequency limit and are used to measure
shaft axial position as well as vibration.
Specifications
CMSS 68 eddy current probe system
Unless otherwise noted, the following specifications apply to a
complete CMSS 68 eddy current probe system, at 23 °C (73 °F), with
a –24 V DC supply and target of AISI 4140 steel, comprising of:
• CMSS 68: Eddy current probe
• CMSS 958: Extension cable
• CMSS 668 or CMSS 668P: Driver
Note: These specifications may vary with different options and systems.
Electrical
• Usable range: 2,3 mm (0,2 to 2,5 mm); 90 mils (10 to 100 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (1 mil) of best straight line over
2,3 mm (90 mil) range
• Frequency range: DC to 10 kHz (600 000 CPM), down maximum
of 3 dB at 10 kHz
• Driver signal output:
– Impedance: Minimum calibrated load resistance of 3 kΩ; output
is protected against miswiring
– Voltage: Nominal 7,87 mV/μm (200 mV/mil) corresponding to
–18 V DC at 2,3mm (90 mils) with –24 V DC supply
• Power supply requirements: 15 mA from –24 to –30 V DC
14
• Interchangeability:
– Probes, extension cables and drivers are compliant to API 670
requirement and may be interchanged with 5% or less
performance change without recalibration
– All units factory calibrated at 23 °C (73 °F)
– Trim calibration adjustment on driver provides duplication of
characteristics after replacement of any component
Environmental and mechanical
CMSS 68 probe
• Operating temperature range: –35 to +175 °C (–30 to +350 °F)
(Note: Ex i regulations restrict upper limit to 100 °C (210 °F))
• Differential pressure: To 4 bar (60 PSI)
• Materials:
– Case: Grade 300 stainless steel
– Tip material: Ryton
– Connectors: Nickel plated stainless steel; weatherproof, sealable
– Cable: Coaxial with fluorine based polymer insulation; high
tensile and flexible strength
• Mounting: Recommend minimum clearance of 1/2 probe tip
diameter around the probe tip to maintain factory calibration
CMSS 958 extension cable
The temperature ranges, connectors and cable are the same as the
CMSS 68 eddy current probe.
CMSS 668 and CMSS 668P drivers
• Operating temperature range: 0 to 65 °C (30 to 150 °F)
• Connections (Power, Signal, GND):
– Five terminal removable and reversible compression terminal
block accepting up to 2 mm2 (14 AWG) wire
– Three connections necessary per block (–24 V DC, GND, Signal)
– The CMSS 668P has a permanent fixed connector with the
same connection characteristics
• Mounting: C-DIN rail mount that bolts onto the driver enclosure or
the standard four 4,8 mm (0.19 in. or #10) clearance holes in a
square on 63,5 mm (2.5 in.) centers
Hazardous area approvals
North America
• Approvals granted by Factory Mutual (FM) and Canadian
Standards Association (CSA)
• Class I, Division 1 Groups A, B, C, D when used with intrinsically
safe Zener barriers or galvanic isolators; contact your local SKF
sales representative for details
• Class I, Division 2 Groups A, B, C, D when connected with
National Electric Code (NEC) without Zener barriers or galvanic
isolator; contact your local SKF sales representative for details
System performance
Europe
The following performance characteristics apply for the CMSS 68
eddy current probe system in addition to quoted nominal
specifications:
• Certification to ATEX Directive
– Drivers: Ex II 1 G EEx ia IIC T4 (–20 ≤ Ta ≤ +75 °C)
(–5 ≤ Ta ≤ +165 °F); certificate number BAS02ATEX1168X
– Probes: Ex II 1 G EEx ia IIC T4 or T2; certificate number
BAS02ATEX1169
– System: EEx ia IIC T4 or T2 (as per schedule); certificate number
Ex 02E2170
• Intrinsic Safety requires use of Zener barriers; contact your local
SKF sales representative for details
• Extended temperatures: With 1 m (3.3 ft.) probe and 4 m (13.1 ft.)
extension cable operating in a range of –35 to +120 °C
(–30 to +250 °F), and driver in the range of 0 to 65 °C
(30 to 150 °F)
• Sensitivity: ±10% of 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (1 mil) of best straight line over
2,3 mm (90 mil) range
• Minimum target size:
– Flat surface: 16 mm (0.63 in.)
– Shaft diameter: 24 mm (0.93 in.)
Note: See ordering details for probe and driver designations for hazardous
area approved models.
15
Standard mount case
CMSS 668 dimensions
ø 7,1 mm (0.28 in.) maximum
6,4 mm (0.25 in.)
clearance hole for
mounting with
4,8 mm (0.19 in. or
#10) hardware
Armor (optional)
6,4 cm
(2.50 in.)
8,0 mm
(0.31 in.)
A = Unthreaded case length
B = Case length
-24V
GND
MADE IN U.S.A.
by
SKF Condition Monitoring
SIG
8,2 mm
(0.32 in.)
Reverse mount case
3/8-24 thread
6,4 cm
(2.50 in.)
8 mm
DISPLACEMENT
PROBE DRIVER
S/N
GND
A
B
7,0 mm
(0.28 in.)
CMSS668
-24V
3/8-28 or M10 × 1 thread
7,6 cm
(3.00 in.)
Connector: Stainless steel
jack-type mates with CMSS 958
extension cable
7/16 in. hex
8,0 mm
(0.31 in.)
1 2 3 4 5
6,9 mm (0.27 in.)
8,8 mm (0.35 in.)
7,6 cm
(3.00 in.)
30,5 mm
(1.20 in.)
Removable or permanent fixed
connector: Terminal strip type
rated for 250 V, 10 A, 14 AWG
maximum wire size
Button (disk) probe
4,1 cm
(1.60 in.)
12,7 mm (0.50 in.)
Probe
Cable
5,1 mm
(0.20 in.)
7,6 mm (0.30 in.)
13,1 mm (0.52 in.)
2,3 mm (0.09 in.)
ø 2,8 mm (0.11 in.)
16
Ordering information – Part 1: Eddy current
probe
Ordering information – Part 2: Extension
cable
Ordering information
Ordering information
CMSS 68 eddy current probe.
(SKF standard: CMSS 68-000-00-12-10)
CMSS 958 Extension cable.
(SKF standard CMSS 958-00-040)
Part number
aa
00
01
02
07
08
09
0B
14
15
16
CMSS 68–aab-cc-dd-ee
Cable
Standard
Armored
Fiberglass sleeved
CSA/FM/SIRA (ATEX) (IS) certified
CSA/FM/SIRA (ATEX) (IS) certified and armored
FM (non-incendive)
FM (non-incendive) armored
Standard for CMSS 668H-5 use
Armored for CMSS 668H-5 use
Fiberglass sleeved for CMSS 668H-5 use
b
0
1
4
E
M10 × 1 threads
No case
Button probe (Fiberglass)
cc
00
01 to 50
51 to 99
RM
Unthreaded case length
Fully threaded
2,5 to 127,0 mm (0.1 to 5.0 in.) (unthreaded)
129,5 to 251,5 mm (5.1 to 9.9 in.)
Reverse mount, 3/8-24 threads
dd
00
08
12
15
20
25
30
40
47
60
90
09 to 59
91 to 99
Case length
Standard: No case
Standard: 2,0 cm (0.8 in.)
Standard: 3,0 cm (1.2 in.)
Standard: 3,8 cm (1.5 in.)
Standard: 5,1 cm (2.0 in.)
Standard: 6,4 cm (2.5 in.)
Standard: 7,6 cm (3.0 in.)
Standard: 10,2 cm (4.0 in.)
Standard: 11,9 cm (4.7 in.)
Standard: 15,2 cm (6.0 in.)
Standard: 22,9 cm (9.0 in.)
Special: 2,3 to 15,0 cm (0.9 to 5.9 in.)
Special: 23,1 to 25,1 cm (9.1 to 9.9 in.)
ee
05
10
5A
AA
FA
Overall length*
0,5 m (1.6 ft.)
1,0 m (3.3 ft.) (standard)
5,0 m (16.4 ft.)
10,0 m (32.8 ft.)
15,0 m (49.2 ft.)
Case
3/8-24 threads (standard)
Part number
aa
00
01
02
09
0A
CMSS 958–aa-bbb
0H
0J
50
51
52
Cable
Standard
Armored
Fiberglass sleeved
CSA/FM/SIRA (ATEX) (Intrinsically Safe) certified
CSA/FM/SIRA (ATEX) (Intrinsically Safe) certified
and armored
FM (non-incendive)
FM (non-incendive) armored
Standard for CMSS 668H-5 use
Armored for CMSS 668H-5 use
Fiberglass sleeved for CMSS 668H-5 use
bbb
040
045
090
095
140
Length (compatible system listed)
4,0 m (13.1 ft.) (CMSS 668, 1,0 m (3.28 ft.) CMSS 68)
4,5 m (14.8 ft.) (CMSS 668, 0,5 m (1.64 ft.) CMSS 68)
9,0 m (29.5 ft.) (CMSS 668-1, 1,0 m (3.28 ft.) CMSS 68)
9,5 m (31.2 ft.) (CMSS 668-1, 0,5 m (1.64 ft.) CMSS 68)
14,0 m (45.9 ft.) (CMSS 668-2, 1,0 m (3.28 ft.) CMSS 68)
* Length is nominal electrical; physical length may vary.
Compatible systems:
•
•
•
•
•
0,5 m probe / 5,0 m system: CMSS 958-xx-045 / CMSS 668
1,0 m probe / 5,0 m system: CMSS 958-xx-040 / CMSS 668
5,0 m probe / 5,0 m system: CMSS 668
10,0 m probe / 10,0 m system: CMSS 668
15,0 m probe / 15,0 m system: CMSS 668
The 5A, AA and FA units have an integral cable and mate directly to the
driver.
Reverse mount case and button (disk) probe:
• Reverse mount case: CMSS 68-aa0-RM-12-ee
• Button (disk) probe: CMSS 68-aaE-00-00-ee
17
Ordering information – Part 3: Driver
(SKF standard: CMSS 668)
Drivers containing “P” in the model number denote those models
with a permanent fixed connector.
Driver (5 m system) – CMSS 668 / CMSS 668P
Barriers
• For FM approval:
– Power: Stahl 8901/30-280/085/00
– Signal: Stahl 8901/30-199/038/00
• For CSA and SIRA approval:
– Power/Signal: MTL 7096 Dual (neg)
7,87 mV/μm (200 mV/mil). Use with:
Contact your local SKF sales representative for details.
• 1,0 m probe and 4,0 m extension cable
• 0,5 m probe and 4,5 m extension cable
• 5,0 m probe
• Usable range: 1,6 mm (0,25 to 1,9 mm); 65 mils (10 to 75 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (1 mil) from best straight line over
1,15 mm (45 mil) range
Driver (10 m system) – CMSS 668-1 / CMSS 668P-1
Use with a 1 m probe and 9 m extension cable or a 10 m probe.
• Usable range: 2,3 mm (0,25 to 2,5 mm); 90 mils (10 to 100 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil) ±10%
• Linearity: ±38 μm (1.5 mil) from best straight line
Driver (15 m system) – CMSS 668-2 / CMSS 668P-2
CMSS 668-16-xx / CMSS 668P-16-xx*
These are CSA/FM/SIRA (Intrinsically Safe) certified drivers for a 5 m
system calibrated for shaft materials other than standard 4140
stainless steel. Use this driver with CSA/FM/SIRA (Intrinsically Safe)
certified 1 m CMSS 68 probe and 4 m CMSS 958 extension cable.
For intrinsic safety installations, drivers must be installed with
intrinsic safety (I-S) barriers (see CMSS 668-16-9).
Use with a 1 m probe and 14 m extension cable or a 15 m probe.
• Usable range: 2,3 mm (0,25 to 2,5 mm); 90 mils (10 to 100 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil) ±10% at 23 °C (73 °F)
• Linearity: ±38 μm (1.5 mil) from best straight line over 2,3 mm at
23 °C (73 °F)
Driver (extended range) – CMSS 668H-5 / CMSS 668HP-5
Use with a 1 m probe and 9 m extension cable or a 10 m probe.
• Usable range: 3,6 mm (0,4 to 4,0 mm); 145 mils (15 to 160 mils)
• Sensitivity: 3,94 mV/μm (100 mV/mil) ±10% at +23 °C (73 °F)
• Linearity: ±25,4 μm (1 mil) from best straight line over 3,6 mm at
23 °C (73 °F)
Enhanced environmental protection – CMSS 668-8 /
CMSS 668P-8
• Usable range:
– Best attainable for specific shaft material provided
– Customer to provide identification of shaft material and sample
(approximately 5,1 cm (2.0 in.) diameter disk, 1,3 cm (0.5 in.)
thick)
– Range not expected to exceed the 1,651 mm (65 mils) of
standard unit
• Sensitivity: 7,87 mV/μm (200 mV/mil), ± to be determined percentage of 7,87 mV/μm (200 mV/mil) dependent on the shaft
sample material (–24 V DC supply)
• Linearity: ± the minimum deviation (in μm or mils) from the best
straight line attainable for the sample shaft material provided
* xx = System calibrated for shaft materials other than standard 4140
stainless steel. For custom configurations, please contact an SKF sales
representative.
Specifications for an enhanced environmental protection driver are
the same as for the standard driver; however, the enhanced
environmental protection driver is also filled with potting material to
provide an additional measure of protection when operated in
adverse environmental conditions
Hazardous area approval (non-incendive) with 4140 stainless
steel target – CMSS 668-20-00 / CMSS 668P-20-00
• Sensitivity: 7,87 mV/μm (200 mV/mil)
• Usable range: 2,3 mm (0,25 to 2,5 mm); 90 mils (10 to 100 mils)
• Sensitivity: 7,87 mV/μm (200 mV/mil)
• Linearity: ±25,4 μm (1 mil) of best straight line over
2,3 mm (90 mil) range
Hazardous area approval (Intrinsic Safety) with 4140 stainless
steel target – CMSS 668-16-9 / CMSS 668P-16-9
This driver is CSA/FM/SIRA (Intrinsically Safe) certified for a 5 m system. Use it with CSA/FM/SIRA (Intrinsically Safe) certified 1 m
CMSS 68 probe and 4 m CMSS 958 extension cable. For intrinsic
safety installations, drivers must be installed with intrinsic safety
(I-S) barriers.
18
This FM (non-incendive) certified driver for the 5 m system is used
with the FM (non-incendive) certified 1 m CMSS 68 probe and
CMSS 958 extension cable.
Note: All circuit boards used in SKF CMSS 668 series drivers are conformal
coated as standard procedure.
CMSS 62 / CMSS 620 series
19 mm eddy probe system
For long range (wide gap) measurements.
• 1,5 to 7,6 mm (60 to 300 mils) usable range
at 1,96 V/mm (50 mV/mil) sensitivity
• 10,8 m (35.4 ft.) overall cable lengths
• Dependable eddy current operation
• Readily interchangeable on-site
• Durable, high-temperature probe tip
• Rugged, long life connectors
Introduction
The CMSS 62 eddy probe, when used with a CMSS
SS 620-2 driver, has
a usable range that is typically 1,5 to 7,6 mm (60 to 300 mils). The
standard output sensitivity of the system is 1,96 V/mm (50 mV/mil).
The CMSS 62 packs a long range into a rugged industrial probe. It
is used extensively in those applications involving large position
measurement. Differential expansion measurement is an ideal
application for the CMSS 62.
The CMSS 62 is available in several probe case configurations and
environmental options to meet a wide range of installation requirements.
Typical CMSS 62 / CMSS 620-2 performance: sensitivity vs. gap
Sensitivity, V/mm (mV/mil)
2,50 (60)
Specifications
2,25 (55)
The following specifications apply to a system including the CMSS 62
eddy probe, CMSS 620-2 driver and CMSS 900 extension cable.
2,00 (50)
Electrical
• Usable range: 1,5 to 7,6 mm (60 to 300 mils)
• Sensitivity: 1,96 V/mm (50 mV/mil), ±10% (–24 V DC supply) at
23 °C (73 °F)
• Linearity: ±2 mil of best straight line from 2 to 7 mm (80 to
280 mils) gap, ±10% of 1,96 V/mm (50 mV/mil) sensitivity from 2
to 7 mm (80 to 280 mils) absolute gap at 23 °C (73 °F)
• Frequency range: Static to 600 000 CPM; down to 3 dB at
600 000 CPM
• Driver signal output:
– Impedance: 30 Ω
– Current: 4 mA maximum
– Voltage:
· Nominal: 1,96 V/mm (50 mV/mil)
· Maximum output: –19 V with –24 V supply
• Power: –24 V DC
1,75 (45)
1,50 (40)
1,5
(60)
2,5
(100)
3,5
(140)
4,5
(180)
5,5
(220)
6,5
(260)
7,5
(300)
Gap (mils)
Typical CMSS 62 / CMSS 620-2 performance: output vs. gap
Output, Volts
–20
–18
–16
–14
–12
–10
–8
–6
–4
–2
0
Note: Performance specifications are based on a 4140 steel target. Consult
an SKF sales representative for calibration requirements on other materials.
2,0
(80)
3,0
(120)
4,0
(160)
5,0
(200)
6,0
(240)
7,0
(280)
Gap, μm (mils)
19
CMSS 620-2 driver
• Operating temperature range: –35 to +65 °C (–30 to +150 °F)
• Calibration probe temperature: 23 °C (73°F)
• Connections (power, output, common): Three terminal barrier
strip (accepts 3,5 mm (0.14 in. or #6) spade lugs)
• Mounting holes: Four 4,8 mm (0.19 in. or #10) clearance holes in
a square on 63 mm (2.5 in.) centers
• Interchangeability:
– Probes and drivers may be interchanged with 10% or less
performance change without calibration
– All units factory calibrated
– Trim calibration adjustment on driver allows duplication of
replacement
Standard mount case
ø 7,1 mm (0.28 in.) maximum
1-12 thread
Armor (optional)
19,0 mm (0.75 in.)
22,8 mm (0.90 in.)
A
B
A = Unthreaded case length
B = Case length
15,2 mm (0.60 in.)
Environmental and mechanical
CMSS 62 probe
•
•
•
•
Operating temperature range: –35 to +175 °C (–30 to +350 °F)
Case material: Grade 300 stainless steel
Connections: Stainless steel; weather-proof, sealable
Cable: Coaxial with fluorine based polymer insulation; high tensile
and flexural strength
• Mounting: Any position
CMSS 900 extension cable
• Operating temperature range: –35 to +120 °C (–30 to +250 °F)
• Connections: Stainless steel; weather-proof, sealable
• Cable: Coaxial with fluorine based polymer insulation; high tensile
and flexural strength
20
Button (disk) probe
19,0 mm
(0.75 in.)
38,1 mm
(1.50 in.)
120°
33,3 mm
(1.31 in.)
Cable
Mounting
surface
19,1 mm
(0.75 in.)
4,2 mm (0.16 in. or #8)
mounting holes
(three places)
Ordering information – Part 1: Eddy current
probe
Ordering information – Part 2: Extension
cable
Ordering information
Ordering information
CMSS 62 eddy current probe.
(SKF standard: CMSS 62-000-00-30-20)
CMSS 900 Extension cable.
(SKF standard CMSS 900-00-088)
Part number
CMSS 62–abc-dd-ee-ff
a
0
Calibration temperature
25 °C (75 °F); operation < 95°C (200 °F)
(use CMSS 620-2 driver)
b
0
1
4
5
8
9
Cable
Standard
Radiation-resistant
Armored
Armored and radiation-resistant
Fiberglass sleeved
Radiation-resistant, fiberglass sleeved
c
0
4
5
6
Case
1-12 2A threads (standard)
No case
Button (disk) probe
RIght angle cable exit 1-12 2A threads
dd
00
01 to 50
Unthreaded case length
Fully threaded
2,5 to 127,0 mm (0.1 to 5.0 in.) (unthreaded)
ee
00
10
15
30
35
50
Case length
Standard: No case
Standard: 2,5 cm (1.0 in.)
Standard: 3,8 cm (1.5 in.)
Standard: 7,6 cm (3.0 in.)
Standard: 8,9 cm (3.5 in.)
Standard: 12,7 cm (5.0 in.)
ff
10
20
40
Overall length
1,0 m (3.3 ft.)
2,0 m (6.6 ft.) (standard)
4,0 m (13.1 ft.)
Part number
CMSS 900–ab-ccc
a
0
1
2
3
4
5
Cable
Standard
Armored
Radiation-resistant
Armored and radiation-resistant
Fiberglass sleeved
Fiberglass sleeved and radiation-resistant
b
0
1
2
Connectors
Both straight
One right angle
Both right angle
ccc
068
Length*
6,8 m (22.3 ft.): use with 4,0 m (13.1 ft.) probe and
CMSS 620-2 driver
8,8 m (28.9 ft.): use with 2,0 m (6.6 ft.) probe and
CMSS 620-2 driver
9,8 m (32.2 ft.): use with 1,0 m (3.3 ft.) probe and
CMSS 620-2 driver
088
098
Note: Radiation-resistant probes must use radiation-resistant extension
cables and driver.
* Probe overall lengths and extension cable lengths are nominal and will vary to
meet electrical interchangeability requirements. Contact your local SKF sales
representative for unlisted options.
Button (disk) probe:
• CMSS 62-ab5-00-00-ff
Ordering information – Part 3: Driver
(SKF standard: CMSS 620-2;
radiation-resistant CMSS 620-6)
Use with:
• 1,0 m (3.3 ft.) probe and 9,8 m (32.2 ft.) extension cable
• 2,0 m (6.6 ft.) probe and 8,8 m (28.9 ft.) extension cable
• 4,0 m (13.1 ft.) probe and 6,8 m (22.3 ft.) extension cable
21
Eddy current probe installation
accessories
CMSS 904
Probe holder
The CMSS 904 probe holder provides a rigid mount with provision
for external gap adjustment. Conduit may be readily mounted at the
cable exit. The CMSS 904 provides 19,1 mm (0.75 in.) of adjustment
range after installation; a set screw securely locks the adjustment. It
is recommended that probes be ordered with a case length of
30,5 mm (1.2 in.) or use the standard reverse mount probe.
Dimensions
Dimension “A”
12,7 mm (0.5 in.) NPT external
(machine case mounting point)
12,7 mm (0.5 in.) NPT internal
(conduit mount)
Adjustment range
By trimming the stinger, the working range of the long CMSS 904 is 10,2
to 19,7 cm (4.00 to 7.75 in.) from mounting surface to probe tip (combination of stinger length and adjustment inside threaded stock); the range
of the short CMSS 904 is 6,4 to 12,1 cm (2.50 to 4.75 in.).
Ordering information
CMSS 904 Probe holder.
Part number
CMSS 904–ab-ccc
a
0
3/8-24 CMSS 65 / CMSS 68 reverse mount standard*
b
0
Other options
None required
ccc
025
055
Dimension “A” “stinger” depth
Short: 19,1 to 63,5 mm (0.75 to 2.5 in.)**
Long: 36,8 to 139,7 mm (1.45 to 5.50 in.)**
Probe thread
* CMSS 65 / CMSS 68 3/8-24 reverse mount eddy probe is recommended
configuration offered in either 5 or 8 mm versions.
** “Stingers” may be cut down in the field within the indicated ranges.
22
CMSS 912
Dimensions
Dual axial probe adapter
The CMSS 912 dual axial probe adapter
provides mounting and protection for two
parallel probes for measuring axial thrust
position. The probes are mounted on adapters that are installed directly on the machine
case through 1/2 in. NPT-threaded holes.
The adapters provide for easy gapping of the
probes. The enclosure bolts directly to the
machine case and protects the probe installation. A removable cover provides access to
the installed probe.
It is recommended that probes be ordered
with a case length of 30,5 mm (1.2 in.) and
an overall length of 0,5 or 1,0 m (1.6 or
3.3 ft.).
116 mm
(4.62 in.)
Conduit hub
3/4 in.
166 mm
(6.62 in.)
Fitting not
furnished
Working
range
1/2 in. NPT
Machine
surface
(two places)
Probes (two)
not included
Shaft
38 mm
(1.50 in.)
Ordering information
CMSS 912-1 Dual axial probe adapter. Working range* 27,9 to
56,7 mm (1.10 to 2.35 in.); probe thread 1/4-28 CMSS 65 standard.
CMSS 912-3 Dual axial probe adapter. Working range* 19,1 to
50,8 mm (0.75 to 2.00 in.); probe thread 3/8-24 CMSS 68 standard.
CMSS 912-4 Dual axial probe adapter. Working range* 24,1 to
127,0 mm (0.95 to 5.00 in.); probe thread 3/8-24 CMSS 68 standard.
* Working range with field trim of probe holder.
23
CMSS 911
Dimensions
121 mm
(4.75 in.)
Probe holder / dual sensor holder with
housing
2)
CMSS 911 probe holder
The CMSS 911 probe holder with housing offers an adjustable probe
mount with a variety of penetration depths. The integral housing
protects the probe cable exit and permits easy access for probe
adjustment without machine disassembly. It is recommended that
reverse mount probes be used or that standard case probes be
ordered with a case length of 30,5 mm (1.2 in.) and an overall cable
length of 0,5 or 1,0 m (1.6 or 3.3 ft.). The housing has four 3/4 in.
NPT hubs for conduit attachment (three close-up plugs provided).
1
2
3
4
5
6
7
Outlet body (part number 10699400) GRR-2
Outlet body extension (part number 10699300) GRCEX-0
Outlet body hub, 3/4 in. NPT (four each)
Probe adapter union; 3/4 in. NPT (part number 30180900)
Probe adapter collar (part number 30187900)
Hex head steel cap screw (part number 10702200)
Probe holder (“stinger”) (part number – various, depending on
probe holder length)
8 Jam nut:
– CMSS 68, CMSS 60: 3/8–24 (part number 30126800)
– CMSS 65, CMSS 61: 1/4–28 (part number 30053500)
9 O-ring union seal (part number 10711803)
10 O-ring tip seal (part number 10711800)
24
89 mm
(3.50 in.)
1)
76 mm
(3.00 in.)
150 mm
(5.87 in.)
1)
5,6)
3)
Outside surface
of machine
Dimension “B”
4)
9)
7)
Dimension “A”
8)
10)
Probe tip
(reference only)
Machine shaft
CMSS 911 dual sensor holder
The CMSS 911 dual sensor holder with or without the housing provides for the mounting, adjustment and protection of the eddy probe
and also provides for mounting an accelerometer or velocity sensor
on the same axis as the eddy probe for absolute vibration measurements. It is recommended that reverse mount probes be used or that
standard case probes be ordered with a case length of 30,5 mm
(1.2 in.) and an overall cable length of 0,5 or 1,0 m (1.6 or 3.3 ft.).
The housing has four 3/4 in. NPT hubs for conduit attachment (three
close-up plugs provided).
1
2
3
4
5
6
7
Outlet dome (part number 10699402) 4GOU
Seismic sensor mounting adapter (part number 301194200)
Outlet body (part number 10699401) GECXAT-2
End plug (part number 10746003) CUP-2
Probe adapter union (part number 30180900)
O-ring union seal (part number 10711803)
Jam Nut:
– CMSS 68, CMSS 60: 3/8–24 (part number 30126800)
– CMSS 65, CMSS 61: 1/4–28 (part number 30053500)
8 Seismic sensor accelerometer/velocity
9 Probe adapter collar (part number 30187900)
10 Hex head steel cap screw (part number 10702200)
11 Probe holder (“stinger”) (part number – various, depending on
length)
12 O-ring tip seal (part number 10711800)
Intermediate support / oil seal
Intermediate support / oil seals are recommended for use with probe
holders 203 mm (8 in.) or longer in length. They provide support and
aid in eliminating/minimizing probe holder resonances causing inaccurate probe measurements. These are for use with probe holders
with model numbers CMSS 911-0xx-xxx only.
Dimensions
140 mm
(5.50 in.)
99 mm
(3.88 in.)
1)
2)
8)
3)
216 mm
(8.50 in.)
4)
9,10)
5)
6)
11)
7)
12)
Intermediate support / oil seal
• Part number CMSS 31194501 (1-12 threads).
• Part number CMSS 31194500 (3/4 in. NPT threads).
25
Probe adapter
Part number 30221900 probe adapter 3/8-24 to 1/4-28 is used
when installing CMSS 61 and CMSS 65 probes in a probe holder
with 3/8-24 threads.
Ordering information
CMSS 911 Probe holder / dual sensor holder with housing.
Part number
Probe adapter
Jam nut
(reference only)
CMSS 61 and
CMSS 65 probe tip
assembly
(reference only)
CMSS 911–abc-ddd
a
0
1
2
3/8-24 CMSS 65 / CMSS 68 reverse mount standard2)
1/4-28 CMSS 65 standard3,4)
b
0
1
2
3
4
Dimension “B” adapter length
12,7 mm (0.5 in.) (standard)
63,5 mm (2.5 in.)2,6)
88,9 mm (3.5 in.)7)
38,1 mm (1.5 in.)8)
177,8 mm (7.0 in.)9)
c
0
1
6
7
Other options
None required
Probe holder without housing
Dual sensor with housing
Dual sensor without housing
ddd
Dimension “A” penetration depth10)
Standard lengths:11)
Short: 25,4 to 50,8 mm (1.0 to 2.0 in.)
Long: 50,8 to 127,0 mm (2.0 to 5.0 in.)
Non-standard lengths:10)
15,2 cm (6 in.)
17,8 cm (7 in.)
20,3 cm (8 in.)
22,9 cm (9 in.)
25,4 cm (10 in.)
27,9 cm (11 in.)
30,5 cm (12 in.)
33,0 cm (13 in.)
35,6 cm (14 in.)
38,1 cm (15 in.)
40,6 cm (16 in.)
43,2 cm (17 in.)
020
050
060
070
080
090
100
110
120
130
140
150
160
170
Probe thread1)
M10 × 1 CMSS 65 and CMSS 68
reverse mount with M10 × 1 case5)
Note: Customers are strongly encouraged to use the CMSS 65 /
CMSS 68 reverse mount eddy probe options when mounting probes in
CMSS 911 holders.
Note: With the ±17,8 mm (0.07 in.) adjustment, these length stingers
should meet all length requirements without trimming or cutting to
interim custom lengths (e.g., 9.3 in., 10.7 in., etc.).
Probe adapter 1/4–28 to 3/8–24 threads, part number 30221900 is required
and must be ordered separately when using CMSS 65 / CMSS 61 standard
eddy current probes with the larger diameter stingers.
2 This option does not require removal of connector of probe cable during field
assembly. CMSS 65 / CMSS 68 3/8–24 reverse mount eddy probe is
recommended configuration offered in either 5 or 8 mm versions.
3 This option size stinger only available in the standard 020 and 050 lengths.
4 Eddy probe connector must be removed and reinstalled when using this size
threaded stinger.
5 This option provides stingers with M10 × 1 probe threads and can be used with
CMSS 65 and CMSS 68 reverse mount probes with M10 × 1 thread cases.
6 Dimension A penetration depth will be 50,8 mm (2.0 in.) less than indicated.
7 Dimension A penetration depth will be 76,2 mm (3.0 in.) less than indicated.
8 Dimension A penetration depth will be 25,4 mm (1.0 in.) less than indicated.
9 Dimension A penetration depth will be 16,5 cm (6.5 in.) less than indicated.
10 Indicated depth is center of ±17,8 mm (0.7 in.) adjustment range for standard
CMSS 911 units. Indicated depth is ±12,7 mm (0.5 in.) adjustment range for
dual sensor units. API 670 recommends maximum of 20,3 cm (8 in.) of free
cantilevered length. Use intermediate support / oil seal for longer lengths.
11 Center of adjustment depth may be field cut within the indicated range.
1
26
CMSS 920
High pressure feedthrough
Introduction
The 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
the customer's specifications.
Dimensions
The CMSS 920’s bidirectional pressure rating of 2 000 psi enables
the unit to withstand both pressure and vacuum, a critical requirement for refrigeration units that are dehumidified under vacuum and
pressurized in normal operation. The 3/4 in. NPT mounting threads
on either end enable the CMSS 920 to be installed in a smaller hole.
An optional 1 in. NPT thread adapter is available and may replace
other high pressure feedthroughs with the CMSS 920.
ø 31,8 mm ø 38,1 mm
(1.25 in.) (1.50 in.)
High pressure side
Low pressure side
3/4 in. NPT both ends
Armor optional
Armor optional
Cable 1 high pressure end length
Cable 2 and 3 high pressure end length
Cable length
Cable length
Compatible CMSS 920 systems
Outside machine
Driver
Feedthrough
Eddy probe
CMSS 958-00-030 (3,0 m)
CMSS 920-x0xx-10xxxx-010 (1,0 m)
CMSS 65-00x-xx-xx-010 (1,0 m)
CMSS 68-00x-xx-xx-010 (1,0 m)
10 m systems: CMSS 668-1
CMSS 958-00-080 (8,0 m)
CMSS 920-x0xx-10xxxx-010 (1,0 m)
CMSS 65-00x-xx-xx-010 (1,0 m)
CMSS 68-00x-xx-xx-010 (1,0 m)
15 m systems: CMSS 668-2
CMSS 958-00-130 (13,0 m)
CMSS 920-x0xx-10xxxx-010 (1,0 m)
CMSS 68-00x-xx-xx-010 (1,0 m)
5 m systems:
CMSS 665
CMSS 668
Extension cable
Inside machine
Driver
Feedthrough
Eddy probe
CMSS 665
CMSS 668
CMSS 920-x0xx-45xxxx-000 (4,5 m)
CMSS 65-00x-xx-xx-05 (0,5 m)
CMSS 68-00x-xx-xx-05 (0,5 m)
27
Specifications
Physical
• Case material: Grade 303 stainless steel
• Mounting: Any position, 3/4 in. NPT threads
• Cable length of high pressure end: Increments of 0,1 m (3.9 in.);
recommend minimum of 0,2 m (7.9 in.)
• Cable quantity: One, two or three cables
• Cable armor: Available
• Customer ID: 38,1 mm (1.5 in.) clear heat-shrink
• Torque: 81 to 108 Nm (60 to 80 ft. lbs.)
Dynamic
• Pressure/Vacuum: 0 to 2 000 psi bidirectional
• Electrical cable length: As required to meet eddy probe system
configuration
Environmental
• Operating temperature range: –35 to +120 °C (–30 to +250 °F)
Ordering information
CMSS 920 High pressure feedthrough.
(SKF standard: CMSS 920-1000-100500-010)
Part number
CMSS 920–abcd-eeffgg-hij
a
1
2
3
Cable quantity
One cable
Two cables
Three cables
b
0
Environment
Standard
c
0
1
2
3
Armor
No armor
High pressure end armor
Low pressure end armor
Both ends armor
d
0
1
Case
Stainless steel
3/4 to 1 in. thread adapter
ee
10
40
45
Cable length (for CMSS 65 and CMSS 68)*
1,0 m (3.3 ft.)
4,0 m (13.1 ft.)
4,5 m (14.8 ft.)
ff
XX
00
Cable 1 high pressure end length
Increments of 0,1 m (3.9 in.), minimum 0,2 m (7.9 in.);
for example, 25 = 2,5 m (8.2 ft.)
Cable not used
gg
XX
00
Cables 2 and 3 high pressure end length
Increments of 0,1 m (3.9 in.), minimum 0,2 m (7.9 in.)
Cable not used
h
i
j
0
1
3
High pressure end connector
Low pressure end connector
Other options
Female (probe or driver mate)
Male (CMSS 958 extension cable mate)
No connector
* Use the configuration illustrations to determine length and compatible system.
Note: When ordering, customers are requested to provide information
to define the eddy probe system; this item will be used to facilitate
calibration.
28
Mounting devices, adapters and
packing glands
The basic design and construction of the eddy probes ensures long,
dependable service life. However, proper installation is essential;
once adjusted to its optimum position, a probe must be absolutely
immovable.
Standardized installation devices are offered for this specific purpose. They eliminate the chore of making special brackets or fixtures
for each installation. They also help ensure that every eddy probe
from SKF will continue to deliver all the accuracy built into it, year
after year.
CMSS 903 series
CMSS 903-3 probe holders, made of anodized aluminum, are similar to the CMSS 903-1, but are designed to hold CMSS 65 series
eddy probes and, in addition, permit final adjustment where it is not
possible to turn the probe itself. This is especially convenient for
installation of probes with armored or otherwise protected leads.
The probe is threaded into a sleeve, which mates with a left-hand
thread in the main body of the holder. Turning the sleeve then sets
the probe position; it is not necessary to turn the probe itself. Both
holder and sleeve are slotted to ensure a firm grip on the probe.
Mounting holes accommodate two 4,8 mm (0.19 in. or #10) high
tensile Allen head cap screws with safety wire holes (not provided).
Mounting brackets
CMSS 903 mounting brackets are used in those installations
requiring probe mounting in the machine’s internal area.
CMSS 903-1 probe holders, made of anodized aluminum, are
used to install CMSS 68 series eddy probes on flat machine surfaces. Threaded (3/8-24) and slotted, they ensure a firm grip on the
probe, once it is adjusted to final operating position. Two mounting
holes accommodate 4,8 mm (0.19 in. or #10) high tensile Allen
head cap screws (not provided), which are normally secured with
safety wires.
CMSS 903-2 probe holders, made of stainless steel, are used for
installing CMSS 65 series eddy probes on flat machine surfaces
when space is at a premium. They are threaded (1/4-28) and slotted
to ensure a firm grip after final adjustment. Mounting holes accommodate two 3,5 mm (0.14 in. or #6) high tensile Allen head cap
screws with safety wire holes (not provided).
(From left to right) CMSS 903 series probe adapters: CMSS 903-1 probe
holder; CMSS 903-3 probe holder; CMSS 903-2 probe holder.
29
Dimensions
Front view
Side view
Top view
19,0 mm
(0.75 in.)
22,0 mm
(0.88 in.)
31,0 mm
(1.25 in.)
13,0 mm
(0.50 in.)
CMSS 903-1 mounts CMSS 68 series probes (3/8–24 case).
Dimensions
Front view
Side view
Top view
5,0 mm (0.20 in.)
8,0 mm
(0.30 in.)
6,0 mm
(0.25 in.)
22,0 mm
(0.88 in.)
16,0 mm
(0.63 in.)
CMSS 903-2 mounts CMSS 65 series probes (1/4–28 case).
Dimensions
Front view
Side view
31,0 mm
(1.25 in.)
13,0 mm
(0.50 in.)
Top view
Sleeve
19,0 mm
(0.75 in.)
CMSS 903-3 mounts CMSS 65 series probes (1/4–28 case).
30
22,0 mm
(0.88 in.)
CMSS 30112000 series
Ordering information
Cable packing gland assembly
The CMSS 30112000 series cable packing gland assembly offers a
splash-proof cable exit from the machine case. They are available in
one or two cable exit versions and with either a 1/2 in. or 3/4 in. NPT
male thread for screwing into the machine housing. It is an effective
and easily installed low pressure (0,41 MPa; 60 psi) seal. The internal
oil-resistant neoprene packing, as well as washers, are split to allow
cable installation without connector removal.
The cable packing glands are typically used for exiting the eddy
probe cable or extension cable for internally installed eddy probes.
The cable packing gland will not provide a seal for armored cables.
CMSS 30112000 Single cable packing gland with 1/2 in. NPT fitting for
cables of 0.125 in. or 0.257 in. diameter.
CMSS 30112000-SPAREKIT Replacement packing elements for
rebuild/reuse of the associated housing.
CMSS 30112001 Two cable packing gland with 1/2 in. NPT fitting for
cables of 0.125 in. diameter.
CMSS 30112001-SPAREKIT Replacement packing elements for
rebuild/reuse of the associated housing.
CMSS 30112003 Single cable packing gland with 3/4 in. NPT fitting for
cables of 0.125 in. or 0.257 in. diameter.
CMSS 30112004 Two cable packing gland with 3/4 in. NPT fitting for
cables of 0.125 in. diameter.
CMSS 30112006* Two cable packing gland with 1/2 in. NPT fitting for
cables of 0.125 in. and 0.200 in. diameter each.
CMSS 30112006-SPAREKIT Replacement packing elements for
rebuild/reuse of the associated housing.
* The CMSS 30112006 and 30112007 models have split washers that can
accommodate an eddy probe cable and an accelerometer / velocity transducer
cable for internal installations of absolute vibration transducers.
Dimensions
Split washers
1/2 in. NPT
Neoprene
packing
1.38 in. hex
Split washers
internal
thread for
conduit
installation
30,5 mm
(1.20 in.)
ø 3.0 mm
(0.12 in.)
Fluorine based
Set screw
polymer washers
1/2 in. NPT or
3/4 in. NPT
43,5 mm
(1.70 in.)
63,5 mm (2.50 in.)
CMSS 30837800
1/2 or 3/4 in. NPT probe adapter
The probe adapter is used to mount a probe with a 1/4-28 or 3/8-24
thread in a machine case that will accept the 1/2 or 3/4 in. NPT fitting.
Conduit or a junction box may be mounted on the exterior side of the
adapter.
Dimensions
Ordering information
CMSS 30837800 3/8-24 internal thread for CMSS 68 style probes;
1/2 in. NPT external thread.
CMSS 30837801 1/4-28 internal thread for CMSS 65 style probes;
1/2 in. NPT external thread.
CMSS 30837802 3/8-24 internal thread for CMSS 68 style probes;
3/4 in. NPT external thread.
CMSS 30837803 1/4-28 internal thread for CMSS 65 style probes;
3/4 in. NPT external thread.
1/2 in. NPT or
3/4 in. NPT
1/4-28 thread or
3/8-24 thread
31
Drivers: explosion-proof and
weather-proof housings
CMSS 31091700
Explosion-proof housings for DIN-rail mount drivers
Explosion-proof housings
Explosion-proof and dust-tight housings:
•
•
•
•
Class I, Groups C and D
Class II, Groups E, F and G
Class III, UL standard 886
CSA standard C22.2, number 30 1970
The explosion-proof housing is designed for use in environments
classified as hazardous. The housing is manufactured of aluminum
alloy with a copper content less than 0,3% maximum. On three sides
the bosses are drilled and tapped for 3/4 in. NPT conduit fittings. The
dome type housing is specified requiring a minimum of floor space
for fixture mounting.
Specifications
•
•
•
•
•
Dimension “A” inside dome: 26,0 cm (10.25 in.)
Dimension “B” overall height: 29,0 cm (11.44 in.)
Diameter cover opening: 17,5 cm (6.88 in.)
Mounting hole size: 1,1 cm (0.44 in.)
Weight: 6,5 kg (15 lb.)
Dimensions
20,0 cm
(7.88 in.)
20,0 cm
(7.88 in.)
16,2 cm
(6.38 in.)
The units come with all hardware ready for assembly and installing
the drivers.
Note: Please refer to reference information in the back of this catalog for
definitions, standards and cross references.
Ordering information
CMSS 31091700 Explosion-proof housing for Ryton DIN-rail mount
drivers, for a maximum of four drivers.
32
ø 1,1 cm
(0.44 in.)
“A”
26,0 cm
(10.25 in.)
16,2 cm
(6.38 in.)
“B”
29,0 cm
(11.44 in.)
Weather-proof housings
Weather-proof housing (NEMA 4 and 4X)
• Meets requirements for NEMA Type 4, Type 4X, Type 12 and
Type 13
• UL 508 Type 4 and Type 4X
• CSA Type 4
• IEC 529, IP66 (European Standard)
Weather-proof housings for protection from
adverse environmental conditions
The SKF Condition Monitoring product line offers three types of
housings to provide protection from adverse environmental conditions for DIN-rail mountable eddy probe drivers.
Water-resistant housing
Enclosures are intended for indoor or outdoor use primarily to
provide a degree of protection against corrosion, windblown dust and
rain, splashing water and hose-directed water; undamaged by the
formation of ice on the enclosure. The housings are constructed of
14 or 16 gauge steel with seams continuously welded. Holes and
cable clamp fittings are provided. The cover is held in place by steel
clamps on four sides of the cover to assure water tight integrity.
There is an oil-resistant gasket held in place with oil-resistant
adhesive. The finish is ANSI 61 gray polyester powder coating. This
housing meets NEMA 4 criteria.
Water- and corrosion-resistant housing
(stainless steel)
This housing meets the same criteria as the water-resistant housing
in addition to being manufactured of stainless steel to meet the corrosion-resistant criteria. The finish is unpainted polished surface.
This housing meets NEMA 4X criteria.
Note: Please refer to reference information in the back of this catalog for
definitions, standards and cross references.
Ordering information
Weather-proof housings for Ryton DIN-rail mount drivers.
CMSS 31092100* Weather-proof housing for maximum three drivers.
CMSS 31092200* Weather-proof housing for maximum six drivers.
CMSS 31092300* Weather-proof housing for maximum ten drivers.
• Area classification – (clamp cover)
– NEMA/EEMAC Type 4, Type 12 and Type 13
– UL50 Type 4, Type 12, Type 13
– UL508 Type 4, Type 12, Type 13
– CSA Type 4
– IEC 529, IP66
CMSS 31092101* Weather-proof housing for maximum three drivers.
CMSS 31092201* Weather-proof housing for maximum six drivers.
CMSS 31092301* Weather-proof housing for maximum ten drivers.
• Area classification – (stainless steel, clamp cover)
– NEMA/EEMAC Type 4, Type 4X, Type 12 and Type 13
– UL50 Type 4, Type 4X
– UL508 Type 4, Type 4X
– CSA Type 4, Type 4X
– IEC 529, IP66
CMSS 31092103* Weather-proof housing for maximum three drivers.
CMSS 31092203* Weather-proof housing for maximum six drivers.
CMSS 31092303* Weather-proof housing for maximum ten drivers.
• Area classification – (stainless steel, continuous hinge on one
side, clamps on other three sides of cover)
– NEMA/EEMAC Type 4, Type 4X, Type 12 and Type 13
– UL50 Type 4, Type 4X
– UL508 Type 4, Type 4X
– CSA Type 4, Type 4X
– IEC 529, IP66
* If it is desired to order a housing with “no holes”, then add “–NH” to the right of
the model number, e.g., CMSS 31092100-NH.
33
Weather-proof housing
dimensions
Dimensions
19,0 mm
(0.75 in.)
19,0 mm
(0.75 in.)
A
Note: Due to changes in housing manufacturer
specifications, cover clamps may be located in
positions other than depicted in these drawings.
B
ø 8,0 mm
(0.31 in.)
E
D
Dimensions
33,0 mm
(1.31 in.)
W
Clamp style
C
12 gauge
L
B
W
Hinge style
C
32,0 mm (1.25 in.)
12 gauge
B
L
Table 5
Weather-proof housing dimensions
SKF model number
Box size “A” × “B” × “C”
Mounting “D” × “E”
Clamp style overall “L” × “W”
Hinge style overall “L” × “W”
CMSS 31092100
CMSS 31092101
CMSS 31092103
203 × 152 × 89 mm
(8.00 × 6.00 × 3.50 in.)
222 × 102 mm
(8.75 × 4.00 in.)
241 × 187 mm
(9.50 × 7.38 in.)
241 × 176 mm
(9.50 × 6.94 in.)
CMSS 31092200
CMSS 31092201
CMSS 31092203
254 × 203 × 102 mm
(10.00 × 8.00 × 4.00 in.)
273 × 152 mm
(10.75 × 6.00 in.)
292 × 238 mm
(11.50 × 9.38 in.)
292 × 227 mm
(11.50 × 8.94 in.)
CMSS 31092300
CMSS 31092301
CMSS 31092303
305 × 254 × 127 mm
(12.00 × 10.00 × 5.00 in.)
324 × 203 mm
(12.75 × 8.00 in.)
343 × 289 mm
(13.50 × 11.38 in.)
343 × 278 mm
(11.50 × 10.94 in.)
34
Calibrator
CMSS 601 series
Static calibrator
The CMSS 601 field calibrator provides a convenient, precise method
for verifying the voltage output versus the gap of an eddy probe and
driver combination. It is especially useful for applications requiring
exact calibration (the hot alignment of machinery) or where “targets”
of various metal alloys are used.
As recommended by API Standard 670, the CMSS 601 can be
used for calibrating an eddy probe on the actual shaft it will monitor.
The calibrator’s self-centering magnetic base holds the pickup rigidly
at 90° to the shaft axis to provide reliable performance characteristics on its “real target”. The metal disc supplied with the calibrator
may be placed across the V-shaped base as a standardized flat calibration target.
Precision results … easy-to-use
1 An eddy probe is locked into the proper size adapter with the set
screw.
2 The adapter and probe cable are slipped upward through the
magnetic base and over the micrometer spindle.
3 The magnetic base is placed on a machine shaft or on the target
disc.
4 The probe lead is connected to a matching eddy probe driver
through an extension cable.
5 –24 V DC is applied to the driver; the driver's output is connected
to a voltmeter.
6 The micrometer spindle is set to read 40 mils.
7 The adapter and probe are vertically positioned to produce a
–8 V DC voltmeter reading and then locked in position on the
micrometer spindle by the upper set screw. The unit is now ready
for use.
To calibrate an eddy probe, the spindle is lowered by the micrometer
head to a reading of 10 mils and a voltage reading taken. Readings
are taken successively at 5 or 10 mil increments. Fine tuning is available with the calibrate potentiometer on the driver.
The CMSS 601-1 is supplied as a portable kit, complete with standard
target disc, an Allen wrench and two adapters to accommodate both
CMSS 65 and CMSS 68 eddy probes.
Ordering information
CMSS 601-1 Static calibrator: Standard (Imperial units).
CMSS 601-2 Static calibrator: Metric version (Metric units).
CMSS 601-8 Static calibrator: Metric version for long probe cases, over
60 mm (2.4 in.)* (Metric units).
* Calibrators for long probes use integral target only; will not observe actual shaft.
35
Typical eddy probe arrangement
plans, bearing housing mounting
and axial probe installation
Typical eddy probe arrangement
plans
ø
Turbine
Item
P1
P2
3Y
4X
5Y
6X
Ø
R
T
JB
Description
Axial position probe (instrument manufacturer ID data)
Axial position probe (instrument manufacturer ID data)
Low pressure end radial vibration probe, 45° off top dead
center (TDC) (instrument manufacturer ID data)
Low pressure end radial vibration probe, 45° off TDC
(instrument manufacturer ID data)
High pressure end radial vibration probe, 45° off TDC
(instrument manufacturer ID data)
High pressure end radial vibration probe, 45° off TDC
(instrument manufacturer ID data)
Phase reference probe, 45° off TDC (instrument
manufacturer ID data)
Radial bearing (description)
Thrust bearing (description)
Junction box
Note: The numbering system shown is based on the higher pressure end
equaling a higher device number.
R
4X
3Y
Active
thrust
Turbine
3
5Y
6X
R
T
P1
P2
Counter-clockwise
rotation viewed here
36
4
Ø
5
2
6
1
JB
Compressor
Item
P1
P2
3Y
4X
5Y
6X
Ø
R
T
JB
Description
Axial position probe (vendor and model number)
Axial position probe (vendor and model number)
Low pressure end radial vibration probe, 45° off TDC
(vendor and model number)
Low pressure end radial vibration probe, 45° off TDC
(vendor and model number)
High pressure end radial vibration probe, 45° off TDC
(vendor and model number)
High pressure end radial vibration probe, 45° off TDC
(vendor and model number)
Phase reference probe, 45° right of TDC (vendor and
model number)
Radial bearing (description)
Thrust bearing (description)
Junction box
P2
P1
T
6X
5Y
R
Active
thrust
Centrifugal
compressor
5
6
3
4
R
Note: The numbering system shown is based on the higher pressure end
equaling a higher device number.
Ø
2
1
JB
4X
3Y
Ø
Counter-clockwise
rotation viewed here
Electric motor
Item
3Y
4X
5Y
6X
Ø
T1
T2
R
JB
Description
Coupling end Y radial vibration probe, 45° off TDC
(instrument manufacturer ID data)
Coupling end X radial vibration probe, 45° off TDC
(instrument manufacturer ID data)
Outboard end Y radial vibration probe, 45° off TDC
(instrument manufacturer ID data)
Outboard end X radial vibration probe, 45° off TDC
(instrument manufacturer ID data)
Phase reference probe, 45° right of TDC (instrument
manufacturer ID data)
Outboard end bearing temperature
Coupling end bearing temperature
Radial bearing (description)
Junction box
Ø
3Y
4X
T2
R
Motor
T2
Ø
4X
3Y
5Y
T1
JB
T1
R
5Y
6X
6X
Counter-clockwise
rotation viewed here
37
Pump
Item
A1
A2
R
T
JB
Description
Coupling end radial horizontal accelerometer, 90° off TDC
(instrument manufacturer ID data)
Outboard end radial vibration accelerometer, 90° off TDC
(instrument manufacturer ID data)
Radial bearing (description)
Thrust bearing (description)
Junction box
T
A2
Pump
A2
A1
JB
A1
R
Counter-clockwise
rotation viewed here
Gearbox (double helical gear)
Item
A1
A2
P1
P2
3Y
4X
5Y
6X
Ø1
Ø2
R
T
JB
Description
Input shaft coupling end horizontal radial acceleration, 90°
off TDC (instrument manufacturer ID data)
Output shaft coupling end horizontal radial acceleration,
90° off TDC (instrument manufacturer ID data)
Input shaft thrust bearing end axial position probe #1,
(instrument manufacturer ID data)
Output shaft thrust bearing end axial position probe #2,
(instrument manufacturer ID data)
Input shaft coupling end Y radial vibration probe, 45° off
TDC (instrument manufacturer ID data)
Input shaft coupling end X radial vibration probe, 45° off
TDC (instrument manufacturer ID data)
Output shaft coupling end Y radial vibration probe, 45° off
TDC (instrument manufacturer ID data)
Output shaft coupling end X radial vibration probe, 45° off
TDC (instrument manufacturer ID data)
Input shaft non-coupling end phase reference probe at
TDC (instrument manufacturer ID data)
Output shaft non-coupling end phase reference probe at
TDC (instrument manufacturer ID data)
Radial bearing (description)
Thrust bearing (description)
Junction box
Note: Oscillator-demodulators and accelerometer signal conditioners should
be located in separate junction boxes.
Note: For a single helical gear, a pair of axial probes should be installed at
each thrust bearing end.
38
Ø1
5Y
P1
6X
T
Gear
A2
R
R
R
A1
R
Ø2
P2
3Y
4X
A2
Ø1
6X
P1
5Y
A1
Ø2
3Y
P2
4X
JB
Counter-clockwise
rotation viewed here
Bearing housing
mounting
Steps
1 Drill and tap housing for 19.0 mm
(0.75 in.) thread (typical).
2 Set sealing adapter tight in bearing
housing before pulling lead wires.
3 Identify leads prior to installation; use tag
numbers as required.
4 Probes must be mounted perpendicular to
shaft.
5 Do not pull thermocouple wire and probe
lead wires into the same outlet without
your Engineering Department's approval.
6 Check gap voltage after CMSS 911
assembly has been installed; set gap at
–8.0 in. ±0,5 V (40 ±2.5 mils).
7 Torque mating connectors to 1,02 Nm,
±0,04 Nm (145 in. oz., ±5 in. oz.), then
wrap connections with fluorine based
polymer tape (typical).
8 Drill 6.4 mm (0.25 in.) drain hole in lowest
point of box (typical).
End view
1/2 in. flex conduit “sealtite”
3) Typical
3/4 to 1/2 in. reduction
or equivalent (typical)
bushing (typical)
2
1
7
CMSS 911 extension
(use as required)
8
4, 6
Rotation
Side view
CMSS 911 assembly (typical)
3
7
8
Thermocouple wire
2
1
4
6
Radial bearing
Thrust collar
Thrust bearing
39
Axial probe installation
Dimensions
Thrust probe installation
recommendations
• At least two probes per rotor are
recommended.
• Where the probes cannot be changed
without shutting down the machine,
install spare probes.
• Calibrate probe, cable and driver and
record final response curves for primary
as well as spare probes. The SKF
CMSS 601 static calibrator may be used.
• Try to observe the thrust collar with one
probe and the shaft with the other.
• Probes must be mounted within 30,5 cm
(1 ft.) of the thrust collar.
• Avoid mounting probes through thin
plates or bell housings that may bow with
thermal expansion.
• Determine the float zone of the rotor by
jacking the rotor in both directions. Use up
to two tons of pressure.
• Measure the rotor movement with dual
indicators on the shaft, the eddy probe
voltage change at the driver and the
monitor reading (all three should agree).
• Jack the shaft several times each way to
verify readings.
• Set the probe gap so that the center of the
probe’s range is in the center of the float
zone.
• Securely lock the probe and any adapters
in place.
• Be sure the probe tip has a side clearance
of at least 5 mm (0.20 in.).
40
117 mm
(4.62 in.)
CMSS 912 dual
thrust assembly
168 mm
(6.62 in.)
3
(typical)
Recommended
minimum thickness
is 3/8 in.
1/2 in. conduit hub
Working range
Bell housing
Use Loctite
on threads
Surface must be free of stencil
marks and other discontinuities
Steps
1 Set sealing adapter tight in housing before
pulling lead wires through.
2 Probe lead wires must be secured against
internal whipping and rubbings.
3 Identify probe leads prior to installation;
use tag numbers as required.
4 Probes must be mounted perpendicular to
shaft or surface it is “seeing”.
5 Do not pull thermocouple wires and probe
lead wires into the same outlet without
your Engineering Department's approval.
6 Check gap volts after CMSS 911 or
CMSS 912 assemblies have been
installed.
7 Set gap at midpoint of probe range at the
center of the shaft float zone.
8 Torque mating connectors to 1,02 Nm,
±0,04 Nm (145 in. oz., ±5 in. oz.), then
wrap connectors with fluorine based
polymer tape.
Dimensions
Axial probe
Key
phasor
probe
Axial
probe
2
41
Outline dimensions
5 mm and 8 mm eddy probe outline dimensions
Dimensions
1,0 m (40.00 in.) nominal
±0,125 m / 0,175 m
Max: 1,2 m (45.00 in.)
(±4.92 in. / 6.89 in.)
Min: 0,8 m (33.00 in.)
76,2 mm
ø 2,5 mm
(3.00 in.)
(ø 0.10 in.)
50,8 mm
(2.00 in.)
19,0 mm
(0.75 in.)
6,4 mm
(0.25 in.)
3
1/4 in. hex
7/32 in. wrench flats
ø 7,1 mm (0.28 in.)
maximum
9
177,8 mm, ±25,4 mm
(7.00 in., ±1.00 in.)
5, 7
9
76,2 mm
(3.00 in.)
9
25,4 mm
(1.00 in.)
Notes
1
2
3
4
5
6
7
8
9
Cable shown with and without flex armor.
Drawing applicable to CMSS 65 and CMSS 68.
Clear shrink tubing for label identification.
13 mm for M8 × 1 thread probe case (7/16 in. for 1/4-28 thread
probe case).
17 mm for M10 × 1 thread probe case (9/16 in. for 3/8-24 thread
probe case).
Probe case length dependent upon probe model number.
8 mm (0.31 in.) for CMSS 68; 5 mm (0.20 in.) for CMSS 65.
1/4-28 or 3/8-24 according to probe model number.
All information applies to both models unless otherwise specified.
Armored model only.
42
6
9
ø 7,0 mm (0.25 in.)
maximum
4
Wrench flats:
3/16 in. for 1/4-28
5/16 in. for 3/8-28
5 mm and 8 mm eddy probe driver outline dimensions
Dimensions
4 × ø 6,35 mm (0.25 in.) clearance hole
for mounting with 10-32 hardware,
machine screws 34,93 mm (1.38 in.)
minimum length
6,35 cm
(2.50 in.)
“C” DINrail
mount
4,95 cm
(1.95 in.)
1,52 cm
(0.60 in.)
-24V
GND
SIG
GND
MADE IN U.S.A.
by
SKF Condition Monitoring
“C” DINrail
6,35 cm
(2.50 in.)
8 mm
DISPLACEMENT
PROBE DRIVER
S/N
-24V
7,62 cm
(3.00 in.)
CMSS668
2,79 cm
(1.10 in.)
5
9,91 cm
(3.90 in.)
4
Removable or permanent fixed connector:
Terminal strip type rated for 250 V, 10 A,
14 AWG maximum wire size
Removable
neoprene plug
Connector:
Stainless steel
jack-type mates
with CMSS 958
extension cable
4,06 cm
(1.60 in.)
1 2 3 4 5
7,62 cm
(3.00 in.)
This outline drawing applies to the
following drivers:
• CMSS 665 and CMSS 665P series
• CMSS 668 and CMSS 668P series
2,54 cm
(1.00 in.)
Notes
1 Operating temperature range: –35 to +65 °C
(–30 to +150 °F)
2 Storage: –40 to +65 °C (–45 to 150 °F)
Material: Case made from Ryton
3 Units interchangeable without recalibration.
4 Probe driver five-terminal connector shown; removable or
permanent fixed connectors available.
5 Access hole for fine trimming of calibration on probe drivers or for
range selection on transmitter units.
43
19 mm eddy probe outline dimensions
Dimensions
Supplied with jam nut
1.5 in. across flats
Probe tip
Wrench flats,
20 mm (13/16 in.)
HS180/U
Coaxial
cable
ø 19,1 mm
(0.75 in.)
Optional:
Stainless steel flex
armor, inside bend
radius 1.25 in.
15,2 mm
(0.60 in.)
76,2 mm
(3.00 in.)
Floating
sleeve for
user ident
2,0 m
(6.6 ft.)
nominal
152,4 mm
(6.00 in.)
Probe case stainless steel
threaded, 1-12 UNF 2A
2,0 m
(6.6 ft.)
nominal
ø 38,1 mm
(1.50 in.)
33,3 mm
(1.31 in.)
Mounting surface
ø 28,575 mm
(1.125 in.)
120° (typical)
Drill and tap 8-32 UNC-2B × 0.312 in.
deep (minimum), 3 places as shown
44
19 mm eddy probe driver outline dimensions
Dimensions
Connector:
Stainless steel jack-type
mates with M900
extension cable
ø 6.4 mm (0.25 in.)
clearance hole for
mounting with #10
hardware
63,5 cm
(2.50 in.)
1)
Fast tabs
63,5 cm
(2.50 in.)
76,2 mm
(3.00 in.)
76,2 mm
(3.00 in.)
6-32 terminals
Trim pot limited to
±5% adjustment
50,8 mm
(2.00 in.)
maximum
height
Notes
1 Install fast tabs at terminals for the convenience of field measuring
instruments.
2 Units are interchangeable without need for recalibration of the
system.
3 Housing material: aluminum (CMSS 620-2) or stainless steel
(CMSS 620-6)
4 Operating temperature range: –35 to +65 °C (–30 to +150 °F)
Storage: –40 to +95 °C (–40 to 200 °F)
45
CMSS 958 extension cable outline dimensions
Dimensions
Standard length
Nominal 4,0 m, ±0,4 m
(13.12 ft., ±1.50 ft.)
76,2 mm
(3.00 in.)
Black shrink
tubing (2 pls)
ø 2,5 mm
(ø 0.10 in.)
50,8 mm
(2.00 in.)
P1
P2
2
8 Stainless steel flex armor
1/4 in. hex
ø 6,4 mm
(ø 0.25 in.)
2
7/32 in. hex
1/4 in. hex
P1
8
177,8 mm, ±25,4 mm
(7.00 in., ±1.00 in.)
ø 7,1 mm
(ø 0.28 in.)
maximum
8
228,6 mm
(9.00 in.)
Notes
1 Cable shown with and without flex armor.
2 Clear shrink tubing for label identification.
3 Operating temperature range: –35 to +120 °C
(–30 to +250 °F)
Storage: –40 to +120 °C (–45 to +250 °F)
4 Bend radius 34,9 mm (1.38 in.) minimum (armored). Bend radius
19,0 mm (0.75 in.) minimum (non-armored).
5 High strength steel coax with steel braid shield.
6 Installation direction not restricted (reversible).
7 All information applies to both models unless otherwise specified.
8 Armored model only.
46
8
38,1 mm
(1.50 in.)
P2
Black shrink
tubing (4 pls)
CMSS 900 extension cable outline dimensions
Dimensions
8,8 m (28.87 ft.)
nominal
76,2 mm
(3.00 in.)
Black shrink
tubing (2 pls)
HS180/U
Coaxial cable
50,8 mm
(2.00 in.)
P1
P2
2
8 Stainless steel flex armor
1/4 in. hex
ø 6,4 mm
(ø 0.25 in.)
2
7/32 in. hex
1/4 in. hex
P1
8
177,8 mm, ±25,4 mm
(7.00 in., ±1.00 in.)
ø 7,1 mm
(ø 0.28 in.)
maximum
8
228,6 mm
(9.00 in.)
8
38,1 mm
(1.50 in.)
P2
Black shrink
tubing (4 pls)
Notes
1 Cable shown with and without flex armor.
2 Clear shrink tubing for label identification.
3 Operating temperature range: –35 to +120 °C
(–30 to +250 °F)
Storage: –45 to +175 °C (–45 to +350 °F)
4 Bend radius 34,9 mm (1.38 in.) minimum (armored).
Bend radius 19,0 mm (0.75 in.) minimum (non-armored).
5 High strength steel coax with steel braid shield.
6 Installation direction not restricted (reversible).
7 All information applies to both models unless otherwise specified.
8 Armored model only.
47
Agency approvals and hazardous
area information
CE mark
European Community Declaration of Conformity.
Manufacturer:
SKF USA Inc.
5271 Viewridge Court
San Diego, California 92123 USA
Product: Eddy current probe systems from SKF
SKF USA Inc. of San Diego, California, USA, hereby declares that the
referenced product, to which this declaration relates, is in conformity
with the provisions of:
• Council Directive 89/336/EEC (3 May 1989), on the Approximation
of the Laws of the Member States Relating to Electromagnetic
Compatibility, as amended by:
– Council Directive 92/31/EEC (28 April 1992)
– Council Directive 93/68/EEC (22 July 1993)
The above-referenced product complies with the following standards
and/or normative documents:
• EN 50081-2, Electromagnetic compatibility – generic emission
standard. Part 2: Industrial environment (August 1993).
• EN 50082-2, Electromagnetic compatibility – generic immunity
standard. Part 2: Industrial environment (March 1995).
Hazardous area information
Area general information
Review the Hazardous Location Information section to properly
define the area in which the sensors and monitoring systems are to
be installed, then determine which equipment will meet the specified
requirements.
Sensors may either be installed in a Class I, Division 1 (Zone 0, 1)
or a Division 2 (Zone 2) hazardous area. However, for installation in
these areas, the sensors must be approved by an appropriate
agency.
SKF does have eddy probe sensor systems approved for installation in these areas and specific model numbers assigned to easily
identify these agency approved options.
48
It is strongly recommended that intrinsic safety barriers be used
for the hazardous area installations as the means of limiting the
thermal and electrical energy to the sensor components in
Class I, Division 1 (Zone 0, 1) and Division 2 (Zone 2) hazardous
areas. The agency approved intrinsic safe sensor components
and the intrinsic safety barriers provide for a very high level of
safety and aid in the prevention of fire and explosions in your
facility.
In field installations, it is recommended that housings be used to
provide physical protection for the eddy probe drivers. For CENELEC
approved systems, these housings should have a minimum rating of
IP20. Other agency approvals do not specify a level of protection for
the housings. However, SKF does provide a series of standard housings that can be used for these installations.
Agency approvals
SKF USA Inc. has obtained approvals from the following agencies:
Certified by SIRA to ATEX directive
SIRA intrinsically safe certified equipment is intended
for use in Zone 0, 1 as intrinsically safe in accordance
with CENELEC European harmonized Standards,
[EN50 014 (1977) and EN50 020 (1977)] and is accepted by
member countries of Austria, Belgium, Denmark, Finland,
France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
United Kingdom.
Canadian Standards Association – CSA
CSA intrinsically safe certified equipment is intended
for use in Class I, Division 1, Groups A, B, C, D.
Factory Mutual Research, USA – FM
FM intrinsically safe and non-incendive certified
equipment is intended for use in Class I, Division 1
and Division 2, Groups A, B, C, D.
To order eddy probe systems with the various agency
approvals, please refer to the specific eddy probe model number
desired in this catalog, e.g., CMSS 65 or CMSS 68 systems. There
is an Options Form available that delineates the specific agency
approval desired. Select the appropriate agency approval and the
additional configuration requirements for the eddy probe and
extension cable. Then select the appropriate driver model number indicated on the following pages.
Intrinsic Safety (I-S) barriers
For use with the CMSS 65 and CMSS 68 series eddy probe systems
The following information provides a listing of the intrinsic safety barriers used by the various testing agencies during the eddy probe approval
process. As such, these barriers meet the various agency approvals and allow for the proper operation of the eddy probe systems when properly installed in the hazardous areas. Also included are the parameters for selecting other manufacturers' barriers. However, only the brand
named barriers listed have been tested and are verified to work properly with the CMSS 65 and CMSS 68 eddy probe systems.
Factory Mutual – (FM)
Intrinsically safe for Class I,
Division 1, Groups A, B, C, D
Canadian Standards
Association – CSA
Intrinsically safe for Class I,
Division 1, Groups A, B, C, D
Entity parameters
• Supply terminals:
– Vmax = 30 V DC
– Imax = 245 mA
– Ci = 0,056 μF
– Li = 0,536 mH
• Signal terminals:
– Vmax = 24 V DC
– Imax = 60 mA
– Ci = 0 μF
– Li = 0 mH
SKF drawing number 31187500 is
applicable.
System approval
Certified by SIRA to ATEX
Directive (CENELEC standard)
Intrinsic safe code (see below)
System approval
Intrinsic safe code EEx ia IIC T2.
Barriers:
• Power/Signal: MTL 796 Dual (neg)
SKF drawing number 31451400 is
applicable.
Measurement Technology Ltd., (MTL)
Eddy probe approval
SKF drawing number 31163200 is
applicable.
NOTE: All intrinsic safety installations
should be done in accordance with the
national installation codes of practice for the
particular country at the place of installation.
Intrinsic safe code EEx ia IIC T2,
Ta = 100 °C (210 °F)
Driver approval
• Power/Signal: MTL 796 Dual (neg)
• Intrinsic safe code EEx ia IIC T4,
Ta = 75 °C (135 °F)
– Vmax:in = 28 V DC
– Imax:in = 138 mA DC
– Pmax:in = 1,0 W
– Ceq = 0,06 μF
– Leq = 0,5 mH
Measurement Technolog Ltd., (MTL)
Suggested barriers
System approval
Barriers:
• Power/Signal: MTL796 Dual (neg)
SKF drawing number 31163200 is
applicable.
Measurement Technology Ltd., (MTL)
NOTE: All intrinsic safety installations
should be done in accordance with the
national installation codes of practice for the
particular country at the place of installation.
NOTE: All intrinsic safety installations
should be done in accordance with the
national installation codes of practice for the
particular country at the place of installation.
49
Classes and divisions
Hazardous locations are those areas where a potential for explosion
and fire exists because of flammable gases, vapors or finely pulverized dusts in the atmosphere, or because of the presence of easily
ignitable fibers or flyings. Hazardous locations may result from the
normal processing of certain volatile chemicals, gases, grains, etc., or
they may result from accidental failure of storage systems for these
materials. It is also possible that a hazardous location may be created
when volatile solvents or fluids, used in a normal maintenance routine, vaporize to form an explosive atmosphere.
Regardless of the cause of a hazardous location, it is necessary
that every precaution be taken to guard against ignition of the atmosphere. Certainly no open flames would be permitted in these locations, but what about other sources of ignition?
Electrical sources of ignition
A source of ignition is simply the energy required to touch off an
explosion in a hazardous location atmosphere.
Electrical equipment such as lighting fixtures and motors are classified as “heat producing”, and they will become a source of ignition if
they reach a surface temperature that exceeds the ignition temperature of the particular gas, vapor or dust in the atmosphere.
It is also possible that an abnormality or failure in an electrical system could provide a source of ignition. A loose termination in a splice
box or a loose lamp in a socket can be the source of both arcing and
heat. The failure of insulation from cuts, nicks or aging can also act as
an ignition source from sparking, arcing and heat.
Hazardous locations and the National
Electrical Code*
The National Electrical Code (NEC) treats installations in hazardous
locations in articles 500 through 517.
Each hazardous location can be classified by the definitions in the
NEC. Following are interpretations of these classifications and
applications.
Class I, Division 2
These are Class I locations in which volatile flammable liquids or gases are handled, processed or used, but in which they will normally be
confined within closed containers or closed systems from which they
can escape only in the case of accidental rupture or breakdown of the
containers or systems. The hazardous conditions will occur only
under abnormal conditions.
Class II locations
Class II locations are those that are hazardous because of the presence of combustible dust.
Class II, Division 1
These are Class II locations where combustible dust may be in suspension in the air under normal conditions in sufficient quantities to
produce explosive or ignitable mixtures. This may occur continuously,
intermittently or periodically. Division 1 locations also exist where
failure or malfunction of machinery or equipment might cause a hazardous location to exist while providing a source of ignition with the
simultaneous failure of electrical equipment. Also included are locations in which combustible dust of an electrically conductive nature
may be present.
Class II, Division 2
A Class II, Division 2 location is one in which combustible dust will not
normally be in suspension in the air and normal operations will not
put the dust in suspension, but where accumulation of the dust may
interfere with the safe dissipation of heat from electrical equipment
or where accumulations near electrical equipment may be ignited by
arcs, sparks or burning material from the equipment.
Class III locations
Class III locations are those that are hazardous because of the presence of easily ignitable fibers or flyings, but in which the fibers or flying are not likely to be in suspension in the air in quantities sufficient
to produce ignitable mixtures.
Class III, Division 1
Class I locations
These are locations in which easily ignitable fibers or materials
producing combustible flyings are handled, manufactured or used.
Class I locations are those in which flammable gases or vapors are or
may be present in the air in quantities sufficient to produce explosive
or ignitable mixtures.
Class III, Division 2
Class I, Division 1
These are Class I locations where the hazardous atmosphere is
expected to be present during normal operations. It may be present
continuously, intermittently, periodically or during normal repair or
maintenance operations. Division 1 locations are also those locations
where a breakdown in the operation of processing equipment results
in the release of hazardous vapors and the simultaneous failure of
electrical equipment.
50
These locations are where easily ignitable fibers are stored or
handled.
* All references to the National Electric Code are from the NFPA 70 1990
Edition.
Hazardous location equipment
Class I location equipment
Devices for Class I locations are housed in enclosures that are
designed to be strong enough to contain an explosion if the hazardous vapors enter the enclosure and are ignited. These enclosures
then cool and vent the products of combustion in such a way that the
surrounding atmosphere is not ignited.
Heat producing equipment for hazardous locations must also be
designed to operate with surface temperatures below the ignition
temperatures of the hazardous atmosphere.
Since the different vapors and gases making up hazardous atmospheres have varying properties, they have been placed in groups
based on common flame propagation characteristics and explosion
pressures. These groups are designated A, B, C and D, and the equipment selected must be suitable for the group of the specific hazardous gas or vapor, with regard to flame propagation, explosion pressures and operating temperatures.
Reference to the National Electrical Code will indicate that most of
the equipment used for Class I, Division 2 applications is the same as
that used for Division 1 applications.
Class II location equipment
The enclosures used to house devices in Class II locations are
designed to seal out dust. Contact between the hazardous atmosphere and the source of ignition has been eliminated and no explosion can occur within the enclosure.
As in Class I equipment, heat producing equipment must be
designed to operate below the ignition temperature of the hazardous
atmosphere. However, in Class II equipment, additional consideration
must be given to the heat buildup that may result from the layer of
dust that will settle on the equipment.
Dusts have also been placed in groups designated E, F and G,
based on their particular hazardous characteristics and the dusts’
electrical resistivity. It is important to select equipment suitable for
the specific hazardous group.
Hazardous location equipment applications
Hazardous location equipment may be required in any area where
the presence of flammable gases, vapors or finely pulverized dusts in
the atmosphere is sufficient to create a threat of explosion or fire. It
may also be required where easily ignitable fibers or flyings are present. The following is a representative (but hardly complete) list of the
types of locations and operations requiring hazardous location
equipment in at least certain areas.
Class I locations
•
•
•
•
•
•
•
•
Petroleum refining facilities
Dip tanks containing flammable or combustible liquids
Dry cleaning plants
Plants manufacturing organic coatings
Spray finishing areas (residue must be considered)
Petroleum dispensing areas
Solvent extraction plants
Plants manufacturing or using pyroxylin (nitrocellulose) type and
other plastics (Class II also)
• Locations where inhalation anesthetics are used
• Utility gas plants, operations involving storage and handling of
liquefied petroleum and natural gas
• Aircraft hangers and fuel servicing areas
Class II locations
•
•
•
•
•
•
•
Grain elevators and bulk handling facilities
Manufacture and storage of magnesium
Manufacture and storage of starch
Fireworks manufacture and storage
Flour and feed mills
Areas for packaging and handling of pulverized sugar and cocoa
Facilities for the manufacture of magnesium and aluminum
powder
• Some coal preparation plants and coal handling facilities
• Spice grinding plants
• Confectionery manufacturing plants
Class III location equipment
Class III locations
Class III locations require equipment that is designed to prevent the
entrance of fibers and flyings, prevent the escape of sparks or burning material and operate at a temperature below the point of combustion.
•
•
•
•
Wood working plants
Textile mills
Cotton gins and cotton seed mills
Flax producing plants
51
Chemicals by groups
Group A – atmospheres
• acetylene
Group B – atmospheres
•
•
•
•
•
•
acrolein (inhibited)
butadiene
ethylene oxide
formaldehyde (gas)
hydrogen
manufactured gases containing more
than 30% hydrogen (by volume)
• propyl nitrate
• propylene oxide
Group C – atmospheres
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
acetaldehyde
allyl alcohol
butyl mercaptan
n-butyraldehyde
carbon monoxide
crotonaldehyde
dicyclopentadiene
diethyl ether
diethylamine
di-isopropylamine
dimethylamine
di-n-propylamine
1, 4-dioxane
epichlorohydrin
ethyl mercaptan
n-ethyl morpholine
ethylene
ethylenimine
hydrogen cyanide
hydrogen selenide
hydrogen sulfide
isobutyraldehyde
isopropyl glycidyl ether
methyl ether
methyl formal
methyl mercaptan
methylacetylene
methylacetylene-propadiene (stabilized)
monomethyl hydrazine
morpholine
nitroethane
nitromethane
52
•
•
•
•
•
•
2-nitropropane
propionaldehyde
n-propyl ether
tetrahydrofuran
triethylamine
unsymmetrical dimethyl hydrazine
(UDMH 1, 1-dimethyl hydrazine)
• valeraldehyde
Group D – atmospheres
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
acetic acid (glacial)
acetone
acetonitrile
acrylonitrile
allyl chloride
ammonia
n-amyl acetate
sec-amyl acetate
benzene
butane
1-butanol (butyl alcohol)
2-butanol (secondary butyl alcohol)
n-butyl acetate
sec-butyl acetate
butylamine
butylene
chlorobenzene
chloroprene
cyclohexene
cyclopropane
1, 1-dichloroethane
1, 2-dichloroethylene
1, 3-dichloropropene
di-isobutylene
ethane
ethanol (ethyl alcohol)
ethyl acetate
ethyl acrylate (inhibited)
ethyl benzene
ethyl chloride
ethyl formate
ethylamine
ethylene dichloride
ethylene glycol monomethyl ether
ethylenediamine (anhydrous)
gasoline
heptane
heptene
hexane
2-hexanone
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
hexenes
isoamyl acetate
isoamyl alcohol
isobutyl acrylate
isoprene
isopropyl acetate
isopropyl ether
isopropylamine
liquefied petroleum gas
mesityl oxide
methane (nature gas)
methanol (methyl alcohol)
methyl acetate
methyl acrylate
methyl ethyl ketone
methyl formate
methyl isobutyl ketone
methyl isocyanate
methyl methacrylate
2-methyl-1-propanol (isobutyl alcohol)
2-methyl-2-propanol (tertiary butyl
alcohol)
methylamine
methylcyclohexane
naphtha (petroleum)
nonane
nonene
octane
octene
pentane
1-pentanol (amyl alcohol)
2-pentanone
1-pentene
petroleum naphtha
propane
1-propanol (propyl alcohol)
2-propanol (isopropyl alcohol)
n-propyl acetate
propylene
propylene dichloride
propylene oxide
pyridine
styrene
toluene
tripropylamine
turpentine
vinyl acetate
vinyl chloride
vinylidene chloride
xylenes
Group E – atmospheres
Atmospheres containing combustible metal dusts regardless of
resistivity, or other combustible dusts of similarly hazardous characteristics having resistivity of less than 105 Ωcm.
atmospheres containing these dusts sensitized by other materials so
that they present an explosion hazard, and having resistivity greater
than 102 Ωcm but equal to or less than 108 Ωcm.
Group G – atmospheres
Atmospheres containing combustible dusts having resistivity of
105 Ωcm or greater.
Group F – atmospheres
Atmospheres containing carbon black, charcoal, coal or coke dusts
that have more than 8% total volatile material (carbon black per
ASTM D1620; charcoal, coal and coke dusts per ASTM D271) or
Hazardous locations cross reference
Table 6
Maximum recommended wire length
IEC
Zone 0
Zone 1
North America
Intrinsically safe apparatus of category ia or other
apparatus, both specifically approved for Zone 0.
Some users recognize the Zone 0 principle without using the name
and would only install apparatus suitable for Zone 0 operation in
such areas.
All equipment certified for Zone.
Apparatus with type(s) of protection:
Apparatus with type(s) of protection:
•
•
•
•
•
•
•
•
•
•
•
“d” flameproof enclosure
“e” increased safety
“i” intrinsic safety (ia and ib)
“o” oil immersion
“p” pressurized apparatus
“q” powder filling
“s” special protection
Class I,
Division 1
Explosion-proof enclosures
Purging
Intrinsic safety
Oil immersion
In future:
• “m” moulding
All equipment certified for Zone 0 or 1.
Zone 2
Apparatus with type of protection:
• “n” non-sparking/non-incendive
Class I,
Division 2
All equipment certified for Division 1.
Apparatus incapable of creating sparks or hot surfaces capable of
ignition in “general purpose” enclosures, ANSI/ISA-S1212-1986.*
* Electrical equipment for use in Class I, Division 2 hazardous (classified) locations.
53
Industry reference information
What’s in a rating?
As a way of standardizing enclosure performance, organizations like
NEMA, UL, CSA, IEC and TUV Rheinland use rating systems to identify an enclosure’s ability to repel the outside environment. Resistance to everything from dripping liquid to hose-down to total submersion is defined by the ratings system.
While these ratings are all intended to provide information to help
you make a safer, more informed product choice, there are differences between them. NEMA, UL and CSA are the organizations most
commonly referred to in North America. Their ratings are based on
similar application descriptions and expected performance. UL and
CSA both require enclosure testing by qualified evaluators in their
labs. They also send site inspectors to make sure a manufacturer
adheres to prescribed manufacturing methods and material specifications. NEMA, on the other hand, does not require independent
testing and leaves compliance completely up to the manufacturer.
In Europe, TUV-IEC ratings are based on test methods that are similar to UL and CSA. Nevertheless, there are differences in how enclosure performance is interpreted. For example, UL and CSA test
requirements specify that even a single drop of water entering an
enclosure is considered a test failure. In the IEC standards for each
protection level (IP), a certain amount of water is allowed to enter the
enclosure.
North American enclosure rating systems also include a 4X rating
that indicates resistance to corrosion. This rating is based on the
enclosure’s ability to withstand prolonged exposure to salt water
spray.
While a 4X rating is a good indicator that an enclosure can resist
corrosion, it does not provide information on how a specific corrosive
agent will affect a given enclosure material.
Comparison of specific non-hazardous applications
Outdoor locations
Table 7
Comparison of specific non-hazardous applications (outdoor loctions)
Provides a degree of protection against the
following environmental conditions:
Type of enclosure
4
4X
Provides a degree of protection against the
following environmental conditions:
Type of enclosure
4
4X
Incidental contact with the enclosed equipment
Rain, snow and sleet*
Sleet
Windblown dust
•
•
•
Hose-down
Corrosive agents
Occasional temporary submersion
Occasional prolonged submersion
•
•
•
•
•
•
* External operating mechanisms are not required to be operable when the enclosure is ice covered.
Indoor locations
Table 8
Comparison of specific non-hazardous applications (indoor loctions)
Provides a degree of protection against the
following environmental conditions:
Type of enclosure
4
4X 12 13
Provides a degree of protection against the
following environmental conditions:
Incidental contact with the enclosed equipment
Falling dirt
Falling liquids and light splashing
Dust, lint, fibers and flyings*
Hose-down and splashing water
•
•
•
•
•
Oil and coolant seepage
Oil or coolant spraying and splashing
Corrosive agents
Occasional temporary submersion
Occasional prolonged submersion
•
•
•
•
•
•
•
•
•
•
•
•
•
Type of enclosure
4
4X 12 13
•
* These fibers and flyings are non-hazardous materials and are not considered Class III type ignitable fibers or combustible flyings. For Class III type ignitable fibers
or combustible flyings, see the National Electrical Code, Section 500-6(a).
54
• •
•
Enclosures for non-hazardous locations
Table 9
Enclosures for non-hazardous locations
NEMA National Electrical Manufacturers Association (NEMA Standard
250) and Electrical and Electronic Manufacturers Association of
Canada (EEMAC)
Type
designation
Canadian Standards Association
(Standard C22.2 Number 94)
1
General purpose enclosure; protects against accidental
contact with live parts.
Enclosures are intended for indoor use primarily to provide a degree of
protection against contact with the enclosed equipment or locations where
unusual service conditions do not exist.
2
Indoor use to provide a degree of protection against
dripping and light splashing of non-corrosive liquids and
falling dirt.
Enclosures are intended for indoor use primarily to provide a degree of
protection against limited amounts of falling water and dirt.
3
Indoor or outdoor use; provides a degree of protection
against rain, snow and windblown dust; undamaged by the
external formation of ice on the enclosure.
Enclosures are intended for outdoor use primarily to provide a degree of
protection against windblown dust, rain and sleet; undamaged by the
formation of ice on the enclosure.
3R
Indoor or outdoor use; provides a degree of protection
against rain and snow; undamaged by the external
formation of ice on the enclosure.
Enclosures are intended for outdoor use primarily to provide a degree of
protection against falling rain and sleet; undamaged by the formation of ice
on the enclosure.
4
Indoor or outdoor use; provides a degree of protection
against rain, snow, windblown dust, splashing and hosedirected water; undamaged by the external formation of ice
on the enclosure.
Enclosures are intended for indoor or outdoor use primarily to provide a
degree of protection against windblown dust and rain, splashing water and
hose-directed water; undamaged by the formation of ice on the enclosure.
4X
Indoor or outdoor use; provides a degree of protection
against rain, snow, windblown dust, splashing and hosedirected water; undamaged by the external formation of ice
on the enclosure; resists corrosion.
Enclosures are intended for indoor or outdoor use primarily to provide a
degree of protection against corrosion, windblown dust and rain, splashing
water and hose-directed water; undamaged by the formation of ice on the
enclosure.
6
Indoor or outdoor use; provides a degree of protection
against the entry of water during temporary submersion at
a limited depth; undamaged by the external formation of ice
on the enclosure; resists corrosion.
Enclosures are intended for use indoors or outdoors where occasional
submersion is encountered.
12
Indoor use; provides a degree of protection against
circulating dust, lint, fibers and flyings; dripping and light
splashing of non-corrosive liquids; not provided with
knockouts.
Enclosures are intended for indoor use primarily to provide a degree of
protection against dust, falling dirt and dripping
non-corrosive liquids.
13
Indoor use; provides a degree of protection against
circulating dust, lint, fibers and flyings; seepage and
spraying of non-corrosive liquids, including oils and
coolants.
Enclosures are intended for indoor use primarily to provide a degree of
protection against dust, spraying of water, oil and
non-corrosive coolant.
The preceding descriptions are not intended to be complete representations
of National Electrical Manufacturers Association standards for enclosures
nor those of the Electrical and Electronic Manufacturers Association of
Canada.
55
Enclosures for non-hazardous locations (continued)
Table 9 (continued)
Enclosures for non-hazardous locations
Type
designation
Underwriters Laboratories Inc. (UL 50 and UL 508)
1
Indoor use primarily to provide protection against contact with the enclosed equipment and against a limited amount of falling dirt.
2
Indoor use to provide a degree of protection against limited amounts of falling water and dirt.
3
Outdoor use to provide a degree of protection against windblown dust and windblown rain; undamaged by the formation of ice on the
enclosure.
3R
Outdoor use to provide a degree of protection against falling rain; undamaged by the formation of ice on the enclosure.
4
Either indoor or outdoor use to provide a degree of protection against falling rain, splashing water and hose-directed water; undamaged by
the formation of ice on the enclosure; resists corrosion.
4X
Either indoor or outdoor use to provide a degree of protection against falling rain, splashing water and hose-directed water; undamaged by
the formation of ice on the enclosure; resists corrosion.
6
Indoor or outdoor use to provide a degree of protection against entry of water during temporary submersion at a limited depth;
undamaged by the formation of ice on the enclosure.
12
Indoor use to provide a degree of protection against dust, dirt, fiber flyings, dripping water and external condensation of non-corrosive
liquids.
13
Indoor use to provide a degree of protection against lint, dust seepage, external condensation and spraying of water, oil and non-corrosive
liquids.
Underwriters Laboratories Inc. (UL) shall not be responsible to anyone for the use of or reliance upon a UL Standard by anyone. UL shall not
incur any obligation or liability of damages, including consequential damages, arising out of or connection with the use, interpretation of or
reliance upon a UL standard.
56
International standards’ IP
protection classification
IEC Publication 529, Classification of Degrees of Protection by Enclosures, provides a system for specifying required enclosures of electrical equipment. IEC 529 does not specify degrees of protection
against risk of explosion or conditions such as moisture (produced,
for example, by condensation), corrosive vapors, fungus or vermin.
NEMA Standards Publication 250 does test for environmental
conditions such as corrosion, rust, icing, oil and coolants. For this
reason, and because the tests and evaluations for other characteristics are not identical, the IEC enclosure classification designations
cannot be exactly equated with NEMA enclosure Type numbers.
Table 10 provides a cross-reference from NEMA enclosure Type
numbers to IEC enclosure classification designations. This cross-reference is an approximation based on the most current available
information of enclosure test performance and is not sanctioned by
NEMA, IEC or any affiliated agency.
To use the table, first find the appropriate NEMA rating along the
vertical axis, and then read across the horizontal axis for the corresponding IP rating. Do not use this table to convert IEC classification
designations to NEMA Type numbers.
Table 10
NEMA, UL, CSA versus IEC enclosure type cross-reference
(approximate)
Type of
enclosure
IP23
4
4X
12
13
IP30
IP32
IP64
IP65
•
•
IP66
IP67
•
•
• indicates compliance
IEC 529 has no equivalents to NEMA enclosure types 7, 8, 9, 10 or 11.
Specification
Table 11 shows the IP designation, which is as follows:
• IPxy, where:
IP = Characteristic letters
x = First characteristic numeral (protection against solid objects)
y = Second characteristic numeral (protection against liquids)
For example, an enclosure with the designation of IP23 would specify that it is protected against the penetration of solid objects greater
than 12 mm (0.47 in.) and against spraying water.
57
Table 11
IP designation
First Numeral
First Numeral
IP
Tests
IP
Tests
0
No protection.
0
No protection.
1
Protected against solid objects over
50,0 mm (1.97 in.), e.g., accidental
touch by hands.
1
Protected against vertically falling drops of
water, e.g., condensation.
2
Protected against solid objects over
12,0 mm (0.47 in.), e.g., fingers.
2
Protected against direct sprays of water up to
15° from vertical.
3
Protected against solid objects over
2,5 mm (0.10 in.), e.g., tools and wires.
3
Protected against sprays up to 60° from
vertical.
4
Protected against solid objects over
1,0 mm (0.04 in.).
4
Protected against water sprayed from all
directions (limited ingress permitted).
5
Protected against dust (limited ingress, no
harmful deposit).
5
Protected against low pressure jets of water
from all directions (limited ingress permitted).
6
Totally protected against dust.
6
Protected against strong jets of water.
7
Protected against the effects of immersion
between 15 cm and 1 m (between 5.9 in. and
3.3. ft.).
8
Protected against long periods of immersion
under pressure.
58
Sources of standards
Underwriters Laboratories Inc.
333 Pfingsten Road
Northbrook, IL 60062
UL 50 Cabinets and Boxes
UL 508 Industrial Control Equipment
UL 870 Wireways, Auxiliary Gutters and
Associated Fittings
Electrical/Electronic
Manufacturers
Association of Canada
10 Carlson Court
Suite 500
Rexdale (Toronto), Ontario,
Canada M9W 6L2
Canadian Standards Association
National Electrical
Manufacturers Association
178 Rexdale Boulevard
Rexdale (Toronto), Ontario,
Canada M9W 1R3
2101 L Street Northwest
Washington, D.C. 20037
CSA Standard C22.2 Number 94 Industrial
control equipment for use in ordinary (nonhazardous) locations
NEMA Standards Publication Number 250
Enclosures for Electrical Equipment
(1 000 Volts Maximum)
International Electro-Technical
Commission
3 rue de Varembé
P. Box 131
CH-1211 Geneva 20
Switzerland
IEC 529 Classification of Degrees of
Protection Provided by Enclosures
NEMA Standards Publication Number ICS6
Enclosures for Industrial Controls and
Systems
American National
Standards Institute
1430 Broadway
New York, NY 10018
ANSI Z55.1-1967 Gray Finishes for
Industrial Apparatus and Equipment
National Fire Protection
Association
Batterymarch Park
Quincy, MA 02269
NFPA 70 National Electrical Code (1990)
59
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60
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Whether the application is linear or rotary
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SKF can work with you to optimize current
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61
62
63
Please contact:
SKF USA Inc.
Condition Monitoring Center – San Diego
5271 Viewridge Court • San Diego, California 92123 USA
Tel: +1 858-496-3400 • Fax: +1 858-496-3531
Web: www.skf.com/cm
® SKF is a registered trademarks of the SKF Group.
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National Electric Code is a registered trademark of National Fire Protection Association.
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UL is a registered trademark of Underwriters Laboratories Inc.
All other trademarks are the property of their respective owners.
© SKF Group 2013
The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless prior written
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US 5,870,699 · US 6,437,692 · US 7,103,511 · US 7,697,492
PUB CM/P1 12000/1 EN · November 2013
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