Radiation Resistant Proximity System
Datasheet

Bently Nevada Machinery Condition Monitoring141595 Rev. N

Description
The Bently Nevada Radiation Resistant Proximity Transducer
System enables you to monitor pumps, motors, and otherrotating machinery operating in gamma-radiation
environments.
The Radiation Resistant Proximity Transducer System consists
of:
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A 0.300 or 0.420 radiation resistant probe
A radiation-resistant extension cable
An XL Radiation Resistant Proximitor Sensor

The Radiation Resistant Proximity Transducer System
maintains its signal integrity better than standard Bently
Nevada systems when exposed to gamma-radiation
environments. The systems are available with probe
diameters of 0.300 and 0.420 inches, each with different
linear ranges. The 0.300 system is available in 15-, 40-, and110-foot lengths, and the 0.420 system is available in a 15-footlength only. The longer 40- and 110-foot systems allow you toremotely locate the Proximitor Sensor, minimizing theProximitor Sensor’s exposure to radiation and extending its
operational life.
The 330280 Proximitor Sensor is backward compatible andinterchangeable with the 36363 0.300 Proximitor Sensor, andthe 330281 Proximitor Sensor is backward compatible andinterchangeable with the 23268 0.420 Proximitor Sensor.
The Radiation Resistant Proximity Transducer System iscompatible with 3300 and 3500 Series Monitoring Systems
that have been modified to use the previous 36363 or 23268
Radiation Resistant Systems. Please contact your local Bently
Nevada sales professional for information on specific monitor
modifications.

Radiation Resistant Proximity System
Datasheet

141595 Rev. N

Proximitor Sensor
The XL Proximitor Sensor physical packaging
permits high-density DIN-rail installation. It canalso be mounted in a traditional panel mountconfiguration, where it shares an identical“footprint” to older 4-hole mounted Proximitor
Sensor designs. Both mounting base options
provide electrical isolation and eliminate theneed for separate isolator plates. Improved
RFI/EMI immunity allows the XL Proximitor
Sensor to achieve European CE mark approvals
without requiring special shielded conduit or
metallic housings, resulting in lower installation
costs and complexity.
The XL’s SpringLoc terminal strips require no
special installation tools and facilitate faster,
more robust field wiring connections byeliminating screw-type clamping mechanismsthat can loosen over time.

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Specifications
Unless otherwise noted, these specifications
describe a Proximitor Sensor, extension cable,and probe under these conditions:llField wiring

At +22°C (+72°F).
Using a -24 Vdc power supply, a 10 kΩ
load, and an AISI E4140 steel target

Unless noted, these specifications apply before
irradiation.

Linear Range

ElectricalElectricalAccepts one non-contacting
Radiation Resistant Proximity
Probe and Extension Cable

Power

Requires -17.5 Vdc to -26 Vdc
without barriers at 18 mA
maximum consumption.
Operation at a more positive
voltage than -23.5 Vdc canresult in reduced linear range

OutputResistance50 Ω

0.300 Probedc resistance(nominal)(Rprobe)1.6 Ω + 0.426 Ω/m (0.130 Ω/ft)

0.420 Probedc resistance(nominal)(Rprobe)2.5 Ω + 0.410 Ω/m (0.125 Ω/ft)

Linear range begins at –4.5
Vdc, approximately 0.5 mm
0.300 inch, 15(20 mils) from target and isfoot systemfrom 0.5 to 1.75 mm (20 to 70mils).

0.36 Ω/m (0.11 Ω/ft)

Shieldconductor(Rjacket)

0.023 Ω/m (0.007 Ω/ft

Extension
cable
capacitance(nominal)

63 pF/m (19.2 pF/ft)

0.300 inch,
40-foot
systemLinear range begins at –4.5
Vdc, approximately 1 mm (40mils) from target and is from 1
to 2.25 mm (40 to 90 mils).

0.300 inch,
110-footsystemLinear range begins at –4.5
Vdc, approximately 1 mm (40mils) from target and is from 1
to 2.25 mm (40 to 90 mils).

Linear range begins at –5.0
Vdc, approximately 1.0 mm
0.420 inch, 15(40 mils) from target and isfoot systemfrom 1.0 to 3.3 mm (40 to 130mils).
Incremental Scale Factor (ISF)
3.94 mV/µm (100 mV/mil)±15% including
0.300 inch, 15- interchangeability error whenfoot systemmeasured in increments of
0.25 mm (10 mils) over the
1.25 mm (50 mil) linear range.

Extension Cable dc Resistance (nominal)
Centerconductor(Rcore)0.2 to 1.5 mm2 (16 to 24 AWG)
Recommend using 3
conductor shielded triaxial
cable field wiring. Maximum
length of 305 meters (1,000feet) between the XL
Proximitor Sensor and themonitor. See the frequency
response graph for signal roll
off at high frequencies whenusing longer field wiring
lengths.

0.300 inch,
40-foot
system

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3.94 mV/µm (100 mV/mil)±17% includinginterchangeability error whenmeasured in increments of
0.25 mm (10 mils) over the
1.25 mm (50 mil) linear range.

Radiation Resistant Proximity System
Datasheet

0.300 inch,
110-footsystem141595 Rev. N

3.94 mV/µm (100 mV/mil)±20% includinginterchangeability error whenmeasured in increments of
0.25 mm (10 mils) over the
1.25 mm (50 mil) linear range.

3.94 mV/µm (100 mV/mil)±15% including
0.420 inch, 15- interchangeability error whenfoot systemmeasured in increments of
0.25 mm (10 mils) over the
2.25 mm (90 mil) linear range.
Frequency Response
15-foot
systems

0 to 10 kHz: +0, -3dB, with up to
305 meters (1000 feet) of fieldwiring40-foot
system0 to 9 kHz: +0, -3dB, with up to
305 meters (1000 feet) of fieldwiring110-footsystem0 to 5 kHz: +0, -3dB, with up to
305 meters (1000 feet) of fieldwiringFiberglass reinforced epoxy
with anhydride curing

Probe Case
Material

300 series stainless steel

Probe andextension
cable
specifications

85 Ω coaxial, Tefzel insulated
cable

Proximitor
sensormaterial

A308 aluminum

Flexible stainless steel with
Tefzel outer jacket

Tensilestrength(maximumrated)

133 N (30.0 pounds) probe
case to probe lead andprobe lead to extension
cable connectors

Connector
material

Gold-plated brass

Probe casetorque33.9 Nm (300 in lb)

Total systemweight(typical)

1.0 kg (2.2 lb)

Thread Engagement Limits

Mechanical
Probe Tip
Material

Extension
cable armor(optional)

Probe
Case
ThreadMaximum Length of Thread
Engagement

3/8-240.563 in

M10x1

15 mm

Maximum thread engagement
lengths are per the industry standardof 1.5 times the nominal thread
diameter. A fit class matching that of
the external probe thread is assumed
for all internal threads. Applications
with thread engagement lengths
exceeding the values in the table
above may exhibit binding during
installation. Contact your Bently
Nevada representative if you require
probe thread engagement lengths
exceeding the values above. Bently
Nevada does not replace proximity
probes under warranty due toexcessive thread engagement
lengths.

Proximitor and198.4 g (0.44 lb)
housing weight
Proximitor
without
136.0 grams (0.30 lb)
housing weight

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Environmental Limits
Operating and Storage Temperature Range
Probe-29°C to +150°C (-20°F to+302°F)

Extension
cable-29°C to +150°C (-20°F to+302°F)

Proximitor
Sensor-51°C to +100°C (-60°F to +212°F)

Relative
humidityLess than a 3% change in
Average Scale Factor (ASF)
when tested in accordance with
IEC standard 68-2-66

Systemradiation
limit

6.0 Mrads (gamma maximum
integrated dose)

We recommend a maximum 6
Mrads exposure. See Summary
Radiation Testing Report
Table 1: Radiation Degradation Factor
After 6.0 Mrads Gamma
0.300 System

15-Foot
SystemAverage scale
factor change -5.7%
Voltagechange atlinear range
end-0.4 V

40-Foot
System110-Foot
System-12.2%-17.0%-1 V-1.1 V

0.420 Proximitor

15-Foot
SystemAverage scale factor change-21.6%

Voltage change at linear
range end

-0.56 V

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Radiation Resistant Proximity System
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significant sample size to guarantee theproduct at these higher levels. Any observation
or extrapolation of this data is not a guaranteeof the product performance.

Summary Radiation Testing
Report9 Mrads

Bently Nevada completed a series of tests toensure that the product will meet the
specifications contained in this document. The
information below outlines the details
regarding the testing and irradiation. The
customer can use this information to validate
how the product is used and infer how the
product could change with gamma-radiation
exposures.

These are limitations and boundary conditions.

l

The Device Under Test (DUT) will have thelargest parameter shift when the unit ispowered up and being irradiated at thesame time.
The gamma-radiation was from a Co60
source. Many 16-inch-long rods wereplaced in a circular pattern around the
DUT to establish uniform radiation andexposure levels around the DUT. The
length of the rods ensured that the top
and bottom of the DUT were also being
irradiated, albeit at a slightly lower level.
The dosage rate is the sum effect of all of
the rays intersecting at the DUT.

The product was not designed or tested:
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Voltage change @ linear
range end

-7.61%-0.57 Vdc

ASF = Average Scale Factor

Important items about the testingl

ASF Change

To be a part of the control loop as the
product design is for monitoring
purposes only,
For LOCA (loss of coolant accident),
sometimes called LOC (loss of coolant),
events,To withstand neutron radiation, or
For spike or burst events.

Observation
We tested a representative sampling of theunits and none of the tested units failed.
However, the numbers of units tested at thehigher radiation levels did not constitute a

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Compliance and Certifications
FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to thefollowing two conditions:llThis device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

RoHS
RoHS Directive 2011/65/EU

EMC
EMC Directive 2014/30/EU

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Radiation Resistant Proximity System
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ExampleOrdering Information

06= 60 mm
Unthreaded length must be at least
20 mm less than the case length.
Order in increments of 10 mm.

For the detailed listing of country andproduct-specific approvals, refer tothe Approvals Quick Reference Guide(108M1756).

B: Overall Case Length Option

For additional technicaldocumentation, please log in to
bntechsupport.com and access the
Bently Nevada Media Library.

English Thread Configurations
Maximum case length: 9.6 in
Minimum case length: 0.8 in
ExampleRadiation Resistant Probes
36448 0.300 inch, 3/8-24 UNF thread, 5/16inch wrench flats, without armor

24 = 2.4 in
Order in increments of 0.4 in
Metric Thread Configurations
Maximum case length: 250 mm
Minimum case length: 20 mm

27482 0.300 inch, 3/8-24 UNF thread, 5/16-inch
wrench flats, with armor

06= 60 mm

36447 0.300 inch, M10 x 1, 8 mm wrench flats,
without armor

Example36446 0.300 inch, M10 x 1, 8 mm wrench flats,with armor

C: Total Electrical length Option

Part Number-AA-BB-CC

18

18 inches (0.46 meter)

36

36 inches (0.91 meter)

For 36448 and 27482 Probes only

A: Unthreaded Length Option

ExampleOrder in increments of 10 mm

English Thread Configurations

72

72 inches (1.82 meters)

Maximum unthreaded length: 8.8
inMinimum unthreaded length: 0.0
in

Reverse Mount Radiation Resistant
Probes04 = 0.4 in

27485 -AA 0.300 inch, 3/8-24 UNF threads
19056 - AA 0.420 inch, 3/8-24 UNF threads

Unthreaded length must be at least
0.8 inches less than the case length.
Order in increments of 0.1 in.

A: Total Electrical Length Option

Metric Thread Configurations
Maximum unthreaded length:
230 mmMinimumunthreaded length: 0.0
mm

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18

18 inches (0.46 meter) (Option for
27485 ONLY)

36

36 inches (0.91 meter)

Radiation Resistant Proximity System
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141595 Rev. N

0.300 inch Radiation Resistant
Extension Cable

0.300 inch Radiation Resistant
Proximitor Sensor

27490 - AAAA-BB

330280 - AAA-BB

A: Cable Length Option

0.420 inch Radiation Resistant
Proximitor Sensor

0090

9.0 feet (2.74 meters)

0120

12.0 feet (3.66 meters)

0135

13.5 feet (4.12 meters)

0340

34.0 feet (10.36 meters)

0370

37.0 feet (11.28 meters)

0385

38.5 feet (11.73 meters)

1040

104.0 feet (31.70 meters)

1070

107.0 feet (32.60 meters)

1085

108.5 feet (33.08 meters)

330281 - AAA-BB
A: System Length Option

Without armor

01

With armor

15 feet (4.6 meters)

040

40 feet (12.2 meters)

110

110 feet (33.5 meters)
040 and 110 are options for the330280 only

B: Mounting Option

B: Armor Option
00

015

00

Panel mount hardware

01

DIN mount hardware

Accessories

0.420 inch Radiation Resistant
Extension Cable

Tefzel bulk field wire.

127502 - AA

02173100

A: Armor Option
00

Without armor

01

With armor
Length = 12.0 feet (3.66 meters) only.

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1.0 mm2 (18 AWG), 3-conductor,
twisted cable, drain wire, andaluminum shield. Specify length
in feet.

138492-01

Replacement panel-mount
mounting pad138493-01

Replacement DIN-mount
mounting pad

Radiation Resistant Proximity System
Datasheet

141595 Rev. N

XL Test Plug.

148722-01

The XL Test Plug contains threesmall test pins attached to threecolor-coded wires 1 meter inlength, each terminated in abanana plug. The 3-pin adapter
plugs into the test pinholes on
XL-style Proximitor Sensors. It is
used to check the performanceof the Proximitor Sensor from thetest pin holes in the terminal
strip without requiring theremoval of the field wiring.

04310310

XL Proximitor Sensor Panelmount Screws. Package
includes four 6-32 UNC thread
forming mounting screw.

04301007

3/8-24 Probe Lock Nut withsafety wire holes Single probe
lock nut with two holes drilled
through the nut in order tosecure the lock nut in place withsafety wire.

04301008

M10 x 1 Probe Lock Nut withsafety wire holes. Single probe
lock nut with two holes drilled
through the nut to secure thelock nut in place with safety
wire.

00510400

Male extension cable connector
for probes and extension cables.

00510401

Female extension cableconnector.
Connector Crimp Tool Kit.

163356

BentlyManuals

Includes connector installation
instructions, and carrying case.
Customer DVD containing all
Bently Manuals, FWD, App Notes,
and Install Guides in all
available languages.

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Datasheet

141595 Rev. N

Graphs and Figures
Note: All dimensions shown in millimetres [inches] except as noted

Figure 1: Typical Radiation Resistant 0.300" 15-ft System over ambient Temperature Range

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Figure 2: Typical Radiation Resistant 0.300" 15-ft Probe Only @ Th

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Figure 3: Typical Radiation Resistant 0.300" 15-ft Probe Only @ Tc

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Figure 4: Frequency Response, typical Radiation Resistant 0.300" 15-ft System with varying
lengths of field wiring attached, no barriers

Figure 5: Phase Response, typical Radiation Resistant 0.300" 15-ft System with varying lengths offield wiring attached, no barriers

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Figure 6: Typical Radiation Resistant 0.300" 40-ft System over ambient Temperature Range

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Figure 7: Typical Radiation Resistant 0.300" 40-ft Probe Only @ Th

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Figure 8: Typical Radiation Resistant 0.300" 40-ft Probe Only @ Tc

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Figure 9: Frequency Response, typical Radiation Resistant 0.300" 40-ft System with varying
lengths of field wiring attached, no barriers

Figure 10: Phase Response, typical Radiation Resistant 0.300" 40-ft System with varying lengthsof field wiring attached, no barriers

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Radiation Resistant Proximity System
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Figure 11: Typical Radiation Resistant 0.300" 110-ft System over ambient Temperature Range

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Figure 12: Typical Radiation Resistant 0.300" 110-ft Probe Only @ Th

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Radiation Resistant Proximity System
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Figure 13: Typical Radiation Resistant 0.300" 110-ft Probe Only @ Tc

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Figure 14: Frequency Response, typical Radiation Resistant 0.300" 110-ft System with varying
lengths of field wiring attached, no barriers

Figure 15: Phase Response, typical Radiation Resistant 0.300" 110-ft System with varying lengthsof field wiring attached, no barriers

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Figure 16: Typical Radiation Resistant 0.420" 15-ft System over ambient Temperature Range

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Figure 17: Typical Radiation Resistant 0.420" 15-ft Probe Only @ Th

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Figure 18: Typical Radiation Resistant 0.420" 15-ft Probe Only @ Tc

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Figure 19: Frequency Response, typical Radiation Resistant 0.420" 15-ft System with varying
lengths of field wiring attached, no barriers

Figure 20: Phase Response, typical Radiation Resistant 0.420" 15-ft System with varying lengthsof field wiring attached, no barriers

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1.
2.
3.
4.
5.
6.

Unthreaded Length "AA"
Case Length "BB"
Total Length "CC", ±7%
Coaxial Tefzel cable, 4.3 (0.17) Outside Diameter Maximum
8 (5/16) Wrench Flats, 4 each
Miniature Male Coaxial Connector, 7.23 (0.285) Outside
Diameter Maximum
7. 14.3 (9/16) Hex for 3/8-24 thread type, 17.0 (0.67) Hex forM10 thread type
8. Case, 300 Series SST, 3/8-24 UNF-2A or M10 thread

Figure 21: Radiation-resistant Proximity Probe, Standard Mount

36448, 3/8-24 UNF-2A threads 36447, M10x1 threads

1.
2.
3.
4.
5.
6.

Unthreaded Length "AA"
Case Length "BB"
Total Length "CC", ±7%
Tefzel Coated Armor, 9.6 (0.377) Diameter
Case, 300 Series SST, 3/8-24 UNF-2A or M10 thread
14.3 (9/16) Hex for 3/8-24 thread type, 17.0 (0.67) Hex forM10 thread type
7. Miniature Male Coaxial Connector, 7.23 (0.285) Outside
Diameter Maximum

Figure 22: 0.300" Radiation-resistant Proximity Probe, Standard Mount Armored

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27482, 3/8-24 UNF-2A threads 36446, M10x1 threads

1.
2.
3.
4.

11.1 (7/16) Hex
Case, 300 Series SST, 3/8-24 UNF-2A
Coaxial Tefzel Cable, 4.3 (0.17) Outside Diameter Maximum
Miniature Male Coaxial Connector, 7.23 (0.285) Outside
Diameter Maximum
5. Total Length "C", ±7%

Figure 23: 27485, 0.300" Radiation-resistant Proximity Probe, Reverse Mount

3/8-24 UNF-2A threads

1.
2.
3.
4.

7/16 Hex
Case, 300 Series SST, 3/8-24 UNF-2A
Coaxial Tefzel Cable, 4.3 (0.17) Outside Diameter Maximum
Miniature Male Coaxial Connector, 7.23 (0.285) Outside
Diameter Maximum
5. Total length "C", +25%, -10%

Figure 24: 19056, 0.420" Radiation-resistant Proximity Probe, Reverse Mount

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3/8-24 UNF-2A threads

1. Miniature Male Coaxial Connector, 7.2 (0.285) Max.
Diameter
2. Coaxial Tefzel Cable, 4.3 (0.17) Outside Diameter Maximum
3. Tefzel Coated Armor, 9.6 (0.377) Diameter
4. Miniature Female Coaxial Connector 7.2 (0.285) Max.
Diameter
5. 305 ± 152 (12.0 ± 6), 2 places
6. 27490 .300 cable, Total Length “A”, ±7%
7. 127502, .420 cable, Total Length = 12 feet (3.66 metres)+20%/-10%
Figure 25: Radiation-resistant Extension Cable

27490, 0.300 extension cable; 127502, 0.420 extension cable

1. Mounting Option “B” = “00”2. 4.0 (0.158) diameter mounting thru holes, qty
Figure 26: 330280 and 330281, Panel Mount Radiation-resistant XL Proximitor Sensor

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Figure 27: 330280 and 330281, DIN Rail Mount Radiation-resistant XL Proximitor Sensor

Figure 28: Physical mounting characteristics showing interchangeability of the 3000 and XL
Radiation Resistant Proximitor Sensors when 4-hole mounting
Notes:
1. All dimensions on figures are in millimeters (inches) unless otherwise noted.
2. Standard mount 0.300 probes supplied with 17 mm or 9/16-inch lock nut.
3. Reverse mount probes are not available with armor.
4. Letters inside quotation marks on figures refer to probe ordering options.
5. Stainless steel armor is supplied with Tefzel outer jacket.
6. Coaxial cable contains Tefzel dielectric and outer jacket.

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Copyright 2024 Baker Hughes Company. All rights reserved.

Bently Nevada, M2, Proximitor and Orbit Logo are registered trademarks of Bently Nevada, a Baker Hughes business,in the United States and other countries. The Baker Hughes logo is a trademark of Baker Hughes Company. All otherproduct and company names are trademarks of their respective holders. Use of the trademarks does not imply any
affiliation with or endorsement by the respective holders.
Baker Hughes provides this information on an “as is” basis for general information purposes. Baker Hughes does notmake any representation as to the accuracy or completeness of the information and makes no warranties of any
kind, specific, implied or oral, to the fullest extent permissible by law, including those of merchantability and fitness
for a particular purpose or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect,
consequential or special damages, claims for lost profits, or third party claims arising from the use of theinformation, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to makechanges in specifications and features shown herein, or discontinue the product described at any time without
notice or obligation. Contact your Baker Hughes representative for the most current information.
The information contained in this document is the property of Baker Hughes and its affiliates; and is subject tochange without prior notice. It is being supplied as a service to our customers and may not be altered or its content
repackaged without the express written consent of Baker Hughes. This product or associated products may becovered by one or more patents. See Bently.com/legal.

1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 (US) or Bently.com/support
Bently.com

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