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This video demonstrates one of the methods used to verify the integrity of a coax cable and probe. It can also be used as a quick method for verifying the extension cable length. This video is in reference to a vibration monitoring system, but can be used for any instrument using a coaxial extension cable.
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Proximity Probes, Sensors & Transducer Systems
Bently Nevada’s industrial pressure sensors work w/ machinery from hydro turbine & centrifugal pumps to reciprocating compressor cylinders.
Source: www.bakerhughes.com
Date Published: 1/18/2021
View: 8872
An All-New Version of the ProxPac* Probe Housing Assembly
professional specializing in Bently Nevada* Asset … 1 API 670 requires that oscillator/demodulator (i.e. Proximitor) modules.
Source: dam.bakerhughesds.com
Date Published: 6/4/2021
View: 3846
Proximity Transducer System Operation | What is a Proximitor ?
Generate a radio frequency (RF) signal using an oscillator circuit. … Vibration Proximitor Demodulator Circuit … Source : Bently Nevada …
Source: instrumentationtools.com
Date Published: 2/4/2021
View: 383
Eddy Current Sensor Probe – Control.com
As a power loss developed in the RF signal, the output signal at the Oscillator / Demodulator( Proximotor in Bently Nevada) is reduced …
Source: control.com
Date Published: 5/28/2022
View: 7561
SETPOINT digital proximity transducer system
and legacy Metrix™ and Bently Nevada™ proximity transducer systems? The SETPOINT digital proximity transducer … A coil of wire, an oscillator/demodulator,.
Source: www.nealsystems.com
Date Published: 7/5/2021
View: 4300
Overview of the 3500 Monitoring System of Bently Nevada
Generates a radio frequency (RF) signal using an oscillator. circuit. 2. Conditions the RF signal to extract usable data using a demodulator circuit.
Source: moinkhan.tripod.com
Date Published: 6/28/2021
View: 1814
Vibration measurement, proximity probes.
The oscillator generates a Radio Frequency (RF) signal. Demodulator conditions the Radio Frequency (RF) signal to extract usable data.
Source: instrumentationapplication.com
Date Published: 12/10/2021
View: 4401
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주제에 대한 기사 평가 oscillator demodulator bently nevada
- Author: Jim Diggins
- Views: 조회수 22,895회
- Likes: 좋아요 387개
- Date Published: 2020. 11. 2.
- Video Url link: https://www.youtube.com/watch?v=7haOL7NuhHE
Proximity Probes, Sensors & Transducer Systems
3300 5mm Proximity Probe. Sensor and Transducer System
The 3300 5mm Proximity Transducer System offers a smaller probe diameter while interfacing with XL 8mm extension cable and 5mm proximity sensor. The system provides an output voltage that is directly proportional to the distance between the probe tip and the observed conductive surface. The system can measure both static (position) and dynamic (vibration) data. Its primary use is in vibration and position measurement applications on fluid-film bearing machines, as well as Keyphasor measurement and speed measurement applications
The 3300 5mm Proximity Transducer System includes:
3300 5mm probe
3300 XL 5mm extension cable
3300 XL 5mm proximity sensor
3300 XL 8mm Proximity Probe, Sensor and Transducer System
The 3300 XL 8 mm system delivers the most advanced performance in our eddy current proximity transducer systems. The standard 3300 XL 8mm 5-meter system also fully complies with the American Petroleum Institute’s (API) 670 Standard (4th Edition) for mechanical configuration, linear range, accuracy, and temperature stability. All 3300 XL 8mm proximity transducer systems provide this level of performance and support complete interchangeability of probes, extension cables, and Proximitor† sensors, eliminating the need to match or bench calibrate individual components.
The 3300 XL 8mm Proximity Transducer System includes:
3300 XL 8mm proximity probe
3300 XL 8mm extension cable
3300 XL 8mm proximity sensor
3300 XL 11mm Proximity Probe, Sensor and Transducer System
Our 3300 XL 11 mm Proximity Transducer System is our standard eddy current proximity measurement system. It accommodates a variety of applications with a linear measurement range of 4 mm (160 mil) and provides a 3.94 V/mm (100 mV/mil) output to measure vibration and displacement. The 11 mm tip gives this Transducer System a longer linear range when the standard 8 mm lacks sufficient reach. With both European and North American approvals, the 330 XL 11mm allows for installation in Hazardous Areas.
Bently Nevada’s 3300 11mm Proximity Transducer System consists of:
Proximity Transducer System Operation
Proximity Transducer System provides an output voltage directly proportional to the distance between the probe tip and the observed conductive surface.
It is capable of both static (position) and dynamic (vibration) measurements, and is primarily used for vibration and position measurement applications on fluid-film bearing machines, as well as Keyphasor and speed measurement applications.
Proximity Transducer System
Proximity Transducer Systems provide an electrical signal that represents the distance between a conductive surface and the probe tip of the system.
The Proximitor contains electronics that provide two functions:
Generate a radio frequency (RF) signal using an oscillator circuit. Condition the RF signal to extract usable data using a demodulator circuit.
When conductive material is present in the RF field, Eddy Currents flow in the surface of that material.
The penetration depth of the eddy currents depends on the material’s conductivity and permeability. 4140 steel penetration is around 0.003 inches (3 mils).
Once the probe is close enough to cause eddy currents to flow in a conductive material the RF signal is affected in two ways:
1. Amplitude is at a MINIMUM when distance (Gap) between probe and target material (Target) is at a MINIMUM. Maximum eddy current flow occurs.
2. Amplitude is at a MAXIMUM when distance (Gap) between probe and target material is at a MAXIMUM. Minimum eddy current flow occurs.
If the target is moving SLOWLY within the RF field, the signal amplitude INCREASES or DECREASES SLOWLY.
If the target is moving RAPIDLY within the RF field, the signal amplitude INCREASES or DECREASES RAPIDLY.
Oscillatory movement of the target causes the RF signal to modulate.
The demodulator circuit deals with slowly or rapidly changing signal amplitude in the same way. If the target is not oscillating, as might be the case with a thrust probe, the Proximitor output is a constant DC voltage, called the gap.
If the target is oscillating (gap changing slowly or rapidly) the Proximitors output is a varying DC voltage (AC) shown above by a sine wave. If the probe is observing a vibration, the Proximitor will provide both a DC (gap) and an AC (vibration) component in the output signal.
A typical system frequency response is from 0 Hz (DC) to 10 kHz. Newer transducer systems, such as the 3300XL proximity system have responses up to 12 kHz.
Verification of Proximity Probes
Probe response is verified by measuring and creating a calibration curve.
Problems that can cause proximity probes to be out of tolerance:
probe cable length
power supply voltage
crosstalk and sideview conditions
target size and material
Proximity Probe Used as a Keyphasor
Proximity Probes Installation
Source : Bently Nevada
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Vibration measurement, proximity probes.
Vibration systems use transducers which convert mechanical motions into electrical signals.
What is Vibration?
Rapidly changing too and fro motion either in vertical or horizontal of an object with reference to a centerline is called vibration.
Vibration is a mechanical phenomenon. A vibration monitoring system is used to monitor the health of a machine in real-time and helps when the machine would need maintenance.
Types of Transducers:
Proximity Transducer System.
Velocity Transducers System.
Accelerometer transducers System.
Velometer Transducers System.
The proximity transducer system consists of three parts
1. Probe – which is basically installed on the machine.
2. Extension cable – which connects the probe and the proximitor.
3. Proximitor – It is the part that contains the electronics.
Proximitor performs two functions: Proximity transducer system converts the mechanical vibration to an electrical signal proportional to the displacement of vibration.
Proximitor consists of two circuits
1. Oscillator
2. Demodulator
The oscillator generates a Radio Frequency (RF) signal.
Demodulator conditions the Radio Frequency (RF) signal to extract usable data.
To do this, it needs a -17.5 V to -26VDC (with barrier) supply connected between terminals VT and COM. Once the proximitor is powered it will generate an RF signal at a specific frequency.
The frequency is depending on the inductance (L) value of the probe’s coil and capacitance (C) value of the extension cable plus probe cable. RF frequency will be having a range from 500 kHz to 2 MHz
RF signal creates its field around the probe’s tip. When the conductive material is present in the vicinity of the RF field, eddy currents flow on the surface of that materials.
When the conductive material is away from the RF field, eddy currents will be less inside the conductor, RF signal loss will be less.
When the conductive material is nearer from the RF field, eddy currents will be more inside the conductor, RF signal loss will be more.
Measurement of parameters and concepts:
The proximity transducer system has many uses in monitoring the behavior of the machine shaft. There are three main types of dynamic motion. Radial vibration, Axial movement. One more use is Keyphasor or once per revolution marker.
Axial vibration:
Defined as a change in position of the rotor in an axial direction relative to a fixed point.
Radial vibration:
Defined as the motion of the shaft centerline within the radial bearing.
Key Phasor:
The probe is mounted on a shaft which is having a notch or projection on it. It will see once per each revolution as the shaft rotates and counts the revolutions. Key phasor in turbomachines is necessary to find out the phase angle of unbalance mass at the time of dynamic balancing.
Units of measurement:
Mil
Micrometer (mm).
The relation between mil and mm:
1 mil = 1/1000 inch = 0.0254 millimeter.
1 micrometer = 1/1000 mm
1 mil = 25.4 micrometer.
The figure-A below shows the demodulator output when a conductive material is away from the probe. It means the amplitude is maximum when the distance (gap) between probe and material (Target) is at maximum. Minimum eddy current flow occurs.
The figure-B below shows the demodulator output when a conductive material is nearer to the probe. Amplitude is less when the distance (gap) between probe and material (Target) is at a minimum. A maximum eddy current flow occurs.
Extension Cable:
It is the cable that connects the probe and the proximitor and when combine with the probe length gives the total electrical length.
Proximitor length = Probe length + extension cable length.
How to check proximity cable health status:
Total resistance = R Probe + R Core + R Jacket.
R Probe – Resistance from center conductor to the outer conductor. Resistance changes as with the increase of cable length. It is 7.45 Ω for 0.5-meter length proximity cable.
R Core – Resistance from center conductor to the center conductor. Resistance increases as with the increase of cable length.
For 3-meter extension cable (0.066 Ω).
R Jacket – Resistance from outer conductor to the outer conductor.
It is 0.20 Ω for a 3-meter cable.
As per the above data, the total resistance of the proximity system is = R Probe + R Core + R Jacket
= 7.45 Ω + 0.066 Ω + 0.20 Ω
=7.73Ω
It varies as per the proximity probe length. Proximity probe lengths are available in 0.5 meter, 1 meter, 1.5 meters, 2 meters, and 5 meters.
Scale factor:
It is expressed in the ratio of change in gap voltage to the change in probe distance from the target, generally it is a rotor shaft of the machine.
The scale factor for proximity sensors is set at 200 mV/mill or 7.87 mV/micron (mV is peak to peak).
For example: As per the table below,
The Voltage at 40 mills (1.01 mm) is -7.49 V
The voltage at 50 mills (1.27 mm) is -9.48 V
Gap is 50 mill – 40 mills = 10 mills
Scale factor = Change in voltage/ Change in gap
= (-9.58) – (-7.46)/10 = 200 mV/mill
The linear range is 2mm (80 mils). The linear range begins at approximately at 10 mils to 90 mils (-1 to -17 VDC).
114478128 Bently Nevada Mms
114478128 Bently Nevada Mms
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Content
PROXIMITY
TRANSDUCER
SYSTEM OPERATION
Copyright
Bently Nevada Corporation
All Rights Reserved, 1996
The following marks are Bently Nevada Corporation’s Registered Trade Names:
MicroPROX ADRE REBAM
Keyphasor Proximitor Seismoprobe
Key Velomitor TorXimitor
Trendmaster Smart Monitor Data Manager
Dynamic Data Manager Transient Data Manager Bently Nevada
OUTER
SCREEN
CENTER
CONDUCTOR
INNER
SCREEN
INSULATION
TRIAXIAL CABLE
PROBE NUMBERING
CABLE
FIXED
LOCK NUT
TIP
ASSEMBLY
P/N 330106-05-30-10-02-00
S/N APRS 416567
EXTENSION CABLE NUMBERING
HEAT SHRINK SLEEVING
CONNECTOR
P/N 330130-080-00-00
PROXIMITOR
SIGNAL OUTPUT
SIGNAL COMMON
TRANSDUCER POWER
ELECTRICAL LENGTH
PROXIMITOR OPERATION
<100mil RF SIGNAL EXTENSION CABLE AND PROBE PROXIMITOR DEMODULATOR OSCILLATOR B E N T L Y N E V A D A CONDUCTIVE MATERIAL EDDY CURRENTS RF SIGNAL B E N T L Y N E V A D A EDDY CURRENT FLOW R RF SIGNAL SMALL GAP 0 LARGE GAP RF SIGNAL 0 RF SIGNAL CHANGING GAP 0 DEMODULATOR OPERATION DEMODULATOR INPUT PROXIMITOR OUTPUT 0 0 RADIAL MOVEMENT AXIAL MOVEMENT RADIAL AND AXIAL MOVEMENT NOTCH GAP CHANGE ONE REVOLUTION TIME VOLTAGE CHANGE PROBE OVER SURFACE PROBE OVER NOTCH KEYPHASOR WITH NOTCH TARGET VOLTAGE CHANGE PROJECTION TIME ONE REVOLUTION PROBE OVER PROJECTION PROBE OVER SURFACE KEYPHASOR WITH PROJECTION TARGET GAP CHANGE B E N T L Y N E V A D A C H A N G E I N V O L T A G E CHANGE IN GAP 24 O U T P U T I N V O L T S - D C PROBE GAP mils 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 2 4 6 8 10 12 14 16 18 20 22 PROXIMITOR CALIBRATION GRAPH Average Scale Factor (ASF) equals: change in gap voltage change in gap (-18.0Vdc) - (-2.0Vdc) 0.08in or 2.0 mm = 200 mV/mil or = 7.87 mV/um -24V SUPPLY POWER SUPPLY VOLTAGE EFFECTS PROBE GAP -16V SUPPLY O U T P U T I N V O L T S - D C 24 22 20 18 16 14 12 10 8 6 4 2 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 mils COMPONENT MISMATCH EFFECTS PROBE GAP O U T P U T I N V O L T S - D C SHORT CORRECT LONG 24 22 20 18 16 14 12 10 8 6 4 2 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 mils TARGET MATERIAL EFFECTS O U T P U T I N V O L T S - D C PROBE GAP 4140 STEEL TUNGSTEN ALUMINUM COPPER 24 22 20 18 16 14 12 10 8 6 4 2 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 mils CROSSTALK SIDEVIEW TARGET SIZE YES NO PROXIMITOR CALIBRATION EQUIPMENT SET-UP PROXIMITOR CALIBRATION EQUIPMENT SET-UP DC VOLTMETER -VT INPUT PROXIMITOR EXTENSION CABLE SPINDLE MICROMETER TARGET PROBE B E N T L Y N E V A D A o u t c o m v t Q1. The three parts of a proximity transducer system are: a. b. c. Q2. The ruggedised coaxial cable used in the system has a center conductor and . Q3. What is the electrical length of the following probe? 330106-05-30-05-02-00 . Q4. What is the electrical length of the following extension cable? 330130-045-00-00 . Q5. What is the total electrical length required by the following Proximitor? 330100-50-00 . Probe Extension cable Proximitor two screens 0.5M 4.5M 5.0M APPLICATION EXERCISE Q6. The Proximitor must be supplied with a dc voltage between ____________ and . Q7. An field is created around the probe. It extends away from the face of the probe for linear range of at least . Q8. When a conductive material is within range of the probe _____________ flow in the surface of that material. Q9. A Proximitor must be calibrated to suit the it has as a target. Q10. The dc output from the Proximitor will go more as the target moves closer to the probe. Q11. A proximity system frequency response is from to and its output may contain an and a component. -17.5 Vdc -26.0 Vdc RF 80 mils eddy currents material positive 0Hz(dc) 10KHz ac dc APPLICATION EXERCISE Q12. Name three applications for a proximity transducer system. a. b. c. _____________________ Q13. Calculate the scale factor (sf) from the following: 90mils = 18.5Vdc, 10mils = 2.25Vdc. Is it within tolerance? Q14. Name three reasons why a proximity system could be out of tolerance. a. b. c. Thrust measurement Vibration measurement Keyphasor 203mV/mil Yes, 1.5% error Incorrect supply voltage Mismatched components Incorrect target material APPLICATION EXERCISE
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