bently nevada mms
TRANSCRIPT
PROXIMITYTRANSDUCERSYSTEM OPERATION
CopyrightBently Nevada CorporationAll Rights Reserved, 1996
The following marks are Bently Nevada Corporation’s Registered Trade Names:
MicroPROX ADRE REBAMKeyphasor Proximitor SeismoprobeKey Velomitor TorXimitorTrendmaster Smart Monitor Data ManagerDynamic Data Manager Transient Data Manager Bently Nevada
OUTERSCREEN
CENTERCONDUCTOR
INNERSCREEN
INSULATION
TRIAXIAL CABLE
PROBE NUMBERING
CABLE FIXEDLOCK NUT
TIPASSEMBLY
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 CABLEAND PROBE
PROXIMITOR
DEMODULATOR
OSCILLATORBENTLY
NEVADA
CONDUCTIVE MATERIAL
EDDY CURRENTS
RF SIGNAL
BENTLY
NEVADA
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
GAPCHANGE
ONEREVOLUTION
TIME
VOLTAGE CHANGE
PROBE OVER SURFACE
PROBE OVERNOTCH
KEYPHASOR WITH NOTCH TARGET
BENTLY
NEVADA
VOLTAGE CHANGE
PROJECTION
TIME
ONEREVOLUTION
PROBE OVERPROJECTION
PROBE OVERSURFACE
KEYPHASOR WITH PROJECTION TARGET
GAPCHANGE
BE
NT
LY
NE
VA
DA
CH
AN
GE
IN
VO
LT
AG
E
CHANGE IN GAP
24O
UT
PU
T I
N V
OL
TS
- D
C
PROBE GAP
mils 00
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
OU
TP
UT
IN
VO
LT
S -
DC
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 140mils
COMPONENT MISMATCH EFFECTS
PROBE GAP
OU
TP
UT
IN
VO
LT
S -
DC
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 140mils
TARGET MATERIAL EFFECTSO
UT
PU
T I
N V
OL
TS
- 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 140mils
CROSSTALK
SIDEVIEW
TARGET SIZE
YES
NO
PROXIMITOR CALIBRATION EQUIPMENT SET-UP
PROXIMITOR CALIBRATION EQUIPMENT SET-UP
DC VOLTMETER
-VTINPUT
PROXIMITOREXTENSION CABLE
SPINDLE MICROMETER
TARGET
PROBE
BENTLY
NEVADA
out
comvt
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 .
ProbeExtension cableProximitor
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
RF80 mils
eddy currents
material
positive
0Hz(dc) 10KHzac 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 measurementVibration measurementKeyphasor
203mV/mil Yes, 1.5% error
Incorrect supply voltage
Mismatched components
Incorrect target material
APPLICATION EXERCISE