Bently Nevada 330525 Specifications
330525 Velomitor XA Piezo-velocity
Sensor
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The Velomitor XA (eXtended Application) Sensor is a
ruggedized version of Bently Nevada's 330500 Velomitor
Sensor. Its 316L stainless steel case and unique, weatherproof
connector and cable assembly permit mounting without a
housing. The Velomitor XA Sensor cable assembly is suitable
for use in moist environments, and the Velomitor XA Sensor
design meets the requirements of IP-65 and NEMA 4X dust
ratings when properly installed with a mating extension
cable.
If you are measuring a machine housing to determine
where to install transducers, consider what kinds of
data you need to obtain. Most common machine
malfunctions (imbalance, misalignment, and so forth)
originate at the rotor and cause a change in rotor
vibration. The location you select on the housing must
accurately conduct rotor vibration to the transducer.
Install the transducer carefully. If you don't, the
transducer may not accurately detect vibrations and
can transmit invalid data. Bently Nevada provides
engineering services to accurately measure machine
housings and to install transducers.
141633 Rev. M
330525 Velomitor XA Piezo-velocity Sensor
Datasheet 141633 Rev. M
Specifications
Parameters are specified from +20 to +30 °C
(+68 to +86 °F) and 100 Hz unless otherwise
indicated.
Operating the unit outside the
specified limits may result in false
readings or loss of machine
monitoring.
Sensitivity 3.94mV/mm/s (100 mV/in/s)
±5%.
Frequency
Response
Temperature
Sensitivity
Velocity
Range
Transverse
Sensitivity
Amplitude
Linearity
Mounted
Resonant
Frequency
Broadband
Noise Floor
(4.5 Hz to 2
kHz)
4.5 to 2,000 Hz (270 to 120,000
cpm) ±3.0 dB,
6.0 to 1,000 Hz (360 to 60,000
cpm) ±0.9 dB.
-14% to +7.5% typical over the
operating temperature range.
1270 mm/s (50 in/s) peak.
Less than 5% of sensitivity.
±2% to 152 mm/s (6 in/s) peak.
Greater than 12 kHz.
0.004 mm/s (160 min/s) rms,
nominal.
Broadband
Noise Floor
Grounding Case isolated
Maximum
cable length
Less than 0.004 mm/s (160
µin/s)
305 metres (1,000 feet) of
cable, BN part number
02173007 with no degradation
of signal.
Environmental Limits
Operating
Temperature
Range
Shock
Survivability
Relative
Humidity
Magnetic
Field
Susceptibility
Operating
Temperature
Range
Shock
Survivability
Relative
Humidity
Magnetic
Field
Susceptibility
-55 °C to +121 °C (-67°F to
+250°F)
5000 g peak, maximum
To 100% non-submerged; case
is hermetically-sealed.
<51 min/s/gauss (50 gauss, 5060 Hz)
-55 °C to +121 °C (-67°F to
+250°F)
5000 g peak, maximum
To 100% non-submerged; case
is hermetically-sealed.
<51 min/s/gauss (50 gauss, 5060 Hz)
Physical Description
Power
Requirements
Output Bias
Voltage
Dynamic
Output
Impedance
DC Voltage: -22 to -30 V
Bias Current: 2.5 to 6.0 mA
-12 ± 3.0 VDC, Over
Temperature Referenced to
Pin A
Less than 2400 Ω
DC
Weight 156 g (5.5 oz), typical
Diameter 28 mm (1.1 in)
Height 73.1 mm (2.88 in)
Case
Material
Connector 2-pin Mil-C-26482 hermetically-
2/10
316L stainless steel
sealed, 316L stainless steel shell.
330525 Velomitor XA Piezo-velocity Sensor
Datasheet 141633 Rev. M
Mounting
45 N-m (33 ft-lb) maximum
Torque
Polarity Pin A goes positive with respect
to pin B when the sensor case
motion is toward the connector.
Cable Bend
1.5-in minimum bend radius.
Radius
Operating the unit outside the
specified limits may result in false
readings or loss of machine
monitoring.
Before installing and using this product, read
the 330500, 330525, and 330530 Velomitor
Sensors User Guide (document 100076).
3/10
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