Bently Nevada 330750, 330752 Specifications
330750 and 330752 High Temperature
Velomitor System
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The 330750 and 330752 High Temperature Velomitor System
sensor head and integral cable are designed for high
temperature environments. This enables you to mount the
sensing head on surfaces with temperatures as high +400°C
(+752°F).
To accomplish this, the transducer design segregates the
sensing element from the signal conditioning electronics. The
two are permanently connected using an integrated cable.
The integrated cable eliminates connectors which are a
significant source of transducer failures.
The cable enables you to position the signal conditioning
electronics in a cooler location. The internal electronics
withstands temperatures of 55°C to +121°C (−67°F to +250°F).
The integrated design makes it possible to capture
machinery performance data comparable to other Bently
Nevada Velomitor transducers, but at significantly higher
temperatures.
141639 Rev. R
For lower temperature environments, use the standard
330500 Velomitor Piezo-velocity Sensor. You can install it in
locations with a maximum operating temperature of +121°C
(+250°F).
330750 and 330752 High TemperatureVelomitor System
Datasheet 141639 Rev. R
Measuring Housings for Transducer
Placement
If you are measuring a machine housing to
determine where to place transducers,
consider which kinds of measurements you
want to obtain. Most common machine
malfunctions like imbalance or misalignment
originate at the rotor and cause a change—
usually an increase—in rotor vibration.
To obtain the best quality data, you need to
place the transducer on the bearing housing or
machine casing where machine vibration is
best transmitted through the housing. Choose
a location that maximizes amplitude and
frequency response and avoids detecting
signals that don’t represent actual machine
vibration. Improper installation can degrade
the transducer’s performance or produce
signals that don’t represent actual machine
vibration.
Bently Nevada provides engineering services to
determine the optimum location to place
transducers. We also can install transducers if
needed. For assistance, contact your local
customer care representative or Bently Nevada
at Bently.com.
Earlier versions of the 330750 and 330752
High Temperature Velomitor System
were limited to environments with a
maximum temperature of +300°C
(+572°F). The serial number of current
versions are preceded by the letter "G".
2/15
330750 and 330752 High Temperature Velomitor System
Datasheet 141639 Rev. R
Cable Length no degradation of signal.
Specifications
Environmental Limits
Parameters are specified from +20 to +30°C
(+68 to +86°F) and 100 Hz unless otherwise
indicated.
Operating the Velomitor transducer
outside the specified limits may result in
false readings, failure of the transducer
or loss of machine monitoring.
Electrical
Sensitivity 5.7 mV/mm/s (145 mV/in/s)
±5%
Frequency
Response
Transient
Temperature
Sensitivity
Amplitude
Range
Transverse
Sensitivity
Amplitude
Linearity
Mounted
Resonant
Frequency
15 to 2000 Hz (900 to 120,000
cpm) ± 3.0 dB;
20 to 1000 Hz (1,200 to 60,000
cpm) ± 0.9 dB
0.0762 mm/s/°C (0.003
in/s/°C), typical, as defined
in ISO 5347-18:1993(E)
635 mm/s (25 in/s) peak
below 680 Hz.
2940 m/s2 (300 g) peak
above 680 Hz.
Vibration at frequencies
above 2 kHz decreases this
range.
Less than 5% of Sensitivity
±2% to 152 mm/s (6 in/s)
peak
Greater than 5 kHz
Operating and Storage Temperature Range
Sensing Head Maximum mounted surface
temperature −55°C to
+
400°C (−67°F to +752°F)
Integral
Hardline Cable
Electronics
Shock
Survivability
Relative
Humidity
−55°
to +400°C (−67° to
+
752°F)
−55°
to +121°C (−67° to +250°F)
24,535 m/s2 (2500 g) peak
To 100% non-submerged;
case is hermetically sealed.
Physical
Weight (typical)
2 meters 635 grams (1.40 lb)
4 meters 794 grams (1.75 lb)
6 meters 953 grams (2.10 lb)
8 meters 1,111 grams (2.45 lb)
Mounting
Case 300 series stainless steel
See 330750 System
Dimensional Drawing on
page10.
See 330752 System
Dimensional Drawing on
page11.
Output Bias
Voltage
Broadband
Noise Floor
(15Hz to 2kHz)
Grounding Case Isolated
Maximum 305 meters (1000 feet) with
-12 ±2.0 VDC
0.127 mm/s (0.005 in/s) rms
nominal
Connector 2-pin Mil-C-5015 receptacle,
hermetically-sealed, 304
stainless steel shell.
Polarity When the applied velocity is
from the base to the top of
the transducer, Pin A
becomes positive with
3/15
330750 and 330752 High Temperature Velomitor System
Datasheet 141639 Rev. R
respect to Pin B.
Bend Radius Minimum bend radius of
51mm (2.0in)
Before installing this product, we
recommend you read the 330750 and
330752 High Temperature Velomitor
System User Guide (document 135090)
4/15
330750 and 330752 High Temperature Velomitor System
Datasheet 141639 Rev. R
Compliance and Certifications
FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
l This device may not cause harmful
interference.
l This device must accept any
interference received, including
interference that may cause
undesired operation.
EMC
EMC Directive 2014/30/EU
RoHS
RoHS Directive 2011/65/EU
Maritime
Hazardous Area Approvals
For the detailed listing of country and
product specific approvals, refer to the
Approvals Quick Reference Guide
(108M1756) available from Bently.com.
CSA/NRTL/C
Ex ia IIC
Class I, Zone 0, AEx ia IIC
Class I, Division 1, Groups A, B, C and D
Class II, Division 1, Groups E, F and G
Class III, Division 1
Ex nL IIC
Ex ec IIC
Class I, Division 2, Groups A, B, C and D
ATEX/IECEx
II 1 G
Ex ia IIC or IIB Ta, T4 492°C
330400and 330425 only
ABS 2009 Steel Vessels Rules
1-1-4/7.7,4-8-3/1.11.1,4-9-7/13
II 3 G
Ex na IIC or IIB Ta, T4, T1 492°C Gc
Ex ec IIC or IIB Ta T4, T1 492°C Gc
Ta, T1, T4 492°C
Ta, T4, T1 492°C
Temperature
Class
T4 -40°C to
T1 -40°C to
T1 -40°C to
Entity Parameters for Zone 0/1 and Zone 2
Group IIC IIB
Type
33045 33075 33075
Temperature
Range
+100°C
+400°C
+482°C
Equipment
Electrical
Housing
Sensor and
Cable
Sensor and
Cable
(3509000
35090 35090
5/15
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