350900 HT Velocity and Acceleration
SensorDatasheet

Bently Nevada Machinery Condition Monitoring

168780 Rev. JDescription
The 350900 High Temperature Velocity and Acceleration
Sensor (HTVAS) provides a continuous acceleration andvelocity output, allowing the customer to protect theirmachine with an velocity signal while simultaneously
capturing the acceleration signal for machinery diagnostics.
Its design is primarily for use with the 3500/42M and3500/44M monitors. When attaching the HTVAS to a3500/42M or 3500/44M monitor you must use theacceleration and velocity signals from the transducer on a
separate channel pair (such as channels 1 and 3) or on
separate monitors.
The 350900 High Temperature Velocity and Acceleration
Sensor (HTVAS) separates the high-temperature sensing
element from the signal conditioning electronics, with the two
permanently connected via a hardline cable. This
arrangement allows you to mount the sensing head on
surfaces with temperatures as high as +482 °C (+900 °F),
while installing the signal conditioning electronics in a cooler
location. Eliminating connections between the sensing headand its associated signal conditioning electronics alsoeliminates a significant source of potential transducer
failures (connector problems). This achieves overall
transducer system performance comparable to other casemounted vibration transducers, but permits use atsignificantly higher temperatures.

350900 HTVAS FeatureslllVelocity and acceleration output
High temperature operation up to +482°C (+900 °F)
Electronics rated to +125°C (+257°F), survivable to+155°C (+311°F)

350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

Most common machine malfunctions(unbalance, misalignment, etc.)
occur on the rotor and originate as anincrease (or at least a change) inrotor vibration. For any individual
casing measurement to be effective
for overall machine protection, thesystem must continually transmit asignificant amount of rotor vibration
to the machine casing, or mounting
location of the transducer.
In addition, be careful to install theaccelerometer transducer on thebearing housing or machine casing.
Improper installation may decrease
the transducer amplitude andfrequency response and/or generate
false signals that do not represent
actual vibration. Refer to theappropriate instruction manuals andApplication Notes.
Upon request, Bently Nevada provides
engineering services that can identify
the appropriate machine housing
measurements and installation
assistance if needed.
Upon request, Bently Nevada can provide
engineering services to determine thesuitability of housing measurements for themachine in question and/or to provide
installation assistance.

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350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

Specifications
Specifications are between +20 °C and +30 °C(+68 °F to +86 °F) with machine casing
vibration at 100 Hz (6000 cpm) and with a 10 kΩload unless otherwise indicated.

SystemSensitivity overExtended
Temperatures

ElectricalPower Requirements
Input
Voltage-18 to -30 Vdc; -18 to –28 Vdc
for hazardous area approval
options.

QuiescentCurrent

6 mA nominal, no load.

Transverse
Sensitivity

Less than 5% of axial sensitivity.

Amplitude
Linearity± 1% to 4900 m/s2 (500 g) peakoverall acceleration.

MountedResonant
Frequency

Greater than 15 kHz.

Maximum
Cable
Length305 meters (1000 ft).

GroundingCase isolated.

Frequency
Response

Over a sensor temperature
range of –54 °C to +482 °C(-65 °F to +900 °F) and withthe electronics between –54°C to +125 °C (-65 °F to +257°F), the output remains
within ± 15% of 3.94
mV/mm/s (100 mV/in/s).

Output Bias
Voltage-10.0 ± 2.0 Vdc.

Velocity Range

1270 mm/s (50 in/s).

Broadband
Noise Floor (5Hz to 2 kHz)

0.05 mm/s rms (0.002 in/srms), max.

Acceleration Output
Sensitivity

Velocity Output
Sensitivity

Over a sensor temperature
range of –54 °C to +399 °C(-65 °F to +750 °F) and withthe electronics between –54°C to +125 °C (-65 °F to +257°F), the output remains
within ± 10% of 3.94
mV/mm/s (100 mV/in/s).

Frequency
Response

3.94 mV/mm/s (100mV/in/s) ±5%.
40 Hz to 1 kHz (2400 cpm to60 kcpm) ±5% with 305
metres (1000 ft) of cable.
25 Hz to 2 kHz (1500 cpm to120 kcpm) ±3 dB with 305
metres (1000 ft) of cable.

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1.02 mV/m/s2 (10 mV/g) ±5%.
25 Hz to 4 kHz (1500 cpm to240 kcpm) ± 5% with 305
metres (1000 ft) of cable.
10 Hz to 10 kHz (600 cpm to600 kcpm) ± 3 dB with 305
metres (1000 ft) of cable.

350900 HT Velocity and Acceleration Sensor
Datasheet

SystemSensitivity overExtendedTemperatures

168780 Rev. J

Over a sensor temperature
range of -54 °C to +399 °C(-65 °F to +750 °F) and withthe electronics between –54°C to +125 °C (-65 °F to+257°F), the output remains
within ± 10% of 1.02 mV/m/s2(10 mV/g).

PhysicalSensor

Over a sensor temperature
range of –54 °C to +482 °C(-65 °F to +900 °F) and withthe electronics between –54°C to +125 °C (-65 °F to +257°F), the output remains
within ± 15% of 1.02 mV/m/s2(10 mV/g).

Output Bias
Voltage-10.0 ± 2.0 Vdc.

Acceleration
Range

4900 m/s2 (500 g).

Broadband
Noise Floor (5Hz to 2 kHz)

147 mm/s2 (1.5 mg) rms,
max.

100% condensing, nonsubmerged. Case ishermetically sealed.

Relative
Humidity

Dimensions

See Graphs and Figures on
page 9.

Mounting

30.2 mm (1.188 in) square
mounting hole pattern, 7.2 mm(0.283 in) mounting holes (4holes).

Mounting
Surface32 microinch rms.

Material

Nickel alloy 600.

Integral Cable
Diameter

6.35 ± 1.27 mm (0.25 ± 0.05 in)Material

300 Series Stainless Mineral
Insulated Integral Cable withStainless Steel Overbraid.

Environmental Limits

Bend Radius

Minimum bend radius of 51
mm (2.0 in).

Operating and Storage Temperatures

Integral Electronics

Sensor-54°C to +482°C (-65°F to+900°F).

MineralInsulatedCable-54°C to +482°C (-65°F to+900°F).

Electronics-54°C to +125°C (-65°F to+257°F).

Soak Back
Temperature

The electronics will survive
temperature exposure of+155°C (+311°F) for four hours
without failure. Electricalperformance does not be
met during this period.

Shock
Survivability

19,620 m/s2 (2000 g) peak,maximum.

Dimensions

See Graphs and Figures onpage 9.

Mounting

Patch panel hub mount.

Material

300 series stainless steel.

Connector

MIL-DTL-83723/90 - 1006N with
gold-plated 300 series
stainless steel.

System0.545 kg + 0.10 kg/m cable
Weightlength (1.200 lb + 0.006 lb/in(without field
cable length), typical.
wiring)Mounting
Angle

4/12

Any orientation

350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. JCompliance and Certifications
Hazardous Area Approvals

FCC
This device complies with part 15 of theFCC Rules. Operation is subject to thefollowing two conditions:ll

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

This device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

CSA/NRTL/C
330450EMC
EMC Directive 2014/30/EU

Ex ia IIC T4:
AEx ia IIC T4:
Class I, Div 1, Groups A, B, C, D.
Class II, Div 1, Groups E, F, G;
Class III, Div 1
Install per drawing 168078
T4 @ Ta (-40°C to 100°C)
Enclosure Type 4X

RoHS

Ex nL IIC T4:
Ex ec IIC T4:
Class I, Zone 2Class II, Div 2, Groups A, B, C and D

RoHS Directive 2011/65/EU

Maritime

Install per drawing 168078
T4 @ Ta (-40°C to 100°C)
Enclosure Type 4X

DNV rules for classification – Ships
DNV rules for classification – High
speed and light craft

350900DNV offshore standards

Ex ia IIC T4
AEx ia IIC T4
Class I, Zone 0
Class I, Division 1, Groups A, B, C and D;Class II, Division 1, Groups E, F, and G;Class III, Division 1
When installed with an approved zener
barrier per BN drawing 167923.
T4 @ T4 = 100°C
Ex nL IIC Class 1, Zone 2
Ex ec IIC Class 1, Zone 2Class I, Division 2 (non-incendive),
Groups A, B, C, and D
when installed per BN drawing 168077.

330750,330752

Ex ia IICClass 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 IICClass I, Division 2, Groups A, B, C and D

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350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

ATEX/IECEx
330450, 350900, 330750, 330752
330450, 350900, 330750,330752

II 1 GEx ia IIC or IIB Ta, T4 492°C

II 3 GEx na IIC or IIB Ta, T4, T1492°C Gc
Ex ec IIC or IIB Ta T4, T1492°C Gc
Ta, T1, T4 492°C
Ta, T4, T1 492°C

Temperatur
e Class

Temperature Range

Equipment

T4-40°C to+100°C

Electrical
Housing

T1-40°C to+400°C

Sensor andCable

T1-40°C to+482°CSensor andCable(3509000)

Entity Parameters for Zone 0/1 and Zone 2Group

IIC
33045
0IIB
33075
03509
33075
00
2350900330752TypeS

Type33075
33045
00TypeType SSUi

30 V

28 V

28 V

28 V

29.2 VIi

200mA

120mA

120mA

153mA

279mA

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Pi

1.5 W

1.0 W

1.0 W

0.84
W

1.95W

Ci

7 ηF

1 ηF

1 ηF

37 ηF

37 ηF

Li30 μH

30 μH

30 μH

30 μH 30 μH

350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

Hazardous Area Conditions of SafeUsel

ATEX/IECExl

Zone 0/1:
Equipment must be connected to equipment,
which meets the above listed entityparameters.

l

The cables type A or B (in compliance with EN60079-25) must respect the cable parameterslisted with the entity parameters.

lSpecial Notes for 330450, 330750, 330752 and350900
lll

This equipment is intrinsically safe andcan be used in potentially explosiveatmospheres.
The intrinsically safe apparatus shall only
be connected to an associatedintrinsically safe apparatus. Theassociation shall comply with therequirements of EN 60079-25 standard.
Operating ambient temperature range:o -40°C Tamb +100°C (electronichousing)o -40°C Tamb +400°C (sensor andcable)o -40°C Tamb +482°C (sensor andcable) for model 350900

lZone 2 :The supply electrical parameters shall not
exceed the values mentioned in the tablesabove.
Special Notes for 330450, 330750, 330752 and350900
lll

The equipment is safe when connected
to an associated source, containing a
reliable material limiting current andvoltage meeting the entity parameters.
Operating ambient temperature -40°C to+100°C (Electronic Housing)Operating ambient temperature -40°C to+400°C (Sensor and Cable)

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Operating ambient temperature -40°C to+482°C (Sensor and Cable for 350900).
The mating part of the connector shallprovide IP54 ingress protection or better
according to requirements of IEC 600790 and IEC 60079-7 or IEC 60079-15.
Provisions shall be made for ensuringthat the rated voltage and current are
not exceeded while in service.
Shall be supplied from Class II limited
energy source according torequirements of C22.2 No 61010-1-12 andUL 61010-1 3rd Edition.
Transient protection shall be provided
that is set at a level not exceeding 140 %of the peak rated voltage value at thesupply terminals to the equipment.

350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

Ordering Information
For the detailed listing of country andproduct specific approvals, refer tothe Approvals Quick Reference Guide(108M1756) available fromBently.com.

High Temperature Velocity andAcceleration Sensor
350900-AAA
A: Integral Cable Length Option
023

23 inches (0.58 metres)026

26 inches (0.66 metres)027

27 inches (0.69 metres)044

44 inches (1.12 metres)

077

77 inches (1.96 metres)083

83 inches (2.11 metres)

158

158 inches (4.0 metres)

237

237 inches (6.0 metres)

315

315 inches (8.0 metres)

394

394 inches (10.0 metres)

HTVAS Field Interconnect Cable
350901-AAA
A: Cable Length
010

10 ft (3.05 metres)

040

40 ft (12.2 metres)

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350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

Graphs and Figures

1.
2.
3.
4.
5.

Stainless steel overbraided MI cable
0.283 diameter through (typical), 4 places
Length1-12 UNF-2A
MIL-DTL-83723/90 connector

Figure 1: 350900 Transducer Dimensional Drawing
Dimensions are in millimetres [inches]

9/12

350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

Figure 2: Typical Velocity Amplitude and Phase Response

10/12350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

Figure 3: Typical Acceleration Amplitude and Phase Response

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350900 HT Velocity and Acceleration Sensor
Datasheet

168780 Rev. J

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Phone: 1.775.782.3611 (US) or Bently.com/support
Bently.com

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