3701/46 ADAPT Hydro Monitor
Datasheet

Bently Nevada Machinery Condition Monitoring

103M9138 Rev. J

Advanced Distributed Architecture
Platform Technology - ADAPTThe Bently Nevada Advanced Distributed Architecture
Platform Technology, or ADAPT 3701, is a family of compact,high performance safety and machinery protection andcondition monitoring solutions. ADAPT products are targetedat specific assets and applications, and excel at the intensive
signal processing necessary to identify early indicators ofmachine failure modes long before an alarm.

Description
The ADAPT 3701/46 Hydro Monitor is designed specifically forprotection and condition monitoring on Hydro Turbines. It is
optimized for the lower speeds of hydro turbines and has
specialized measurements to detect rough load zone,
propeller, blade, or bucket nX frequencies and cavitation as
well as conventional measurements of shaft radial positionand vibration, thrust position, and absolute vibration using
accelerometers or velocity sensors.
The compact size and channel count of the 3701/46 Hydro
Monitor make it well suited for hydro turbines requiring no
more than 12 sensor points. Hydro turbines in this category
can range in size and type but are most commonly smaller
units.
The 3701/46 is configured and validated with Bently Nevada
Monitor Configuration (BNMC) software. BNMC is a simple andpowerful configuration and validation environment that islicensed per computer. One license can configure an
unlimited number of Bently Nevada 3701 monitoring systems.
It is ordered separately and is required for operation.

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

3701/46 Overview
The 3701/46 is a robust, compact, selfcontained 12-channel device withsophisticated signal processing capability andwith a form-factor suitable for distribution close
to individual hydro machines. It has a modular
construction that allows field changing ofcomponents and is fully-configurable. It
combines protection and condition monitoring(CM) in a single package. With the ability todefine measurements and alarms within themonitor itself, it can act as a stand-alone
protection and CM system. There is no need forany interaction with external software to trigger
or control the monitor during operation.

Part

Quantity Required in each3701/46

3701 Terminal
Base13701 Processor
Module13701 Input
Module1 or 23701 Output
Module1 or none

3701 Digital Communications

3701 Digital Communications

The 3701/46 has two independent Ethernet
physical RJ45 connections per CPU for digitalcommunication with Bently Nevada software
products hosted on network computers andplant automation systems. It uses a
proprietary Ethernet protocol forcommunicating with System_1_Evolution
software and the BNMC configuration software.

The 3701/46 has two independent Ethernet
physical RJ45 connections per CPU for digitalcommunication with Bently Nevada software
products hosted on network computers andplant automation systems. It uses a
proprietary Ethernet protocol forcommunicating with System_1_Evolution
software and the BNMC configuration software.

The 3701/46 includes two independently
addressable Ethernet ports which provide
Ethernet TCP/IP communications capabilities.
Standard industrial protocols are:

The 3701/46 includes two independently
addressable Ethernet ports which provide
Ethernet TCP/IP communications capabilities.
Standard industrial protocols are:
The 3701/46 is a robust, compact, selfcontained 12-channel device withsophisticated signal processing capability andwith a form-factor suitable for distribution close
to individual hydro machines. It has a modular
construction that allows field changing ofcomponents and is fully-configurable. It
combines protection and condition monitoring(CM) in a single package. With the ability todefine measurements and alarms within themonitor itself, it can act as a stand-alone
protection and CM system. There is no need forany interaction with external software to trigger
or control the monitor during operation.

llModbus TCP/IP
Ethernet Global Data (EGD)
Modbus over Ethernet is available forconnection to HMI’s, unit control
systems, or other plant automationequipment. The 3701 can only be
configured as a server.
EGD is a GE protocol used on Mark VI
and Mark Vie controllers and by GE
Programmable Automation
Controllers and certain 3rd party
automation equipment.

The 3701/46 Hydro Monitor is a self-contained
device that is ordered with a single part number
and is made up of these major components:

2/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

3701/46 System Description

and fault detection processing to enhancereliability, availability, and maintainability of theprotection and monitoring system.

The 3701/46 monitor is powered by single ordual redundant external +24 V DC power. It
consists of four main physical components: theterminal base (single or dual), one or two
processor modules, one or two input modules,
and an output module.

Input Modules

The terminal base is the mounting platform forthe monitor. The different modules install into
the terminal base and two pluggable fieldwiring termination blocks plug into the terminalbase. Sensor wiring terminates on the wiring
blocks and terminations for discrete inputs(Reset, Trip Multiply, etc.) terminate directly on
the base but on the opposite side from sensor
wiring.

3701 Proximitor Accelerometer Velomitor(PAV) Input Module
The 3701 PAV input module is a 6-channel +Keyphasor/speed input module that interfaces
to a variety of sensors such as: -24 Volt
Proximitor sensors, -24 Volt 3-wire
Accelerometers, Velomitors, and constantcurrent 2-wire sensors that are compatible withthe -24 Volt 2-wire Velomitor interface.

The processor module is the monitor’s CPU. It isthe center of the logic and signal processing forthe monitor.
The input modules are the interface to thesensors. Each input module type covers
multiple sensor varieties but due to the numberof sensor types there are different input
modules. The input modules condition theanalog sensor signals for delivery to A/Dconversion on the processor module. The input
modules are simple, reliable, analog circuitry
but with a simple microcontroller (outside theprotection path) to provide diagnostics andfault detection on each module. Bufferedtransducer outputs are provided at a multi-pin
D-sub connector on each input module. An
accessory cable is available to fan the bufferedouts to BNC or ADRE 408 DSPi compatible
connectors.

Any of the PAV’s six channels (1 – 6) can be
independently configured for one of the
supported transducers. Each PAV supports one
dedicated Keyphasor or speed measurement
on channel 7 that is configurable for Proximitor
sensors or magnetic pick-ups.

3701 Proximitor Accelerometer Seismic(PAS) Input Module
The 3701 PAS input module is a 6-channel +Keyphasor/speed input module that interfaces
to a variety of sensors such as: -24 Volt
Proximitor sensors, -24 Volt 3-wire
Accelerometers, 2-wire Seismoprobes andcompatible 3rd party inertial mass velocity
sensors, or dynamic pressure sensors.

The output modules provides 8 programmable
SPDT relays and a dedicated monitor
Protection Fault (OK) Relay. Relay logic iscreated in the BNMC software using thegraphical logic editor.

Any of the PAS’s six channels ( 1 – 6) can be
independently configured for one of the
supported transducers. Each PAS supports one
dedicated Keyphasor or speed measurement
on channel 7 that is configurable for Proximitor
sensors or magnetic pick-ups.

Processor Module
The processor module, or CPU module,
performs A/D conversion, digital signal
processing, alarm and logic processing, andcommunications to Bently Nevada softwareand plant automation systems. The CPU
module employs sophisticated diagnostics

3701 Positive (PoV) Input Module
The 3701 PoV input module is a 6-channel +Keyphasor/speed input module that interfaces

3/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

to a variety of positively powered sensors such
as: +24 V Proximitor sensors, +24 V Interface
modules, and 2 wire IEPE sensors using 3.3 mAconstant current.

The 3701 simplex terminal base is the mounting
and installation component of the monitor. It
supports a single processor module, one or two
input modules, and an output module.

Any of the PoV's six channels (1-6) can be
independently configured for one of the
supported transducers. Each PoV supports
one dedicated negatively powered Keyphasor
or speed measurement on channel 7 that isconfigurable for Proximitor sensors or magnetic
pick-ups.

The terminal base mounts to a bulkhead, or
enclosure or wall sub-panel using the four
mounting holes at the corners of the base.
Mount vertically for optimal convection cooling.

Output Modules
3701 8-Channel Relay Output Module
The 3701 8-Ch Relay Output Module provides 8
SPDT relay outputs or 4 "virtual" DPDT outputs
and a dedicated Protection Fault relay. Relay
logic is user programmable in the BNMC
software using the graphical logic editor. The
processor module operates on the relay logic
to drive relay state.

Terminal base features:l

The Protection Fault relay is a normallyenergized SPDT relay that will de-energize on
fault conditions that can compromise themonitor’s availability to protect machinery. The
protection fault relay is similar to a traditional
OK relay but certain conditions that do notcompromise protection will not cause theProtection Fault relay to de-energize.

ll

The relays are configured for Normally DeEnergized (NDE) or Normally Energized (NE) infour banks of two relays each using a switch on
the relay module.

lRelay wiring terminates on the output moduleusing pluggable connectors and exits on the
opposite side of the monitor from the sensor
inputs.

l

Terminal Base
3701 Simplex Terminal Base
The term “simplex terminal base” identifies, or
distinguishes this type of terminal base as one
with a single (simplex) processor module as
opposed to a dual (or duplex) terminal basewith two processor modules.

4/24

Two plugable terminal blocks provide
sensor wiring terminations that are
individually marked for the sensor wire
type. The termination blocks can beremoved for wiring ease or maintenancework and, when installed, are fixed inplace with a locking mechanism.
A dedicated connection terminal forsingle point connection to system earth.
A single point earth connection switch toseparate physical (chassis) earth fromsystem common (instrument earth) toenable system common connection toan external intrinsic safety earth.
Primary and secondary connectors for
single or redundant +24 V DC power
input.
Six discrete inputs (DI) for dedicated dry
contact DIs: Trip Multiply, Alarm/Relay
Inhibit, Latch Reset, Special Alarm Inhibit,
Run Mode, and IP/Account reset.

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Channel Types, Sensors, andMeasurements
The 3701/46 Hydro Monitor supports a set ofstandard channel types and the common
sensors used with those channel types as wellas custom configurable sensors. Support for
sensor types is dependent on input module
type as listed in tables located below in thisdatasheet section. Each channel type has
default measurements that can be enabled or
disabled and each channel type can have user
customizable nX and bandpass
measurements added to the channel and thencustomized to the application.
The 3701/46 can have up to 12 vibration input
channels (Six per input module) and 2
Keyphasor/Speed inputs (One per input
module). The monitor supports the channel
types listed here:
l
l
l
l
l
l

Acceleration
Dynamic Pressure
Radial Vibration
Thrust Position
Velocity
Keyphasor/Speed

5/243701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Input Module

sensor. This cannot be done with the PoV
module.

Table 1: Channel Type Support by Input
ModuleInput
ModuleInput Module Compatibility

Channel Types

Table 2: Input Module Compatibility withAcceleration Inputs

Acceleration
PAS

Input
ModuleRadial Vibration

Channels Thrust Position
1-6
VelocityPAS
Channel
7155023-01 High Freq 200g Accel I/F
ModuleProximitor Speed

23733-03 Accel I/F Module

Keyphasor/Speed (Proximitors,
single and multi-event or Mag
pickup, single and multi-event).

24145-02 High-Freq Accel I/F
Module330400 100 mV/g Accelerometer

Acceleration
PAV

PAS

Dynamic Pressure

Radial Vibration
Channels
Thrust Position
1-6
Velocity

Channel
7

PoV49578-01 Accel I/F Module

Keyphasor/Speed (Proximitors,
single and multi-event or Mag
pickup, single and multi-event).

Custom

Acceleration

23733-03 Accel I/F Module

Dynamic Pressure24145-02 High-Freq Accel I/F
Module155023-01 High Freq 200g Accel I/F
Module

PAV

Velocity

Channel7330450 High Temp Accelerometer

350900 High Temp Velocity &Acceleration

Channels Radial Vibration
1-6
Thrust Position

PoV

330425 25 mV/g Accelerometer

350501 Acceleration Charge
AmplifierProximitor Speed
PAV

Accelerometer or Accelerometer
Interface Module

330400 100 mV/g Accelerometer
330425 25 mV/g Accelerometer
330450 High Temp Accelerometer

Keyphasor/Speed (Proximitors,
single and multi-event or Mag
pickup, single and multi-event).

350501 Acceleration Charge
Amplifier49578-01 Accel I/F Module

PAV and PAS channels 1–6 can also be
configured to support an additional Keyphasor
input provided it is a single event per revolution,less than 10,000 rpm, and uses a Proximitor

Custom
PoV

6/24

GSI 122, 124 and 127 Galvanic

3701/46 ADAPT Hydro Monitor
Datasheet

Input
Module103M9138 Rev. J

Accelerometer or Accelerometer
Interface Module
Interface Unit
TP100 Commtest Accelerometer
TP500 Commtest Accelerometer
200350 Accelerometer
Table 4: Input Module Compatibility with
Proximitor Sensors

200355 Accelerometer
786-500 Wilcoxon Accelerometer

Input Module

626B02 PCB Accelerometer
HS-170 Hansford AccelerometerPAS or PAV

3300XL 8 & 11 mm

HS-100F series Hansford
Accelerometer

PoV (Keyphasor)

3300XL NSV
3300 RAM Proximitor

CMSS-2100 SKF Accelerometer

3300 5 & 8 mm

351M35 PCB Accelerometer

3300 16mm HTPS

Table 3: Input Module Compatibility with
Velocity Inputs
Input
Module7200 5, 8, 11, 14 mm
Custom

Velomitors and Interface
Modules

Table 5: Input Module Compatibility with
Dynamic Pressure Inputs

9200 Seismoprobe

Input
Module74712 Hi Temp Seismoprobe
PAS

47633 Seismoprobe

PAS

86205 BoP Seismoprobe

PAV

3-Wire (Com/Sig/-24VDC)

330500 Velomitor

Constant current compatible with
Velomitor interface

330525 Velomitor XA

2-wire PCB 121A21

190501 Velomitor CT

PoV

330750 High Temp Velomitor

2-wire PCB 121A44
2-wire PCB 121A22

330752 High Temp Velomitor
330505 Low Freq Velocity Sensor
330530 Radiation Resistant
Velomitor
CustomPoV

Dynamic Pressure Sensor

3-Wire (Com/Sig/-24VDC)

Custom>PAV

Proximitor Sensor

HS-160 Hansford Velocity Sensor

7/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Table 6: Default Measurements by Channel
Type
Measurement

Measurement

Units (mils or µm peak-peak ordrms)(2)Configurable Attributes

Clamp value (amplitude andphase)

Radial Vibration
Full scale range

Gap

Units (mils or µm peak-peak or
rms)

Low Pass
CornerFrequency

High pass corner frequency
DirectLow pass corner frequency

Clamp Value(Volts)High pass filter order (1,2,4,6, or
8th )Accelerometer

Low pass filter order (1, 2, 4, 6,
or 8th)Full scale range
Units (English or metric, peakor rms)Clamp value (amplitude)
Full scale range

Rough Load
Zone

High pass corner frequency

Units (mils or µm peak-peak or
rms)

Low pass corner frequency
DirectLow pass filter order (1, 2, 4, 6,
or 8th) Clamp value(amplitude)

Clamp value (amplitude)

Full scale range

Integrated

Keyphasor association
Integer or non-integer

Full scale rangeorder in increments of 0.1x from
0.1x to 100x (phase not valid for
non-integer orders).

Units (English or metric, peakor rms)High pass corner frequency

Units (mils or µm peak-peak or
drms)

Cavitation

Clamp value (amplitude andphase)

2X

High pass filter order (1,2,4,6, or
8th )Low pass filter order (1, 2, 4, 6,
or 8th)Running Speed

1X(2)Configurable Attributes

Low pass corner frequency
High pass filter order (1,2,4,6, or
8th )Full scale range

Low pass filter order (1, 2, 4, 6,
or 8th)Keyphasor association

Clamp value (amplitude)

Integer or non-integer order inincrements of 0.1x from 0.1x to100x (phase not valid for noninteger orders).

8/24

3701/46 ADAPT Hydro Monitor
Datasheet

Measurement

1X

103M9138 Rev. J

Measurement(2)Configurable Attributes

Full scale range

Integrated

Keyphasor association

Full scale range

Integer or non-integer order inincrements of 0.1x from 0.1x to100x (phase not valid for noninteger orders).

Keyphasor association

Units (English or metric, peakor drms)

1X

Integrated

Clamp value (amplitude andphase)

Full scale range

Integrated

Keyphasor association

Full scale range

Integer or non-integer order inincrements of 0.1x from 0.1x to100x (phase not valid for noninteger orders).

Keyphasor association

Units (English or metric, peakor drms)

2X

Integrated

Clamp value (amplitude andphase)

Low Pass Corner Frequency

Integrated

Clamp Value (Volts)

Low Pass Corner
Bias

Velocity
Full scale range

Frequency Clamp Value(Volts)ThrustUnits (English or metric, peakor rms)Full scale range

High pass corner frequency
DirectInteger or non-integer order inincrements of 0.1x from 0.1x to100x (phase not valid for noninteger orders).
Units (English or metric, peakor drms)

Clamp value (amplitude andphase)

Bias

Integer or non-integer order inincrements of 0.1x from 0.1x to100x (phase not valid for noninteger orders).
Units (English or metric, peakor drms)

Clamp value (amplitude andphase)

2X(2)Configurable Attributes

Position

Low pass corner frequency
High pass filter order (1,2,4,6, or
8th )Units (mils or mm)
Low pass corner frequency
Clamp value (amplitude)

Low pass filter order (1, 2, 4, 6,
or 8th)Gap

Clamp value (amplitude)

Dynamic

9/24

Low Pass Corner Frequency
Clamp Value (Volts)

3701/46 ADAPT Hydro Monitor
Datasheet

Measurement

103M9138 Rev. J(2) In addition, user customizable nX vectors,(2)Configurable Attributes

amplitude extractions and bandpass
measurements may be added to each (nonspeed) channel.

Pressure
Full scale range

The number of measurements that can be
added and enabled depends on the signal
processing capability of the processor module.
There is no limitation, other than processor
performance, to the number of measurementsthat can be added to a single channel oracross all channels. A performance calculator
in the BNMC software provides feedback during
the configuration process on performance
margin as measurements are added or
removed and their attributes modified.

Units (psi or mbar peak-peak,
dpp or rms)
High pass corner frequency
Pressure

Low pass corner frequency
High pass filter order (1,2,4,6, or
8th )Low pass filter order (1, 2, 4, 6,
or 8th)Table 7: Additional Measurements by
Channel TypeClamp value (amplitude)
Full scale range

Measurement

Units (psi or mbar peak-peakor rms)Radial Velocity,
Thrust, Dynamic
Pressure,
Accelerometer,
VelocityHigh pass corner frequency
Bandpass

Low pass corner frequency
High pass filter order (1,2,4,6, or
8th )Full scale range
Units (English or metric,
peak to peak or rms)

Low pass filter order (1, 2, 4, 6,
or 8th)High pass corner frequency

Clamp value (amplitude)
Bias

Bandpass

Low Pass Corner Frequency
Clamp Value (Volts)

Gap

Top ScaleHigh pass filter order(1,2,4,6, or 8th )Clamp value (amplitude)

Clamp Value

Full scale range

Low Pass Filter Frequency

Keyphasor association

Clamp Value (Volts)
nX

Magnetic Pickup Speed
Speed

Low pass corner frequency

Low pass filter order (1, 2, 4,
6, or 8th)

Proximitor Speed
Speed(1)Configurable Attributes

Top Scale
Clamp Value

Integer or non-integer
order in increments of 0.1x
from 0.1x to 100x (phase notvalid for non-integer
orders).
Units (English or metric,

10/24

3701/46 ADAPT Hydro Monitor
Datasheet

Measurement

103M9138 Rev. J

Waveform configuration for spectral dataconsists of fmax and the number of lines in the
spectral data.

(1)Configurable Attributes

Asynchronous spectral waveforms:

peak to peak or drms)

Fmax can be set between 10 Hz and 40 kHz
in 12 discrete steps. Fmin is always at 0 Hz.

Clamp value (amplitude
and phase)

The number of spectral lines can be set
from 12.5 to 3200 in 12 discrete steps.

Full scale range
Units (English or metric,
peak to peak or rms)
Amplitude
Extraction

Clamp value (amplitude)
Associated Spectrum

Synchronous spectral waveforms:

Center Frequency

Number of samples per revolution can be
set from 8 to 4096.

Bandwidth

Number of revolutions per waveform canbe set from 1 to 1024.

Full scale range

Spectral Band

Units (English or metric,
peak to peak or rms)

Amplitude Extractions

Clamp value (amplitude)

An Amplitude extraction is the amplitude at auser configured center frequency and with auser configured bandwidth. The band aroundthe center frequency is limited in size and canrange from a single spectral line (bucket)
closest to the configured center frequency, tothe center spectral line plus 5 lines on each side
(11 total buckets).

Associated Spectrum
Start Frequency
Stop Frequency(1) Technically feasible configurations
depend on the interaction between
many factors. Certain selections may
not be feasible. Use the BNMC
software to create an off-line
configuration to determine technicalfeasibility.

Alarming and Setpoints
Alert and Danger over and under alarm
setpoints can be created for eachmeasurement individually as well as
configurable alarm attributes such as
enable/disable, alarm time delay (ATD), andlatching/non-latching.

Waveforms and Spectral Data

In addition, the alarming attributes(enable/disable, ATD, and latching/nonlatching) can be set independently on the Alert
and Danger alarms on the samemeasurement.

Acquisition of multiple synchronous andasynchronous waveforms can be configured
for each 3701 channel in the BNMC software.
These waveforms are used as the data sourcefor extraction of measurements that require
spectral data such as nX vectors and peak
extractions.

Relay logic is created in the graphical relay
logic editor in BNMC software by mapping the

11/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

System_1_Evolution
Connectivity

enabled alarms to OR and AND gates to drive arelay.
Individual relays can be configured aslatching/non-latching or enabled/disabledindependently (or in addition to) the settings
on the measurement alarms.

3701 monitors connect to System_1_Evolution
and support current value and time-based
data collection of all static values, waveforms,
and spectral data. This includes System 1
software's full suite of plots and tools forconditioned monitoring and asset
management.

Network Operation
The processor module supports two Ethernet
RJ45 physical connections located on theterminal base. The two connectors are termed
Net A and Net B and each has its own
configurable IP address. All configuration andinterface to Bently Nevada software and 3rdparty control and HMI devices use one or bothof these connections.

When an event is triggered on the 3701 monitor,
the high resolution alarm data shown below is
forwarded to System 1.

Display and HMI Options
Bently Nevada, LLC offers System 1 Basic as asimple, low cost, easily installed, and lightfootprint HMI. System 1 Basic is part of the
System_1_Evolution platform and offers asubset of System_1_Evolution functionality toprovide a basic operator display.

Trended Measurements:
Duration

The Modbus TCP or EGD industrial protocols canbe used to serve data to an HMI where users
can build display environments using standard
3rd party HMI software.

Bently Nevada Configuration
Software (BNMC)
BNMC software is necessary to configure andverify the 3701/46 Hydro Monitor.

Intervals

10 minutes

1 second

Pre-event Data20
seconds

100
milliseconds

Post-event
Data

10 seconds

100
milliseconds

1 minute

1 second

Spectrums/Waveforms:

Bently Nevada Monitor Configuration software
will run on most Windows desktop or notebook
computers and is designed and fully tested for
operation on Microsoft Windows 7, 8 .1 and 10(64 bit) and Microsoft Windows 2008, 2012 and2016 (64 bit).
Language support at the current time is English
version operating systems with keyboard
preference set to English.

DurationIntervals

Pre-event Data

2.5 minutes

10 seconds

Post-event Data

1 minute

10 seconds

In case of network disruption between
the 3701 and System 1t, the 3701 canstore up to 512MB of Alarm fata and
512MB of transient data.
t Requires System_1_Evolution 17.2 or

BNMC is ordered separately from the monitor
hardware. See the spares section in theSpecifications portion of this datasheet for thepart number.

12/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

channel. Trip multiply can be activated via a setof hardware contacts by a manual input, acontrol system relay, or a 3701 output module
relay actuated by the RLZ or othermeasurement corresponding to the temporary
event or condition.

newer and Firmware release 4.1 ornewer for 3701/4x.

Applications
This section describes selected applications
where the 3701 functions and features offers
particular benefits.

Gear Boxes
When a hydroelectric generating unit has agearbox, the 3701 is a flexible and powerful tool
for monitoring specific vibration frequencies
associated with not only rotor-related vibrationand position, but also gear teeth and gear
mesh health. A Keyphasor signal may berequired to activate these measurements.

Radial Shaft Vibration, Axial Position, andCasing/ Structural Absolute Vibration
3701 supports the standard industry
measurements for these applications. In
addition, the 3701/46 default Radial Vibration
and Acceleration channels have userconfigurable bandpass trended variables for
Rough Load Zone and Cavitation, respectively.
Detection of specific mechanical, electrical, andhydraulic faults can be enabled by additional
3701/46 user-configurable mesurements. For
example, discrete frequencies of vibration on ahydroelectric generating unit can be a functionof the number of runner buckets/vanes, wicket
gates, or electrical grid frequency. >>The 3701
allows users to create custom measurementsthat track these frequencies of interest using
spectral bands, bandpass timebase
measurements, amplitude extractions, nX
measurements, integrated and nonintegrated, and rms or peak measurements.

This short section is intended only to highlightsome particular features of the 3701 system.

Trip Multiply
Some events or operating conditions cancause temporarily high levels of vibration. One
common example is Rough Load Zone (RLZ) on
Francis type turbines operating under part loadconditions. While in RLZ conditions the alarm
thresholds set for full load conditions may be
exceeded, resulting in nuisance alarms.

FeatureDescription

Gear Mesh(GM) 1X, 2X, or
3X

Set a synchronous spectral
band, or an nX
measurement (or both) on
the 1X, 2X, and 3X GM. For
each gear set.

If you know the fundamental
frequency of an expectedside band based on the gear
Gear Mesh Side
kinemantics then you canBands
set a synchronous spectral
band on a specific sideband.

To avoid nuisance alarms during periods of
expected high vibration while preserving tightalarm thresholds for normal operating
conditions, the 3701 Trip Multiply feature can beused to temporarily elevate alarm set points. A
set point multiplier of 1 to 5 (in increments of 0.1)
can be applied to Alert and Danger alarms,
individually for each measurement in each

Enhanced

13/24

For API 613 gearboxes where3701/46 ADAPT Hydro Monitor
DatasheetFeature103M9138 Rev. J

Description

XY radial vibration probes
are typically specified themeasurements
Technician can set the GMfrom Radial
related spectral bands
Vibration
described above as well as
Proximitors
nX’s based on hi and low
speed shaft Keyphasors.
For API 613 gearboxes where
axial position probes are
Enhanced
typically specified. Axial
measurements vibration can be measured
from Thrustby setting bandpass filtered
Positionor nX measurements in
Proximitors
addition to the conventional
thrust position
measurement.

Hydro Dynamic Pressure
The 3701/46 is compatible with certain 3rd party
dynamic pressure sensors (see Table 5 for the
known compatibility list). These sensors are
typically installed at the draft tube, head cover,wicket gate, and/or penstock of Francis andKaplan turbines to detect pressure pulsations
associated with vortices, Rough Load Zone, andcavitation. These measurements can help
detect and manage conditions that cause
erosion, component deterioration, and loss ofunit efficiency. The 3701/46 enables the user to
add measurements to the dynamic pressure
sensor channel(s) that can be customized forthe characteristics of each turbine and its
unique hydraulic conditions.

14/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Specifications
3701/46 Monitor Power
Requirements

LEDs
Module OK LED

Indicates when themodule is functioning

Protection Fault
LED

Indicates that the monitor
has experienced a fault
that is affecting
protection

User Inhibit LED

Indicates that there has
been a user initiatedinhibit of alarming
functionality

AttentionLED

Indicates a condition on
the monitor has occurredthat may require action

Danger LED

Indicates a Danger
condition

Alert LED

Indicates an Alertcondition

KPH 1 OK LED

Indicates that Keyphasor
signal 1 is triggering.

KPH2 OK LED

Indicates that Keyphasor
signal 2 is triggering.

12 dynamic signals and 2
Keyphasor/speed signals

Net A

Indicates that Network A
has a valid link

110 db @ 102.4 ksps

TX/RX A

Indicates that network
traffic is flowing on
Network A

Net B

Indicates that Network B
has a valid link

TX/RX B

Indicates that network
traffic is flowing on
Network B

PWR 1 OK

Indicates that the firstpower input is functioning
correctly

PWR 2 OK

Indicates that the second
power input is functioning

Min. 18 Vdc

Input
VoltageMax. 36 Vdc
2.3 amps max current (Simplex)

Current

3.0 amps max current (Duplex)

InrushCurrent

3.0 amps max inrush less than 5 mS
(Per processor card)
Supply must be 2006/95/EC Low
Voltage Directive compliant for CE
installations.

Supply must be Class I, Div 2 or Class I,
Zone 2, (CL2 SELV), compliant for
hazardous area Installations.

3701/46 Processor Module
Specifications
InputsMax.
Signal/Noise Ratio
A/D Conversion

Sigma- Delta 24 bit

Bandwidth

0.5 to 40 Khz

Outputs
Two Independent
Ethernet ports

Buffered Signal
Outputs

Net B: 10/100 BaseT
15 pin DSUB connector,
available accessory cablefor BNC and SMC options.
550 ohm output
impedance

15/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Keyphasor Input

correctly
Accuracy
Direct pk or rms

Speed Resolution

Within ± 0.5% of full-scale
typical,
1.1% Worst Case

Bias

+0.4 V / -0.8 V typical,+0.8V / -1.34 V worst case.

Phase Accuracy

Tracking Filters

nX tracking filters are havea bandwidth of 0.075X,
where X is the speed of theassociated speed
channel.

Setpoints

Over/under user
configurable

Time Delay

100 mS – 60 minutes

Latching
Input Impedance± 1 degree up to 20 kHz formost sensors ♦Use for any input above 1
rpm for 1 event/resolution.

Manual Threshold±150 mV, user selectablefrom +3.5 to -23.5 Vdc.

Hysteresis

User selectable from 0.2 to
10 volts.

Signal Amplitude

Minimum signal
amplitude for trigger is 2
volts peak-to-peak.

t>Phase accuracy on 2 wire sensors

All 3-wire Inputs(PAA & PAV)

Nominal input impedanceis 10 kW.

2-Wire Input –PAA(Aeroderivative)

Nominal differential input
impedance is 99.8 kW.

2-Wire Input –PAV (Velomitors)

Nominal constant current
is 3.3267 mA.

2-Wire Input –PAA - Speedchannels(Isolated
Magnetic Pickup)

32.08 kW when input
signal is below 30 Vpp,and a 9.98 kW when
above 30 Vpp

on the PAA input card has ± 1 degreeup >>>to 500 Hz and ± 5 degree up to
3 kHz> >Refer to Hazardous Area Special
Considerations Section for Maximum
Magnetic Pickup amplitude
requirements for hazardous area
applications.
Relay Output Specifications
Single Pole Double Throw(SPDT).

Speed Signal Inputs

Relay Type

Speed Range
Dedicated
1 to 120,000 rpm
Speed/Keyphasor
Input
Speed Range
Auxiliary±22.3 mV worst case

Auto Threshold

User configurable
alarming or relay latching

100 to 2000 rpm ± 1 rpm±8.2 mV typical

Gap

Alarming

1 to 100 rpm ± 0.1 rpm

Contact Ratings

1 to 10,000 rpm

16/24

Normally Open (NO),Normally Closed (NC),and Armature (ARM)
contacts
5A/250 Vac/1500 VA Max.
5A/250 Vdc/150 VA Max.

3701/46 ADAPT Hydro Monitor
Datasheet

Minimum
Switching Current
Normally DeEnergized (NDE) or
Normally
Energized (NE)

103M9138 Rev. J

12 Vdc/100 mA
NDE/NE independently
selectable for
Relays 1 – 4 and 5 – 8
using a switch on therelay module.

>Refer to Hazardous Area Special
Considerations Section for Relay
specifications when used inhazardous area applications.

17/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

3701/46 Environmental
Specifications
Indoor Use Only
OperatingTemperature
Range-30° C to +65° C♦

Storage
Temperature
Range-40C to +85C

Relative
Humidity
Vibration(-22° F to 149° F)(-40 F to 185 F)
0% to 95% rH noncondensing Operating andStorage
5g @ 57-500 Hz.
IEC 60068-2-6

Shock

15g, 11ms

Altitude< 2000 m (6,562 ft)

Pollution
DegreePollution Degree 2

Installation
Category

Category II♦ >If the 3701 is operated 100% at +65°C,

its life will be reduced toapproximately 11 years. Any portion of
the time it is operated below +65°C or
any convective airflow will increase its
lifespan.
Physical
Simplex BaseDimensions

26.7 x 20 x 18.2 cm(10.5 x 7.87 x 7.15 in)

Weight4.5 kg (9.9 lbs)

Mounting

Bulkhead
4 mounting bolts or
screws at corners

18/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. JlCompliance andCertificationsl

FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to thefollowing two conditions:llThis device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

EMC
EN 61000-6-2
EN 61000-6-4
EMC Directive 2014/30/EU

Electrical Safety
EN 61010-1
LV Directive 2014/35/EU

RoHS
RoHS Directive 2011/65/EU

ATEX
EN 60079-0
EN 60079-15
ATEX Directive 2014/34/EU

Cyber Security
Achilles Communications Certification
Level 1

Maritime
ABS 2009 Steel Vessels Rules
1-1-4/7.7,4-8-3/1.11.1,4-9-7/13
Complies with ABS Rules for Condition ofClassification, Part 1

19/24

2015 Steel Vessels Rules
2015 Offshore units and Structures

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. JlHazardous Area Approvals
For the detailed listing of country andproduct specific approvals, refer tothe Approvals Quick Reference Guide(108M1756) available fromwww.Bently.com.

l

CSA/NRTL/C
Class I, Zone 2: AEx nA nC IIC T4 Gc;
Class I, Zone 2: AEx ec nC IIC T4 Gc;
Class I, Division 2, Groups A, B, C, and D;
T4 @ Ta= -30˚C to +65˚C
When installed per drawing 100M1872

ATEX/IECEx
II 3 GEx nA nC IIC T4 Gc
T4 @ Ta= -30˚C to +65˚C
ATEX Special Conditions of Safe Uselll

The equipment shall only be used in anarea of not more than pollution degree 2,
as defined in IEC 60664-1.
The equipment shall be installed in an
enclosure that provides a degree ofprotection of not less than IP54 andwhich meets the enclosure requirementsof EN 60079-0 and EN 60079-7/EN 6007915. The enclosure shall be suitable for anambient temperature range of -30°C to+65°C and a service temperature of 80°C.
Transient voltage protection shall be
provided by the external circuits toensure that transient overvoltages to theequpment cannot exceed 140% of 85 V.

20/24

When installed in a metal enclosure, theenclosure shall have an external facitlity
for an earth bonding connection which
complies with EN 60079-0:2012/A11:2013
clause 15.1.2 and which is electrically incontact with the internal earth
connection facility on the equipment.
The relay output circuits shall not be
connected to circuits which exceed 30V,
5A.

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

SparesOrdering Information

Part Number

For the detailed listing of country and productspecific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.

Description

3701/46

3701/46 Hydro Monitor

177896-06

3701/46 Processor Module

177988-01

Prox Accel Seismic (PAS)Module177989-01

Prox Accel Velom(PAV)
ModuleSimplex

105M6001-01

Positive Input (POV) Module

B: Input Module 1>177897-01

3701 Output Relay Module01

Prox/Accel/Velom>175794

3701 Simplex Terminal Base

02

Prox/Accel/Seismic177992-01

04

Positive Input Module

3701 Terminal Block –Standard

100M9465-01

BN Monitor Configuration SW
DVD

3701/46–AA–BB–CC-DD- EE
A: Redundancy
01

C: Input Module 2
00

None

01

Prox/Accel/Velom

03

Prox/Accel/Seismic

04

Positive Input Module

Accessories
Part Number

D: Output Module
00

None

01

8 CH Relay Module

E: Approvals
00

Nonet

01

CSA

02

ATEX/IECEx

XX

Country Specifict This does include the nonhazardous area general safety
certification.

21/24

Description

323314-01

Buffered Output cable 15 pin
D-Sub to 7 SMA connectors.
(SMA connectors work with
the ADRE 408)

>323314-02

Buffered Output cable 15 pin
D-Sub to 7 BNC connectors>324343

Weatherproof Housing Kit>Bently_
Manuals

Customer DVD containing all
Bently Manuals, FWD, App
Notes, and Install Guides in all
available languages

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Figures

a.
b.
c.
d.
e.

Processor Module
Input Module 1
Input Module 2
Output Module
Terminal Base

Figure 1: 3701/46 Simplex Terminal Base Top View

22/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Figure 2: 3701/46 Simplex Terminal Base -Side View

23/24

3701/46 ADAPT Hydro Monitor
Datasheet

103M9138 Rev. J

Copyright 2021 Baker Hughes Company. All rights reserved.

Bently Nevada, Adapt, ADRE, COMMTEST, Keyphasor, Proximitor, Seismoprobe, System 1, Velomitor and Orbit Logo are
registered trademarks of Bently Nevada, a Baker Hughes Business, in the United States and other countries. The Baker
Hughes logo is a trademark of Baker Hughes Company. All other product and company names are trademarks of
their respective holders. Use of the trademarks does not imply any affiliation with or endorsement by the respective
holders.
Baker Hughes provides this information on an “as is” basis for general information purposes. Baker Hughes does notmake any representation as to the accuracy or completeness of the information and makes no warranties of any
kind, specific, implied or oral, to the fullest extent permissible by law, including those of merchantability and fitness
for a particular purpose or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect,
consequential or special damages, claims for lost profits, or third party claims arising from the use of theinformation, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to makechanges in specifications and features shown herein, or discontinue the product described at any time without
notice or obligation. Contact your Baker Hughes representative for the most current information.
The information contained in this document is the property of Baker Hughes and its affiliates; and is subject tochange without prior notice. It is being supplied as a service to our customers and may not be altered or its content
repackaged without the express written consent of Baker Hughes. This product or associated products may becovered by one or more patents. See Bently.com/legal.

1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 (US) or Bently.com/support
Bently.com

24/24