991 Thrust Transmitter
Bently Nevada* Asset Condition Monitoring
Description
The 991 Thrust Transmitter is intended primarily for the original equipment
manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or
fans who prefer to provide a simple 4 to 20 mA proportional axial displacement
(thrust) signal as the input to their machinery control system. The transmitter is a
2-wire, loop-powered device that accepts input from our 3300 NSv* proximity
probe and its matching extension cable (available in 5 m and 7 m system length
options). The transmitter conditions the signal into appropriate engineering units
proportional to the shaft’s axial position1, and provides it as a 4 to 20 mA
industry-standard signal for input to the control system where machinery
protection alarming and logic occurs2.
The 991 transmitter provides the following notable features:
•
•
•
•
•
•
•
•
•
Integrated Proximitor* Sensor requires no external unit
Non-isolated “PROX OUT " and "COM" terminals plus a coaxial connector
provide a dynamic vibration and gap voltage signal output for diagnostics3.
Non-interacting zero and span potentiometers under the Transmitter label
supports loop adjustment.
Test Input pin allows quick verification of loop signal output, using a variable
DC voltage source as the input.
A Power-up Inhibit circuit eliminates signal errors due to line voltage
transients.
A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a
faulty proximity probe or loose connection.
Choice of DIN-rail clips or bulkhead mounting screws as standard options
simplifies mounting.
Potted construction for high humidity (up to 100% condensing)
environments.
Compatibility with 3300 NSv proximity probe allows transducer installation
in small areas with minimal clearance, typical of centrifugal air compressors.
Notes:
1.
2.
3.
Probe adjustment and range are critical in thrust position measurements. Incorrect probe
gap settings may prevent the transmitter from reaching full-scale in either the normal or
counter directions (no machinery monitoring). For proper adjustment, follow the instructions
in the manual.
Thrust transmitters have many limitations when compared to a continuous monitoring
system. They are a practical solution in some applications for measuring rotor axial position
and are a valuable tool for trending thrust readings. While the transmitter is capable of
alarming on thrust position and non-OK checking, monitor functions such as Timed OK
channel defeat, Danger Bypass, and Trip Multiply cannot be used. In addition, PLCs attached
to the thrust transmitter are not suitable for plant-wide diagnostic systems such as System 1
or Rule Paks.
The 991 Vibration Transmitter's "Prox Out" coaxial connector provides a non-isolated
dynamic transducer signal for machinery diagnostics. You can connect this signal directly to
battery-powered or isolated test equipment to diagnose machinery problems. However,
since the "PROX OUT" signal is not isolated from the 4 to 20 mA loop signal, an interface is
available (and strongly recommended) for signal isolation. The 990/991 Test Adapter
conditions the 990 Transmitter's "PROX OUT" signal for use with ac-powered test equipment.
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 1 of 12
The adapter also inverts and isolates the 990's transducer signal,
making it suitable for equipment such as oscilloscopes and
analyzers, and preserving industry-standard conventions for signal
polarity. We strongly recommend that you use this test adapter for
all applications to maintain isolation between test equipment and
the loop signal, and to maintain machinery protection integrity.
Proximitor Sensor
Output
Compatible with ungrounded,
portable test equipment. When using
grounded, ac-powered test
equipment, use the 122115-01 Test
Adapter for signal isolation.
Specifications
Unless otherwise noted, the following specifications
apply at +22 °C (+72 °F) using a 3300 NSv Probe and
Extension Cable, and an AISI 4140 steel target.
Output Impedance
Prox Out has a 10 kΩ output
impedance calibrated for a 10 MΩ
load.
Electrical
Input
Linear Range
Accepts 1 non-contacting 3300 NSv
Proximity Probe and extension cable.
0.25 to 1.65 mm (10 to 65 mils) for
Prox Out. Suitable for 0.6-0-0.6 mm
or 25-0-25 mils current loop linear
ranges.
Power
Requires +12 to +35 Vdc input at the
transmitter terminal.
4 to 20 mA Signal
Output
Prox Out
Incremental Scale
Factor
7.87 mV/µm (200 mV/mil) ± 6.5%
typical including interchangeability
errors when measured in increments
of 0.25 mm (10 mils) over the linear
range using a flat 30 mm (1.2 inch)
target.
4 to 20 mAdc over specified full-scale
range in 2-wire configuration.
4 to 20 mA Loop
Accuracy
Within ±1.5% over specified full scale
range (typical). Accuracy is rated
from the TEST signal input to the
voltage measured across a 250 Ω
loop resistance.
Temperature
Stability
Incremental scale factor remains
within ±10% of 7.87 mV/µm
(200
mV/mil) from 0 °C to +70 °C (+32 °F to
+158 °F).
Maximum Loop
Resistance
1,000 Ω including cable at 35 Vdc.
Current Limiting
23 mA typical.
Zero and Span
Minimum target
size
9.5 mm (0.375 in) diameter.
Leadwire Length
Proximitor* Sensor Output (BNC
connector), maximum cable distance
is 3 metres (10 feet).
Non-interacting external
adjustments.
Not OK/Signal
Defeat
Signal output will go to less than 3.6
mA within 100 µs after a Not OK
condition occurs. Signal output is
restored within 0.1 seconds after the
Not OK condition is removed.
Non-Hazardous,
Zone 2 or Div 2
Hazardous area
locations
13 km (8 miles) maximum between
transmitter and receiving device for
signal output.
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 2 of 12
Probe Temperature
Intrinsically Safe
Hazardous area
locations
Operating
Temperature
68 metres (225 ft.) maximum
between transmitter and receiving
device for signal output.
Electrical
Classification
-35 °C to +177 °C (-31 °F to +350 °F).
Storage
Temperature
-51 °C to +177 °C (-60 °F to +350 °F).
General Purpose Approval by
Canadian Standards Association
(CSA/NRTL/C) in North America and
by VDE in Europe. The 991 has the CE
mark for Europe.
Hazardous Area Approvals
CSA/NRTL/C
Class I, Div 2
Groups A, B, C, D
T5 @ Ta = 85 °C, Type 4
Per Drawing 128838
Relative Humidity
100% condensing, non-submerged,
with protection of coaxial connectors.
Mechanical
Transducer Tip
Material
Polyphenylene sulfide (PPS).
Transducer Case
Material
AISI 303 or 304 Stainless Steel (SST).
ATEX
II 1 G
Probe Cable
75Ω coaxial, fluoroethylene
propylene (FEP) insulated.
Ex ia IIC T4
T4 @ -35°C ≤ Ta ≤ +85°C
II 3 G
Cable Armor
(optional)
Flexible AISI 302 SST with optional
FEP outer jacket.
Ex nA IIC T4
T4 @ -35°C ≤ Ta ≤ +85°C
Maritime Approvals
Tensile Strength
222 N (50 lbf) probe case to probe
lead, maximum.
American Bureau of Shipping (ABS) Type
Approval
Transmitter Weight
Certification
Number
0.43 kg (0.9 lbm).
06-HS177078-PDA
Environmental Limits
Transmitter
Temperature
Total System
Weight
0.82 kg (1.8 lbm) typical.
Ordering Information
Operating
Temperature
991-AXX-BXX-CXX-DXX
-35 °C to +85 °C (-31 °F to +185 °F)
Storage
Temperature
A:
Full-scale Option
06
25
B:
System Length Option
50
5.0 metres (16.4 feet)
70
7.0 metres (23.0 feet)
Mounting Option
-51 °C to +100 °C (-60 °F to +212 °F).
C:
0.6 -0- 0.6 mm
25-0-25 mils
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 3 of 12
01
35 mm DIN-rail clips
02
Bulkhead screws
03
DIN clips and screws
D: Agency Approval Option
00
Not required
01
CSA Division 2
05
CSA Division 2, ATEX Zone 0, ATEX
Zone 2 and includes ABS maritime
approval
3300 NSv Proximity Probes
330901
3300 NSv Probe, 1/4-28 UNF thread,
without armor.
0 2 Miniature coaxial ClickLoc connector,
standard cable
1 1 Miniature coaxial ClickLoc connector
with connector protector, FluidLoc*
cable
1 2 Miniature coaxial ClickLoc connector
attached, FluidLoc cable
E: Agency Approval Option
0 0 Not required
0 5 Multiple Approvals (CSA NRTL/C and
BASEEFA/CENELEC, which includes
CSA Division 2)
3300 NSv Probes, Metric
330903
330902
3300 NSv Probe, 1/4-28 UNF thread,
with armor.
3300 NSv Probe, M8 x 1 thread,
without armor.
330904
330908
3300 NSv Probe, 3/8-24 UNF thread,
without armor.
3300 NSv Probe, M8 x 1 thread, with
armor.
330905
330909
3300 NSv Probe, 3/8-24 UNF thread,
with armor.
3300 NSv Probe, M10 x 1 thread,
without armor.
330910
Part Number-AXX-BXX-CXX-DXX-EXX
3300 NSv Probe, M10 x 1 thread,
with armor.
Option Descriptions
A: Unthreaded Length Option
Note: Unthreaded length must be at least 0.7
in less than the case length.
Order in increments of 0.1 in
Length configurations:
Minimum length: 0 in
Maximum length: 9.2 in
Example: 0 4 = 0.4 in
B: Case Length Option
Order in increments of 0.1 in
Threaded length configurations:
Minimum length: 0.8 in
Maximum length: 9.9 in
Example: 3 5 = 3.5 in
C: Total Length Option
05
0.5 metre (1.67 feet)
10
1.0 metre (3.25 feet)
50
5.0 metres (16.4 feet)
70
7.0 metres (23 feet)
D: Connector Option
0 1 Miniature coaxial ClickLoc*
connector with connector protector,
standard cable
Part Number-AXX-BXX-CXX-DXX-EXX
Option Descriptions
A: Unthreaded Length Option
Note: Unthreaded length must be at least 20
mm less than the case length.
Order in increments of 10 mm
Untreaded length configurations:
Minimum length: 0 mm
Maximum length: 230 mm
Example: 06 = 60 mm
B: Case Length Option
Order in increments of 10 mm
Minimum length: 20 mm
Maximum length: 250 mm
Example: 25 = 250 mm
C: Total Length Option
05
0.5 metre (1.67 feet)
10
1.0 metre (3.25 feet)
50
5.0 metres (16.4 feet)
70
7.0 metres (23 feet)
D: Connector Option
0 1 Miniature coaxial ClickLoc connector
with connector protector, standard
cable
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 4 of 12
0 2 Miniature coaxial ClickLoc connector,
standard cable
1 1 Miniature coaxial ClickLoc connector
with connector protector, FluidLoc
cable
1 2 Miniature coaxial ClickLoc connector
attached, FluidLoc cable
E: Agency Approval Option
00
Not required
05
Multiple Approvals (CSA NRTL/C
and BASEEFA/CENELEC, which
includes CSA Division 2)
3300 NSv Reverse Mount Probe
330906-02-12-CXX-DXX-EXX, 3/8-24 UNF threads
330907-05-30-CXX-DXX-EXX, M10 x 1 UNF threads
Option Descriptions
C: Total Length Option
05
0.5 metre (1.67 feet)
10
1.0 metre (3.25 feet)
50
5.0 metres (16.4 feet)
70
7.0 metres (23 feet)
D: Connector Option
0 2 Miniature coaxial ClickLoc connector,
standard cable
1 2 Miniature coaxial ClickLoc connector
attached, FluidLoc cable
E: Agency Approval Option
00
Not required
05
Multiple Approvals (CSA NRTL/C
and BASEEFA/CENELEC, which
includes CSA Division 2)
Extension Cable
00
05
Not required
Multiple Approvals (CSA NRTL/C
and BASEEFA/CENELEC (which
includes CSA Division 2)
Accessories
122115-01
990/991 Test Adapter. Package
includes: 990/991 Test Adapter, 9V
battery, Universal ac Adapter, Power
Cord (North American), User Guide
and Soft Carrying Case.
The 990/991 Test Adapter inverts and
isolates the PROX OUT signal from
the 991 Transmitter so you can
connect 991 Transmitters to acpowered diagnostic equipment. The
Adapter modifies the PROX OUT
signal so that it matches our
Proximitor Sensor signals by
performing these functions:
•
Shifts the phase of the PROX
OUT signal by 180º by
changing the voltage from
positive to negative
•
Isolates the transmitter from
diagnostic equipment so
that equipment with
different grounds will not
affect the transmitter's 4-20
mA loop signal
•
Reduces noise in the
surrounding area from
affecting the PROX OUT
signal
330930-AXXX-BXX-CXX
A: Cable Length Option
040
045
060
065
B: Armor Option
00
01
02
03
04
05
C: Agency Approval Option
4.0 metres (13.1 feet)
4.5 metres (14.8 feet)
6.0 metres (19.7 feet)
6.5 metres (21.3 feet)
Without stainless steel armor
With FEP covered stainless steel
armor
With stainless steel armor
Without stainless steel armor,
with connector protector
With FEP covered stainless steel
armor and connector protector
With stainless steel armor and
connector protector
The 990/991 Test Adapter provides
the following benefits:
•
Small size and weight for
portable operation
•
Battery or ac adapter power
options
•
Automatic shutoff circuit
that powers down the unit
when the battery is low
•
2 channels, so that you can
display an orbit for XY probe
configurations.
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 5 of 12
990/991 Test Adapter Accessories
connector installation instructions.
Supplied with carrying case.
330951-01
123266-01
Coaxial Cable Kit. Includes 4 cables
with length of 1.5 metres (5 feet)
each.
02211505
Single coaxial cable with length of
1.5 metres (5 feet).
991 Mounting Screws (spares).
Contains 4 screws.
284726
DIN rail mounting kit. Installed on
the 990 Transmitter to allow
mounting on 35 mm DIN rail.
990/991 Test Adapter Spare Parts
01810700
Battery (9 volt alkaline).
02270056
Ac adapter. Has universal ac input
to 9 volts dc output. Input is 108 to
132 Vac with 120 Vac nominal, or
207 to 253 Vac with 240 Vac
nominal.
02198937
Power cord (for North American ac
power outlet).
123133-01
User Guide.
Probe and Transmitter Accessories
02173006
Bulk Cable (specify length in feet).
1.0 mm2 (18 AWG), 2-conductor,
twisted, shielded cable used for the 4
to 20 mA loop. Also used for the PROX
OUT signal on the 991 Transmitter's
terminal strip.
123655-01
Manual.
330153-05
Cable Connector Kit. Package
Includes 1 set of 75 Ω miniature male
and female connectors, shrink tubing
and 3300 Isolator Seal for protection
of coaxial connectors.
163356
Connector Crimp Tool Kit. Includes
one set of 75 Ω ClickLoc inserts and
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 6 of 12
Dimensional drawings
Note: All dimensions shown in millimetres (inches) unless noted otherwise.
1
2
1.
Mounting holes, 5.8 mm (0.23 in) diameter, 4 places
2.
Bulkhead mount holes, 4 each. 6-32 x 1.326 screws provided when mounting option specified
Figure 1: 991 Thrust Transmitter Dimensions (Top View)
1
1.
35mm DIN rail DIN mount clips (when DIN rail mounting is specified)
Figure 2: 991 Thrust Transmitter Dimensions (Side View)
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 7 of 12
4
2
3
1
5
6
3.23 (0.127)
7
8
9
10
1.
Probe tip, 5.26 mm (0.207 in) maximum diameter
2.
Hexagonal nut
3.
Case Thread
4.
Wrench flats
5.
75Ω cable, 2.8 mm (0.11 in ) maximum outside diameter, 7.6 mm (0.30 in) maximum outside diameter
of armor
6.
Miniature male coaxial connector, 7.23 mm (0.285 in) maximum outside diameter “D”
7.
Unthreaded length “A”
8.
Case length “B”
9.
2.92 mm (0.115 in) maximum
10. Total length “C”, +30%, -0%
Figure 3: 3300 NSv Proximity probes, Standard Mount
330901, 1/4-28 UNF-2A, without armor
330902, 1/4-28 UNF-2A, with armor
330903, M8x1 thread, without armor
330904, M8x1 thread, with armor
330905, M10x1 thread, without armor
330908, 3/8-24 UNF-2A, without armor
330909, 3/8-24 UNF-2A, with armor
330910, M10x1 thread, with armor
Notes:
Standard mount 1/4-28 UNF thread probes are supplied with a 7/16 inch lock nut and 7/32 inch wrench flats.
Standard mount M8x1 thread probes are supplied with a 13 mm lock nut and 7 mm wrench flats.
Standard mount 3/8-28 UNF thread probes are supplied with a 9/16 inch lock nut and 5/16 inch wrench flats.
Standard mount M10x1 thread probes are supplied with a 17 mm lock nut and 8 mm wrench flats.
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 8 of 12
1
2
3
1
4
1.
12 mm (0.49 in) maximum diameter
2.
36.3 mm (1.43 in) maximum
3.
51.1 mm (2.01 in) maximum
4.
Connector protector (fluorosilicone material)
Figure 4: Installed Connector Protectors
2
3
1
4
7
5
6
8
9
10
1.
Probe tip, 5.26 mm (0.207 in) maximum diameter
2.
Hexagonal nut
3.
Case thread
4.
75Ω cable, 2.8 mm (0.11 in) outside diameter
5.
Miniature male coaxial connector, 7.23 mm (0.285 in) maximum outside diameter “D”
6.
5.08 mm (0.20 in)
7.
Unthreaded case length “A”, 5.08 mm (0.20 in)
8.
Case length “B”, 30.48 mm (1.20 in)
9.
2.92 mm (0.115 in) maximum
10. Total length “C”, +30%, -0%
Figure 5: 3300 NSv Proximity Probes, Reverse Mount
330906, 3/8-24 UNF-2A
330907, M10x1 thread
Notes:
Reverse mount probes are not available with armor or connector protector options.
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 9 of 12
1.
7.2 mm (0.285 in) maximum diameter
2.
Miniature male coaxial connector
3.
FEP-coated or uncoated armor, armor length is 300 mm (11.8 in) less than cable length
4.
75Ω cable, 2.80 mm (0.11 in) maximum outside diameter, 7.6 mm (0.30 in) maximum outside diameter
of armor, 7.0 mm (0.275 in) maximum outside diameter of uncoated armor
5.
Stainless steel ferrules, 8.4 mm (0.33 in) diameter
6.
FEP-insulated coaxial cable
7.
Miniature female coaxial connector
8.
Cable length +20%, -0%
Figure 6: 3300 NSv Extension Cable
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 10 of 12
1
3
4
2
5
6
7
9
8
1.
To test adapter 122115-01
2.
Receiver
3.
Cable shield
4.
Transmitter
5.
Extension cable
6.
Recommended wiring is shielded, twisted-pair, 1.0 mm (18 AWG) (part number 02173006). Maximum
length is 13 km (8 miles).
7.
Power supply, VPS = 17 to 35 Vdc
8.
Common (ground)
9.
Probe
Figure 7: 991 Thrust Transmitter loop wiring connections
Application Advisory
The phase of the PROX OUT signal is inverted from the standard
for Bently Nevada™ products. Also, connecting grounded acpowered equipment to PROX OUT may result in a false alarm.
Use test adapter 122115-01 to connect ac equipment to the
transmitter. Note that the 122115-01 also inverts the PROX OUT
signal.
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 11 of 12
1000
750
1
500
3
250
0
12
15
20
25
30
35
2
1.
Maximum loop resistance in ohms (RLOOP)
2.
Power supply voltage (VPS)
3.
Operating region
Figure 8: 991 Thrust Transmitter maximum loop resistance
Note:
RLOOP = 43.5 x (Vps – 12) Ω maximum. If the maximum loop resistance is exceeded, then the full scale current will not reach 20 mA.
* denotes trademarks of Bently Nevada, LLC, a wholly owned subsidiary of General Electric Company.
© 2006 – 2009 Bently Nevada LLC. All rights reserved.
1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 775.782.3611
Fax: 775.215.2873
www.ge-energy.com/bently
Specifications and Ordering Information
Part Number 141618-01
Rev. D (08/09)
Page 12 of 12