PCB Piezotronics IMI SENSORS 646B01 User manual

Model 646B01
4-20 mA Output Accelerometer
Installation and Operating Manual
For assistance with the operation of this product,
contact PCB Piezotronics, Inc.
Toll-free: 800-959-4464
24-hour SensorLine: 716-684-0001
Fax: [phone]
E-mail: [email protected]
Web: www.imi-sensors.com

Manual 21354 Rev E
ECN 50523
Repair and Maintenance
PCB guarantees Total Customer Satisfaction through its
“Lifetime Warranty Plus” on all Platinum Stock Products
sold by PCB and through its limited warranties on all other
PCB Stock, Standard and Special products. Due to the
sophisticated nature of our sensors and associated
instrumentation, field servicing and repair is not
recommended and, if attempted, will void the factory
warranty.
Beyond routine calibration and battery replacements
where applicable, our products require no user
maintenance. Clean electrical connectors, housings, and
mounting surfaces with solutions and techniques that will
not harm the material of construction. Observe caution
when using liquids near devices that are not hermetically
sealed. Such devices should only be wiped with a
dampened cloth—never saturated or submerged.
In the event that equipment becomes damaged or ceases
to operate, our Application Engineers are here to support
your troubleshooting efforts 24 hours a day, 7 days a
week. Call or email with model and serial number as well
as a brief description of the problem.
Calibration
Routine calibration of sensors and associated
instrumentation is necessary to maintain measurement
accuracy. We recommend calibrating on an annual basis,
after exposure to any extreme environmental influence,
or prior to any critical test.
PCB Piezotronics is an ISO-9001 certified company whose
calibration services are accredited by A2LA to ISO/IEC
17025, with full traceability to SI through N.I.S.T. In
addition to our standard calibration services, we also offer
specialized tests, including: sensitivity at elevated or
cryogenic temperatures, phase response, extended high
or low frequency response, extended range, leak testing,
hydrostatic pressure testing, and others. For more
information, contact your local PCB Piezotronics
distributor, sales representative, or factory customer
service representative.
Returning Equipment
If factory repair is required, our representatives will
provide you with a Return Material Authorization (RMA)
number, which we use to reference any information you
have already provided and expedite the repair process.
This number should be clearly marked on the outside of
all returned package(s) and on any packing list(s)
accompanying the shipment.
Contact Information
PCB Piezotronics, Inc.
3425 Walden Ave.
Depew, NY14043 USA
Toll-free: [phone]
24-hour SensorLine: [phone]
General inquiries: in[email protected]
Repair inquiries: [e-mail]
For a complete list of distributors, global offices and sales
representatives, visit our website, www.pcb.com.
Safety Considerations
This product is intended for use by qualified personnel
who recognize shock hazards and are familiar with the
precautions required to avoid injury. While our equipment
is designed with user safety in mind, the protection
provided by the equipment may be impaired if equipment
is used in a manner not specified by this manual.
Discontinue use and contact our 24-Hour Sensorline if:
Assistance is needed to safely operate equipment
Damage is visible or suspected
Equipment fails or malfunctions
For complete equipment ratings, refer to the enclosed
specification sheet for your product.
Definition of Terms and Symbols
The following symbols may be used in this manual:
DANGER
Indicates an immediate hazardous
situation, which, if not avoided, may
result in death or serious injury.

Manual 21354 Rev E
ECN 50523
CAUTION
Refers to hazards that could damage
the instrument.
NOTE
Indicates tips, recommendations and
important information. The notes
simplify processes and contain
additional information on particular
operating steps.
The following symbols may be found on the equipment
described in this manual:
This symbol on the unit indicates that
high voltage may be present. Use
standard safety precautions to avoid
personal contact with this voltage.
This symbol on the unit indicates that
the user should refer to the operating
instructions located in the manual.
This symbol indicates safety, earth
ground.

Manual 21354 Rev E
ECN 50523
PCB工业监视和测量设备 - 中国RoHS2公布表
PCB Industrial Monitoring and Measuring Equipment - China RoHS 2 Disclosure Table
部件名称
有害物质
铅(Pb)
汞
(Hg)
镉
(Cd)
六价铬(Cr(VI))
多溴联苯 (PBB)
多溴二苯醚(PBDE)
住房
O
O
O
O
O
O
PCB板
X
O
O
O
O
O
电气连接器
O
O
O
O
O
O
压电晶体
X
O
O
O
O
O
环氧
O
O
O
O
O
O
铁氟龙
O
O
O
O
O
O
电子
O
O
O
O
O
O
厚膜基板
O
O
X
O
O
O
电线
O
O
O
O
O
O
电缆
X
O
O
O
O
O
塑料
O
O
O
O
O
O
焊接
X
O
O
O
O
O
铜合金/黄铜
X
O
O
O
O
O
本表格依据 SJ/T 11364 的规定编制。
O：表示该有害物质在该部件所有均质材料中的含量均在 GB/T 26572 规定的限量要求以下。
X：表示该有害物质至少在该部件的某一均质材料中的含量超出 GB/T 26572 规定的限量要求。
铅是欧洲RoHS指令2011/65/ EU附件三和附件四目前由于允许的豁免。
CHINA RoHS COMPLIANCE

Manual 21354 Rev E
ECN 50523
Component Name
Hazardous Substances
Lead (Pb)
Mercury (Hg)
Cadmium (Cd)
Chromium VI
Compounds
(Cr(VI))
Polybrominated
Biphenyls (PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
Housing
O
O
O
O
O
O
PCB Board
X
O
O
O
O
O
Electrical Connectors
O
O
O
O
O
O
Piezoelectric Crystals
X
O
O
O
O
O
Epoxy
O
O
O
O
O
O
Teflon
O
O
O
O
O
O
Electronics
O
O
O
O
O
O
Thick Film Substrate
O
O
X
O
O
O
Wires
O
O
O
O
O
O
Cables
X
O
O
O
O
O
Plastic
O
O
O
O
O
O
Solder
X
O
O
O
O
O
Copper Alloy/Brass
X
O
O
O
O
O
This table is prepared in accordance with the provisions of SJ/T 11364.
O: Indicates that said hazardous substance contained in all of the homogeneous materials for this part is below the limit
requirement of GB/T 26572.
X: Indicates that said hazardous substance contained in at least one of the homogeneous materials for this part is above the limit
requirement of GB/T 26572.
Lead is present due to allowed exemption in Annex III or Annex IV of the European RoHS Directive 2011/65/EU.

Model 640/641/645/646 B Series Industrial 4-20mA Sensor
Operating Guide with Enclosed Warranty Information
3425 Walden Avenue, Depew, New York 14043-2495
Phone [phone]
Fax [phone]
Toll Free Line 1-800-959-4IMI
MANUAL NUMBER: 25317
MANUAL REVISION: E
ECN NUMBER: 49766

PAGE 2
Table of Contents
Introduction...................................................................................................................... Page 3
General Features
Dimension Drawing......................................................................................................... Page 4
Operation and Wiring ...................................................................................................... Page 5
Standard Wiring
Taking Measurements
RV Option
RVVO Option
TO Option
Installation....................................................................................................................... Page 9
Direct Adhesive Mount
Standard Stud Mount
Adhesive Stud Mount
Magnetic Mount
ESD Sensitivity............................................................................................................... Page 13
Warranty/Servicing
Warranty, Service & Return Procedure .......................................................................... Page 14
Customer Service........................................................................................................... Page 15

PAGE 3
Introduction
The Model 640/641/645/646 B Series Industrial 4-20mA Sensors combine the capabilities of a piezoelectric
vibration sensor and a 4-20mA vibration transmitter. The sensor outputs a 4-20mA signal that is proportional to
the overall velocity or acceleration of the machinery. Ideal for monitoring the vibration of process equipment such
as fans, motors and pumps, the output of the sensor is used for process control or predictive maintenance. There
are many options in this series. Please refer to specific specification sheets for further details.
General Features
Imbedded Piezoelectric Accelerometer for improved accuracy and frequency response.
Vibration range can be in Acceleration or Velocity.
Allows for continuous vibration monitoring of critical applications.
Reduces sophisticated vibration analysis requirements.
RV (Raw Vibration) option for conducting frequency analysis and machinery diagnostics.
RVVO (Raw Vibration Velocity Output) option for conducting freq. analysis and machinery diagnosis.
TO (Temperature Output) option via an independent 4-20mA loop.
Readily interfaces to existing process control and predictive maintenance equipment.
Rugged stainless steel construction for applications in harsh environments.
Flexible design allows for various custom requirements.

PAGE 4
Dimension Drawing

PAGE 5
Operation and Wiring
Standard Wiring
The Model 640/641/645/646 B Series operates from a standard 2-Wire, 4-20mA loop. If using a loop powered
unit, attach the positive (+) input from the power supply to Pin A or Red wire on the sensor and the negative (-)
input from the power supply to Pin B or Blue Wire of the sensor.
Figure 1 –wiring: loop powered Figure 2 –wiring: loop powered/DC source
If using a standard DC power supply, install either an ammeter and/or load resistor in line with the output, Pin B or
Blue Wire.
The resistor will generate a DC voltage that is proportional to current by:
V = IR
If R = 500 ohms and I = 6 mA, then V = 3 VDC
Note:
- Resistor value must be less than: (Vsupply –12) x 50.
- For integral cable sensors: RED wire is positive, BLUE wire is negative.

PAGE 6
Taking Measurements
When measuring the current output from the unit, use the following formula to calculate the vibration level:
Vibration Output = (Measured Output –4mA) x (Full Scale Vibration Output /16mA)
Measured mA 640BX0 640BX1 640BX2
4.00 0.0 ips, pk 0.0 ips, pk 0.0 ips, pk
8.00 0.125 ips, pk 0.25 ips, pk 0.5 ips, pk
12.0 0.25 ips, pk 0.5 ips, pk 1.0 ips, pk
15.75 0.37 ips, pk 0.73 ips, pk 1.47 ips, pk
20 0.5 ips, pk 1.0 ips, pk 2.0 ips, pk
Measured mA 641BX0 641BX1 641BX2
4.00 0.0 ips, rms 0.0 ips, rms 0.0 ips, rms
8.00 0.125 ips, rms 0.25 ips, rms 0.5 ips, rms
12.0 0.25 ips, rms 0.5 ips, rms 1.0 ips, rms
15.75 0.37 ips, rms 0.73 ips, rms 1.47 ips, rms
20 0.5 ips, rms 1.0 ips, rms 2.0 ips, rms
Measured mA 645 646
4.00 0.0 g rms 0.0 g rms
8.00 1.25 g rms 2.50 g rms
12.0 2.50 g rms 5.00 g rms
15.75 3.67 g rms 7.34 g rms
20 5.00 g rms 10.0 g rms

PAGE 7
RV Option
The RV (raw vibration) option includes a 100mV/g ±20% additional output. The accelerometer frequency range is
1 Hz-1 kHz, maximum amplitude of 15 g-pk. Data collectors or analyzers can use this vibration signal for further
analysis. This output is extended to the RVVO (Raw Vibration Velocity Output) option, which integrates the signal
to a value of 100 mV/IPS (±20%).
Figure 3 –RV and RVVO wiring
For integral cable sensors:
RED 4-20mA Positive
BLACK 4-20mA Negative (same as green)
GREEN –RV and RVVO negative (same as black)
WHITE +RV and RVVO positive
Note:
-The RV and RVVO Signal Negative has to be isolated from any grounding. If this terminal is grounded, the 4-
20mA loop will short, causing no output.
-The RV and RVVO output signal is ideally suited for use with portable battery powered data collectors or
analyzers.

PAGE 8
TO Option
The TO (Temperature Output) option includes an additional independent 4-20mA output for temperature
measurement. The temperature range is from -40°C to 125°C with an overall accuracy of ±5%FSO. The
imbedded temperature sensor monitors the environment internal to the sensor housing and is situated at
approximately mid level.
Figure 4 –TO wiring
For integral cable sensors:
RED 4-20mA Vibration Positive
BLACK 4-20mA Vibration Negative
GREEN 4-20mA Temperature Negative
WHITE 4-20mA Temperature Positive
Note:
- The same power supply can be used for both 4-20mA loops. Connect both positive terminals directly to the
power supply, then use the negative terminals for independent process loops.

PAGE 9
Installation
When choosing a mounting method, consider closely the advantages and disadvantages of each technique.
Typical mounting types are stud, direct adhesive, adhesive mounting base and magnetic mounting base. Since
the frequency response is limited to 1 kHz on the 640/641, any of the four methods can be used without seriously
affecting the data values. The mounting method might affect some of the 645/646 series because of the
increased frequency response.
Direct Adhesive Mount Procedure
For restrictions of space or for convenience, most sensors (with the exception of integral stud models) can be
adhesive-mounted directly to the machine surface.
STEP 1 Prepare a smooth, flat surface. A minimum surface finish of 63 µin [0.0016 mm] generally works best.
STEP 2 Place a small portion of adhesive on the underside of the sensor. Firmly press down on the top of the
assembly to displace any adhesive. Be aware that excessive amounts of adhesive can make sensor removal
difficult.
Figure 5–direct adhesive mounting

PAGE 10
Standard Stud Mount Procedure
This mounting technique requires smooth, flat contact surfaces for proper operation and is recommended for
permanent and/or secure installations. Stud mounting is also recommended when testing at high frequencies.
Note: DO NOT attempt mounting on curved, rough or uneven sufaces, as the potential for misalignmen and
limited contact surface may significantly reduce the senor’s upeer operating frequnecy range.
Figure 6–direct adhesive mounting
1/4-28 stud 1/4-28 Captive Screw-*
A (in) 0.250 0.250
B (in) 0.350 0.350
Torque (ft-lb) 2 to 5 2 to 5
STEP 1 First, prepare a smooth, flat mounting surface, and then drill and tap a mounting hole in the center of this
area as shown in Figure 6. A precision-machines mounting surface with a minimum finish of 63 µin [0.0016 mm] is
recommended. (If it is not possible to properly prepare the machine surface, consider using an adhesive mounting
pad as a possible alternative.) Inspect the area, checking that there are no burrs or other foreign particles
interfering with the contact surface.
STEP 2 Wipe clean the mounting surface and spread on a light film of grease, oil or similar coupling fluid prior to
installation.
Figure 7–mounting surface lubrication.
Adding a coupling fluid improves vibration transmissibiliy by filling small voids in the mounting surface and
increasing the mounting stiffness. For semi-ermanent mounting, substitue epoxy or another type of adhesvie.
STEP 3 HAND –tighten the sensor/mounting stud to the machine, then secure the sensor with a torque wrench
to the mounting surface by applying the recommended mounting torue ( see enclosed specification data sheet for
proper mounting torque). It is important to use a toque wrench during this step. Under-toruing the sensor may
not adequately couple the device; over-torquing may result in stud failure and possible permanent
damage.

PAGE 11
Adhesive Stud Mount Procedure
Adhesive mounting is often used for temporary installation or when the machine surface cannot be adequately
prepared for stud mounting. Adhesives like hot glue or wax work well for temporary mounts; two-part epoxies and
quick –bonding gels provide a more permanent mount.
Note: Adhesively mounted sensors often exhibit a reduction in high-frequency range. Generally, smooth surfaces
and stiff adhesvies provide the best frequency response.
This method involves attaching a base to the machine surface, then securing the snesor to the base. This alows
for easy removal of the accelerometer.
STEP 1 Prepare a smooth, flat mounting surface. A minimum surface finish of 63 µin [0.0016 mm] generally
works best.
STEP 2 Stud-mount the sensor to the appropriate adhesive mounting base according to the guidelines set forth in
Steps 2 and 3 of the Standard Stud Mount Procedure.
STEP 3 Place a small portion of adhesive on the underside of the mounting base. Firmly press down on the
assembly to displace any extra adhesive remaining under the base.
Figure 8–mounting base: adhesive installation

PAGE 12
Magnetic Mount Procedure
Magnetic mounting provides a convenient means for making portable measurements and is commonly used for
machinery monitoring and other portable or tending applications.
Note: The correct magnet choice and an adequately prepared mounting surface is critical for obtaining reliable
measurements, especially at high frequencies. Poot installations can cause as much as a 50% drop in the sensor
frequency range.
Not every magnet is suitable for all applications. For example, rare earth magnets are commonly used
because of their high strength. Flat magners work well on smooth, flat surfaces, while dual-rail magnets
are required for curved surfaces. In the case o non-magnetic or rough surfaces, it is recommended that
the user first weld, epocy or otherwise adhere a stell mounting pad to the test surface. This provides a
smooth and repeatable location for mounting.
Figure 9–magnet types
STEP 1 After choosing the correct magnet type, inspect the unit, verifying that the mounting surfaces are flat and
smooth.
STEP 2 Stud- mount the accelerometer to the appropriate magnet according to the guidelines set forth in Steps 2
and 3 of the Standard Stud Mount Procedure.
STEP 3 Prepare a smooth, flat mounting surface. A minimum surface finish of 63 µin [0.0016 mm] generally
works best. After cleaning the surface and checking for burrs, wipe on a light film of silicone grease, machine oil
or similar-type coupling fluid.
STEP 4 Mount the magnet/sensor assembly to the prepared test surface by gently ‘rocking” or “sliding” it into
place.
Note: Magnetically mounting accelerometers carelessly as the potential to generate very high ( and very
damaging) g levels. To prevent damage, install the assembly gently. If unsure, please contact the factory for
assistance.

PAGE 13
Warning 1 –ESD sensitivity
The power supply/signal conditioner should not be opened by anyone other than qualified service
personnel. This product is intended for use by qualified personnel who recognize shock hazards and are familiar
with the safety precautions required to avoid injury.
Warning 2 –ESD sensitivity
This equipment is designed with user safety in mind; however, the protection provided by the equipment may be
impaired if the equipment is used in a manner not specified by PCB Piezotronics, Inc.
Caution 1 –ESD sensitivity
Cables can kill your equipment. High voltage electrostatic discharge (ESD) can damage electrical devices.
Similar to a capacitor, a cable can hold a charge caused by triboelectric transfer, such as that which occurs in the
following:
Laying on and moving across a rug,
Any movement through air,
The action of rolling out a cable, and/or
Contact with a non-grounded person.
The solution for product safety:
Connect the cables only with the AC power off.
Temporarily “short” the end of the cable before attaching it to any signal input or output.
Caution 2 –ESD sensitivity
ESD considerations should be made prior to performing any internal adjustments on the equipment. Any
piece of electronic equipment is vulnerable to ESD when opened for adjustments. Internal adjustments should
therefore be done ONLY at an ESD-safe work area. Many products have ESD protection, but the level of
protection may be exceeded by extremely high voltage.

PAGE 14
Warranty
IMI instrumentation is warranted against defective material workmanship for 1 year unless otherwise expressly
specified. Damage to instruments caused by incorrect power or misapplication, is not covered by warranty. If
there are any questions regarding power, intended application, or general usage, please consult with your local
sales contact or distributor. Batteries or expendable hardware items are not covered by warranty.
Service
Because of the sophisticated nature of IMI instrumentation, field repair is typically NOT recommended and may
void any warranty. If factory service is required, return the instrumentation according to the “Return Procedure”
stated below. A repair and/or replacement quotation will be provided prior to servicing at no charge. Before
returning the unit, please consult a factory IMI applications engineer concerning the situation as certain problems
can often be corrected with simple on-site procedures.
Return procedure
To expedite returned instrumentation, contact a factory IMI applications engineer for RETURN MATERIAL
AUTHORIZATION (RMA) NUMBER. Please have information available such as model and serial number. Also,
to insure efficient service, provide a written description of the symptoms and problems with the equipment to a
local sales representative or distributor, or contact IMI if none are located in your area.
Customers outside the U.S. should consult their local IMI distributor for information on returning equipment. For
exceptions, please contact that International Sales department at IMI to request shipping instructions and an
RMA. For assistance, please call [phone], or fax us at [phone]. You may also receive assistance
via e-mail at [e-mail] or visit our website at www.pcb.com.
Customer Service
IMI, a division of PCB Piezotronics, guarantees Total Customer Satisfaction. If, at any time, for any reason, you
are not completely satisfied with any IMI product, IMI will repair, replace or exchange it at no charge. You may
also choose to have your purchase price refunded.
IMI offers to all customers, at no charge, 24-hour phone support. This service makes product or application
support available to our customers, day or night, seven days a week. When unforeseen problems or emergency
situations arise, call the IMI Hot Line at [phone], and an application specialist will assist you.

Model Number
646B01 4-20 MA OUTPUT ACCELEROMETER Revision: B
ECN #: 50453
Performance EN G L ISH SI
Measurement Range 0.0 to 10 g rms 0.0 to 98.1 m/s² rms [1]
Output 4-20 mA 4-20 mA
Frequency Range(± 10 %) 180 to 300 kcpm 3 to 5 kHz [2][3]
Broadband Resolution 0.05 g rms 0.49 m/s² rms [4]
Non-Linearity ± 1 % ± 1 %
Environmental
Temperature Range -40 to 185 °F -40 to 85 °C
Enclosure Rating IP68 IP68
Electrical
Excitation Voltage 12 to 30 VDC 12 to 30 VDC
Load Resistance 50(Vs-12) Ohm 50(Vs-12) Ohm
Settling Time(within 2% of value) < 15 sec < 15 sec
Electrical Isolation(Case) > 108 Ohm > 108 Ohm
Ph ysical
Size (Hex x Height) 1.0 in x 2.6 in 25.4 mm x 66 mm
Weight 4.7 oz 131 gm
Mounting Thread 1/4-28 UNF No Metric Equivalent
Mounting Torque 3 to 5 ft-lb 4 to 7 Nm
Sensing Element Ceramic Ceramic
Sensing Geometry Shear Shear
Housing Material Stainless Steel Stainless Steel
Sealing Welded Hermetic Welded Hermetic
Electrical Connector 2-Pin MIL-C-5015 2-Pin MIL-C-5015
Electrical Connection Position Top Top
Electrical Connections(Pin A) 4-20 mA Pos (+) 4-20 mA Pos (+)
Electrical Connections(Pin B) 4-20 mA Neg (-) 4-20 mA Neg (-)
[5]
All specifications are at room temperature unless otherwise specified.
In the interest of constant product improvement, we reserve the right to change specifications without notice.
ICP® is a registered trademark of PCB Piezotronics, Inc.
EX - Hazardous Area Approval- contact factory for
specific approvals
Hazardous Area Approval DIV II, CL I, GRPS A-D, ExnL,
AExnA, IIC T4 DIV II, CL I, GRPS A-D, ExnL, AExnA, IIC T4
Hazardous Area Approval EEx ia IIC T4, -40°C≤Ta≤80°C,
II 1 G EEx ia IIC T4, -40°C≤Ta≤80°C, II 1 G
Hazardous Area Approval EEx nL IIC T4, -40°C≤Ta≤80°C,
II 3 G EEx nL IIC T4, -40°C≤Ta≤80°C, II 3 G
Hazardous Area Approval DIV I, CL I, II, III, GRPS A-G, Exia,
AExia, IIC T4 DIV I, CL I, II, III, GRPS A-G, Exia, AExia, IIC T4
M - Metric Mount
Supplied Accessory: Model M081A61 Mounting Stud 1/4-28 to M6 X 1 (1) replaces Model 081A40
RV - Buffered Analog Signal Output - 100 mV/g
(±20%)
Electrical Connector 3-Pin MIL-C-5015 3-Pin MIL-C-5015
Electrical Connections(Pin A) 4-20 mA Pos (+) 4-20 mA Pos (+)
Electrical Connections(Pin B) 4-20 mA Neg/Signal Output
Neg 4-20 mA Neg/Signal Output Neg
Electrical Connections(Pin C) Signal Output Pos Signal Output Pos
OPTIONA L VERSION S
Optional versions have identical specifications and accessories as listed for the standard model except
where noted below. More than one option may be used.
NOTES:
[1]Conversion Factor 1g = 9.81 m/s².
[2]Current will fluctuate at frequencies below 5 Hz.
[3]1Hz = 60 cpm (cycles per minute).
[4]Typical.
[5]See PCB Declaration of Conformance PS039 or PS053 for details.
Date: 02/04/2020 Date: 02/04/2020 Date: 02/04/2020 Date: 02/04/2020 28859
Entered: LK Engineer: NJF Sales: MC Approved: NJF Spec Number:
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
3425 Walden Avenue, Depew, NY 14043
SUPPLIED A CCESSORIES:
Model 081A40 Mounting Stud (1)
Model ICS-4 NIST-traceable single-axis amplitude response calibration from 0 cpm (0 Hz) to upper
10% frequency for 4 - 20 mA output vibration sensor (1)