PCB Piezotronics EX619A11 User manual

Model EX619A11
Charge Output Accelerometer
Installation and Operating Manual
For assistance with the operation of this product,
contact PCB Piezotronics, Inc.
Toll-free: 800-828-8840
24-hour SensorLine: 716-684-0001
Fax: [phone]
E-mail: [email protected]
Web: www.pcb.com

The information contained in this document supersedes all similar information that
may be found elsewhere in this manual.
Total Customer Satisfaction –PCB
Piezotronics guarantees Total Customer
Satisfaction. If, at any time, for any
reason, you are not completely satisfied
with any PCB product, PCB will repair,
replace, or exchange it at no charge.
You may also choose to have your
purchase price refunded in lieu of the
repair, replacement, or exchange of the
product.
Service –Due to the sophisticated
nature of the sensors and associated
instrumentation provided by PCB
Piezotronics, user servicing or repair is
not recommended and, if attempted,
may void the factory warranty. Routine
maintenance, such as the cleaning of
electrical connectors, housings, and
mounting surfaces with solutions and
techniques that will not harm the
physical material of construction, is
acceptable. Caution should be observed
to insure that liquids are not permitted to
migrate into devices that are not
hermetically sealed. Such devices
should only be wiped with a dampened
cloth and never submerged or have
liquids poured upon them.
Repair –In the event that equipment
becomes damaged or ceases to
operate, arrangements should be made
to return the equipment to PCB
Piezotronics for repair. User servicing or
repair is not recommended and, if
attempted, may void the factory
warranty.
Calibration –Routine calibration of
sensors and associated instrumentation
is recommended as this helps build
confidence in measurement accuracy
and acquired data. Equipment
calibration cycles are typically
established by the users own quality
regimen. When in doubt about a
calibration cycle, a good “rule of thumb”
is to recalibrate on an annual basis. It is
also good practice to recalibrate after
exposure to any severe temperature
extreme, shock, load, or other
environmental influence, or prior to any
critical test.
PCB Piezotronics maintains an ISO-
9001 certified metrology laboratory and
offers calibration services, which are
accredited by A2LA to ISO/IEC 17025,
with full traceability to SI through
N.I.S.T. In addition to the normally
supplied calibration, special testing is
also available, such as: sensitivity at
elevated or cryogenic temperatures,
phase response, extended high or low
frequency response, extended range,
leak testing, hydrostatic pressure
testing, and others. For information on
standard recalibration services or
special testing, contact your local PCB
Piezotronics distributor, sales
representative, or factory customer
service representative.
Returning Equipment –Following
these procedures will insure that your
returned materials are handled in the
most expedient manner. Before
Warranty, Service, Repair, and
Return Policies and Instructions

returning any equipment to PCB
Piezotronics, contact your local
distributor, sales representative, or
factory customer service representative
to obtain a Return Warranty, Service,
Repair, and Return Policies and
Instructions Materials Authorization
(RMA) Number. This RMA number
should be clearly marked on the outside
of all package(s) and on the packing
list(s) accompanying the shipment. A
detailed account of the nature of the
problem(s) being experienced with the
equipment should also be included
inside the package(s) containing any
returned materials.
A Purchase Order, included with the
returned materials, will expedite the
turn-around of serviced equipment. It is
recommended to include authorization
on the Purchase Order for PCB to
proceed with any repairs, as long as
they do not exceed 50% of the
replacement cost of the returned
item(s). PCB will provide a price
quotation or replacement
recommendation for any item whose
repair costs would exceed 50% of
replacement cost, or any item that is not
economically feasible to repair. For
routine calibration services, the
Purchase Order should include
authorization to proceed and return at
current pricing, which can be obtained
from a factory customer service
representative.
Warranty –All equipment and repair
services provided by PCB Piezotronics,
Inc. are covered by a limited warranty
against defective material and
workmanship for a period of one year
from date of original purchase. Contact
PCB for a complete statement of our
warranty. Expendable items, such as
batteries and mounting hardware, are
not covered by warranty. Mechanical
damage to equipment due to improper
use is not covered by warranty.
Electronic circuitry failure caused by the
introduction of unregulated or improper
excitation power or electrostatic
discharge is not covered by warranty.
Contact Information –International
customers should direct all inquiries to
their local distributor or sales office. A
complete list of distributors and offices
can be found at www.pcb.com.
Customers within the United States may
contact their local sales representative
or a factory customer service
representative. A complete list of sales
representatives can be found at
www.pcb.com. Toll-free telephone
numbers for a factory customer service
representative, in the division
responsible for this product, can be
found on the title page at the front of this
manual. Our ship to address and
general contact numbers are:
PCB Piezotronics, Inc.
3425 Walden Ave.
Depew, NY14043 USA
Toll-free: [phone]
24-hour SensorLineSM: [phone]
Website: www.pcb.com
E-mail: [email protected]

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

DOCUMENT NUMBER: 21354
DOCUMENT REVISION: C
ECN: 45605
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.

1
General
OPERATING GUIDE
for use with
PIEZOELECTRIC CHARGE MODE ACCELEROMETERS
SPECIFICATION SHEET, INSTALLATION DRAWING
AND CALIBRATION INFORMATION ENCLOSED
PCB ASSUMES NO RESPONSIBILITY FOR DAMAGE CAUSED TO THIS PRODUCT AS A RESULT OF
PROCEDURES THAT ARE INCONSISTENT WITH THIS OPERATING GUIDE.
DOC: 55308
REV: NR
ECO:41036

2
TABLE OF CONTENTS
OPERATING GUIDE........................................................................................................................................................... 1
PIEZOELECTRIC CHARGE MODE ACCELEROMETERS ............................................................................................. 1
1.1 Cables in Explosive Atmospheres........................................................................................................................... 3
1.2 High Temperature Differential Charge Output Sensor............................................................................................ 3
2CABLING ..................................................................................................................................................................... 3
2.1 General Precautions and Considerations................................................................................................................. 3
2.1.1 Proper Cable Type and Care.......................................................................................................................... 3
2.2 Softline Cable.......................................................................................................................................................... 4
2.3 Integraral Hardline Cable........................................................................................................................................ 4
2.4 Hardline Connection Type ...................................................................................................................................... 4
2.4.1 PCB / Lemo type connector........................................................................................................................... 4
2.4.2 High Temperature 2 –pin 7/16-27 UNS connector........................................................................................ 4
2.5 In Line Differential Charge Amplifier..................................................................................................................... 4
3INSTALLATION OVERVIEW.................................................................................................................................... 5
3.1 Equipment Inspection.............................................................................................................................................. 5
3.2 Polarity Test............................................................................................................................................................ 5
3.3 Sensor Location....................................................................................................................................................... 5
3.4 Mounting Sensor ..................................................................................................................................................... 5
3.5 Route Mineral Insulated Hardline Cable................................................................................................................. 6
3.5.1 Care................................................................................................................................................................ 6
3.5.2 Bend Radius................................................................................................................................................... 7
3.5.3 Clamp Cable .................................................................................................................................................. 7
4POWERING.................................................................................................................................................................. 8
4.1 Installation............................................................................................................................................................... 8
4.2 Operation................................................................................................................................................................. 8
5HIGH-TEMPERATURE OPERATION ...................................................................................................................... 9
5.1 Introduction............................................................................................................................................................. 9
5.2 Reduced Resistance at Charge Amplifier Input....................................................................................................... 9
5.3 Solution to Reduced Resistance ............................................................................................................................ 10
5.4 Low-Frequency Response Limitations .................................................................................................................. 10
5.5 Other Precautions.................................................................................................................................................. 12
6ACCELEROMETER CALIBRATION....................................................................................................................... 12
6.1.1 SENSOR RECALIBRATION..................................................................................................................... 12
6.1.2 BACK-TO-BACK CALIBRATION THEORY .......................................................................................... 13
6.1.3 PCB CALIBRATION PROCEDURE ......................................................................................................... 14

3
INTRODUCTION
Congratulations on the purchase of a quality PCB charge mode accelerometer. In order to ensure the highest
level of performance for this product, it is imperative that you properly familiarize yourself with the correct
mounting and installation techniques before attempting to operate this device. If, after reading this manual, you
have any additional questions concerning this sensor or its application, feel free to call an Application Engineer
at 716-684-0001 or the closest PCB representative.
1.1 Cables in Explosive Atmospheres
The cable lengths (Integral and Cable and Cable Assemblies) INSTALLED IN AN EXPLOSIVE ATMOSPHERE IS
DEFINED IN THE ATEX, IECEx, CSA, ETC. APPROVAL CERTIFICATES.
1.2 High Temperature Differential Charge Output Sensor
Ceramic or Single crystal shear-structured accelerometers offer high performance for precision vibration
measurements in high-temperature environments. The use of ceramic or single crystal sensing crystals,
operating in the shear mode, reduces erroneous output due to base strain, thermal transients, and transverse
motion.
Charge mode accelerometers output a strong, high-impedance charge signal directly from their piezoelectric
sensing element. They do not contain built-in signal conditioning electronics; the signal is conditioned
externally by either a laboratory-style charge amplifier or in-line charge converter prior to being analyzed by a
readout or recording device. The absence of built-in electronics permits operation to elevated temperatures of
500 °F (260 °C) for most models or up to 1300 °F (700 °C) for special applications.
These accelerometers are ideal for structural testing, machine monitoring, and vehicular shock, high
temperature machinery and power generation turbine and other vibration measurement tasks where high
temperatures preclude the use of accelerometers with built-in microelectronics.
Enclosed is a Specification Sheet, which lists the complete performance characteristics of the particular
accelerometer.
2 CABLING
2.1 General Precautions and Considerations
2.1.1 Proper Cable Type and Care
Ascertain that you have ordered the correct cable type. Due to the high-impedance nature of the output signal
generated by charge mode accelerometers, several important precautionary measures must be followed.
When using soft-line cable always use special low-noise PCB Series 045 Low-Noise Cable (or equivalent) for
connecting to the input of the differential charge-output accelerometers. For extremely high temperature
charge mode applications use mineral insulated (MI) hard-line.
Care and attention to installation is essential, as the reliability and accuracy of your system is no better than
that of the output cable. Cables and connectors must be kept clean and dry to maintain high insulation
resistance and low frequency responce. In the event that the insulation resistance is compromised, inspect,
clean, and bake cables and connectors to restore insulation resistance.

4
2.2 Softline Cable
Special high temperature low-noise, shielded cable 2-wire cable assembly is required with charge mode
sensors for applications up to 500°F to connect the transducer to the charge amp. When additional
mechanical protection is required a stainless steel armor can be used.
The shield acts as a Faraday cage to reduce electrical noise from corrupting the signals, and minimizes
capacitively coupled noise from other electrical sources.
Standard, two-wire, or coaxial cable, when flexed, generates a charge between the conductors. This is referred
to as triboelectric noise and cannot be distinguished from the sensor's charge output. Low-noise cables have a
special graphite lubricant between the dielectric and the braided shield, which minimizes the triboelectric effect
and improves the quality of the sensor's charge output signal.
When using separate cables connect the cable to the accelerometer. A small amount of thread-locking
compound placed on the connector prior to attachment helps secure the cable during testing. In harsh
environments, the connection can be sealed with silicone rubber, O-rings, and flexible heat-shrink tubing.
2.3 Integral Hardline Cable
For extremely high temperature (>500°F) charge mode applications use mineral insulated (MI) hardline. Keep
cable clean to maintain insulation resistance and good low-frequency response
2.4 Hardline Connection Type
2.4.1 PCB / Lemo type connector
The Lemo connector is PCA.0S.302.CLAC42 that is specially adapted for use with hardline cable. The
connector is a self-latching system that allows the connector to be mated by simply pushing the plug axially into
the socket. When required the connector is disengage by a single axial pull on the outer release sleeve.
2.4.2 High Temperature 2 –pin 7/16-27 UNS connector
This connector is a Model GP, 2 Pin Jack, 7/16-27 thread. The connector is welded to the hardline to provide a
high temperature, hermetic connection. The GP connector uses a threaded connction to mate with a GN or ET
2-Socket plug and torqued to 5 ft*lbs +/- 1 ft*lb
2.5 In Line Differential Charge Amplifier
The differential in line charge amplifier is purchased separately
A conventional method for conditioning the high-impedance signal generated by a charge output sensor is to
use a differential 422 series in-line charge amplifiers operate from an ICP ® signal conditioner. The unit
employs a high gain amplifier to perform the impedance transformation. The charge output of the transducers
may be scaled in terms of acceleration, pressure or force. The output is then mV/g, mV/psi or mV/lb,
respectively.

5
3 INSTALLATION OVERVIEW
3.1 Equipment Inspection
Before installing the accelerometer, verify the insulation resistance (I/R) of the sensor is per specification. I/R
can be out of specification due to mishandling and/or damage.
3.2 Polarity Test
Use this test to verify the proper polarity response. Improper polarity will adversely affect the use of the sensor
for machinery diagnostics such as balancing.
Step 1 –Connect the sensor to a 422 style charge amp and any ICP ® signal conditioner. Using standard
cable, connect the powered sensor to an oscilloscope.
Step 2 –Set the time scale to 20 milliseconds/division
Step 3 –Hold the transducer in hand and tap the bottom. The wavefrom on the oscilloscope first goes positive
as shown in Figure 1. If the waveform goes negative the wiring is reversed, contact PCB for technical support.
FIGURE 1
3.3 Sensor Location
Characteristics like location, ruggedness, amplitude range, accessibility, temperature, and portability
are extremely critical.
For optimum performance and measurement find a rigid location on the machine casing that most accurately
represents the vibration of the rotor, bearing, fan, etc. to be measured.).
3.4 Mounting Sensor
Bolt mounting requires smooth, flat contact surfaces for proper operation and is recommended for permanent
and/or secure installations. Stud or bolt mounting is also recommended when testing at high frequencies.
Note: Do NOT attempt mounting on curved, rough, or uneven surfaces, as the potential for misalignment and
limited contact surface may significantly reduce the sensor’s upper operating frequency range.
STEP 1: Verify that the ambient and surface temperature of the mounting location are within the
temperature range of the sensor.