PCB Piezotronics EX378B02 User manual

Model EX378B02
ICP Microphone System
Installation and Operating Manual
For assistance with the operation of this product,
contact the PCB Piezotronics, Inc.
Toll-free: 716-684-0001
24-hour SensorLine: 716-684-0001
Fax: [phone]
E-mail: [email protected]
Web: www.pcb.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.

1
PRODUCT GUIDE
377 SERIES MICROPHONES
426 SERIES PREAMPLIFIERS
Contents:
1.0 Introduction................................................................................ 1
2.0 Standards.................................................................................... 1
3.0 Setting up a Microphone Measurement System ........................ 1
4.0 Taking Measurements................................................................ 3
5.0 Accessories and Miscellaneous.................................................. 3
6.0 Maintenance............................................................................... 4
7.0 Calibration.................................................................................. 5
8.0 Warranty and Service................................................................. 5
1.0 Introduction
Thank you for your purchase of a PCB high quality microphone. These microphones offer highly accurate
and reliable acoustic measurements and are typically used in research and design applications. They are
accurate enough for laboratory usage, yet rugged enough for field-testing.
Sound within the typical 20 to 20,000 Hz audible range of a healthy human ear can either be pleasing to the
ear, as in music, or unpleasant (or harmful), as in noise. As a result, many applications, from the develop-
ment of consumer products to research in acoustics, measure sound, even sound outside the range of human
hearing. The instrument typically used to measure sound is the microphone, which is designed, like the
human ear, to transform pressure oscillations into a corresponding voltage oscillation.
2.0 Standards
Before selecting an acoustical instrument, it is important to identify which acoustical standards are appro-
priate for the application in which the instrument will be used. Whether for legal purposes or for quality
assurance programs, these standards will help determine the required quality, accuracy and consistency of
the instrument. Standards that correspond to the performance requirements, dimensions and characteristics
of acoustical components are established for microphones, sound level meters, calibrators, or other related
components. The most common organizations producing these standards are the American National Stand-
ards Institute (ANSI) and the International Electrotechnical Commission (IEC). IEC 1094-4 establishes
specifications for the mechanical dimensions and certain electroacoustic characteristics for standard indus-
trial microphones. The performance specification sheet supplied with each PCB microphone identifies the
standards to which the microphone is compliant.
3.0 Setting up a Microphone Measurement System
After the proper microphone has been selected, the corresponding preamplifier, cabling, power supplies,
signal conditioning and data acquisition selections are ready to be installed. Not all of these components
are required for all test set-ups. The figures below show typical set-ups for externally polarized and pre-
polarized microphone systems.
A prepolarized microphone can be used with a standard Microphone Power Supply designed for externally
polarized microphones, and its preamplifier, provided the supply voltage is set to zero.

2
Phantom powered microphone systems use a 3 pin XLR connector. A phantom powered microphone sys-
tem should use a 48V phantom power supply or signal conditioner for optimum performance; however
these microphone systems may be powered with a 24V or a 12V phantom power supply, but this will limit
the maximum output voltage.
Externally Polarized Microphone System
Prepolarized Microphone System
Phantom Powered Microphone System
The phantom powered preamp may be used with either a ¼’’ or a ½’’ microphone cartridge by using the
adapter provided. All IEC 61094-4 compliant microphones can be used with the phantom powered preamp.
Adapters for Phantom Powered Preamp

3
4.0 Taking Measurements
The following formula is used to calculate the pressure measured by the microphone from the output voltage
signal. The sensitivity of a microphone is typically measured at 250 Hz.
Pressure (Pa) = Voltage (mV) / Sensitivity (mV/Pa).
The lowest amplitude a healthy human ear can detect is 20 millionths of a Pascal (20Pa). Another scale
more commonly used to describe sound pressure level is the decibel (dB). To convert the output voltage
signal (measured in Vrms) to sound pressure level (measured in decibels), use the following formula:
dB
PS
V
SPL
ref
rms 















Log20
where S is the sensitivity of the microphone in mV/Pa, and Pref is the reference pressure in air, which is 20
x 10-6 Pa. The decibel scale is logarithmic and more closely matches the response reactions of the human
ear to the pressure fluctuations. Some examples of typical sound pressure levels are shown in the table
below.
dB
Pressure
Example
0
0.00002 Pa
Threshold of Hearing
60
0.02 Pa
Business Office
80
0.2 Pa
Shop Noise
94
1 Pa
Large Truck
100
2 Pa
Jackhammer
120
20 Pa
Airplane Take-Off
140
200 Pa
Threshold of Pain
At very high-pressure amplitudes, the microphone’s diaphragm will start to distort the measured sound
pressure. The maximum rated sound pressure level of a microphone is expressed as the amplitude at which
the Total Harmonic Distortion (THD) reaches a specified amount, typically 3% THD. It is important to note
that the highest sound pressure level that can be measured with a microphone system may be limited by
other parts of the system, such as the preamplifier, signal conditioner, or instrumentation. Conversely, the
Cartridge Thermal Noise (CTN) specification provides the lowest measurable sound pressure level that can
be detected above the electrical noise inherent within the microphone.
Temperature and pressure will affect the sensitivity of a microphone but these effects can be accounted for
by adjusting the recorded microphone values using the coefficients specified for each microphone model.
Simply calculate the difference in temperature and ambient pressure from those recorded during calibration
and multiply this value by the proper coefficient to determine the sensitivity offset. In most cases, the offset
will be very small and is therefore unnecessary.
5.0 Accessories & Miscellaneous
Transducer Electronics Data Sheet (TEDS)
Preamplifiers can incorporate TEDS devices, which have a built in read/write memory that contains relevant
information about the sensor and its use. Information includes manufacturer name, model number, serial
number, sensitivity, etc. The operation of TEDS devices is defined by IEEE P1451.4. A TEDS microphone
system includes a microphone mated with a preamplifier that contains the TEDS memory programmed with
both the microphone and preamplifier information. This is particularly helpful when using large channel
count systems and array set-up.
A-Weight Inline Filter
The inline filter is used in conjunction with an ICP®preamplifier to provide A-weighting for acoustical
measurements. The filter’s frequency response is weighted according to the A-weighting filter portion of
both ANSI S1.4 and IEC 60651 Type 1 Sound Level Meter Standards. ICP®signal conditioners of 4 mA
or greater are recommended when using inline filters.

4
Windscreens and Nose cones
Wind induced noise can be reduced by using a windscreen. This can offer some protection against dust
particles and mechanical damage. In the presence of high-speed airflow from a well-defined direction, such
as wind tunnels, a nose cone is recommended. When using windscreens and noise cones, the frequency
response of the microphone will be attenuated at higher frequencies.
Clamps and stands
When holding a microphone in place, it is important to minimize the influence of the stand on the sound
being measured. This can be accomplished by using low profile stands and clamps available from PCB.
Cables and Electronics
PCB carries LEMOcables as well as coaxial cables with BNC and 10-32 connectors. Traditional exter-
nally polarized microphone power supplies along with a variety of ICP®signal conditioners are available
that will fit almost any need.
6.0 Maintenance
Microphones are very stable over long periods of time, provided they are handled and stored properly. The
microphone contains fragile components that can be damaged by misuse, in particular the diaphragm, which
is made up of a very thin proprietary material and should be kept clean of dust, dirt, moisture and free any
type of imperfection (scratch, dent, etc.).
The microphone’s grid cap is designed to let the true sound pressure level through to the diaphragm while
preventing items from coming in contact with it. We do not recommend that you ever remove the grid cap
or clean the microphone. If you take the precautionary measures to keep the microphone clean and dry, it
should not be necessary. Should you need to remove the grid cap to replace it with PCB’s enhanced rugged
grid cap (shown below, and as an independent part of a rugged kit) to extend the lifespan of the precision
measuring device, caution should be taken to ensure the delicate diaphragm sensing element remains un-
touched and safe.
Use of accessories, like windscreens, and desiccants will help keep moisture off the microphone and main-
tain the specified sensitivity level. Nose cones will help keep turbulence off the microphone diaphragm and
allow the sound pressure to be measured with greater accuracy.
Keep the microphone and preamplifier assembled while preparing for testing. Keep the rubber maintenance
caps on the preamplifier’s electrical connector only. Do not place these rubber caps over the microphone.
This will create a vacuum and undo pressure on the microphone diaphragm, which can stretch the dia-
phragm and cause a change in sensitivity. Store the microphones and preamplifiers in their protective cases
when not in use.
Dust, rain, oil, moisture or exposure to extreme temperatures may adversely affect the microphone and
preamplifier’s performance. If the microphone or the inside of the connection area of the preamplifier be-
comes contaminated, use a light pressure rubber bulb to gently blow clean, dry air onto the unit in order to
remove the dust. In the event that you absolutely must take off the grid cap and clean the microphone
diaphragm, we recommend using a blow bulb or a light pressure, clean and dry air hose to gently blow
contamination off the diaphragm. The direction of the air should be parallel with the diaphragm, not directly
(0 degree incidence) pointed at the diaphragm. Do not touch the microphone’s diaphragm with your fingers
or let it come in contact with any sharp or pointed object. Please note that any contact to the microphone’s
diaphragm can negatively impact the sensitivity and long term stability of the microphone.

5
If the microphone is ever dropped (the effects of this can be minimized by PCB’s rugged grid cap or utilizing
rugged microphone kits), or comes into contact with any contamination, or is exposed to extreme tempera-
tures, immediate recalibration of the microphone should be performed. When using a rugged grid cap, a
handheld calibrator with a 1” diameter (example CAL250, or pistonphone) is required for recalibration,
along with the larger (079A59) calibration adapter. Please note that heat from your hands can affect the
calibration results. It is always good practice to wait a minimum of 30 seconds after placing the microphone
on a test system before taking a calibration reading in order to minimize the effect that heat from your hands
has on the calibration. Changes in the environmental conditions: temperature, humidity or atmospheric
pressure, may cause a change in your microphones sensitivity and thus, changes in your output accuracy. It
is always recommended to calibrate both before and after your test, within the test environment. Performing
a single point handheld calibrator check, both before and after your test, ensures reliability of the test data.
With proper maintenance, the microphone and preamplifier should provide stable and accurate results for
years to come.
7.0 Calibration
PCB offers recalibration services for our precision microphones, as well as units produced by other A2LA
manufacturers. Our internal metrology laboratory is certified to ISO 9001, accredited by A2LA to
ANSI/IEC 17025 and ANSI/NCSL Z540-1, complies with ISO 10012-1 (and former MIL-STD-45662A),
and uses equipment directly traceable to one or more of the following National Labs (NIST, PTB or DFM).
Our investment in equipment, traceability and conformance to industry standards ensures accurate calibra-
tion against relevant specifications. We also carry a line of acoustic calibrators that can be used to calibrate
microphone sensitivity on site as needed.
Hand calibration of sensitivity for most prepolarized microphones may be performed with a Larson Davis
CAL250 or CAL200 (or equivalent). The CAL250 produces 114 dB SPL at 251.2 Hz. The CAL 200
produces either 94 dB or 114 dB (user selectable) at 1000 Hz. Note that both the CAL250 and CAL 200
are compliant with ANSI S1.40-2006, Specifications and Verification Procedures for Sound Calibrators,
Class1 and IEC 60942-2003, Class 1, Sound Calibrators.
8.0 Warranty and Service
All equipment and repair services provided by PCB Piezotronics, Inc. are covered by a warranty against
defective material and workmanship under a Total Customer Satisfaction policy. 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. See the supplemental sheet, con-
tained with this manual, for information on our service, repair and return policies, procedures and instruc-
tions. When unexpected problems arise, call our 24-Hour SensorLineSM (716-684-0001) to speak with an
Application Engineer. Visit www.pcb.com for a complete statement of our warranty.
3425 Walden Avenue, Depew, NY 14043-2495 24-hour SensorLineSM: 716-684-0001
E-Mail: [email protected] U.S.A. Fax: [phone]
Website: www.pcb.com Toll-free (in the U.S.A.): 800-828-8840
A PCB GROUP COMPANY ISO 9001 CERTIFIED A2LA ACCREDITED to ISO 17025
2014 PCB Group, Inc. In the interest of constant product improvement, specifications are subject to change without notice.
PCB and ICP are registered trademarks of PCB Group, Inc. Sensor Line is a service mark of PCB Group, Inc. All other trademarks
are properties of the respective owners.
Manual Number: 27042
Manual Revision: F
ECO 51020
Printed in the U.S.A.

PCB PIEZOTRONICS INC.
3425 WALDEN AVE.
DEPEW, NEW YORK 14043
3425 Walden Ave
Depew, New York 14043
N
o
65238 N
o
1of 3
Rev. NR
ECO #: 45769
INSTRUCTIONS FOR USE - EX378XYYY Microphone System Series
Model(s) EX378XYYY Series where “X” is any letter A-Z, “YYY” is up to three numbers 0-999
Markings PCB
Depew, NY
LCIE 17 ATEX 3059 X
IECEx LCIE 17.0063 X
I M1 Ex ia I
Ex ia IIC T4 Ga
Putting Into Service Powering: All ICP
®
Microphone Systems require constant current excitation for proper operation. For
this reason, use only PCB constant-current signal conditioners or other approved constant-current
sources. The power supply consists of a current-regulated, 18 to 30 VDC source. This power is
regulated by a current-limiting circuit, which provides the constant-current excitation required for
proper operation of ICP

Microphone Systems.
In general, battery-powered devices offer versatility for portable, low-noise measurements, whereas
line-powered units provide the capability for continuous monitoring. Consult the Vibration Division’s
product catalog for more information about signal conditioners.
NOTE: Under no circumstances should a voltage be supplied to an ICP

Microphone System without
a current-regulating diode or equivalent electrical circuit. This may include ohmmeters, multi-meters
and continuity testers.
Safe Use After completing the system setup, switch on the signal conditioner and allow 1 to 2 minutes for the
system to stabilize. The meter (or LED) on the signal conditioner should be reading “green.” This
indicates proper operation and you may begin taking measurements. If a faulty condition is indicated
(red or yellow reading), first check all system connections, then check the functionality of the cable
and signal conditioner. If the system still does not operate properly, consult a PCB factory
representative.
NOTE: Always operate the Microphone System within the limitations listed on the enclosed
Specification Sheet. Operating the device outside these parameters can cause temporary or
permanent damage to the Microphone System.
Assembling The EX378XYYY Series come assembled in system consisting of a Microphone and a Pre-
Amplifier. It does not require any assembly. Only mounting to low profile stands and clamps while
taking measurements.
Dismantling Other than removal from the mounting, there is no disassembly of the sensor required to take it out of
service.
Maintenance 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.
Servicing Due to the sophisticated nature of the Microphone Systems and associated instrumentation provided
by PCB Piezotronics, user servicing or repair is not recommended and, if attempted, may void the
factory warranty. However, routine calibration of Microphone Systems and associated
instrumentation is recommended as this helps build confidence in measurement accuracy and
acquired data.

PCB PIEZOTRONICS INC.
3425 WALDEN AVE.
DEPEW, NEW YORK 14043
3425 Walden Ave
Depew, New York 14043
N
o
65238 N
o
2of 3
Rev. NR
ECO #: 45769
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.
Installation Overview: The Microphone System must be mounted on low profile stands and clamps in order to be
put into service. Characteristics like location, ruggedness, amplitude range, accessibility, temperature,
and portability are extremely critical. Cabling: Care and attention to cable installation and cable
condition is essential as the reliability and accuracy of any measurement system is no better than that
of its weakest link. Due to the nature of vibration measurements, all sensor cables will ultimately
fatigue and fail. Good installation practice will extend the life of a cable, however, it is highly
recommended to keep spare cables on hand to enable continuation of the test in the event of a cable
failure.
Install Microphone system per drawing 65241.
Adjustment The EX378XYYY series come assembled in a system and no user adjustments are possible.
However, routine calibration of sensors by the manufacturer is recommended as this helps build
confidence in measurement accuracy and acquired data.
Danger Areas (for
pressure-relief devices) N/A – not a pressure relief device.
Training Instructions Industrial sensors must be installed in Hazardous Locations by trained professionals according to
EN/IEC 60079-14 requirements.
Details on Safety of
Protection Category Ex ia is “intrinsic safety”, which limits the energy of sparks and surface temperatures to safe levels
Entity Parameters and
Limits (Values) Temperature Range: -40⁰C to +80⁰C
Ui :30V, Ii :100mA, Pi : 750mW, Ci: 0, Li: 0.36µH
Special Conditions of
Use Version Ex ia : The apparatus must only be connected to a certified associated intrinsically safe equipment. This
combination must be compatible regarding intrinsic safety rules (see electrical parameters). The
apparatus shall be connected according to drawing 65241.
The mounting of the apparatus into an installation must be carried out in such a way that sensor
metallic body and cable shield are reliably connected to the system earth.
For final installation, the user shall take all necessary precautions to maintain the minimum degree
of protection IP20 of the sensor connection when connected according to the requirements of
EN 60079-14 and IEC 60079-14 standards.
Essential
Characteristics of tools
fitted to the system (if
any).
N/A – No tools are fitted to the system.
Drawings and
Diagrams 65666,65673
Other

PCB PIEZOTRONICS INC.
3425 WALDEN AVE.
DEPEW, NEW YORK 14043
3425 Walden Ave
Depew, New York 14043
N
o
65238 N
o
3of 3
Rev. NR
ECO #: 45769
Note: Literature (such as the manual or marketing materials) describing the equipment or protective system must
not contradict the instructions with regard to safety aspects.

PCB PIEZOTRONICS INC.
3425 WALDEN AVE.
DEPEW, NEW YORK 14043
3425 Walden Ave
Depew, New York 14043
No68249 No1of 2
Rev. NR
ECO #: 47371
INSTRUCTIONS FOR USE - EX378XYYY Microphone System Series
Model(s)
EX378XYYY Series where “X” is any letter A-Z, “YYY” is up to three numbers 0-999
Markings
PCB
Depew, NY
LCIE 17 ATEX 3059 X
Ex I M1, Ex ia I Ma
Ex II 1G, Ex ia IIC T4 Ga
IECEx LCIE 17.0063X
Ex ia I Ma
Ex ia IIC T4 Ga
ETL c/us Listed Intertek 5010230
CL I, DIV 1, GR A,B,C,D
CL I, ZONE 0, AEx/Ex ia IIC T4 Ga
-40⁰C ≤ Tamb ≤+80⁰C
Putting Into Service
Powering: All ICP® Microphone Systems require constant current excitation for proper operation. For
this reason, use only PCB constant-current signal conditioners or other approved constant-current
sources. The power supply consists of a current-regulated, 18 to 30 VDC source. This power is
regulated by a current-limiting circuit, which provides the constant-current excitation required for
proper operation of ICPMicrophone Systems.
In general, battery-powered devices offer versatility for portable, low-noise measurements, whereas
line-powered units provide the capability for continuous monitoring. Consult the Vibration Division’s
product catalog for more information about signal conditioners.
NOTE: Under no circumstances should a voltage be supplied to an ICP

Microphone System without
a current-regulating diode or equivalent electrical circuit. This may include ohmmeters, multi-meters
and continuity testers.
Safe Use
After completing the system setup, switch on the signal conditioner and allow 1 to 2 minutes for the
system to stabilize. The meter (or LED) on the signal conditioner should be reading “green.” This
indicates proper operation and you may begin taking measurements. If a faulty condition is indicated
(red or yellow reading), first check all system connections, then check the functionality of the cable
and signal conditioner. If the system still does not operate properly, consult a PCB factory
representative.
NOTE: Always operate the Microphone System within the limitations listed on the enclosed
Specification Sheet. Operating the device outside these parameters can cause temporary or
permanent damage to the Microphone System.
Assembling
The EX378XYYY Series come assembled in system consisting of a Microphone and a Pre-
Amplifier. It does not require any assembly. Only mounting to low profile stands and clamps while
taking measurements.
Dismantling
Other than removal from the mounting, there is no disassembly of the sensor required to take it out of
service.
Maintenance
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.

PCB PIEZOTRONICS INC.
3425 WALDEN AVE.
DEPEW, NEW YORK 14043
3425 Walden Ave
Depew, New York 14043
No68249 No2of 2
Rev. NR
ECO #: 47371
Servicing
Due to the sophisticated nature of the Microphone Systems and associated instrumentation provided
by PCB Piezotronics, user servicing or repair is not recommended and, if attempted, may void the
factory warranty. However, routine calibration of Microphone Systems and associated
instrumentation is recommended as this helps build confidence in measurement accuracy and
acquired data.
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.
Installation
Overview: The Microphone System must be mounted on low profile stands and clamps in order to be
put into service. Characteristics like location, ruggedness, amplitude range, accessibility, temperature,
and portability are extremely critical. Cabling: Care and attention to cable installation and cable
condition is essential as the reliability and accuracy of any measurement system is no better than that
of its weakest link. Due to the nature of vibration measurements, all sensor cables will ultimately
fatigue and fail. Good installation practice will extend the life of a cable, however, it is highly
recommended to keep spare cables on hand to enable continuation of the test in the event of a cable
failure.
Install Microphone system per drawing 68216.
Adjustment
The EX378XYYY series come assembled in a system and no user adjustments are possible.
However, routine calibration of sensors by the manufacturer is recommended as this helps build
confidence in measurement accuracy and acquired data.
Danger Areas (for
pressure-relief devices)
N/A –not a pressure relief device.
Training Instructions
Industrial sensors must be installed in Hazardous Locations by trained professionals according to
EN/IEC 60079-14 requirements.
Details on Safety of
Protection Category
Ex ia is “intrinsic safety”, which limits the energy of sparks and surface temperatures to safe levels.
Entity Parameters and
Limits (Values)
Temperature Range: -40⁰C to +80⁰C
Ui: 30V, Ii:100 mA, Pi: 0.75 W, Ci: 0, Li: 0.36µH
Special Conditions of
Use
Version Ex ia :
The apparatus must only be connected to a certified associated intrinsically safe equipment. This
combination must be compatible regarding intrinsic safety rules (see electrical parameters). The
apparatus shall be connected according to drawing 68216.
Essential
Characteristics of tools
fitted to the system (if
any).
N/A –No tools are fitted to the system.
Drawings and
Diagrams
65666, 65668, 65672, 65674
Other
Conforms To UL STDS 913, 60079-0, & 60079-11 and Certified To CSA STD C22.2 # 157
Note: Literature (such as the manual or marketing materials) describing the equipment or protective system must not
contradict the instructions with regard to safety aspects.

1
1
2
2
3
3
4
4
A A
B B
THE EX378XYYY MICROPHONE SYSTEM ONLY CONSISTS OF
AN APPROVED PCB AMPLIFIER CARTRIDGE, EX426XYYY SERIES,
AND AN APPROVED MICROPHONE CARTRIDGE EX377XYYY SERIES.
THE CARTRIDGES SHOULD NOT BE DISASSEMBLED WHEN LOCATED
IN A HAZARDOUS LOCATION
APPROVED PCB SUPPLIED AMPLIFIER CARTRIDGE EX426XYYY SERIES
APPROVED PCB SUPPLIED MICROPHONE CARTRIDGE EX377XYYY SERIES
SHIELDS TO BE EARTHED AT BARRIER ENDS.
BARRIER WILL BE MOUNTED IN AN ENCLOSURE THE SUITABILITY OF
WHICH WILL BE DETERMINED BY LOCAL AUTHORITIES.
ENTITY APPLICATION
BARRIER I.S. APPARATUS
Voc/Uo ≤VMAX / UI
Isc/Io ≤IMAX/ II
Ca/Co > CI + CCABLE
La/Lo > LI + LCABLE
Po ≤PI (CENELEC ONLY)
BARRIERS WITHIN THE SPECIFIED LIMITATIONS ARE PERMITTED
ENTITY PARAMETERS EX378XYYY SERIES
Ui = 30V
Ii = 100mA
Pi = 0.75W
Ci = 0
Li = 0.36uH
CERTIFIED BY THE APPROPRIATE APPROVAL AUTHORITY FOR CONNECTION
TO THE FOLLOWING AREAS:
CLASS 1
ZONE 0
Ex ia IIC T4 Ga
AEx ia IIC T4 Ga
CLASS 1, DIV 1, GROUPS A,B,C,D CODE
IDENT. NO.
52681
DWG. NO.
SCALE: SHEET
DRAWN CHECKED ENGINEER
TITLE
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
DECIMALS X .05
XX .01
XXX .005
ANGLES ± 2 DEGREES
FILLETS AND RADII .003 - .005
HEX DIMENSIONS ARE:
≤.5 + .000 / - .003
> .5 + .000 / - .005
REMOVE ALL BURRS
SHARP = R.000 - R.003
INTERNAL THREAD DEPTH MIN.
3425 WALDEN AVE. DEPEW, NY 14043
[phone] E-MAIL: [e-mail]
68216
INTERTEK
APPROVAL
INTERCONNECTION 1 OF 1NONE
XXXX .0005
KRM 12/21/17 KRM 12/21/17 GGS 12/21/17
VIN ≤+30 VOLTS
NON-HAZARDOUS / SAFE AREA
SINGLE CHANNEL
HAZARDOUS AREA
ZONE 0
CABLE
MICROPHONE
SYSTEM
POWER
SUPPLY
RMIN
POWER
SHIELD
EX378XYYY
GND
68216
PCB Piezotronics Inc. claims proprietary rights in
the information disclosed hereon. Neither it nor any
reproduction thereof will be disclosed to others
without the written consent of PCB Piezotronics Inc.
SCHEDULE DRAWING
NO MODIFICATIONS PERMITTED
WITHOUT REFERENCE TO THE
NOTIFIED BODY
REVISIONS
REV DESCRIPTION DIN
NR INITIAL RELEASE 47371
CAUTION
ELECTROSTATIC
DISCHARGE SENSITIVE
3
2
1
2
3
16
54
6
4
5
NO CHANGES WITHOUT INTERTEK APPROVAL
CERTIFICATE ETL C/US LISTED INTERTEK 5010230
7

Model Number
EX378B02 ICP MICROPHONE SYSTEM Revision: NR
ECN #: 47683
[5]
Performanc
e
ENGLISH S
I
Nominal Microphone Diameter 1/2" 1/2"
Frequency Response Characteristic(at 0° incidence) Free-Field Free-Field
Sensitivity 50 mV/Pa 50 mV/Pa [3]
Sensitivity(± 1.5 dB) -26 dB re 1 V/Pa -26 dB re 1 V/Pa [3]
Frequency Range(± 2 dB) 3.75 to 20,000 Hz 3.75 to 20,000 Hz
Frequency Range(± 1 dB) 7 to 10,000 Hz 7 to 10,000 Hz
Lower Limiting Frequency(-3 dB) 1.0 to 3.0 Hz 1.0 to 3.0 Hz
Inherent Noise 15.5 dB(A) re 20
µPa 15.5 dB(A) re 20 µPa [2]
Dynamic Range(3% Distortion Limit) 137 dB re 20 µPa 137 dB re 20 µPa [2]
Environmental
Temperature Range(Operating) -40 to +176 °F -40 to +80 °C
Temperature Coefficient of Sensitivity(+14 to +158°F (-10 to +70°C)) 0.005 dB/°F 0.009 dB/°C [2][3]
Static Pressure Coefficient -0.013 dB/kPa -0.013 dB/kPa [2][3]
Humidity Coefficient of Sensitivity(0 to 100%, non-condensing) ± 0.001 dB/%RH ± 0.001 dB/%RH [3]
Influence of Axial Vibration(0.1g (1 m/s²)) 63 dB re 20 µPa 63 dB re 20 µPa [2]
Electrica
l
Polarization Voltage 0 V 0 V [1]
Excitation Voltage 20 to 30 VDC 20 to 30 VDC
Constant Current Excitation 2 to 20 mA 2 to 20 mA
Output Bias Voltage 10 to 14 VDC 10 to 14 VDC
Maximum Output Voltage ± 7 Vpk ± 7 Vpk
Output Impedance <50 Ohm <50 Ohm
Physica
l
Housing Material Stainless Alloy Stainless Alloy
Venting Rear Rear [4]
Electrical Connector BNC Jack BNC Jack
Mounting Thread(Grid) 0.5 - 60 UNS 0.5 - 60 UNS
Size (Diameter x Height)(with grid) 0.52 in x 4.02 in 13.2 mm x 102.1
mm
Size (Diameter x Height)(without grid) 0.50 in x 3.99 in 12.7 mm x 101.2
mm
Weight 1.87 oz 53 gm [2]
[6] 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 Group, Inc.
OPTIONAL VERSIONS
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] Prepolarized
[2] Typical
.
[3] re 250 Hz
[4] Venting through Preamp.
[5] See PCB Declaration of Conformance PS172 for details.
[6] See Model's “Instructions For Use” (IFU) for North American Conformity and Certification
Statements.
SUPPLIED ACCESSORIES:
Model ACS-63 Calibration (with TEDS) of Precision Condenser Microphones and Preamplifiers
together (mated pair).
Entered: LK Engineer: gs Sales: MV Approved: BAM Spec Number:
Date: 1/16/2018 Date: 1/16/2018 Date: 1/16/201
8
Date: 1/16/2018 66400
3425 Walden Avenue, Depew, NY 14043
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]

1
1
2
2
A A
B B
CODE
IDENT. NO.
52681
DWG. NO.
SCALE: SHEET
DRAWN CHECKED ENGINEER
TITLE
UNLESS OTHERWISE SPECIFIED TOLERANCES ARE:
DIMENSIONS IN MILLIMETERS
[ IN BRACKETS ]
ANGLES 2 DEGREES
3425 WALDEN AVE. DEPEW, NY 14043
[phone] E-MAIL: [e-mail]
DIMENSIONS IN INCHES
ANGLES 2 DEGREES
FILLETS AND RADII
.003 - .005
FILLETS AND RADII
0.07 - 0.13
OUTLINE DRAWING
66401
1 OF 1
1.5X
1/2" MICROPHONE
DECIMALS XX ±.03
XXX ±.010
DECIMALS X ± 0.8
XX ± 0.25
KRM 3/1/18 KRM 3/1/18 GGS 3/1/18
66401
PCB Piezotronics Inc. claims proprietary rights in
the information disclosed hereon. Neither it nor any
reproduction thereof will be disclosed to others
without the written consent of PCB Piezotronics Inc.
REVISIONS
REV DESCRIPTION DIN
A REMOVED HEAT SHRINK 47926
4.02 [102.1]
.52 [13.2]
.50 [12.7]
.65 [16.4]
.03 [.8]2X
MICROPHONE CARTRIDGE
PREAMPLIFIER
BNC CONNECTOR (OUTPUT)
RELATED DRAWING
NO MODIFICATIONS PERMITTED
WITHOUT THE APPROVAL OF
THE AUTHORIZED PERSON
3.07 [78.1]
3.59 [91.3]
2.32 [58.9]

1
1
2
2
3
3
4
4
A A
B B
THE EX378XYYY MICROPHONE SYSTEM ONLY CONSISTS OF
AN APPROVED PCB AMPLIFIER CARTRIDGE, EX426XYYY SERIES,
AND AN APPROVED MICROPHONE CARTRIDGE EX377XYYY SERIES.
THE CARTRIDGES SHOULD NOT BE DISASSEMBLED HEN LOCATED
IN A HAZARDOUS LOCATION
APPROVED PCB SUPPLIED AMPLIFIER CARTRIDGE EX426XYYY SERIES
APPROVED PCB SUPPLIED MICROPHONE CARTRIDGE EX377XYYY SERIES
SHIELDS TO BE EARTHED AT BARRIER ENDS.
BARRIER ILL BE MOUNTED IN AN ENCLOSURE THE SUITABILITY OF
HICH ILL BE DETERMINED BY LOCAL AUTHORITIES.
ENTITY APPLICATION
BARRIER I.S. APPARATUS
Voc/Uo ≤ V MAX / UI
Isc/Io ≤ I MAX / II
Ca/Co > CI + C CABLE
La/Lo > LI + L CABLE
Po ≤ PI (CENELEC ONLY)
BARRIERS ITHIN THE SPECIFIED LIMITATIONS ARE PERMITTED
ENTITY PARAMETERS EX378XYYY SERIES
Ui = 30V
Ii = 100mA
Pi = 0.75
Ci = 0
Li = 0.36uH
CERTIFIED BY THE APPROPRIATE APPROVAL AUTHORITY FOR CONNECTION
TO THE FOLLO ING AREAS:
ZONE 0
Ex ia IIC T4 Ga
I M1 Ex ia I
CODE
IDENT. NO.
52681
DWG. NO.
SCALE: SHEET
DRAWN CHECKED ENGINEER
TITLE
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
DECIMALS X ` .05
XX ` .01
XXX ` .005
ANGLES ± 2 DEGREES
FILLETS AND RADII .003 .005
HEX DIMENSIONS ARE:
≤ .5 + .000 / .003
> .5 + .000 / .005
REMOVE ALL BURRS
SHARP = R.000 R.003
INTERNAL THREAD DEPTH MIN.
3425 ALDEN AVE. DEPE , NY 14043
[phone] E-MAIL: [e-mail]
65241
LCIE APPROVAL
INTERCONNECTION
1 OF 1NONE
XXXX ` .0005
JDG 10/18/16 KRM 10/18/16 GGS 10/18/16
VIN ≤ +30 VOLTS
NON-HAZARDOUS / SAFE AREA
SINGLE CHANNEL
HAZARDOUS AREA
ZONE 0
CABLE
MICROPHONE
SYSTEM
PO ER
SUPPLY
RMIN
PO ER
SHIELD
EX378XYYY
GND
65241
PCB Piezotronics Inc. claims proprietary rights in
the information disclosed hereon. Neither it nor any
reproduction thereof will be disclosed to others
without the written consent of PCB Piezotronics Inc.
SCHEDULE DRAWING
NO MODIFICATIONS PERMITTED
ITHOUT REFERENCE TO THE
NOTIFIED BODY
REVISIONS
REV DESCRIPTION DIN
NR INITIAL RELEASE 45769
CAUTION
ELECTROSTATIC
DISCHARGE SENSITIVE
3
2
1
2
3
16
54
6
4
5
NO CHANGES ITHOUT LCIE APPROVAL

I ECEx Certificate
of Conformity
INTERNATIONAL ELECTROTECHNICAL COMMISSION
lEG Certification Scheme
for Explosive
Atmospheres
for rules and details of the lECEx Scheme visit www.iecex.com
Certificate No.:
lECEx LCIE 17.0063X
Issue No: 0 Certificate history:
Issue No. 0 (2017-09-22)
Status: Current
Page 1 of 3
Date of Issue:
2017-09-22
Applicant: PCB
Piezotronics
3425 Walden Avenue
Depew, New York 14043
United States
of America
Equipment: Microphone system
-
Type: Ex378XYYY
Optional accessory:
Type of Protection:
Ex ia
Marking:
Ex ia I Ma
Ex ia IIC T4 Ga
Approved for issue on behalf of the lECEx
Certification Body:
Position:
Signature:
(for printed version)
Date:
Julien GAUTHIER
Certification Officer
1.
This certificate and schedule may only be reproduced in full.
2.
This certificate is not transferable and remains the property of the issuing body.
3.
The Status and authenticity of this certificate may be verified by visiting the Official lECEx Website.
Certificate issued by:
Laboratoire Central des
Industries Eledriques (LCIE)
33 Avenue du General
Leclerc
A i l
FR-92260 Fontenay-aux-Roses
17, f4l
France