PCB Piezotronics 124A24 User manual

Model 124A24
Rocket motor ICP® pressure sensor, 1000 psi, 5 mV/psi, water-cooled, 1/2-
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

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.

Drawing Number: 21167
Revision: NR
OPERATION MANUAL FOR
ICPWATER-COOLED PRESSURE SENSORS
MODELS 124A21, A22, A24
1
1.0 INTRODUCTION
The series of sensors described in this guide is
designed to measure dynamic pressures in
intense thermal environments typified by rocket
engine combustion chambers.
These sensors feature acceleration-compensated
piezoelectric pressure probes, mounted in a
water-cooled adaptor and an internal signal
conditioner to provide a directly usable output
voltage.
2.0 DESCRIPTION
The Models 124A21, A22 and A24 contain
built-in impedance converter electronic circuits
which convert the high-impedance voltage from
the quartz crystal to a low-impedance voltage
signal that can be fed directly into most common
indicating or recording instruments.
The outer body of this series is 17-4 PH
hardened stainless steel and features a ceramic-
coated tip for protection against erosion by hot
gasses when the sensor is flush-mounted directly
in combustion chambers.
NOTE: The sensor probe in this series is factory
installed at a precise depth in the outer body.
Do not attempt removal of this probe. Contact
the factory should any questions or problems
arise concerning the sensor probe.
The probes in all models are electrically ground
isolated from the outer housing.
3.0 INSTALLATION
Prepare mounting port in accordance with
instructions on installation drawing 124-1210-
90.
Inspect the mounting port for burrs and tool
marks at the seal surface.
Series 124A: Water- Cooled Rocket Motor,
ICP®and Charge Sensors
Use recommended mounting torque when
installing sensors. Do not overtorque as damage
to seal surface could result.
Especially in the presence of high vibration,
support water supply tubes by clamping to rigid
surfaces with adequate strain relief on loop to
avoid stressing tubes.
Either water tube may be used as the inlet tube.
Use at least a 50 psi source of clean water for
cooling.

Drawing Number: 21167
Revision: NR
OPERATION MANUAL FOR
ICPWATER-COOLED PRESSURE SENSORS
MODELS 124A21, A22, A24
2
The Models 124A21, A22 and A24 sensors use
low output impedance probes (ICP) and will
not require the extreme insulation resistance
precaution commonly associated with charge
mode sensors.
Connect the sensor cable to the appropriate
ICPpower unit and check the front panel
monitor meter for continuity of cable
connections and internal amplifier.
Consult Guide G-0001B, "General Guide to
ICPInstrumentation" for installation and usage
hints for ICPinstruments.
4.0 OPERATION
Consult Guide G-0001B for a complete
description of the low-impedance concept in
instrumentation.
All PCB power units designed for ICPsensors
use contain built-in fault monitor meters to aid
in locating circuit faults (shorts or opens) and to
identify normal operation of the miniature
impedance converting amplifier built into the
sensor.
Do not attempt to apply voltage directly to the
input pin of the sensor from any other source.
The input current must be limited to 20 mA
maximum and the input voltage must not be
higher than 30 volts. If it is desired to build a
power unit, rather than to use one of those
available from PCB, contact the factory for
approval of this change.
The Models 124A21, 124A22 and 124A24 are
identical except for sensitivity.
The Model 124A21 has a sensitivity of 20
mV/psi which gives a full-scale range (for 5%
out) of 250 psi.
The Model 124A22 has a sensitivity of 1.0
mV/psi and a full-scale range of 5000 psi.
The Model 124A24 has a sensitivity of 5.0
mV/psi and a full-scale range of 1000 psi.
5.0 CALIBRATION
Because of the shorter time constants built into
these models, static calibration methods are
difficult to employ.
Pressures must be applied rapidly and readout
must be made with fast recording devices such
as storage oscilloscopes or similar types of data
acquisition hardware.
A pneumatic (compressed air) system with
quick opening valve and reference gage is an
excellent method of calibrating these sensors.
To take full advantage of the time constant built
into the sensor, use a DC-coupled power unit
such as the PCB Model 484B.
6.0 MAINTENANCE
The sealed construction and miniature size of
these sensors make field repair impractical.
Contact factory for assistance should problems
arise.
ICP is a registered trademark of PCB
Piezotronics