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Model 117B25
CONFORMAL BALLISTICS PRESSURE SENSOR
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: 716-684-0987
E-mail: info@pcb.com
Web: www.pcb.com
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Summary of Contents for PCB Piezotronics 117B25
- Page 1 Model 117B25 CONFORMAL BALLISTICS PRESSURE SENSOR 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: 716-684-0987 E-mail: info@pcb.com Web: www.pcb.com...
- Page 2 Returning Equipment – Following the equipment to PCB Piezotronics for these procedures will insure that your repair. User servicing or repair is not returned materials are handled in the recommended and, if attempted, may most expedient manner.
- Page 3 PCB Piezotronics, Inc. Warranty – All equipment and repair 3425 Walden Ave. services provided by PCB Piezotronics, Depew, NY 14043 USA Inc. are covered by a limited warranty Toll-free: (800) 828-8840 against defective...
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Page 4: Installing The Sensor
OPERATION MANUAL FOR CONFORMAL BALLISTICS PRESSURE SENSOR Series 117B Once the proper thickness spacer is found, removal INTRODUCTION and re-installation now becomes a routine matter. The Model 117B Conformal Sensor measures INSTALLATION pressure inside metallic cartridges and paper or plastic shotshell, during firing of the round, without drilled holes in the round. - Page 5 OPERATION MANUAL FOR CONFORMAL BALLISTICS PRESSURE SENSOR Series 117B the curvature. In these latter cases, the Once the proper thickness is found for sensor forward side is identified with the perfect flushness, the sensor may be legend “FWD” etched on the guide collar to removed and reinstalled using this same which the slotted clamp is attached.
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Page 6: Maintenance
OPERATION MANUAL FOR CONFORMAL BALLISTICS PRESSURE SENSOR Series 117B LOW-END NONLINEARITY It will be noticed during calibration, especially with metallic cartridges, that a certain amount of pressure is necessary before linear output is attained from the conformal sensor. This is due to the fact that since the cartridge cases are made nominally smaller in diameter than the chamber to allow easy insertion and extraction, the case must be expanded slightly by the internal... - Page 7 OPERATION MANUAL FOR CONFORMAL BALLISTICS PRESSURE SENSOR Series 117B Drawing Number: 21086 Revision: NR...
- Page 8 OPERATION MANUAL FOR CONFORMAL BALLISTICS PRESSURE SENSOR Series 117B Drawing Number: 21086 Revision: NR...
- Page 9 AN IMPROVED TECHNIQUE FOR UTILIZATION OF CONFORMAL BALLISTICS SENSOR CALIBRATION DATA The PCB Series 117B Conformal Ballistics Sensor (patented) measures chamber pressure in a novel manner. The sensitive surface of the sensor, when properly installed in the gun chamber, conforms or blends in precisely with the inside surface of the chamber actually forming a portion of the wall adjacent to the cartridge case.
- Page 10 AN IMPROVED TECHNIQUE FOR UTILIZATION OF CONFORMAL BALLISTICS SENSOR CALIBRATION DATA output Sensitivit (Eq. 1) input The units for sensitivity are commonly pC/psi or mV/psi. Note that in this case, the sensitivity is identical to the slope of the line, since the line does intersect the origin by previous definition.
- Page 11 AN IMPROVED TECHNIQUE FOR UTILIZATION OF CONFORMAL BALLISTICS SENSOR CALIBRATION DATA At the lower pressures, the sensor has very little output (Eq. 4) because there is a certain amount of clearance between the cartridge case and the chamber wall. Obturation of the cartridge occurs in this region.
- Page 12 AN IMPROVED TECHNIQUE FOR UTILIZATION OF CONFORMAL BALLISTICS SENSOR CALIBRATION DATA The straight line is the best line that can be constructed Set range of charge amplifier output to 1000 pC/volt (or through the linear portion of the curve as shown in other desired range).
- Page 13 AN IMPROVED TECHNIQUE FOR UTILIZATION OF CONFORMAL BALLISTICS SENSOR CALIBRATION DATA Dial Gain Standardization The indicated peak pressure P2 from the conformal, which through scale factoring can be read to read Many charge amplifiers feature a calibrated gain pot for directly in psi (on a digital peak meter for example) is dialing in sensor sensitivity for the purpose of setting simply added to the offset pressure to arrive at true peak...
- Page 14 AN IMPROVED TECHNIQUE FOR UTILIZATION OF CONFORMAL BALLISTICS SENSOR CALIBRATION DATA Calibrate Signal Insertion Another method that is useful especially when utilizing a storage oscilloscope readout is to use a charge calibrator to inject a full scale charge signal into the charge amplifier.
- Page 15 AN IMPROVED TECHNIQUE FOR UTILIZATION OF CONFORMAL BALLISTICS SENSOR CALIBRATION DATA * Adds offset pressure (not available from PCB). Drawing Number: 21210 Revision: NR...
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