BALLISTICS PRESSURE TRANSDUCER MODELS 165B02 AND 118A07 OPERATION MANUAL
1
1.0
INTRODUCTION
The Model 165B02 & 118A07 are, charge mode
ballistics transducers with welded diaphragm and a
rugged quartz element of proven reliability ideally suited
for shotgun shells. The transducer’s welded diaphragm
provides better transient thermal characteristics,
important for ballistics applications. The rugged
piezoelectric element utilizes synthetic quartz crystals to
convert instantaneous pressure changes to an analogous
electrostatic charge. Chamber pressure is sensed by the
transducer as the round is fired.
The transducer also serves as a replacement for other
diaphragm-type gauges. In addition to ballistics testing,
the Model 165B02 & 118A07 can be used for hydraulic
and pneumatic test applications.
2.0
DESCRIPTION
Figure 2.1 shows the external configuration of the Model
165B02. The unit is housed in a lightweight stainless
steel case and has a stainless steel diaphragm. It
comfortably tolerates ambient temperatures ranging
from -400 to +400 °F (-240 to +204 °C).
The 3/8-24 thread and flush diaphragm design are
conventional, providing direct interchangeability with
existing machined diaphragm-type piezoelectric
transducers. The short, rigid quartz element and stiff
diaphragm give the unit a 250 kHz natural frequency and
good linearity, even below 1 000 psi.
3.0
INSTALLATION
When choosing an installation method, the advantages
and disadvantages of each method must be carefully
weighed. Characteristics like location, ruggedness,
amplitude range, accessibility, temperature and
portability may be greatly affected by the installation
configuration and technique. Often, the most important
and overlooked consideration is the affect the mounting
technique has on the high-frequency operating range of
the pressure sensor.
Two basic mounting techniques are recommended for
pressure sensors: the recess mount and the flush mount.
The technique used is determined by the specifics of the
individual application. See the Installation Drawing in
this manual for additional details on the individual
sensor series.
A torque wrench should be used to ensure specified
mounting torque when installing the unit. Refer to the
Installation Drawing, located in the Appendix, for the
recommended torque value.
It is wise to replace the seal each time the transducer is
installed. One is supplied with the sensor; replacements
are available as regular stock items.
3.1
Mounting in Existing Recessed Ports
The Model 165B02 & 118A07 mounts directly in
existing ports machined for PCB Models 165A02,
167A, 167A02, 167A11, 167A12, and others.
Drawing Number: 21109
Revision: NR
