Recessed Mount - PCB Piezotronics ICP 109C11 Installation And Operating Manual

Residue
Existing Recessed Ports
During prolonged testing, should waveform distortion
occur, remove sensor and remove residue as shown.
It is important to note that, should the seal surface
require remachining to clean up after prolonged use,
don't forge to deepen the 1/4" diameter hole by the
same amount. Otherwise, the sensor may bottom
when installed.
3.2 PREPARING NEW MOUNTING
PORTS
Refer to installation drawing provided in this manual
for instructions in mounting hole preparation. For
best results, do not deviate from the steps outlined in
this drawing.
Use good machining practice in preparation of the
mounting port, paying particular attention to the seal
surface (.323 diameter), and keeping it free from tool
chatter marks.
NOTE: It is important that this surface be perfectly
smooth and free from nicks or other discontinuities
which might cause leaks at high pressures.
3.3

RECESSED MOUNT

The recessed installation is shown in figure below.
Drawing Number: 21113
Revision: NR
OPERATION MANUAL FOR

ICP HIGH PRESSURE SENSORS
Models 109A, A02, A11, A12
Models 109B11, B12
Model 040A Reamer
This type of mounting protects the sensor diaphragm
from the effects of high-flash temperatures and
particle impingement due to blast effects, thereby
prolonging sensor life.
The recommended range of passage diameters is .090
to .125 diameter.
The limitation in this type of installation lies in the
frequency-limiting effects of the passage due to its
length.
The passage behaves like an underdamped second
order system, the resonant
determined by the passage length. This can have a
limiting effect of pressure pulse rise time while
causing passage ringing in cases where the passage is
too long.
Recessed Mount
.010
min.
The following relationship determines this resonant
frequency (f ):
r
V

f (Hz)
(EQ. 1)
r
4 L
Where: f = Resonant frequency of passage (Hz)
r
V = Velocity of sound in air (ft/sec)
L = Length of column (ft)
2
frequency being