PCB Piezotronics ICP 105C12 Installation And Operating Manual page 6

The natural frequency and approximate fastest
pressure step rise time for various length passages is
shown in the following chart. (Medium, air at 25C).
PASSAGE PASSAGE
LENGTH (in.) RESONANCE
(kHz)
.050 66
.100 33
.200 16.5
.50 6.6
1.0 3.3
Passage Resonance vs. Passage Length
Actual resonant frequencies measured in practice may
differ slightly from the chart values due to variations
in the velocity of propagation of sound caused by
changes in temperature and pressure of the medium in
the passage.
For best matching of passage to diaphragm, maintain
the .010" clearance ahead of the diaphragm as shown
in Typical Recessed Installation figure.
4.0 OPERATION
Connect sensor to signal conditioner as shown below,
depending upon sensor style being used.
Signal Conditioner
Solder Terminal
105A
2-Wire Cable
070A09 Solder
Connector Adaptor
Typical Circuit Connection (For 105A)
Drawing Number: 21106
Revision: NR
OPERATION MANUAL FOR
MINIATURE ICP
105A AND 105C SERIES
APPROX.
FASTEST
PULSE RISE
TIME (u Sec)
5
10
20
50
100
Model 480A
Scope
XDCR
To Readout

PRESSURE SENSOR
002A Cable
XDCR
Typical Circuit Connection (For 105C02,C03,
C12, C13, C22, C23, C33, C43)
NOTE: All PCB signal conditioners for ICP
contain current-limiting circuitry to set the input
current in the range of 2 to 20 mA.
Do not connect a power supply to these units without
current limiting. To do so will destroy the built-in IC
amplifier.
All PCB signal conditioners feature fault-monitoring
voltmeters on the front panel.
operation, the meter will indicate about mid-scale
(+11 volts). If one of the connections to the sensor is
open, the meter will read full scale (yellow area).
Should a short occur on the sensor line, the meter will
read 0 volts (red area).
5.0 CALIBRATION
Because of the relatively short discharge time
constant of this series, static calibration means cannot
be used. Fast dynamic means such as step function or
pulse generators must be used instead.
Contact the factory for help in solving specific
calibration problems.
6.0 MAINTENANCE
The small size and sealed construction of these
sensors precludes field maintenance and repair.
Should a problem develop, contact the factory for
assistance.
Model 480A
Signal Conditioner
XDCR Scope
To Readout

sensor
During normal
3