Drawing Number: 21106
Revision: NR
OPERATION MANUAL FOR
MINIATURE ICP
PRESSURE SENSOR
105A AND 105C SERIES
1
1.0
INTRODUCTION
This model series is designed to satisfy the need for
measurement of dynamic pressures where space is
limited, such as in model testing.
The series consists of three basic mechanical
configurations or styles, each featuring a .099
”
diameter diaphragm and each with a built-in
impedance-converting
amplifier
for
simple,
convenient, two-wire, low-impedance operation.
2.0
DESCRIPTION
The Series 105A sensors utilize two quartz discs in a
thickness compression mode to produce a high-
impedance level signal which is impressed across the
input of a microminiature impedance
converter built into the sensor housing.
The signal is superimposed upon a +11 volt (nominal)
bias level at the amplifier output and is normally
decoupled from the bias voltage in the power unit.
This signal can be fed directly into most common
readout instruments such as oscilloscopes, digital
voltmeters, AC meters, peak meters, recorders, etc.
The output impedance is less than 100 ohms.
Consult guide G-0001B "General Guide to ICP
Instrumentation" for a more complete treatment of the
ICP
(Integrated Circuit Piezoelectric) principle.
3.0
INSTALLATION
Because of the miniature size of these units, extra
care should be exercised in preparation of mounting
ports and in installation of sensors into the ports.
Individual dimensional, performance and installation
drawings are included in the manual for each
particular model. Adhere carefully to instructions on
these drawings.
It is not necessary to use low-noise treated coaxial
cable as with high-impedance type sensors. PCB
Model 002A Cable is recommended.
3.1
MODEL 105A
This is the smallest of the three styles and it is
supplied in only the 100 psi range.
The Model 105A is normally mounted using Model
060A04 Clamp Nut (supplied); however, if lack of
space precludes the use of the clamp nut, the sensor
may be epoxied in place if necessary.
Do not over torque clamp nut, as to do so may distort
the body of the sensor and affect the sensitivity of the
device.
The electrical connection to this model is made by
soldering the positive (center conductor) lead from
the power unit to the .040 diameter solder terminal
provided.
(IMPORTANT! See Section 8.0, page 4)
NOTE: Do not overheat this terminal. Use a small
iron with only enough heat to obtain good solder
joint.
The electrical ground return is made to the sensor
body. This connection can be made by attaching
electrically to the structure or by using the metal
ribbon spotwelded to the sensor body.
3.2
MODELS 105C02, C12 & C22
This style utilizes a 10-32 external thread to facilitate
mounting. It is supplied in three full-scale ranges:
100, 1000 and 5000 psi.
Prepare mounting port in accordance with installation
drawing provided in manual. Do not over torque.
Use only enough torque to obtain a seal.
The electrical connection is made via a 5-44 coaxial
connector. Use coaxial 002G10 cable, 5-44 to 10-32
microdot.