Drawing Number: 21167
Revision: NR
OPERATION MANUAL FOR
ICP
WATER-COOLED PRESSURE SENSORS
MODELS 124A21, A22, A24
1
1.0 INTRODUCTION
The series of sensors described in this guide is
designed to measure dynamic pressures in
intense thermal environments typified by rocket
engine combustion chambers.
These sensors feature acceleration-compensated
piezoelectric pressure probes, mounted in a
water-cooled adaptor and an internal signal
conditioner to provide a directly usable output
voltage.
2.0
DESCRIPTION
The Models 124A21, A22 and A24 contain
built-in impedance converter electronic circuits
which convert the high-impedance voltage from
the quartz crystal to a low-impedance voltage
signal that can be fed directly into most common
indicating or recording instruments.
The outer body of this series
is 17-4 PH
hardened stainless steel and features a ceramic-
coated tip for protection against erosion by hot
gasses when the sensor is flush-mounted directly
in combustion chambers.
NOTE: The sensor probe in this series is factory
installed at a precise depth in the outer body.
Do not attempt removal of this probe. Contact
the factory should any questions or problems
arise concerning the sensor probe.
The probes in all models are electrically ground
isolated from the outer housing.
3.0
INSTALLATION
Prepare mounting port in accordance with
instructions on installation drawing 124-1210-
90.
Inspect the mounting port for burrs and tool
marks at the seal surface.
Series 124A: Water- Cooled Rocket Motor,
ICP
®
and Charge Sensors
Use recommended mounting torque when
installing sensors. Do not overtorque as damage
to seal surface could result.
Especially in the presence of high vibration,
support water supply tubes by clamping to rigid
surfaces with adequate strain relief on loop to
avoid stressing tubes.
Either water tube may be used as the inlet tube.
Use at least a 50 psi source of clean water for
cooling.
