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General
Bond Stress & Temperature
Sensor
 Micron’s
Models 140820-17-4 CRES and 140821-6AL4V miniature dual measurement sensor
has been optimized for measuring rocket motor propellant bond stress and
temperature at the inside surface of the motor case wall. Keeping
the sensor very small minimizes perturbations in the normal stress
field. It’s high frequency and over-range capability provides the
option of leaving it in place to record pressure during firings to
3000 psi. (140820-17-4 CRES) and 2000 psi. (140821-6AL4V). Advise
the factory when this option is required. Calibration data to 3000
psi. will be provided.
For ease of installation into motors, the
electrical cable is a miniature flex 0.137 wide by 0.010 thick. The
free end of the flex terminates in a miniature edge circuit board
that plugs into a miniature electrical connector in the bridge
completion housing (BCH). The flex cable is pressure sealed at the
sensor end. For wound cases, cable routings can be through the case
wall or under the insulation or out the front or rear of the motor.
For motor work, normally the sensor is bonded to a
shim that fits the inside contour of the motor case. The top of the
shim provides a flat surface to mount the DBST. All of this keeps
the adhesive compliance to a minimum and optimizes the measurement
accuracy.
Thermal hysteresis is used for motor analysis and
performance testing. Long-term stability is necessary when studying
chemical aging. The above performance options are described on the
DBST price list.
Applications
- Solid Grain Rocket Motors Health
- Monitoring Bond Stress Measurements
- General Production Equipment and Controls
Robotics
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MECHANICAL |
|
Standard Pressure Ranges |
±
100 psi (G-Gage or R-Sealed Reference)
( 7.03 kg/cm2
) |
|
Over Pressure (No change in performance) |
4.0x Range |
|
Maximum Over Range Without Failure |
30x Range ( 140820 )
& 20x Range (140821) |
|
PERFORMANCE
(STRESS) |
|
Balance (Zero) Output @ STP Conditions |
0.0 ± 2.0 mV |
|
Full Scale Sensitivity |
20± 1.0 mV |
|
Static Error Band (Max) |
±
0.25% FS *BFSL (*Best Fit Straight Line) |
|
Operational Temperature Range |
-100 to 325 °F |
|
Compensated Temperature Range |
-50 to 150 °F |
|
Balance TC (Max) |
<
± 0.06 % FS / °F ( 0.04 % FS / °C ) |
|
Sensitivity TC (Max) |
<
± 0.02 % FS / °F ( 0.009 % FS / °C ) |
|
PERFORMANCE (TEMPERATURE) |
|
Output (Max) |
0 ± 4 mV at 0° F
150 ± 4 mV at 150° F
Centigrade Calibration Consult Factory |
|
ENVIRONMENTAL |
|
Storage and Operating Temperature |
-100° F to 325° F ( -73° C to +162° C ) |
|
Compensated Temperature Range |
-50° F to +150° F ( -46° C to +66° C ) |
|
Acceleration
|
100g’s Any Axis
|
|
Other Temperature Compensated Ranges |
Consult Factory
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ELECTRICAL |
|
Input (Constant Current)
|
4.0 mA |
|
Input Impedance (Nominal)
(75°F/24°C) |
500 ± 100W
|
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Output Resistance (Nominal)
(75°F/24°C) |
Stress Sensor 450 ± 50W
|
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Output Resistance (Nominal)
(75°F/24°C) |
Temperature Sensor 3000 ± 500
W |
|
Insulation Resistance Minimum |
50 MW
@ 50 VDC |
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Ordering
Guidelines |
|
 |
A. Model
Number
| 140820 – 17-4 Cress |
| 140821 - 6AL4V |
B.
Pressure Range 100 PSI
C.
PSI Options
|
G -
PSIG G = Gage |
|
R
- PSIR R = Sealed
Reference |
D. Flex
Cable
| Flex Cable Length (feet)
|
| ( 02, 05, 10 ) (Sensor
to Bridge Housing) |
E. Shielded Cable length
F.
Options
| A =
Thermal Hysteresis Data |
| B
= <1% FS/yr Long Term Stability |
| C = <0.5% FS/yr Long Term
Stability |
| D = Long Term Stability Data |
| E
= Custom applications- Call for Details |
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Example Guidelines |
 |
|
Model
140820 with a
100 PSI
R
Sealed Reference Sensor
with 2 feet of flex
cable, 2 feet of shielded cable and Options
A, C, D.
|
A |
= |
Thermal Hysteresis
Data |
|
C |
= |
<0.5% FS/yr Long
Term Stability |
|
D |
= |
Long Term
Stability Data |
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