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ENDEVCO
MODEL
2221F
Piezoelectric Accelerometer
Model 2221F
• High Temperature Operation (+260°C)
• Hermetically Sealed
• 360° Cable Orientation
• Lightweight
• Aerospace and Flight Testing
DESCRIPTION
The ENDEVCO®Model 2221F piezoelectric accelerometer is designed specifically for high temperature vibration
measurement on small structures and objects.
The unit is hermetically sealed and it is ideal for use in
extreme environmental conditions. Its light weight (11 gm)
effectively minimizes mass loading. The accelerometer is a
self-generating device that requires no external power
source for operation.
The Model 2221F features ENDEVCO’s PIEZITE®Type
P-8 crystal element, operating in annular shear mode.
This unit exhibits excellent output sensitivity stability over
time. Signal ground is connected to the outer case of the
unit and, when used with an isolated mounting screw, the
accelerometer is electrically isolated from ground.A lownoise coaxial cable is supplied for error-free operation.
The transducer has a centrally located thru bolt, allowing
for 360° cable orientation. The unit may also be adhesively
mounted if the application permits.
ENDEVCO Signal Conditioner Models 133, 2775A or
OASIS 2000 Computer-Controlled System are
recommended for use with this high impedance accelerometer.
Actual size
.021 DIA SAFETY
WIRE HOLES
INSULATED MOUNTING SCREW ASSEMBLY
MATES WITH ENDEVCO
3000 SERIES CABLES WITH
10-32 UNF-2B CONNECTOR
.21
(3.1)
F-CAD: PS2221F
(6.1)
.24
.363
(9.22)
6-32 UNC-2A THD
.013
(.33)
STANDARD TOLERANCE
INCHES (MILLIMETERS)
.XX = +/- .02 (.X = +/- .5)
.XXX = +/- .010 (.XX = +/- .25)
.496 DIA
(12.60)
.140
DIA
(3.56)
.600
(15.24)
UNIT IDENTIFICATION
.35
(8.9)
.12
(3.1)
INSULATED MOUNTING
SURFACE (HARD
ANODIZED ALUMINUM)
DIA
.52
(13.2)
TYPICAL AMPLITUDE RESPONSE
% DEVIATION
1 10 100 1000 10000 100000
FREQUENCY IN HERTZ
APPLIES TO CALIFORNIA FACILITY
20
15
10
5
0
-5
-10
-15
-20
% DEVIATION
-100 0 100 200 300 400 500
(-73) (38) (149) (260)
TYPICAL TEMPERATURE RESPONSE
TYPICAL CAPACITANCE
CHARGE SENSITIVITY
TEMPERATUREoF (oC)
120
100
80
60
40
20
0
-20
-40
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DYNAMIC CHARACTERISTICS Units
CHARGE SENSITIVITY
TYPICAL pC/g 10.0
MINIMUM pC/g 7.5
FREQUENCY RESPONSE See Typical Amplitude Response
RESONANCE FREQUENCY kHz 45
AMPLITUDE RESPONSE [1]
±5% Hz 1 to 10 000
±1dB Hz .5 to 12 000
TEMPERATURE RESPONSE See Typical Curve
TRANSVERSE SENSITIVITY % ≤ 3
AMPLITUDE LINEARITY [2] % 1
Per 400 g, 0 to 2000 g
ELECTRICAL CHARACTERISTICS
OUTPUT POLARITY Acceleration directed into the base of the unit
produces positive output
RESISTANCE GΩ ≥ 10
ISOLATION MΩ 10
CAPACITANCE pF 900
GROUNDING Signal return is connected to case. Case is
isolated from mounting surface by insulated screw
assembly
ENVIRONMENTAL CHARACTERISTICS
TEMPERATURE RANGE -67°F to +500°F (-55°C to +260°C)
HUMIDITY Hermetically sealed
SINUSOIDAL VIBRATION LIMIT g pk 1000
SHOCK LIMIT g pk 3000
BASE STRAIN SENSITIVITY equiv. g pk/µ strain 0.02
THERMAL TRANSIENT SENSITIVITY equiv. g pk/°F (/°C) 0.004 (0.007)
PHYSICAL CHARACTERISTICS
DIMENSIONS See Outline Drawing
WEIGHT gm (oz) 11 (0.39)
CASE MATERIAL Stainless Steel
CONNECTOR Coaxial, 10-32 male thread
MOUNTING TORQUE lbf-in (Nm) 8 (1)
CALIBRATION
SUPPLIED:
FREQUENCY RESPONSE % 20 Hz to 10 000 Hz
dB 10 kHz to 50 kHz
CHARGE SENSITIVITY pC/g
MAXIMUM TRANSVERSE SENSITIVITY %
CAPACITANCE pF
ENDEVCO
MODEL
2221F
SPECIFICATIONS
The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75°F (+24°C) and 100 Hz,
unless otherwise noted. Calibration data, traceable to National Institute of Standards and Technology (NIST), is supplied.
ACCESSORIES
Model 3090C-120 (10 ft) CABLE ASSEMBLY
P/N 10207 INSULATED MOUNTING SCREW, 6-32
P/N EHM49 ALLEN WRENCH, 7/64 INCH
Model 2987 ADHESIVE MOUNTING ADAPTER
OPTIONAL ACCESSORIES
Model 2771AM3 IN-LINE CHARGE CONVERTOR FOR
USE WITH CONSTANT CURRENT
SOURCE
Model 2950M3 TRIAXIAL MOUNTING BLOCK
Piezoelectric Accelerometer
NOTES
1. Low-end response of the transducer is a function of its
associated electronics.
2. Short duration shock pulses, such as those generated by metalto-metal impacts, may excite transducer resonance and cause
linearity errors. Send for TP290 for more details.
3. Maintain high levels of precision and accuracy using Endevco's
factory calibration services. Call Endevco’s inside sales force at
800-982-6732 for recommended intervals, pricing and turnaround time for these services as well as for quotations on our
standard products.
Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco maintains a program of
constant surveillance over all products to ensure a high level of reliability. This program includes attention to reliability factors during product design, the support of
stringent Quality Control requirements, and compulsory corrective action procedures. These measures, together with conservative specifications have made the
name Endevco synonymous with reliability.
ENDEVCO CORPORATION, 30700 RANCHO VIEJO ROAD, SAN JUAN CAPISTRANO, CA92675 USA (800) 982-6732 (949) 493-8181 fax (949) 661-7231
www.endevco.com Email:applications@endevco.com
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