Atec Endevco-2272 User Manual

% DEVIATION

FREQUENCY IN HERTZ

TYPICAL AMPLITUDE RESPONSE

% DEVIATION

TYPICAL TEMPERATURE RESPONSE

Model 2272
Piezoelectric accelerometer

Features Description

• Long term stability

• Hermetically sealed

• Operational to -452°F (-269°C)

• Requires no external power

• Vibration measurement at extreme temperature

The Endevco® model 2272 is a piezoelectric
accelerometer designed specifically for vibration
measurement at temperature extremes. The unit is
hermetically sealed for use in harsh environments and
features long term stability. Its unique sensing elements
offer an unusually flat temperature response over a broad
range. The accelerometer is a self-generating device that
requires no external power source for operation.

The model 2272 features Endevco’s Piezite® type P-10
crystal element, operating in compression mode. This
unit exhibits excellent output sensitivity stability over
time. Signal ground is connected to the outer case of
the unit. When used with an isolated mounting stud, the
accelerometer is electrically isolated from ground. The
accelerometer features a 10-32 UNF-2A side-connector. A
low-noise coaxial cable is supplied for error-free operation.

Endevco signal conditioner models 133, 2775B, 2771C, 6634C or Oasis 2000
computer-controlled 4990A-X system are recommended for use with this high
impedance accelerometer with cards 428 and/or 433.

20

15

10

5

0

-5

-10

-15

110 100 1000 10000

-20

CAPACITANCE

CHARGE SENSITIVITY

-400 -300 -200 -100 0 100 200 300 400 500

(-240) (-129) (-18) (38) (149) (260)

TEMPERATURE ϒF (ϒC)

30

25

20

15

10

5

0

-5

-10

-15

-20

Model 2272
Piezoelectric accelerometer

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.

Dynamic characteristics Units 2272

Charge sensitivity
Typical pC/g 13
Minimum pC/g 10.4
Frequency response See typical amplitude response
Resonance frequency, typical kHz 30
Minimum kHz 28
Amplitude response [1]
±5% Hz 1 to 5000
±1dB (ref.) Hz 1 to 9000
Temperature response [3] See typical curve
Transverse sensitivity % ≤ 3
Amplitude linearity
Per 1000 g, 0 to 2000 g % 1

Electrical characteristics

Output polarity Acceleration directed into the base of the unit produces positive output
Resistance GΩ ≥ 10
at +500°F (+260°C) MΩ ≥ 100
Capacitance pF 2700
Grounding Signal ground connected to case

Environmental characteristics

Temperature range -452°F to +500°F (-269°C to +260°C)
Humidity Hermetically sealed
Sinusoidal vibration g pk 1000
Shock limit [2] g pk 2000
Base strain sensitivity equiv. g pk/μ strain 0.04
Thermal transient sensitivity equiv. g pk/˚F (/˚C) 0.08 (0.144)
Electromagnetic sensitivity equiv. g rms/gauss 0.0002
Acoustic sensitivity at 140 dB SPL equiv. g 0.001
at 170 dB SPL equiv. g 0.03
Pressure
Low frequency up to 1000 Hz equiv. g/psi 0.01
Salt spray Will meet MIL-E-5272 with potted connector

Physical characteristics

Dimensions See outline drawing
Weight oz (gm) 0.95 (27)
Case material Stainless steel
Connector 10-32 UNF-2A Thd, mates with Endevco 3000 series cable
Mounting torque lbf-in (Nm) 18 (2)

Calibration

Supplied:
Charge sensitivity pC/g
Capacitance pF
Maximum transverse sensitivity %
Charge frequency response % 20 Hz to 5000 Hz

dB 5000 Hz thru resonance

APPLIES TO CALIFORNIA FACILITY

Accessories:

Product Description 2272

92981-12 Mounting stud, 10-32, Hex I.D. Included

3090DV-120 Cable assembly, 10 ft Included

EHM464 Wrench, hex key Included

2981-3 Stud, 10-32 adapter Optional

133 Signal conditioner Optional

2771C In-line charge convertor IEPE powered Optional

2775B Signal conditioner Optional

6634C Signal conditioner Optional

4990A-X OASIS 2000 computer-controlled system with 428 and/or 433 Optional

CS330 Calibration cryogenic temperature response Optional

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. ALL RIGHTS RESERVED 30700 RANCHO VIEJO ROAD, SAN JUAN CAPISTRANO, CA92675 USA
[phone] • [phone] fax [phone] • www.endevco.com • Email: [e-mail] 080510

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 metal-to-metal
impacts, may excite transducer resonance and cause linearity errors. Request
the TP290 for more details.

3. Exposure to rapid temperature changes greater than 100°F (38°C) per minute
may cause the device to produce spurious high frequency discharges for
several minutes.

4. 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.