Piezoelectric Accelerometer ENDEVCO
MODEL
6240C-10
Model 6240C-10
• Balanced Differential Output
• Ground Isolated
• 3 Hole Mounting Flange
• Requires No External Power
• Jet Engine Maintenance
DESCRIPTION
The ENDEVCO®Model 6240C-10 is a self-
generating piezoelectric transducer that requires no
external power for operation. The accelerometer
has been ruggedized with a three-hole mounting
flange and rugged 2-pin connector to withstand
the normal environment of jet engine installation
maintenance.
The 6240C-10 utilizes tourmaline crystal material
designated as PIEZITE®Type P-21 sensing crystal
to provide good temperature response and stability
at temperatures as high as +1200°F (+649°C). The
sensitivity of each Model 6240C-10 accelerometer
is permanently adjusted to 10 pC/g ±5% to allow
interchange of transducers without adjustment of
the connected signal conditioner. The differential
output signal eliminates the need for special
coaxial cable and, instead, permits the use of
twisted-pair shielded cable. This special feature
reduces noise pickup due to electrical ground
potentials.
ENDEVCO Signal Conditioner Models 2777,
6634B or 68221/2 are recommended for use with
this high impedance accelerometer.
Actual size
1.188 DIA
(30.18)
POSITIVE SIGNAL PIN
.185 (4.70) DIA 3 PL
.179 (4.55)
SERIAL NUMBER
.150 (3.81) R 3 PL
MATES WITH ENDEVCO
6918 SERIES CABLES
WITH 7/16-27 UNS-2A
CONNECTOR
.250
(6.35)
.750 DIA
(19.05)
SENSITIVE AXIS
+
-+
.40
(10.2)
.069
(1.75)
.45 MAX
(11.4)
UNIT IDENTIFICATION
1.45
(36.8)
STANDARD TOLERANCE
INCHES (MILLIMETERS)
.XX = +/- .03 (.X = +/- .8)
.XXX = +/- .010 (.XX = +/- .25)
-10
-5
0
5
10
15
20
-100 0 100 200 300 400 500 600 700 800 900 1000 1100 1200
% DEVIATION
TEMPERATURE °F (°C)
CHARGE SENSITIVITY
(-73) (204) (427) (649)
-20
-15
-10
-5
0
5
10
15
20
1 10 100 1000 10000
% DEVIATION
FREQUENCY IN HERTZ
TYPICAL AMPLITUDE RESPONSE
%DEVIATION
%DEVIATION
TEMPERATURE °F (°C)
FREQUENCY IN HERTZ
TYPICAL TEMPERATURE RESPONSETYPICAL AMPLITUDE RESPONSE
APPLIES TO CALIFORNIA FACILITY
DYNAMIC CHARACTERISTICS Units
CHARGE SENSITIVITY
Typical pC/g 10
Minimum pC/g 9.5
Maximum pC/g 10.5
FREQUENCY RESPONSE See Typical Amplitude Response
RESONANCE FREQUENCY
Typical kHz 16
Minimum kHz 13
AMPLITUDE RESPONSE
±5% Hz 5 to 2500
±1dB Hz 2 to 4000
TEMPERATURE RESPONSE % ±10 at -58°F to +1200°F (-50°C to +649°C)
TRANSVERSE SENSITIVITY % ≤5
AMPLITUDE LINEARITY % ±1 per 250g, 0 to 2000g
ELECTRICAL CHARACTERISTICS
OUTPUT POLARITY Acceleration directed into base of unit produces
positive output at left receptacle pin (looking into
receptacle)
RESISTANCE (At room temperature) GΩ ≥ 1 [2]
At +1200°F (+649°C) kΩ ≥ 10
ISOLATION GΩ ≥ 1 [2]
At +1200°F (+649°C) kΩ ≥ 10
CAPACITANCE pF 150
Either Signal Pin to Case pF ≤10 2pF max unbalance between pins
GROUNDING Signal return isolated from case
ENVIRONMENTAL CHARACTERISTICS
TEMPERATURE RANGE -58°F to +1200°F (-50°to +649°C)
HUMIDITY Hermetically Sealed
SINUSOIDAL VIBRATION LIMIT g pk 1000
SHOCK LIMIT g pk 2000
BASE STRAIN SENSITIVITY equiv. g pk/µ strain 0.002
TRANSIENT TEMPERATURE [1] equiv. g pk/°F(/°C) 0.04 (0.07)
ACOUSTIC SENSITIVITY g at 154 dB .001
MAGNETIC SENSITIVITY g rms/kGauss rms 0.5
PHYSICAL CHARACTERISTICS
DIMENSIONS See Outline Drawing
WEIGHT gm (oz) 200 (7) maximum
CASE MATERIAL Inconel
CONNECTOR Two pin receptacle designed to mate with
ENDEVCO 6918 Series Cable Assembly (900°F
maximum) or equivalent [3]
MOUNTING TORQUE lbf-in (N•m) 14 (1.6)
SUPPLIED CALIBRATION
CHARGE FREQUENCY RESPONSE % 50 to 2500 Hz
CHARGE SENSITIVITY pC/g
TRANSVERSE SENSITIVITY %
MAXIMUM CAPACITANCE pF
ENDEVCO
MODEL
6240C-10
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 the National Institute of Standards and Technology (NIST), is supplied.
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 turn-around
time for these services as well as for quotations on our standard
products.
Model 2777
DYNAMIC CHARACTERISTICS Units
CHARGE SENSITIVITY
Typical pC/g 10
Minimum pC/g 9.5
Maximum pC/g 10.5
FREQUENCY RESPONSE See Typical Amplitude Response
RESONANCE FREQUENCY
Typical kHz 16
Minimum kHz 13
AMPLITUDE RESPONSE
±5% Hz 5 to 2500
±1dB Hz 2 to 4000
TEMPERATURE RESPONSE % ±10 at -58°F to +1200°F (-50°C to +649°C)
TRANSVERSE SENSITIVITY % ≤5
AMPLITUDE LINEARITY % ±1 per 250g, 0 to 2000g
ELECTRICAL CHARACTERISTICS
OUTPUT POLARITY Acceleration directed into base of unit produces
positive output at left receptacle pin (looking into
receptacle)
RESISTANCE (At room temperature) GΩ ≥ 1 [2]
At +1200°F (+649°C) kΩ ≥ 10
ISOLATION GΩ ≥ 1 [2]
At +1200°F (+649°C) kΩ ≥ 10
CAPACITANCE pF 150
Either Signal Pin to Case pF ≤10 2pF max unbalance between pins
GROUNDING Signal return isolated from case
ENVIRONMENTAL CHARACTERISTICS
TEMPERATURE RANGE -58°F to +1200°F (-50°to +649°C)
HUMIDITY Hermetically Sealed
SINUSOIDAL VIBRATION LIMIT g pk 1000
SHOCK LIMIT g pk 2000
BASE STRAIN SENSITIVITY equiv. g pk/µ strain 0.002
TRANSIENT TEMPERATURE [1] equiv. g pk/°F(/°C) 0.04 (0.07)
ACOUSTIC SENSITIVITY g at 154 dB .001
MAGNETIC SENSITIVITY g rms/kGauss rms 0.5
PHYSICAL CHARACTERISTICS
DIMENSIONS See Outline Drawing
WEIGHT gm (oz) 200 (7) maximum
CASE MATERIAL Inconel
CONNECTOR Two pin receptacle designed to mate with
ENDEVCO 6918 Series Cable Assembly (900°F
maximum) or equivalent [3]
MOUNTING TORQUE lbf-in (N•m) 14 (1.6)
SUPPLIED CALIBRATION
CHARGE FREQUENCY RESPONSE % 50 to 2500 Hz
CHARGE SENSITIVITY pC/g
TRANSVERSE SENSITIVITY %
MAXIMUM CAPACITANCE pF
ENDEVCO
MODEL
6240C-10
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 the National Institute of Standards and Technology (NIST), is supplied.
ACCESSORY
P/N EH534 (3) 8-32 UNC x 0.5 inch MOUNTING SCREW
socket head cap
NOTES
1. With 1 Hz high pass filter.
2. Prolonged exposure at elevated temperatures may decrease the
return to room temperature resistance to less than as 1MΩ, but will
not degrade the overall performance of the unit. All units are
processed to initially meet 1GΩat room temperature and will not be
less than 10KΩunder all conditions.
3. Temperature at connector mated to 6918 Cable Series is limited to
+900°F (+482°C).
Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco maintains a program of con-
stant 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, CA 92675 USA (800) 982-6732 (949) 493-8181 fax (949) 661-7231
www.endevco.com Email:applications@endevco.com
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