CH30I0 pages

CH30I Sensor

Medium Frequency & Low Noise
Integral Preamp Acoustic Emission Sensor
Description and Features

Operating Specifications

The CH30I sensor is a medium frequency, resonant, acoustic
emission sensor with an integral, low noise, filtered, 40 dB
preamplifier that can drive up to 500 feet of cable. The
sensor comes standard with PAC’s unique “Auto Sensor Test”
(AST*) function.

t Dynamict

The CH30I features a strong, insulated, lightweight,
aluminum alloy, integrated body structure that is colorcoded purple to identify the sensor model. This sensor’s
outside shell is anodized, providing a nonconductive finish
to prevent any possible electric shorts from metal testing
structures. It is the same size and has the same frequency
response and sensitivity as the R30I sensor, but the EMI
shielding ability of the CH30I has been improved by more
than 300% compared with previous versions.

Peak Sensitivity, Ref V/(m/s); Ref [V/µbar].............. 97 [-22] dB
Operating Frequency Range. ............................ 125 - 450 kHz
.
Resonant Frequency Ref V/(m/s); Ref [V/µbar]......300 [350] kHz
Directionality. .................................................... ±1.5 dB
.

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Gain.
...................................................................40 dB
Power Requirements.............................. 16 -30 Vdc @ 25 mA
Dynamic Range..................................................... >80 dB
Output Voltage....................................... 20 V peak to peak
Noise Level (RMS rti)............................................. <2.4 µV
Output Drive Impedance. ...........................................50 Ω
.
Sensor Drive Capability........................... up to 500 ft (166 m)
AST Pulse. .......................... 24 V, 3 microseconds into crystal
.
Grounding................Case grounded, isolated from sensing face

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Applications

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Normally chosen for use in noisy environments

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Pipeline tests with flow noise
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Steel structure highway bridges with low frequency road
t and wind noises

Temperature Range. ......................................... -35 to 75ºC
.
Shock Limit........................................................... 500 g
Completely enclosed crystal for RFI/EMI immunity

Dimensions. ......................1.13” dia x 1.28” h (29 x 32.6 mm)
.
Weight............................................................ 45 grams
Case Material.................Purple color, anodized aluminum alloy
Face Material..................................................... Ceramic
Connector.............................................................. BNC
Connector Locations................................................. Side
Seal................................................................... Epoxy
Matching Cable. ................................................... 1234-X
.

Ordering Information and Accessories
Cable (specify cable length).............................................1234 - X
Magnetic Hold-Down . .................................................... MHR30I
.
Amplifier....................................................................... AE2A
Sensors include
NIST Calibration Certificate, Auto Sensor Test Function & Warranty

Frequency response of the CH30I. Calibration based on ASTM
E1106; Calibration based on ASTM E976.

* AST — Auto Sensor Testing feature allows AE systems to control the sensor as a pulser
and a receiver at the same time. It can therefore characterize its own condition as well
as send out a simulated acoustic emission wave that other sensors can detect, so the
condition of the nearby sensors also can be tested.

195 Clarksville Road, Princeton Junction, NJ 08550 Phone: 609-716-4000 t
Fax: 609-716-0706 Email: sales@pacndt.com Internet: www.pacndt.com
Due to continuing improvement, Physical Acoustics Corp. (PAC) reserves the right to amend specifications without notice.
Copyright © 2008 MISTRAS Group Inc. All Rights Reserved.

A Member of MISTRAS Group Inc.
Rev. 10/05 #117603