ASC 4421 44250 pages

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MEMS Capacitive Accelerometer

ASC 4421 / ASC 4425
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Uniaxial
4 Wire System
Amplified Output
Aluminium Housing /
Stainless Steel Housing
 Made in Germany

Features
 Range: ±1g to ±200g
 DC Response
 Gas Damped
 Excellent Bias and
Scale Factor Stability
 Low Power Consumption
 Single Ended Mode

Capacitive MEMS Technology
The accelerometers are based on a capacitive MEMS technology and can be used in a low
frequency response up from 0Hz. Inside the sensor element, the seismic mass is connected
with two conductive capacitor plates. If the seismic mass oscillates between the two capacitor
plates the capacitance will change. This capacitance change is converted via an ASIC
(Application Specific Integrated Circuit) into an analog signal.

Description
Options
 Customised Cable Length
 Customised Connector
 TEDS Module
Applications
 Structural Monitoring and
Testing
 Endurance Testing
 Brake Test
 Vibration Monitoring
 Civil Engineering
 Modal Analysis
 Vehicle Testing
 Automotive Ride Quality
& Comfort
 Railway Engineering
 Flutter Test

The models ASC 4421 and ASC 4425 are uniaxial accelerometers based on capacitive
technology. Both ASC accelerometers are manufactured with an improved chip technology.
The ASC 4421 and ASC 4425 therefore benefit from the high stability of the new chip technology
with a low noise level and a low bias and scale factor temperature coefficient.
The sensor has been developed specifically for measuring relatively small accelerations, as
required in the aerospace or automotive sector, for example. The ASC 4421 and ASC 4425
are shock resistant up to 5000g. Both versions require a supply voltage of between
+8VDC to +30VDC. The ±2VDC is DC coupled at a DC bias of 2.5V. The amplified output is
easy to use with all common data acquisition units.
The stainless steel package of the ASC 4425 provides a high resistance to strong environmental
influences. A very high flexible and rugged cable provides a simple mounting. The ASC 4421
and ASC 4425 are equipped with 6 meter cable as standard.

ASC GmbH · Advanced Sensors Calibration · Schäfflerstraße 15 · 85276 Pfaffenhofen · Germany