B1, B2, B3 
Accelerometers of high overload resistance with integrated electronics for measurement of acceleration in the frequency range 0 to several 100 Hz



The sensors B1, B2 and B3 are capacitive spring-mass accelerometers with integrated electronics. Resonant peaks are minimized by special gas-dynamic damping in the primary transformer.
The sensors are manufactured with an analog DC output. The sensor electronics require only small amounts of power and are in conjunction with the capacitive primary transformer characterized by low error and high long-term stability.


The accelerometers B1, B2 and B3 are used for applications requiring high overload tolerance, high long-term stability, small lower cut-off frequency down to measurement of static acceleration, very short on-transition delay and low power consumption. Typical applications include:

Technical Specifications

Typ: B1 B2 B3 
Measuring range 3g (ca.30m/s2 10g (ca.100m/s2 50g (ca.500m/s2
Resolution <10-3 <510-3 <210-2
Frequency range  0...160Hz 0...350Hz  0...550Hz
Linearity deviation <0,5%
Transverse sensitivity <1%
Mechanical overload resistance in direction of measurement  10 000 g (approx. 100 000 m/s2)
Nominal supply voltage (regulated)  UbN = 5Volt 
Permissible range of supply voltage  Ubz = 3V ... 6V 
Current drawn at Ub = 5V  approx.1mA 
Degree of protection IP65 
Operating temperature -40C ... +85C (125C optional)
Storage temperature -45C ... +90C (125C optional)
Weight (in metal housing without cable)  approx. 23 grams 
Standard electrical connection  3 highly flexible, color-coded wires 1mm, length approx. 18 cm (special lengths on request) 
Alternative electrical connection  0.5m strong, flexible, shielded cable 2.1mm (special lengths on request)
3 flexible, color-coded wires with Teflon insulation for extended temperature range
Values for analog DC output at UbN = 5 Volt 
Sensitivity  approx. 140mV/g  approx. 30mV/g approx. 7,5mV/g 
Temperature drift of sensitivity  <+610-2  % / K
Temperature drift of zero point  <0.1mV/K 
Zero offset at Ub=5V  2.50.1Volt - generally: 0.5Ub4% 
Output impedance 10 kOhm

*Each sensor will be delivery with individual calibration dates (offset and sensitivity) *on request: PWM-output

Dimensions (in mm) and Connections

Attention! The supply voltage must not exceed 6 Volt and the polarity must not be reversed.


SEIKA Mikrosystemtechnik GmbH - Ellharter Strasse 10 - 87435 Kempten - Germany - EMail: seika@seika.de -