Sensor box containing one sensor, one signal conditioner with 0...5V output and two open-collector output switches



The SB1S is a pressure die cast aluminium sensor housing (IP65) with an integrated sensor for measuring uniaxial acceleration or inclination.
As well as the sensor, the box contains a signal conditioner with a 0 ... 5V output and a separate, highly stable supply voltage that can be used externally as a reference point. Furthermore, the signal conditioner includes an active low pass filter, whole upper cut-off frequency / settling time can be tailored to suit the measurement task, and a noise voltage filter to guarantee the EMC. Interference signals caused by unwanted ground currents are eliminated by electrically isolating sensor and signal conditioner from the housing.
In addition to the voltage output, the SB1S has two open-collector output switches. Two helical trim-potentiometers enable the adjusting of two trigger thresholds within the measuring range, the exceeding of which causes the corresponding output switch to trigger. Optionally, the state transition can be set to be either off to on or on to off. The switching hysteresis can be adapted to the measuring task.
Unlike the SB2.., the SB1S can accommodate larger inclinometers, such as the NG-series, that have a higher measuring accuracy. A special electronic temperature compensation system can significantly reduce the temperature sensitivity of the implemented sensor.
The compact PG metal cable gland and small housing size in combination with the max. 6-wire connection enable the use of this high quality measuring system in harsh operating conditions.


The SB1S is suitable for applications requiring precise inclination or acceleration measurements under harsh circumstances, returning of a 0.5 ... 4.5V output signal and the availability of output switches. Areas of successful implementation include construction, mining, agricultural machinery, transportation and conveyor systems, ships, operation and automation technology as well as general mechanical engineering. The output switches have their application in safety surveillance systems and direct process control.

Technical Specifications

Terminals 6 x 1.5mm2
Cable fixing M12 x 1.5 cable gland, clamping range 6mm - 7.5mm
Measuring range, Resolution, etc. dependent on implemented SEIKA sensor
Degree of protection IP65
Mounting orientation any
Measuring planes (N.. sensor) 3 main housing planes
Measuring plane (NG.. sensor) parallel to bottom of housing
Measuring direction (B.., BD.. sensor) X,Y,Z coordinates of housing
Supply voltage 9V ... 30V
Operating current max. 5mA
Normalized output voltage range 0.5V ... 4.5V
Output zero point 2.5Volt
Maximum output voltage range 0.05V ... 4.95V
Output resistance 100 Ohm
Capacitive output loading capacity any, taking dynamic requirements into account
Switching transistors BCX56
Output switch loading capacity 50Volt, 0.3A
Adjustable variables zero point (2.5V), amplification, lower and upper trigger threshold
Low pass filter active, 5th order, minimal ripple
Operating temperature -40...+85°C

Options: special measuring ranges, custom switching hysteresis, switching state transition: LOW to HIGH or HIGH to LOW, calibration record, silicon encapsulation, custom wiring

Dimensions (in mm) and Connections

Diodes protect the open-collector outputs against voltage spikes when switching inductive loads.

Attention! Do not short circuit the supply voltage with one of the outputs.

Optionally, the open-collector outputs can be manufactured as:
upon exceeding trigger threshold conducting - version L
or: upon exceeding trigger threshold non-conducting - version N

Version L offers the possibility of connecting both open-collector outputs to one line (wired OR), thereby activating the control signal (e.g. siren) if either of the trigger thresholds is traversed.
Version N offers greater security in the activation of an alarm, since an transmission line break or a supply voltage failure causes a traversing of the trigger threshold (principle of quiescent current).


SEIKA Mikrosystemtechnik GmbH - Söllerweg1- D 87487 Wiggensbach - email: - Tel.+49 8370 9290070 - FAX:+49 8370 9290079