Sensor box containing two sensors and two signal conditioners with 4...20mA, 2-wire outputs



The SB2I is a pressure die cast aluminium sensor housing (IP67) with two integrated sensors for measuring inclinations and/or accelerations along two axis.
As well as the sensors, the box contains two independent signal conditioners, each with a 4...20mA, 2-wire output, and two separate, highly stable voltage supply feeding off the corresponding current loop, one for each sensor. Furthermore, each signal conditioner includes an active low pass filter, whose upper cut-off frequency / settling time can be adjusted to suit the measurement task, an output stage with current limitation, a noise voltage filter and a diode bridge for unipolar connection to the current loop. Interference signals caused by unwanted ground currents are eliminated by electrically isolating each sensor and signal conditioner from each other and the housing.
A special electronic temperature compensation system can significantly reduce the temperature sensitivity of the implemented sensors. The compact PG cable gland and small housing size in combination with the 3-wire connection enable the use of this high quality measuring system in harsh operating conditions.


The SB2I is suitable for applications requiring precise inclination or acceleration measurements along two axis under harsh circumstances and returning of a 4...20mA output signal each. Areas of successful implementation include construction, mining, agricultural machinery, transportation and conveyor systems, ships, operation and automation technology as well as general mechanical engineering.

Technical Specifications

Terminals max.: 6 x 1,5 mm2
Cable fixing M12 x 1.5 cable gland, clamping range 6mm ... 7.5mm
Measuring range, Resolution, etc. dependents on implemented SEIKA sensors
Degree of protection IP67
Mounting orientation any
Measuring planes (N.. sensors) 3 main housing planes
Measuring directions (B.., BD.. sensors) in X,Y,Z coordinate of housing
Terminal voltage 10V ... 30V
Minimum loop currents 2.5mA ... 3.5mA
Maximum loop currents 22mA ... 26mA
Output signal loop current 4mA ... 20mA (12mA for zero position)
Adjustable variables zero point (12mA), amplification
Maximum load resistances 500_Ohm (at 24 Volt supply voltage)
Low pass filter active, 3rd order, minimal ripple
Operating temperature -40...+85°C

Options: special measuring ranges, calibration record, silicon encapsulation, custom wiring

Dimensions (in mm)

Block Diagram



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