Sensor box for use in particularly harsh operating conditions containing two sensors, one signal conditioner with 4...20mA output, one signal conditioner with 0...5V output and two safety relays for threshold monitoring


Channel 1

Channel 2

Both channels


The SBL1S is a pressure die cast aluminium housing (IP65) with two integrated sensors for uniaxial measurement of inclinations.
In addition to the sensors, the housing contains one signal conditioner with 4...20mA output and one signal conditioner with 0...5V output. These include active low pass filters, whose upper cut-off frequencies / settling times can be adjusted to fit the measuring task, and noise voltage filters to ensure the EMC. Interference signals caused by undefined ground currents are eliminated by electrically isolating sensors and signal conditioners from each other and the housing.
The voltage output of the SBL1S has two switch outputs, each with a safety relay. Two helical potentiometers allow the setting of two trigger thresholds within the measuring range, at which the corresponding relay triggers. Each relay output has an independent opening and closing contact. The switching hysteresis can be adapted to the measurement task.
A special electronic temperature compensation system can significantly reduce the temperature sensitivity of the implemented sensor.
The compact PG cable gland and compact housing size in combination with the 15-wire connection enable the use of this high quality measuring system in harsh operating conditions.


The SBL1S has its application in areas requiring precise inclination measurements under harsh circumstances and consideration of special safety demands. Areas of successful implementation include construction, mining (especially large open pit mining machinery), agricultural machinery, transportation and conveyor systems, ships, operation and automation technology as well as general mechanical engineering.

Technical Specifications

Terminal connector 15channel x 1.5mm2 (pin rail)
Cable fixing PG21 (metal with integrated strain relief clamp)
Measuring range, Resolution, etc. dependent on implemented SEIKA sensor
Degree of protection IP65
Mounting orientation any
Measuring planes (N.., NB.. sensor) 3 main housing planes
Measuring plane (NG.. sensor) parallel to housing bottom
Operating temperature -40...+85°C
Channel 1 4...20mA current output
Terminal voltage 10V ... 30V
Minimum loop current 2.5mA ... 3.5mA
Maximum loop current 23mA ... 26mA
Output loop current 4...20mA (12mA for sensor zero position)
Adjustable variables zero (12mA), amplification
Maximum load resistance 500 Ohm (at 24Volt supply voltage)
Channel 2 0...5 Volt voltage and relay output
Supply voltage optionally 12V or 24V
Operating current max. 10mA
Normalized output range 0.5V ... 4.5V
Zero voltage 2.5Volt
Maximum output range 0.05V ... 4.95V
Output impedance 100 Ohm
Capacitive output signal loading capacity any, taking dynamic requirements into account
Switching stages two SIEMENS safety relays SA2A311; these relays comply with safety regulations
Contacts an independent open and close contact per relay
Contact loading capacity 250 Volt, 6 Ampere
Adjustable variables zero (2.5V), amplification, upper and lower trigger threshold
Low pass filter active, 4th order, minimal ripple

Options: special measuring ranges, custom switching hysteresis, calibration record

Dimensions (in mm)

Connections - 0 to 5 Volt and threshold monitoring channel

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


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