Inclination Sensor ±25° NS25/E2 APPLICATION NOTES General Information The NS-25/E2 inclinometer is designed for OEM applications. It is a newly developed sensor, manufactured in modern micro system technology. Basically, the sensor consists of a measuring ceIl, manufactured in thin-film technique which is mounted on a PCB board containing electronic components. The circuit is designed to be very flexible, so that it can be adapted to different systems. The sensor can be adapted to various types of supply voltages by a number of solder straps. The provided interface is a voltage output signal. Circuit Description The inclinometer is working with a new circuit concept. We measure the conductivity over two pairs of electrodes based on the ground of the sensor cell. By tilting the sensor we change the liquid level over the electrodes, which causes a change in conductivity. Since we are using a difference measurement method, the temperature coefficient will be reduced. The electronic unit consists of the following functional blocks: frequency generator, reference voltage generator, signal conditioning, voltage supply, and auxiliary voltage generation. In the standard type NS-25/E2, a frequency generator generates the a.c. frequency, which then connects the reference voltage synchronously to the sensor element. Then the uncoupled signal is rectified and divided into X- and Y-signal synchronized by the frequency. Thereafter the signal is available at the output. HL-Planartechnik GmbH Hauert 13, 44 227 Dortmund, Tel.: +49 (0) 231/97400, Fax.: +49 (0) 231/974020 Internet: http://www.hlplanar.com E-Mail: [email protected] Inclination Sensor ±25° Modifications of NS-25/E2 The NS-25/E2 inclinometer was designed in such a way that, the sensor is adaptable to different applications by simple modifications of the PCB and solder strap options. The differences between the various types of inclinometers are based primarily on the voltage supply and the changing reference potential of the output voltage (ratiometrically around GND or U/2). The following table gives a summary of the available types of inclinometers: Type 1 3 4 7 Supply Voltage +10 VDC +5 VDC +7…+24 VDC +7…+24 VDC Type of Voltage Supply unipolar, fixed unipolar, fixed unipolar, variable unipolar~ variable Output Voltage X-IY-Output +/-2,5 V around 5 V +/-2 V around 2,5 V +/-2 V around 2,5 V +/-2,5 V around GND Options: It is possible to choose whether there are potentiometers for zero and sensitivity. These facilitate easy adaptation to the mounting location and variation of the output voltage of the two analog outputs. For temperature compensation and long-term stability reasons the electronic system of the NS-25/E2 does not contain any linearization of characteristics! Tuning The standard type is equipped with three potentiometers. This enables the user to adjust the sensitivity (+/-20%) for both measuring axes at the same time and zero point (+/-5°) for each axis separately. For applications where vibrations can appear the sensor is also available without the potentiometers. Then the sensitivity is preset and zero deviates about +/-2% from absolute zero. The outputs The analog outputs should not be connected with resistance loads less than 1 kOhm. They are only partially short-circuit proof. Short circuits with positive supply voltage should be avoided. HL-Planartechnik GmbH Hauert 13, 44 227 Dortmund, Tel.: +49 (0) 231/97400, Fax.: +49 (0) 231/974020 Internet: http://www.hlplanar.com E-Mail: [email protected] Inclination Sensor ±25° Specifications ± 25° Two (x/y) orthogonal orientated Depends on type (see table) 2* 10-3 ° 0.6% [FS] < 1.5% [FS] Measuring range: Measuring axes: Output: Resolution: Precision: Banking sensitivity: Temperature stability Zero point: Sensitivity: Supply voltage: Current consumption: 2*10-3 / K 5*10-3 / K Depends on type (see table) 7--30 mA (depends on type, see table) Pin strip and soldering pads -25°C … +70°C -40°C … +85°C 50mm x 50mm x 12mm Approx. 20g Contact: Operating temperature: Storage temperature: Dimensions: Weight: NS-25/E2 Output in Volt 3,000 2,000 1,000 Inclination in ° 0,000 -30 -20 -10 0 -1,000 10 20 30 -2,000 -3,000 HL-Planartechnik GmbH Hauert 13, 44 227 Dortmund, Tel.: +49 (0) 231/97400, Fax.: +49 (0) 231/974020 Internet: http://www.hlplanar.com E-Mail: [email protected] Inclination Sensor ±25° Biaxial Inclinosensor NS-25/E2 Biaxial Inclinosensor NS-25/E2 (Type 1: Operating Voltage: +10VDC, Output +/-2,5V around 5V) 16mm 16mm (Type 3: Operating Voltage: +5 VDC, Output +/-2 V around 2,5 V) Electronic p.c. board Electronic p.c. board P2 P3 P2 P3 Y +10 VDC U/2 (5 VDC) GND X-Achse Y-Achse X NS-25/B2 50mm 50mm Y NS-25/B2 P1 P1 50mm 50mm Potentiometer: P1: P2: P3: +5 VDC U/2 (2,5 VDC) GND X-Achse Y-Achse X Potentiometer: Wiring: Sensitivity Zero Y-axis Zero X-axis +10 VDC P1: P2: P3: Wiring: Sensitivity Zero Y-axis Zero X-axis +5 VDC GND NS-25/E2 V V x NS-25/E2 y Biaxial Inclinosensor NS-25/E2 V 16mm 16mm 7 (Type 7: Operating Voltage +5...24 VDC, Output +/-2,5 V around GND) Electronic p.c. board Electronic p.c. board P2 P3 P2 P3 Y 7 +5...24 VDC U/2 (2,5 VDC) GND X-Achse Y-Achse X NS-25/B2 50mm 50mm Y X P1 50mm 50mm Potentiometer: Wiring: Sensitivity Zero Y-axis Zero X-axis 7 +5...24 VDC GND NS-25/E2 +5...24 7 VDC GND NC X-Achse Y-Achse NS-25/B2 P1 Potentiometer: GND y Biaxial Inclinosensor NS-25/E2 7 (Type 4: Operating Voltage: +5...24 VDC, Output +/-2V around 2,5V) P1: P2: P3: V x V x V y P1: P2: P3: Wiring: Sensitivity Zero Y- axis Zero X- axis + 75...24 VDC GND NS-25/E2 V x V y HL-Planartechnik GmbH Hauert 13, 44 227 Dortmund, Tel.: +49 (0) 231/97400, Fax.: +49 (0) 231/974020 Internet: http://www.hlplanar.com E-Mail: [email protected] Stand: 10.12.02 Design: Zn