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Features
- small size light weight
- linear output response
- high measurement accuracy
- small zero drift
- small cross sensitivity
- high long term stability - virtually infinite lifespan
- hysteresis-free output signal
- integrated sensor electronics including signal conditioner and low-pass filter
- no data memory with memory loss
- temperature compensated, conditioned 0...5V output signal
- highly stable internal voltage regulation
- optional 5 Volt reference voltage output
- unconditioned operating voltage between 9V and 30V
- low power consumption
- protection against reverse supply voltage polarity
- EMC certified CE certified
- no interference by surrounding electromagnetic fields
- shockproof as without moving mechanical parts
- hermetically sealed
- sensor electrically isolated from point of measurement by high quality plastic housing – no ground connection
- zero point adjustable through 360° using clamping ring
Description
The capacitive, dielectric liquid based inclinometers NA2-05, NA2-10, NA3-30, NA4-45 and NA4-70 contain new sensor electronics. These are made up of a highly stable, laser-trimmed signal conditioner with electronic compensation for temperature drift, highly stable supply voltage regulation circuitry and low-pass filtering of the measurement signal to eliminate unwanted noise.
The capacitive measurement principle guarantees a very stable, linear relationship between the inclination being measured and the normalised output signal.
The sensor electronics require minimal power and, together with the capacitive primary transformer, are characterised by low errors, high signal-to-noise ratio and high long-term stability.
Contrary to measuring inclinations using accelerometers, this measurement principle enables a linear relationship between the inclination to be measured and the output signal, independent of the constant of gravity at the place of measurement, i.e. Independently of where the measurement is taking place, whether in Europe, Australia, on Mount Everest or the Moon.
Application
The NA2, NA3 and NA4 can be used for measurements requiring small and light devices, replacability, measurement of relatively large inclinations and a normalised, analogue voltage output signal.
Measurements of inclinations in measuring instruments and inspection equipment, in water, land and air vehicles, in automation and safety technology, on cranes and lifting equipment, on robots, in the manufacture of scientific equipment, in medicine and telecommunication as well as navigation systems are typical examples.
Shared Technical Specifications
| Supply voltage 1) | 9V … 30V DC | Dimensions | see dimension drawing |
| Current drawn | ca. 2mA | Reference voltage output 3) | 5,00 Volt |
| Externally regulated supply voltage 2) | 5 Volt | Temperature drift of the reference voltage | < 25 ppm/K |
| Current drawn with external supply voltage 5V | approx. 1mA | Maximum current of the reference voltage output | 5mA |
| Maximum Operating Temperature | +85°C | Output resistance | ca. 100 Ohm |
| Minimum Operating Temperature | -40°C | Protection | IP 65 |
| Maximum Storage Temperature | +90°C | Weight (Sensor excluding mounting ring and cable) | 18,5 g |
| Minimum Storage Temperature | -55°C | Enviroment Humiditi | 0…100% r.F. |
| Signal-to-noise ratio at signal output (0…10kHz) | <150µVss | Electrical signal-to-noise ratio | >85dB |
| Transverse sensitivity at 45° tilt | <1% of measure-ment value | Voltage Offset (at Cero degree tilt) | 2,5 Volt |
| Settling time (to 98% of the actual value) | <0,3 s | Maximum output voltage range | 0.05V ... 4.95V |
| Terminals | 3 (4) highly flexible cables, Øca.1mm, length 18cm optionally: shielded cable Ø2,1mm | ||
Notes:
1) Standard supply voltage
2) optional externally regulated supply voltage
3) reference voltage output (+5,00 V) only optionally connected (for wire terminals only)
Each sensor will be delivered with individual calibration dates (offset, sensitivity) and calibration record.
Technical Specifications of types NA2-05 and NA2-10
| Typ | NA2-05 | NA2-10 |
| Measuring range | ±5degrees | ±10degrees |
| Resolution | <0,001degrees | <0,002degrees |
| Nominal sensitivity | 400mV/degree | 200mV/degree |
| Output voltage range | 2,5V±2V at ±5° | 2,5V±2V at ±10° |
| Linearity deviation over whole measurement range | <±0,02degrees | <±0,03degrees |
| sensitivity shift over a temperature range -25°C...85°C | <2% | <2% |
| Temperature drift of zero point | ±0,002degrees/Kelvin | ±0,002degrees/Kelvin |
Technical Specifications of types NA3-30, NA4-45 and NA4-70
| Typ | NA3-30 | NA4-45 | NA4-70 |
| Measuring range | ±30degrees | ±45degrees | ±70degrees |
| Resolution | <0,005degrees | <0,01degrees | <0,01degrees |
| Nominal sensitivity | 66,6.. mV/degree | 44,4.. mV/degree | 28,57 mV/degree |
| Output voltage range | 2,5V±2V at ±30° | 2,5V±2V at ±45° | 2,5V±2V at ±70° |
| Linearity deviation over whole measurement range | < 0,06 degrees | < 0,14 degrees | < 0,28 degrees |
| sensitivity shift over a temperature range -25°C...85°C | <2% | <2% | <2% |
| Temperature drift of zero point | ±0,002deg/Kelvin | ±0,003deg/Kelvin | ±0,003deg/Kelvin |
Summary of standard SEIKA products |
Static Accelerometers (lower cut-off frequency = 0 Hz)
| Model | Measuring range | Resolution |
| B1, B2, B3 | ±3g, ±10g, ±50g ( 1g = 9.81ms-2 ) | <0.001g, <0.005g, <0.01g |
Dynamic Accelerometers (lower cut-off frequency = 1 or 10 Hz)
| Model | Measuring range | Resolution | Frequenzy range |
| BDK3 | ± 3 g | < 10-3 g | 1...300 Hz |
| BDK10 | ± 10 g | < 5*10-3 g | 1... 800 Hz |
| BDK100 | ± 100 g | < 1*10-2 g | 1... 1.5 kHz |
Inclinometers
| Model | Measuring range | Resolution |
| NB3 | ±10° (±20°) | <0.001° |
| NA2-05, NA2-10 | ±5°, ±10° ±30° ±45°, ±70° | <0.001Grad, <0.002Grad <0.005Grad <0.01Grad, <0.01Grad |
| N2, N3, N4 | ±10°, ±30°, ±70° | <0.001°, <0.005°, <0.005° |
| NG2, NG3, NG4 | ±10°, ±30°, ±80° | <0.001°, <0.005°, <0.005° |
| NG...I | Inclinometer type NG2, NG3, NG4 with integrated 4...20mA signal conditioner | |
| NG...U | Inclinometer type NG2, NG3, NG4 with integrated 0...5V signal conditioner | |
| NG360 | Inclinometer with 360° measuring range and integrated microprocessor and RS485 interface | |
Sensor boxes (for harsh operating conditions)
| Model | Features |
| SB1I | Sensor box (98 x 64 x 56mm3) with one integrated SEIKA sensor of any type and one integrated signal conditioner with 4...20mA output. |
| SB2I | Sensor box (98 x 64 x 56mm3) with two integrated SEIKA sensors of type B, BD, BDK, N or NB and two integrated signal conditioners with a 4...20mA output each. Both channels are electrically isolated from each other. |
| SB1U | Sensor box (98 x 64 x 56mm3) with one integrated SEIKA sensor of any type and one integrated signal conditioner with 0...5V output. |
| SB1S | Sensor box (98 x 64 x 56mm3) with one integrated SEIKA sensor of any type, one integrated signal conditioner with 0...5V output and two open collector switch outputs that respond to traversing of adjustable thresholds. |
| SBS1U | Sensor box (98 x 64 x 56mm3) with one integrated SEIKA-Servo-Inclinometer for measuring small angles of up to 2 degrees with very high resolution and an integrated signal conditioner with 0...5V output. |
| SB360 | Sensor box (98 x 64 x 56mm3) with one integrated SEIKA sensor of type NG360, internal microprocessor and RS485 interface. |
| SBG2U | Sensor box (124 x 80 x 58mm3) with two integrated SEIKA sensors of type NG and two 0...5V outputs. |
| SBG3I | Sensor box (124 x 80 x 58mm3) with three integrated SEIKA sensors and three integrated signal conditioners with 4...20mA output. |
| SBL1 | Sensor box (180 x 180 x 100mm3 - large and robust) with one integrated SEIKA sensor of any type and one integrated signal conditioner with 4...20mA output. |
| SBL1S | Sensor box (180 x 180 x 100mm3 - large and robust) with two integrated SEIKA sensors of any type, one integrated signal conditioner with 4...20mA output, one integrated signal conditioner with 0...5V output and two safety relays that respond to traversing of adjustable thresholds. The SBL1S has two redundant, electrically isolated measuring channels for safety related applications. |
| XB.. | Extra robust, pressure-, saltwater- and corrosion-proof stainless steel sensor box (ø120 x 50) as an alternative to the SB.. housings (180 x 180 x 100mm3) for especially harsh operating conditions, aggressive fluids and saltwater. |
| SC485B | Box (63.5 x 58 x 35mm3) with RS485/RS232 converter for operation of inclinometers NG360, SB360, and XB360 from a RS232 port. |
Sensor accessories
| Model | Features |
| NV4a | Filtering signal conditioner for sensor signal matching with symmetrical +/- 4 V voltage output |
| NV6a | Filtering signal conditioner for sensor signal matching to a 4...20mA, 2-wire interface |
| NV8a | Filtering signal conditioner for sensor signal matching with an asymmetric 0...5V output voltage |
| SW3 | Sensor cube for multiaxial arrangement of SEIKA accelerometers and/or SEIKA inclinometers |
| SBBS, SBBB, SBBW | Fixing plates from stainless steel for sensor boxes SB.. |
