Features
- linear output characteristics
- high measurement accuracy
- high long-term stability
- hysteresis free output signal
- minimal zero point drift
- integrated sensor electronics
- low power consumption
- small housing
- light weight
- different output signal options
- no interference by ambient electromagnetic fields
- shockproof as without moving mechanical parts
- hermetically sealed
- sensor electrically isolated from point of measurement using high quality plastic housing - no ground connections
- zero point adjustable through 360° using clamping ring
Description
The N2, N3 and N4 are capacitive, liquid based inclinometers with integrated sensor electronics. They are manufactured with an analog DC output. The sensor electronics require only minimal power and are in conjunction with the capacitive primary transformer characterized by high accuracy, a high signal-to-noise ratio and high long-term stability.
The measurement technique enables a linear relationship between the angle to be measured and the output signal. The determined angle is independent of the local gravitational acceleration, that means that no matter where the measurement is being taken, whether in Europe, Australia, on Mount Everest or on the moon, the inclination will be measured correctly anywhere.
Application
The inclinometers N2, N3 and N4 are suitable for applications requiring a small, light sensor for measurement of relatively large inclinations.
Typical areas of application include measuring instruments and inspection systems, vehicles, automation and safety engineering, scientific devices, medical and communications equipment as well as navigational systems.
Technical Specifications
| Type | N2 | N3 | N4 |
| Measuring range | ±10 degrees | ±30 degrees | ±70 degrees |
| Resolution | <0,002 degrees | <0,005 degrees | <0,01 degrees |
| Linearity deviation | 0,2% of measuring range |
| Transverse sensitivity | <1% at 30° tilt |
| Settling time | <0,3 seconds |
| Supply voltage Ub (regulated) | 5 Volt |
| Permissible supply voltage range Ubz | 3V ... 6V |
| Mechanical overload resistance | 10 000 g (approx. 100 000 m/s2) |
| Current drawn at Ub = 5V | approx.1mA |
| Degree of protection | IP65 |
| Operating temperature | -40°C ... +85°C |
| Lagertemperatur | -45°C ... +90°C |
| Weight (in metal housing without cable) | 18,5 grams |
| Standard electrical connection | 3 highly flexible, color-coded wires ø1mm, length approx. 18 cm (special lengths on request) |
| Alternative electrical connection | 0,5m strong, flexible, shielded cable ø2,1mm (special lengths on request)
3 flexible, color-coded wires with Teflon insulation for extended temperature range |
| Values for analog DC output at UbN = 5 Volt |
| Sensitivity | approx. 12mV/degree | approx. 6mV/degree | approx. 3.6mV/degree |
| Temperature drift of sensitivity | -0,17% / K | -0,12% / K |
| Temperature drift of zero point | <±0,05mV/K | <±0,025mV/K |
| Zero offset at Ub=5V | (2,5±0,1)Volt - generally: 0,5Ub±4% |
| Output impedance | 10 kOhm |
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 NA3-30 NA4-45, NA4-70 | ±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.. |