Additional Information
| Weight | 12.34 oz |
|---|---|
| Dimensions | 9.25 × 1.55 in |
Little Dipper is an in-place inclinometer system for monitoring slopes, embankments, deep excavations, tunnels, tank foundations, retaining walls, and other types of ground movement. Installed as a string of vertical or horizontal sensors inside inclinometer casing, or by direct burial, this instrument provides a continuous record of ground displacement. Fiberglass rods connect the sensors inside the casing, and fins or universal pivots couple the sensors to the casing walls. Little Dipper’s on-board electronics accept a wide input voltage range and drive long cables without signal loss. The waterproof and non-corrodible ABS sensor housing also makes the Little Dipper a popular tool for underwater tilt measurements in shallow marine applications. Select analog voltage output (biaxial) or 4-20 mA output (uniaxial only).
Performance Specifications
| High-Gain | Standard | Wide-Angle | |
|---|---|---|---|
| Angular Range (°) | ±12 | ±30 | ±50 |
| Resolution (°)1 | <0.005 | <0.01 | <0.02 |
| Repeatability (°) | 0.01 | 0.02 | 0.02 |
| Scale Factor (°/V)2 | 4 | 10 | 25 |
| Non-linearity (%)3 | Full span: 0.8 | ½ span: 1 Full span: 4 | 7 |
| Output Voltage (V) | ±2.5 or 0-5 | ||
| Channels | X-tilt, Y-tilt, Temperature | ||
| Kz Coefficient (°/C, typical) | ±5 arcsec | ||
| Ks Coefficient (%/C, typical) | ±0.03 | ||
| Time Constant (seconds) | 0.15 | ||
| Natural Frequency (Hz) | 10 | ||
| Power | +8 to +24VDC; 7mA, 250mV ripple max, reverse polarity protected | ||
| Environmental | -25 to +70°C; Submersible to 72psi (5 bar); 100% humidity (non-condensing) | ||
| Materials | Cylindrical ABS housing, Delrin (guide fins) | ||
| Cable4 | 6-conductor, 24 AWG, PVC jacket, polypropylene insulation, overall shield, 0.2 in. (5mm) diameter, 3m cable included. | ||
Notes:
1: Resolution calculated at 1mV.
2: Linear scale factor calculated from BFSL through calibration curve.
3: Linearity calculated as max % deviation from BFSL. 0.05% linearity achievable using a polynomial.
4: For additional cable lengths, please specify on order (price per ft.).
*Specifications subject to change without notice on account of continued product development
Downloads
| Datasheet |
| User Manual |
| Outline Drawing |
