The 3-Space™ Watertight houses a 10-DOF inertial sensing system in an IP68-rated cast aluminum enclosure. Designed for maritime and outdoor use, it is ideal for unmanned vehicle navigation, robotic stabilization, motion monitoring, and impact analysis.
Dual auto-selecting accelerometers provide low-range sensing and high-range measurements up to ±320g. QGRAD3 and selectable Extended Kalman filtering offer update rates up to 2,000 Hz, and the onboard World Magnetic Model provides tilt-compensated heading referenced to true, magnetic, or grid north.
The enclosure accommodates screwdown or strapdown mounting and incorporates a locking watertight connector. Both models provide USB connectivity, with 3.3V UART on the HU1 or RS232 on the HU2. Compatible watertight cables are required and sold separately in standard 2-meter and 4-meter lengths, with custom lengths available on request.
Specifications:
| Dimensions | 59 x 95 x 35 mm |
| Weight | 158 g |
| Supply voltage | 3.3–6.0 V |
| Current consumption | 75 mA at 5 V, full performance |
| Interfaces | HU1: USB 2.0 and 3.3V UART; HU2: USB 2.0 and RS232 |
| Ingress protection | IP68 |
| Filter update rate | Up to 2,000 Hz (QGRAD3, Kalman AHRS, or IMU mode) |
| Dynamic orientation accuracy | ±1° (average when calibrated) |
| Orientation range | 360° about all axes |
| Accelerometer ranges | ±2 / ±4 / ±8 / ±16g; ±32 / ±64 / ±128 / ±256 / ±320g |
| Gyroscope ranges | ±250 / ±500 / ±1,000 / ±2,000 / ±4,000°/s |
| Gyroscope bias stability | 1.5°/hr (average across axes at 25°C) |
| Orientation outputs | Quaternion, Euler angles, rotation matrix, axis angle, two-vector |
| Shock survivability | 5,000g |
Maximum sensor update rates depend on communication and filter settings.
