Overview
Speed and Temperature The ST850 is a low-profile, retractable, thru-hull sensor that computes accurate speed and temperature data and sends it to any NMEA 0183 display or NMEA 2000 ® network.
These low-profile units are nearly flush, minimizing drag with only 5 mm (3/16″) extending outside of the hull.
The housing features a water valve which minimizes water ingress into the boat when the retractable insert is being replaced with the blanking plug. Airmar’s Smart ™ Sensors have embedded microelectronics. The signals from the speed and temperature sensors are processed right inside the housing itself. All that is needed to receive data is a single cable into a compatible network or display. Available as an analog sensor or a digital Smart Sensor that can output in NMEA 0183 or NMEA 2000 protocol.
Technical specifications
| Cable-Length | 6 m (20′) NMEA 2000® Cable |
|---|---|
| Common Use | Cruising/Racing Sailboats, Leisure/Yachting, Fishing |
| Data Rate | 1X per second |
| Functions | Speed, Temperature |
| Hole Size | 51 mm (2″) |
| Housing | Available in a plastic (P17) or bronze (B17) housing with water valve |
| Hull Material | Plastic: Fiberglass or metal, Bronze: Fiberglass or wood |
| Mounting Style | Low Profile Thru-Hull |
| Power Rating | N/A |
| Product Family | Marine |
| Protocol Output | NMEA 2000® |
| Pulses | 17,000 p/nm* (4.8 Hz per knot)—*p/nm = pulses per nautical mile |
| Retractable housing | Yes |
| Retrofits | Retrofits into B617V, P617V, SS617V, P217, P314 or ST650 housing |
| Speed Range | 2 to 45 knots (2 to 52 MPH) |
| Speed Type | Paddlewheel |
| Temperature Accuracy | ±0.5°C (±1.8°F) |
| Tilted Element | No |
| Usable Shaft Length | 57 mm (2.25″) |
| Voltage | 9 to 16 VDC |
| Water Temperature | -10° To 40°C (14° to 104°F) |
| Weight | Plastic: 0.7 kg (1.4 lb.), Bronze: 1.3 kg (2.8 lb.) |
