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 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.
 
  - 
  Speed and fast-response water-temperature sensing
 
  - 
  Speed range: 2 to 45 knots (2 to 52 MPH)
 
  - 
  NMEA 2000 protocol
 
  - 
  Retractable insert in a low-profile housing with a water valve
 
  - 
  Available in a plastic (P17) or bronze (B17) housing
 
  - 
  Retrofits into B617V, P617V, SS617V, P217, P314, or ST650 housing
 
  - 
  NMEA 2000 certified cable
 
 
  
  Brand: Airmar 
  Technology
  
  Cable-Length: 6 
  m (20') NMEA 2000® cable, 6 m (20')
  
  Comm Method: NMEA 
  2000®
  
  Common Use: Cruising/Racing 
  Sailboats, Leisure/Yachting, Fishing
  
  Country of Origin: USA
  
  Data Rate: 1X 
  per second
  
  Display Connector: N2 
  Micro
  
  Functions: Speed, 
  Temperature
  
  Hole Size: 51 
  mm (2")
  
  Hull Material: All 
  hull materials
  
  Material: Stainless 
  Steel
  
  Mounting Style: Low 
  Profile Thru-Hull
  
  Power Rating: N/A
  
  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)
  
  Temperature Accuracy: ±0.5°C 
  (±1.8°F)
  
  Tilted Element: No
  
  Usable Shaft Length: 55 
  mm (2.15")
  
  Voltage: 9 
  to 16 VDC
  
  Water Temperature: -10° 
  to 40°C (14° to 104°F)
  
  Weight: 1.3 
  kg (2.8 lb.)