Airmar ST850 Plastic Thru Hull Transducer

Accurate speed and temperature reading

The Airmar ST850 Plastic Thru Hull Transducer is Airmar's standard, thru-hull speed sensor. Digital signal processing inside the housing provides speed and temperature data to a chartplotter, radar screen, or digital display in either analog or NMEA 2000 formats.

Minimise Your Drag
The plastic low-profile housing is nearly flush and minimises drag with only 5 mm (3/16inch) extending outside the hull.

Eliminate Turbulence
The plastic P217 and bronze B119 countersunk flush outer housings are easy-to-install. The plastic P314 and bronze B21 outer housing options have a traditional beveled-edge for flush mounting. Flush-mount housings eliminate turbulence for accurate readings at high-speeds. They are the optimal choice for installation in racing sailboats and high-speed powerboats.

Airmar ST850 Plastic Thru Hull Transducer Features:

• Speed and temperature
  
• NMEA 2000 or Analog output options
  
• Retractable plastic with valve sleeve
  
• Retrofits into Airmar P17 and B17 housings
  
• 6 m (20ft) NMEA 2000 cable, 9 m (30ft) Analog cable
  
• Devicenet connector or NMEA 2000 version
  
• Speed Range: 2 knots to 45 knots (2 MPH to 52 MPH)
  

• Weight: 0.7kg (1.4lb)
  
• Speed range: 2 knots to 45 knots (2mph to 52mph)
  
• Acoustic window: Urethane
  
• Hull deadrise: Up to 22°
  
• Data update rate: 1 per second
  
• Pressure rating: 3m (10ft)
  
• Pulse rate: 17,000 p/nm* (4.8 Hz per knot)—*p/nm = pulses per nautical mile
  
• Supply voltage: 9 VDC to 16 VDC
  
• Supply current: <200 mA
  
• Standard cable length: 6m (20ft) NMEA 2000 cable, 9m (30ft) Analog
  
• Temperature Sensor Accuracy: ±0.5°C (±1.8°F)
  
• Temperature Sensor Range: -10°C to 40°C (14°F to 104°F)
  
• NMEA 2000 Load Equivalency Number (LEN): 2
  
• CE Regulation: Complies to IERC60945
  
• Dimensions:
  Diameter: 75mm