Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 20m Cable
Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 20m Cable — Product description
Precision Speed and Temperature Sensing for Serious Boaters
Upgrade your vessel's instrumentation with the Raymarine ST900, a thru-hull sensor that delivers unmatched accuracy in speed and water temperature readings. Designed for sailors and powerboaters who demand reliability, this low-profile plastic housing integrates seamlessly into your hull, providing real-time data to enhance navigation and performance tracking. Whether you're racing, cruising, or fishing, the ST900's Gen2 paddlewheel technology ensures responsive startup—even at speeds as low as 0.3 knots—and smooth linearity up to 45 knots.
Key Advantages Over Traditional Sensors
- Superior Low-Speed Performance: Starts delivering precise data from just 0.3 knots, ideal for light-wind sailing conditions where every knot counts.
- Minimal Drag Design: Only 5 mm protrudes outside the hull, reducing resistance and maintaining your boat's hydrodynamic efficiency.
- Integrated Water Valve: Allows safe paddlewheel removal for cleaning without flooding the bilge, simplifying maintenance during long voyages.
- Fast-Response Temperature: Captures water temp changes with ±0.5°C accuracy across a wide range (-10°C to 40°C), perfect for optimizing engine performance or monitoring fishing zones.
Gen2 Paddlewheel: Industry-Leading Innovation
The heart of the ST900 is Airmar's next-generation Gen2 paddlewheel, engineered for exceptional sensitivity and linearity. Unlike older designs that falter at low speeds or top out prematurely, this paddlewheel excels across the full range—from gentle drifts to high-speed runs. Boaters report noticeably smoother speed logs on multifunction displays, leading to better tactical decisions in regattas or efficient fuel management on long passages.
Retrofit Compatibility for Easy Upgrades
Planning a sensor refresh? The ST900's retractable insert drops right into existing Airmar P120 or B120 housings, saving time and installation hassle. Its analog output integrates effortlessly with legacy Raymarine systems or third-party instruments, making it a smart choice for mixed setups.
Technical Specifications at a Glance
| Feature | Details |
|---|---|
| Cable Length | 20 meters |
| Sensing Functions | Speed and Temperature |
| Hull Hole Size | 51 mm (2 inches) |
| Housing Material | Plastic |
| Mounting Type | Low-Profile Thru-Hull |
| Output Protocol | Analog |
| Retractable Design | Yes, with valve |
| Speed Range | 0.3 to 45 knots (0.34 to 52 MPH / 0.55 to 83 KPH) |
| Temperature Accuracy | ±0.5°C (±1.8°F) |
| Operating Temperature Range | -10°C to 40°C (14°F to 104°F) |
Why Choose the ST900 for Your Boat?
Investing in the ST900 means gaining a sensor that punches above its weight in durability and precision. Its robust plastic housing withstands harsh marine environments, while the 20-meter cable offers flexible routing to your helm station. Regular paddlewheel maintenance is straightforward—simply retract the insert, clean away marine growth, and reseat it securely. This level of performance and ease has made it a favorite among competitive sailors and weekend adventurers alike, ensuring your speed and temp data is always spot-on for safer, faster boating.
Frequently Asked Questions
What makes the ST900's speed range better than other thru-hull sensors?
The Gen2 paddlewheel provides responsive readings from 0.3 knots up to 45 knots, offering superior low-speed startup and high-speed linearity compared to standard paddlewheels.
Is the ST900 suitable for retrofitting older housings?
Yes, it retrofits directly into Airmar P120 and B120 housings, allowing a simple upgrade without hull modifications.
How does the low-profile design benefit my boat's performance?
With only 5 mm extending outside the hull, it minimizes drag, which is crucial for racing sailboats or high-speed power vessels.
Does the housing prevent water from entering when servicing the sensor?
Absolutely—the built-in valve assembly seals the hull during paddlewheel removal, keeping your bilge dry.
What type of output does the ST900 provide?
It uses an analog output, compatible with most marine displays and instruments for straightforward integration.
Can this sensor handle extreme water temperatures?
Yes, it operates reliably from -10°C to 40°C (14°F to 104°F) with high accuracy of ±0.5°C.
What's included with the ST900?
The package includes the ST900 sensor with 20m cable, plus the plastic housing and mounting nut for complete installation.
Raymarine ST900 Speed and Temperature Low Profile Plastic Housing
Model: E70674- Speed and fast-response water-temperature
- Best-in-class speed range from 0.3 to 45 knots (.34 to 52 MPH/.55 to 83 KPH)
- Analog output
- Retractable insert in a low-profile plastic housing with a water valve
- ST900—Retrofits into Airmar P120 and B120 housings
Speed performance has been taken to the next level with the introduction of the ST900 Speed/Temperature sensor. Featuring the new Gen2 Paddlewheel, the ST900 out-performs all other paddlewheel sensors for responsive startup and linearity. The Gen2 Paddlewheel begins delivering accurate speed reporting as low as 0.3 knots and maintains smooth speed output through 45 knots.
These low-profile housings are nearly flush and minimize drag with only 5 mm (3/16"") extending outside the hull. The housing has a valve assembly that helps to minimize water ingress in the bilge when the sensor is removed for routine maintenance of the paddlewheel.
Airmar’s new, next-generation paddlewheel design delivers industry-leading performance for start-up responsiveness and linearity throughout the speed range. Gen2 paddlewheel maintains the top speed performance Airmar is known for and adds start-up speed performance that beats all other available paddlewheels. The Gen2 paddlewheel is the most sensitive and accurate paddlewheel available for sailing and power boats.
Specifications| Cable-Length | 20m |
| Functions | Speed, Temperature |
| Hole Size | 51 mm (2"") |
| Housing | Plastic |
| Mounting Style | Low Profile Thru-Hull |
| Protocol Output | Analog |
| Retractable housing | Yes |
| Retrofits | AIRMAR P120, B120 housings |
| Speed Range | 0.3 to 45 knots (.34 to 52 MPH/.55 to 83 KPH) |
| Temperature Accuracy | ±0.5°C (±1.8°F) |
| Water Temperature | -10° to 40°C (14° to 104°F) |
What's in the Box:
- ST900 with 20m Cable
- Plastic Housing and nut
SKU: NVN-1003634
MPN: E70674
UPC: 723193846957
Technical specifications
| Brand | Raymarine |
| Model | Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 20m Cable |
| SKU / MFR# | 1003634 |
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