In the context of the Fly Henry and IFD-NET systems you've been asking about, a "water sensor" (more accurately a coolant temperature sensor) is a resistive or thermocouple-based probe designed to monitor the liquid cooling system of your engine (most commonly the Rotax 912 or 582 series).
1. Fly Henry Water Sensor
Fly Henry produces specific sensors designed for their PPG Meter and Fly Meter units. These are typically NTC (Negative Temperature Coefficient) thermistors.
Thread Options: They are available in several metric sizes to fit different engine ports:
M6 x 1.0mm
M8 x 1.0mm
M10 x 1.0mm (Commonly used on certain 2-stroke cylinder heads)
Design Variants:
"Old Model": Features a very short lead (approx. 5cm) requiring an extension cable.
"New Model": Features a 50cm or 80cm black wire with a pre-installed connector for the Fly Henry measuring module.
Temperature Range: Specifically calibrated for liquid cooling, typically measuring from 0°C to 125°C.
