Find below an example of an installed Qolsys water sensor. The lower section is the actual water sensor while the upper section is the battery/transmitter. Click the image to see a larger version of the image.
Below is a chart of the various sensors used with Qolsys systems (predominantly IQ & IQ2 series alarm systems). Included is the Sensor Type (primary use), Part #/Description (mostly used by dealers), Voltage, Type (of battery used), Quantity ...