The Pulsarpoint 300 series is a range of rotating paddle level switches for point level switching of bulk solids. The paddle's rotation is interrupted when material reaches the paddle, causing a clutch to disengage the motor. This in turn actuates a relay allowing an alarm signal to be switched, which may be used to signify a material level as being high, intermediate or low depending on configuration chosen. Pulsarpoint 300 datasheet and manuals.