The station display can beep for a couple reasons. One is batteries in a sensor or a failing sensor. If one of the sensors has failing batteries, even though there is no battery icon on the display it could cause the sensor to lose and regain connection to the display causing it to beep.
Remove the batteries from each sensor, one at a time until the display ceases to beep, giving the display enough time to beep after each sensor has it's batteries removed.
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