Can anybody help me to understand at what all occasions beep sounds are produced by the common air inflating machines at the fuel stations? During operation, I heard multiple beeps not sure when are they produced. What I am aware is - 1. If any error occurs during operation the machine produces a beep. 2. On successfully setting the tyre pressure the machine produces a beep. I heard one beep during operation but it was neither an error nor at successfully setting the pressure. Can you share when other beep sounds are produced?