Abstract: Vacuum monitoring apparatus which includes a control circuit having transducer means for sensing the vacuum levels in a system and generating output signals. The control circuit includes adjustment circuits which compare the transducer output with selectively variable reference signals for controlling indicator devices and an alarm circuit when the vacuum levels are at respective high, low and normal settings. An off adjustment circuit is provided for setting the vacuum level below which the alarm circuit is disabled. A time delay circuit disables the alarm circuit for a predetermined time delay to provide for measurement of the vacuum recovery rate for the system.