with the cleaning function is a bypass or cleaning loop 80 having a normally open third solenoid valve 82 which is operated by the controller 40 and a check valve 84 which is in fluid communication with the outlet of the third solenoid valve 82 a normally closed fourth solenoid valve 86 is also operated by the controller 40 and opens to dump fluid containing the concentrated cleaner or any other fluid within the coolant and lubricant monitoring assembly 30 to a waste vessel 88 operation of the coolant and lubricant monitoring assembly 30 in both operating i e monitoring mode and cleaning mode will now be described the first solenoid valve 38 is normally closed and when activated receives cooling and lubricating fluid 16 in the line 26 from the external system simultaneously the second normally closed solenoid valve 58 is also activated providing an outlet for the incoming fluid 16 pressure of the supplied cooling and lubricating fluid 16 is monitored by the first pressure gauge 36 with the normally open third solenoid valve 82 deactivated fluid 16 readily flows through the bypass or cleaning loop 80 for a timed interval flushing and displacing whatever fluid the bypass or cleaning loop 80 previously contained when the above flushing interval is complete the normally open third solenoid valve 82 is activated and closes the bypass or cleaning loop 80 this action directs all incoming fluid 16 to the high.