Integrated Flow switch:

The VMUS-DG uses an integrated flow switch for simple and reliable automation. This switch will turn the ozone generator ON when feed-gas flow rises above about 1.5 LPM, and turn the ozone generator OFF when feed-gas flow drops below about 1 LPM. This provides some simple automation for your ozone system. When used with a simple venturi injector the VMUS-DG will turn ON and OFF automatically based on suction from the venturi. When used with an oxygen generator the VMUS will turn ON and OFF automatically when flow starts or stops from the oxygen generator. This feature eliminates the need for external wiring or flow/pressure switches.

When the ozone generator is turned OFF due to no flow, the No Flow light illuminates indicating this. When flow is present this No Flow light will go out, and the blue Ozone light will illuminate, indicating ozone is now produced.