The Solenoid is a normally closed shutoff valve that is held open by the AerosphereTM carbon dioxide monitoring system. In the case that there may be a leak in carbon dioxide, the Solenoid will shut-off the supply of gas at the carbon dioxide tank (Dewar tank). This valve may be programmed to operate at any alarm level.
Many jurisdictions require the use of a Solenoid valve to shut-off the gas tank in the event of a high-level alarm condition. For example, a beverage dispensing system will typically require a shut-off valve at 30,000 ppm or 3%, while a grow house will typically require a shut-off valve at 5,000 ppm or 0.5%.