The Supply Line Shut-off Solenoid is a normally closed shutoff valve that is held open by the Aerosphere® Carbon Dioxide Monitoring System. In instances where a leak is detected, the Solenoid will shut-off the supply of gas (fail-safe) at the CO2 tank (Dewar tank). This valve may be programmed to operate at any alarm level. Cable is 26".
 
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 restaurant (or an insulated 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%.