Wellmark 790-SF-1A-E19 Horizontal 2" NPT Float Switch

The Wellmark 790-SF-1A-E19 is a robust horizontal float switch designed for reliable liquid level detection in industrial applications such as oil and gas tanks, chemical processing vessels, and water treatment systems. Manufactured by Wellmark (a division of CEMCO-MAJOR), this switch utilizes a buoyant float attached to a stem that activates an internal switch mechanism when liquid levels reach predetermined points, providing on/off control for pumps, alarms, or valves. Key features include a stainless steel construction for corrosion resistance, 2" NPT process connection for easy installation, and hazardous location certifications (CSA Class I Groups C&D, Class II Groups E, F&G, Class III Type 4X) making it suitable for explosive environments. Advantages over similar products include high pressure rating up to 1500 PSI, compact design for tight spaces, and simple mechanical operation that requires no external power for the float mechanism, reducing maintenance needs. However, drawbacks may include limited maximum ambient temperature of 40°C, which restricts use in high-heat environments, and the need for periodic cleaning in dirty fluids to prevent float sticking. This model excels in durability and reliability, offering better value in demanding settings compared to electronic sensors that may fail in harsh conditions. Overall, it's ideal for applications requiring precise, fail-safe level monitoring with minimal electronics.