ASCO TD20A11 Transducer

ASCO TD20A11 Transducer is a 1.0–18 psi pressure-to-electrical transducer unit designed for use with ASCO S-Series pressure switches. The part number is TD20A11, and it functions as the transducer component in the two-piece S-Series switch assembly (paired with the corresponding switch body). When pressure is applied to the transducer, it generates an electrical signal that the control or safety circuitry can monitor for burner or gas-appliance applications. This model is commonly referenced in ASCO documentation as a replacement transducer for the S-Series line, with TA31A11 listed as a related replacement transducer. Some retailers label TD20A11 as obsolete, reflecting the product’s age and availability of newer transducer options within the ASCO family. For installation, connect the transducer to the pressure source and integrate its electrical output with the system’s control circuit, ensuring the interface matches your equipment’s voltage/current requirements and that mounting and connections remain leak-free in combustion-control environments.