ASCO S-Series temperature switches consist of a switch unit and a transducer unit.

They can be ordered separately for customer stocking and/or field assembly or as a complete factory-assembled unit.

S-Series temperature switch units incorporate the unique ASCO TRI-POINT alternating fulcrum balance plate to control the operation of one or more electrical snap-action swtiches. The electrical snap-action switch together with the adjusting mechanism is a fully-tested, self-contained subassembly.

The temperature transducer unit uses a vapor pressure principle where the internal pressure within the unit is generated by the vapor pressure of a chemical within a sealed system.

Temperature transducers are available in two constructions, a direct mount or capillary and bulb construction. The direct mount unit includes a 1/2” NPT connection for direct mounting to the process.

The capillary and bulb construction allows remote mounting from the process.

The transducer unit (like the switch unit) is a fully-tested, self-contained subassembly. Temperature sensed by the bulb creates an internal pressure within the transducer. This pressure is then converted into movement of the piston. This piston movement is then used to control the operation of the electrical snap-action switch in the switch unit.