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    Watlow® offers several styles of sensors for use with flexible heaters. These sensors are available as preset or adjustable thermostats, thermocouples, thermistors, RTDs or thermal fuses. They can be integrally mounted (encapsulated in silicone rubber) to sense the temperature of either the part or the heater sheath. The thermostats can also be ordered separate from the heater, allowing direct control of your process temperature, if desired. WATLOW® 531 Thermostats and Accessories ST10 and ST207 Temperature Sensors. T-10 thermostats are manufactured for specific preset temperatures. Available in 25°F increments. Other temperature ranges and voltages are available on special order. Minimum quantities apply, contact your Watlow representative before ordering. When ordering a pre-set thermostat separate from the heater, simply add the prefix S to the model number. (Example: ST-10) Snap action preset temperatures on the T-207 are close/open settings. Pre-Set Thermostat Several styles of non-adjustable, pre-set thermostats are available from Watlow. Thermostats separate from the heater are encapsulated in silicone rubber, and are available with standard 12 in. (305 mm) leads unless otherwise specified. Thermocouples, thermistors, RTDs and thermal fuses are usually mounted to the heater under a vulcanized protective cap of silicone rubber sheath material. This drawing shows a typical mounting style for a thermocouple.