Line and ambient sensing thermostats are used for maintaining proper viscosity in process temperature control or freeze protection applications. Chromalox offers a wide variety of commercial and industrial thermostats for your heat trace application. Enclosure options include NEMA 4, 4X or 7 which may be wall or pipe mounted in either Ordinary or Hazardous areas. Choose from our standard, non-indicating, bulb and capillary designs up to our industry-leading, programmable, 30 Amp SSR power switching DTS-HAZ Series. The DTS-HAZ may be pipe or wall mounted and it employs a selectable Soft Start function, AC or DC alarms, large and bright 4-digit display, comes with an RTD sensor and it is suitable for either ordinary or Class I, Division 2 areas.