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Rosemount™ 78 RTD Temperature Sensor (Obsolete)
This product is now obsolete.
Relevant documents and drawings are listed below.
Contact your local Emerson representative for your measurement needs.
Rosemount™ 78 RTD Temperature Sensor (Obsolete)


Lead Wires
For single and dual-element, PTFE-insulated, nickel-coated, 22-gauge stranded copper wire; for single-element high-temperature, see full specs
Time Constant / Response
For single and dual-element, 4 seconds maximum required to reach 63.2% sensor response in water flowing at 3 ft/s (0.91 m/s)
For single-element high-temperature, see full specs
±0.05% maximum ice-point resistance shift following 1,000 hours at 400 °C (752 °F)
Insulation Resistance
500 x 10^6 ohms minimum insulation resistance when measured at 500 Vdc at room temperature (20 °C [68 °F])
Calibration Options
IEC 751 Class A accuracy; Calibration schedule or customer-specified calibration range, both with Callendar-van Dusen constants


  • Wire-wound design for applications subjected to high temperatures or requiring high accuracy or dual elements
  • Covers temperatures from –328 to 1112°F (–200 to 600°C) for application durability
  • Offers a range of enclosure and connection head options to meet diverse application requirements
  • Available in capsule, general purpose, spring-loaded and bayonet spring-loaded design for adaptability
  • Optional Class A accuracy for critical temperature measurement points
  • Callendar-Van Dusen constants allow user to match the sensor to the transmitter for notable performance improvement
  • Thermowell available in a variety of materials and process connections for protection from corrosive environments
  • Global hazardous location approvals meet local requirements


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