Emerson Rosemount Volume 1, Quick Start Manual, Page: 10 / 32

5 Rosemount Series 68 Platinum RTD
5.1 Specifications
5.1.1 Performance specifications
Temperature range
–50 to 400 °C (–58 to 752 °F)
Effect of temperature cycling
±0.05 percent (0.13 °C or 0.23 °F) maximum ice-point resistance shift
following 10 cycles over the specified temperature range
Stability
±0.11 percent 0.28 °C or 0.51 °F maximum ice-point resistance shift
following 1,000 hours at maximum specified temperature (400 °C)
Maximum hysteresis
±0.1 percent of operating temperature range
Time constant
12 seconds maximum required to reach 63.2 percent sensor response in
water flowing at 3 ft/s (0.91 m/s)
Nominal R0 100 Ohm
Nominal alpha 0.00385 Ω/Ω °C
5.1.2 Physical specifications
Material selection
Emerson provides a variety of Rosemount product with various product
options and configurations including materials of construction that can be
expected to perform well in a wide range of applications. The Rosemount
product information presented is intended as a guide for the purchaser to
make an appropriate selection for the application. It is the purchaser’s sole
responsibility to make a careful analysis of all process parameters (such as all
chemical components, temperature, pressure, flow rate, abrasives,
contaminants, etc.), when specifying product, materials, options and
components for the particular application. Emerson is not in a position to
evaluate or guarantee the compatibility of the process fluid or other process
parameters with the product, options, configuration or materials of
construction selected.
Sheath material
316 SST and 321 SST
Quick Start Guide March 2021
10 Emerson.com/Rosemount