Emerson Rosemount Volume 1, Quick Start Manual, Page: 18 / 32

8 Rosemount Series 68Q Sanitary Platinum RTD
8.1 Specifications
8.1.1 Performance specifications
Temperature range
–50 to 200 °C (–58 to 392 °F)
Maximum hysteresis
±0.09 percent of operating temperature range
Stability
Tri Clamp O.D. tube size 1-in. and greater
±0.04 percent maximum ice-point resistance shift following 1,000 hours at
maximum specified temperature 392 °F (200 °C)
Tri Clamp O.D. tube size
½
- to
¾
-in.
±0.08 percent maximum ice-point resistance shift following 1,000 hours at
maximum specified temperature 392 °F (200 °C)
Response time
Tri Clamp O.D. tube size 1-in. and greater
Less than 3.5 seconds required to reach 63.2 percent sensor response in
water flowing at 3 ft/s (0.91 m/s). Meets PMO specification.
Tri Clamp O.D. tube size
½
- to
¾
-in.
Less than 1.5 seconds required to reach 63.2 percent sensor response in
water flowing at 3 ft/s (0.91 m/s).
Insulation Resistance
500
×
10
6
ohms minimum insulation resistance when measured at 100 Vdc
at room temperature
Surface Finish
32R
A
standard finish on product contact surfaces. Meets 3A requirements.
15R
A
high mechanical polish available with option code HP.
8.1.2 Environmental specifications
Humidity limits
Lead seal is capable of withstanding 100 percent relative humidity.
Quick Start Guide March 2021
18 Emerson.com/Rosemount