804-805 / 1145
DEVICE RESPONSE TIME - Challenges
• Response times of some devices difficult to predict
o
Thermowell
o
Capillary
• Supplier guarantee difficult to obtain
• Specific test conditions for response time may differ
from actual process conditions
• Sometimes can only be verified during functional
testing
Slide 15
Challenges in Achieving Safety Instrumented Function Response Time for a Fast-Acting Process• K. Rampaul, A.
Barnwell & S. Sookhoo