Functional safety
7.1 General safety information
SITRANS TH200/TH300
38
Operating Instructions, 06/2010, A5E00393069-03
According to IEC 61511-1, Section 11.4.4, the hardware fault tolerance (HFT) can be
reduced by one (values in brackets) for sensors and final controlling elements with complex
components if the following conditions are applicable for the device:
● The device is proven-in-use.
● The user can configure only the process-related parameters, e.g. control range, signal
direction in case of a fault, limiting values, etc.
● The configuration level of the firmware is blocked against unauthorized operation.
● The function requires SIL of less than 4.
The device fulfills these conditions.
Содержание SITRANS T4200
Страница 7: ...Table of contents SITRANS TH200 TH300 6 Operating Instructions 06 2010 A5E00393069 03 ...
Страница 13: ...General safety notes 2 5 Precautions SITRANS TH200 TH300 12 Operating Instructions 06 2010 A5E00393069 03 ...
Страница 45: ...Commissioning 8 2 LED operating indicator SITRANS TH200 TH300 44 Operating Instructions 06 2010 A5E00393069 03 ...
Страница 71: ...Service and maintenance SITRANS TH200 TH300 70 Operating Instructions 06 2010 A5E00393069 03 ...
Страница 85: ...Spare parts and accessories SITRANS TH200 TH300 84 Operating Instructions 06 2010 A5E00393069 03 ...
Страница 88: ...Appendix A 2 Control drawing SITRANS TH200 TH300 Operating Instructions 06 2010 A5E00393069 03 87 ...
Страница 91: ...List of abbreviations B 1 Abbreviations SITRANS TH200 TH300 90 Operating Instructions 06 2010 A5E00393069 03 ...
Страница 97: ...Glossary SITRANS TH200 TH300 96 Operating Instructions 06 2010 A5E00393069 03 ...