ABB TTH200 Additional Instructions

TTH200, TTR200, TTF200 Temperature transmitter Additional instructions for IEC 61508 compliant devices Measurement made easy — TTH200 TTR200 TTF200 Introduction TTH200, TTR200, TTF200 electronics for sensor- head, field and rail mounting for standard and high measurement. This document must be considered ...

Table of contents 1� Application area .......................................................................................... 3� 2� Purpose ........................................................................................................ 3� 3� Terms and definiti ...

3 1 Application area The TTH200, TTR200, TTF200 *H Series temperature transmitter are 2-wire 4 to 20 mA devices for the temperature monitoring of solids, fluids and gases of all types in containers and piping. Combined with a temperature sensor, the temperature transmitter become a t ...

3 Terms and definitions IEC 61508 International standard ‘Functional safety of electrical/electronic/programmable electronic safety-related systems’. Safety integrity� Probability of a safety system satisfactorily performing the specified safety functions under all the stated ...

5 Mission Time Final plant operation time for the safety system. Used for the PFDAVG and Proof Test Interval calculation. FMEDA Failure Modes, Effects and Diagnostics Analysis. MTBF Mean Time Between Failure. MTBF = (1 / (� total + � AU + � no effect + � no part)) + MTTR. MTT ...

5 Safety function The TTH200-*H, TTR200-*H, and TTF200-*H transmitter are configurable single sensor channel (1 x RTD 2/3/4 wire, 1 x TC) digital devices generating a temperature related analog 4 to 20 mA output signal. The safety function refers strictly to the analog output signa ...

7 Useful Lifetime According IEC 61508-2, a useful lifetime, based on experience, should be assumed. The useful lifetime is highly dependent on the component itself and its operating conditions – temperature in particular. Beyond the useful lifetime, the result of the probabilistic ...

6 Constraints The following constraints on the use of the compliant item needs to be considered: • The entire valid range for the output signal must be configured between min. 3.8 mA and max. 20.5 mA (factory setting). • The HART communication master must comply with the safety ...

9 7 Periodic proof test and maintenance According IEC 61508-2 proof tests shall be undertaken to reveal dangerous faults which are undetected by automatic diagnostic tests. The End User is responsible for selecting the type and the intervals according the overall safety system demand ...

8 Installation, commissioning & configuration The transmitter can be installed, configured, commissioned and maintained by personal with trained knowledge of temperature transmitters in general and the specific knowledge of the applicable documents content referenced within this s ...