Installation, Commissioning & Configuration; Activating / Deactivating Write Protection; Check Write Protection; Sensor Redundancy With Drift Detection - ABB TTH300 User Manual

10 TTH300, TTF300 TEMPERATURE TRANSMITTER | SM/TTX300/SIL-EN REV. E
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 safety manual.
The device has been configured and tested according to customer order. However, it can be configured via DTM / FDI / EDD through
the HART interface. The parameters are described in the product instructions.
All configuration parameters that are changed may affect the safety function of the device. Therefore, the safety function shall be
checked again after modifications in accordance to the recommended proof tests.

Activating / Deactivating write protection

• TTH300/TTF300 via DTM/FDI/EDD or local LCD display 'Write Protection'
• TTH300/TTF300 additionally via HW- write protection DIP switches
(for details see the operating instruction).

Check write protection

Write protection could be checked as follows:
• Check whether the lock icon is displayed on the LCD display if mounted.
• Modify a parameter (e.g., damping), save device data in device and check whether the message 'Device is write-protected' is
displayed.
Note
The software write protection does not lock again automatically. It remains unlocked until it is specifically activated.

Sensor redundancy with drift detection

The dual sensor redundancy with configured drift detection and alarm current output configuration (2 temperature sensors
connected to one electronics) is able to detect and alarm signaling on around 95 % on the normally undetected sensor failures.
The related failure rates on sensor assembly configurations are listed within the related tables of 'Appendix Exida FMEDA Report'.
Configuration:
The sensor drift monitoring needs to be activated and configured via DTM or FDI as demanded for the sensor assembly.
The current output alarm behavior on the 'maintenance required' event from detected sensor drift failures needs to be configured as
demanded for the safety logic solver.
Refer to the related operating instructions on more details.

Check sensor redundancy with drift detection

It is mandatory demanded to verify the sensor drift failure detection functionality for the final application including logic solver
involvement.