ABB TTR200 Operations Instructions download pdf (Page 6)

Acronyms and abbreviations

6 TTH200, TTR200, TTH300, TTF300, TTF350 SM/TTX200/TTX300/SIL-EN

Acronym/

Abbrevia-

tion

English Description

closed coupled Short connecting lead to the temperature sensor, less

than 1 m (39.37 inches) in length and connecting lead

laid with mechanical protection.

extension wire Long connecting lead to the temperature sensor, more

than 1 m (39.37 inches) in length or connecting lead laid

without mechanical protection.

low stress Low to medium load according to data sheet

specification (sensor exposed to temperature and

mechanical load)

high stress High load according to data sheet specification (sensor

exposed to temperature and mechanical load)

Single

Configuration

Single configuration, i.e. use of one transmitter per

measuring point. This results in an HFT = 0 (1oo1

architecture) for corresponding SIL2.

Dual Configuration Dual configuration, i.e. use of two transmitters per

measuring point. In this configuration the two current

signals 4 … 20 mA have to be evaluated accordingly by

the downstream logics unit

(a DCS, for example). This results in an HFT = 1 (1oo2

architecture) for corresponding SIL3.

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ABB TTR200 Operations Instructions Page 6