Safety Function; Primary Safety Functions; Secondary Safety Functions; Systematic Integrity: Sil 3 Capable - Honeywell HART STT700 Safety Manual

Primary Safety Functions

The HONEYWELL STT700 measures the temperature (or mV or ohms) of a process and reports
the measurement within a safety accuracy of 2%.

Secondary Safety Functions

The HONEYWELL STT700 performs automatic diagnostics to detect internal failures and
reports these failures via out-of-band signals on the 4 – 20 mA output.
The transmitter needs a power cycle in order to recover from this condition.

Systematic Integrity: SIL 3 Capable

SIL 3 Capability:
The product has met manufacturer design process requirements of Safety Integrity Level (SIL) 3.
These are intended to achieve sufficient integrity against systematic errors of design by the
manufacturer. A Safety Instrumented Function (SIF) designed with this product must not be used
at a SIL level higher than the statement without "prior use" justification by end user or diverse
technology redundancy in the design. This is a Type B device.
2
2 — Safety Function
STT700 Safety Manual June 2017