6 ST 800 Pressure Transmitter User’s Manual Revision 15
2.1.3 Safety Integrity Level (SIL)
The ST800 is intended to achieve sufficient integrity against systematic errors by the manufacturer’s
design. 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 the end user or diverse technology
redundancy in the design. Refer to the ST 800 & ST 700 Safety Manual, #34-ST-25-37, for additional
information.
2.1.4 Plugged Impulse Line detection (PILD)
STA, STD, STG, and STF800 models are offered with a PILD option which provide indication of a
plugged impulse line or process connection. When used in conjunction with a basic or advanced display, a
non-critical diagnostic indication appears on the integral display. For units without an integral display, an
indication can be seen via the host or handheld device when HART Protocol is utilized.
This diagnostic detects clogged or plugged impulse lines. Plugged impulse line detection (PILD) is based
on statistical models which continuously compare baseline, or normal, operating noise patterns to check
for statistically significant changes when one or both (DP) impulse lines become clogged.
See Section 5.6 for details on PILD option licensing.
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