www.miinet.com
Moore Industries-International, Inc.
- 121 -
User’s Manual
238-760-00K
May 2019
Functional Safety Dual Input Smart HART® Temperature Transmitter
STZ
SECTION 7
Proof Test Procedure
It is normal practice with SIS that the components undergo periodic proof tests to expose
dangerous faults that are not detected by internal diagnostic tests. Thus, this section specifies
how the dangerous undetected faults determined during the FMEDA can be detected during
proof testing.
Calculation of the required proof test interval can be made using data in the FMEDA report
(Moore Industries’ Document No: 700-702-39).
The proof tests described here are designed to cover all possible dangerous undetected faults
that can be detected without opening the case. There are 2 tables which provide proof tests
using HART or the USB connection cable with MISP DTM. HART mode must be set to Full
Access (default) or Read Only to use the HART proof tests.
Proof test coverage achieved with these tests for the particular application is 83-87%.
Periodically testing the STZ using the proof test steps outlined below, the accumulated PFD
AVG
value can be reduced to a smaller but nonzero value. To completely test for all possible
dangerous undetected faults, the unit must be sent back to the factory for a comprehensive proof
test inspection.
Repair and Replacement
The STZ is not intended to be repaired on site and has no components needing maintenance
or regular replacement. On device failure, the STZ should be returned to Moore Industries
Worldwide Headquarters in North Hills, CA 91343 U.S.A for repair and refurbishment (refer to
Returns Procedures at the end of this manual). The STZ is a certified Safety component. Repair
or replacement of any component without authorization from Moore Industries International, Inc.
will invalidate any remaining warranty and the IEC61508 certification.
Recording and Reporting of STZ Performance
It is the end user’s responsibility to maintain records of all safety component failures, especially
those that might be classified as potentially dangerous. This feedback data not only helps
the supplier identify and rectify reliability issues but also to provide quantitative data to
increase confidence in the FMEDA analysis of dangerous failure rates. Please ensure that any
components returned to Moore Industries International, Inc. are returned with a clear report
identifying the fault experienced.