www.miinet.com
Moore Industries-International, Inc.
- 66 -
User’s Manual
225-748-01L
February 2017
Programmable Current/Voltage Safety Trip Alarm
STA
HLPRG
SEC
TION 7
Operation and Maintenance
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: 700-702-32).
The proof tests described in Table 7.1 and Table 7.2 are designed to cover all possible
dangerous undetected faults that can be detected without opening the unit (proof test coverage
is 97%). Periodically testing the STA, using the proof test steps outlined below, the accumulated
PFD
AVG
value can be reduced to a smaller but non-zero 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 STA is not intended to be repaired on site and has no components needing maintenance
or regular replacement. On device failure, the STA 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 STA 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 STA 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.
