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STT850 Temperature Transmitter User’s Manual
Revision 3
Table 3
– STT850 Standard Diagnostics Messages
Critical Diagnostics
(Failure Conditions)
Non-Critical Diagnostics (Warning Conditions)
Temperature Sensor Module
Failure
Excess Cal 1 Correct
(Excess LRV Correct and/or Span correct for Sensor Input 1)
Sensor Input 1 Failure
Excess Cal 2 correct
(Excess LRV Correct and/or Span correct for Sensor Input 2)
Sensor Input 2 Failure
Input 1 Out of Range
(Sensor Input 1 Under Range or Over Range)
Communication Module Failure
Input 2 Out of Range
(Sensor Input 2 Under Range or Over Range)
Sensor Comm. Timeout
Sensor Module Over Temperature
Cold Junction Out of Range Error
Sensor Input 1 Open
Sensor Input 1 TB5 Open
Sensor Input 1 TB6 Open
Sensor Input 1 TB7 Open
Sensor Input 1 TB9 Open
Sensor Input 2 Open
Sensor Input 2 TB8 Open
No Factory Calibration
Supply voltage Fault
(External Supply voltage Fail)
Communication Module Over Temperature
No DAC compensation
Unreliable communication between Sensor and Comm
Modules
Display NVM fault
Excess Delta
Internal Power failure for Communication Module
2.1.3 Safety Integrity Level (SIL)
The STT850 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
STT850 Safety Manual
, 34-TT-25-05, for additional
information. The Fieldbus variant of STT850 is not SIL certified.
Содержание STT850 SMARTLINE
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