ORI-652 Jupiter
®
Model JM4 Magnetostrictive Transmitter – SIL Safety Manual
5
Overvoltage Category II is a local level, covering appliances, por-
table equipment, etc., with smaller, transient overvoltages than
those characteristic of Overvoltage Category III. This category
applies from the wall plug to the power-supply isolation barrier
(transformer).
As the typical plant environment is Overvoltage Category II,
most equipment evaluated to the requirements of IEC/EN
61010 are considered to belong in that classification.
3.0 Mean Time To Restoration (MTTR)
SIL determinations are based on a number of factors including
the Mean Time To Restoration (MTTR). The analysis for the
JUPITER Model JM4 is based on a MTTR of 24 hours.
4.0 Supplementary Documentation
• The JUPITER Model JM4 Installation and Operating Manual
ORI-650 must be available to ensure proper installation of the
transmitter.
• One of the following Electronic Device Description Files is also
required if HART is used:
• Manufacturer Code 56 (hex)
• Model JM4 Device ID 56DF (hex), device revision 1, DD
revision 1.
• For device installations in a classified area, the relevant safety
instructions and electrical codes must be followed
5.0 General Instructions
5.1
Systematic Limitations
The following instructions must be observed to avoid systematic
failures.
5.1.1 Application
Choosing the proper accessories and options for the JUPITER
Model JM4 transmitter is an important decision in the
application process. High temperature and cryogenic probes
are available for extreme temperature situations. Vibration
absorption kits are also available for high vibration applications.
As the probe configuration establishes fundamental performance
characteristics, the probe for use with the JUPITER Model JM4
must be carefully selected. Appropriate selection of Probe design
and materials as well as float characteristics and material will
assure reliable operation. Refer to Installation and Operating
Manual ORI-650 for more information on selecting the proper
options for each specific application.
