DRAFT - 26 March 2015
DRAFT - 26 March 2015
SM45-55-SAD Rev 3
9
8
5 Installation
There are two particular aspects of safety that must be considered when installing the MTL4500 or MTL5500
modules and these are:
• Functional safety
• Intrinsic safety
Reference must be made to the relevant sections within the instruction manual for MTL4500 range (INM4500)
or MTL5500 range (INM5500) which contain basic guides for the installation of the interface equipment to meet
the requirements of intrinsic safety. In many countries there are specific codes of practice, together with industry
guidelines, which must also be adhered to.
Provided that these installation requirements are followed then there are no additional factors to meet the needs
of applying the products for functional safety use.
To guard against the effects of dust and water the modules should be mounted in an enclosure providing at
least IP54 protection degree, or the location of mounting should provide equivalent protection such as inside an
equipment cabinet.
In applications using MTL4500 range, where the environment has a high humidity, the mounting backplanes
should be specified to include conformal coating.
6 Maintenance
To follow the guidelines pertaining to operation and maintenance of intrinsically safe equipment in a hazardous
area, yearly periodic audits of the installation are required by the various codes of practice.
In addition, proof-testing of the loop operation to conform with functional safety requirements should be carried
out at the intervals determined by safety case assessment.
Proof testing must be carried out according to the application requirements, but it is recommended that this be
carried out at least once every three years.
Refer to Appendix B (Clause 7.2) for the proof testing procedure of the MTL4500 or MTL5500 modules.
Note that specific requirements may also be laid down in the E/E/PE operational maintenance procedure for the
complete installation.
If an MTL4500 or MTL5500 module is found to be faulty during commissioning or during the normal lifetime of
the product then such failures should be reported to the local MTL office. When appropriate, a Customer Incident
Report (CIR) will be notified to enable the return of the unit to the factory for analysis. If the unit is within the
warranty period then a replacement unit will be sent.
Consideration should be made of the normal lifetime for a device of this type which would be in the region of ten
years.
