MTL Simplex FISCO Power Supplies MTL 9122-IS MTL FISCO Power supply IIB
MTL 9122-IS is a fieldbus repeater isolator which repeats the fieldbus signal from a safe area, Zone 2 fieldbus to an intrinsically safe fieldbus for connection to devices in Zone 1.
The 9122-IS provides up to 256mA, typically powering up to 16 x 15mA field devices in Gas Group IIB.
MTL 9122-IS is certified to FISCO (Fieldbus Intrinsically Safe Concept) requirements in IEC60079-11: 2011 Equipment protection by intrinsic safety i and IEC 60079-25: 2010 Intrinsically Safe
Electrical Systems. This allows the power supplied to the IS fieldbus to exceed the limit set in the original FF-816 IS physical layer profile. This increases the number of devices on an IS
fieldbus from typically 4 x 20mA devices with maximum of 80m cable run, to up to 12 x 20mA devices with 250m cable run using
the 9122-IS.
In addition, FISCO reduces the documentation required. Intrinsically safe systems have been installed in accordance with IEC 60079-25: 2010 Intrinsically Safe Electrical Systems entity
calculations or similar local code of practice. This requires:
• calculation of cable parameters
• comparison of safety descriptions
• creation of descriptive system document
The administrative work involved in carrying this out in accordance with the end users procedures is usually considerable.Simply adding a new field device to an IS segment will require all
this documentation to be updated.Fieldbus intrinsically safe systems can now also be installed in accordance with FISCO requirements in IEC 60079-25: 2010 Intrinsically Safe Electrical Systems.
This:
• eliminates need to calculate cable parameters
• reduces safety documentation to a list of devices
• allows addition of devices without a review of safety
documentation
• as proven by test, allows longer cables with higher
capacitance
To install a fieldbus system to the FISCO requirements in IEC 60079-25: 2010 Intrinsically Safe Electrical Systems the cable used in the system must comply with the following parameters:
Loop resistance Rc: 15 to 150 ohms/km
Loop inductance Lc: 0,4 to1 mH/km
Capacitance Cc: 80 to 200 nF/km
Maximum length of each spur cable: 60 m in IIC and IIB
Maximum length of each trunk cable: 1 km in IIC 5 km in IIB
When cable which complies with this specification is used, no further consideration of cable parameters is necessary. Virtually any instrument cable suitable for a fieldbus signal will comply.
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