MTL power supplies for Non-Incendive fieldbus applications

The MTL9111 NI and the MTL9112 NI Power Supplies can be used to power field devices in Zone 2 / Division 2 hazardous areas for conventional Non-Incendive and FNICO (Fieldbus Non-Incendive COncept) applications. The MTL9111 NI power supply can power up to nine (9) 20 mA devices in Gas Group IIC/Groups A-D and the MTL9112 NI power supply can power up to sixteen (16), 20 mA devices in Gas Group IIB/Groups C and D. Ensure that the fieldbus devices and all components used in the application are rated and certified for Non-Incendive applications in these Gas Groups. With the exception of NI power supplies, many fieldbus components (H1 card, terminators, and wiring components) are the same for Non-Incendive installations and other types of fieldbus installations.

The MTL9111 NI and 9112 NI power supplies can be used in either of the following applications:

• Conventional Non-Incendive circuits. For Non-Incendive/ExnL applications in which the wiring is energy limited; cable parameters must be considered.
• FNICO circuits in which cable parameter calculations are not required. FNICO is similar to FISCO and is described in MTL Application Note AN9027.

The MTL9111 NI and 9112 NI power supplies have a host side terminator switch and a host side power switch on the front of the unit. The terminator on the field side is permanently connected. Both power supplies are fieldbus repeater power supplies that repeat the fieldbus signal from the field to the host and power both the fieldbus segment and the host. Refer to the MTL documentation for additional information on their products.

Both the MTL9111 NI and 9112 NI power supplies can provide power to the host in the safe area. The supplies are rated at 30 mA and are capable of providing host power for either the simplex or redundant H1 cards. The distance between the host and the NI power supply can exceed 1000 meters.

MTP power supplies are Emerson Alliance Program products.