Eaton - MTL Product Line
Foundation Power Supply/Conditioner
The 9122-IS is a fieldbus repeater isolator that repeats the fieldbus
signal from a safe area, Zone 2 or Division 2 fieldbus to an
intrinsically safe fieldbus for connection to devices in Zone or Division
1. The 9122-IS provides 0 to 250mA with short circuit/overload
protection, typically powering up to 12 x 20mA field devices in Gas Group
IIB and several may be multidropped on a single fieldbus host port. 250V
ac isolation between the power, host and IS fieldbus connections ensures
robust operation even in an electrically noisy environment.
The 9122-IS has a switch selectable terminator on the host side and a
fixed terminator on the IS side. In addition several host fieldbus cards
require power from the bus so there is an option of providing power on
the host connection. There is a choice of pluggable screw or spring clamp
The 9122-IS can be used with any fieldbus device that is certified as
intrinsically safe to the FISCO physical layer profile. The NET9000 range
of fieldbus products from MTL have a similar environmental specification
to field transmitters, guaranteeing reliable operation in a harsh process
environment when this is required - corrosion resistance to G3; -40 to
+70C; vibration and shock resistance to the exacting Lloyds standards.
The unit is compact, requiring only 42mm of DIN rail width, minimising
the space required.