After extensive testing,
Emerson Process Management has agreed that MTL's dedicated
Fieldbus protectors are unique in that they can be applied
to Foundation Fieldbus systems without the performance
limiting effects normally associated with surge
protectors.
MTL Surge Technologies' Fieldbus protector range consists
of the TP32 and the FP32. Emerson has agreed that both
devices are suitable for use with their Fieldbus solutions.
The FP32 prevents surges occurring on the Trunk or spurs
entering the control area or damaging terminators and
the TP32 provides protection for field instruments.
The multistage hybrid surge protection network at the
heart of the FP32 uses a combination of solid state electronics
and a gas filled discharge tube (GDT) to provide surge
protection up to 20kA. This impressive surge protection
circuit is design to exhibit exceptionally low line resistance
and adds only a tiny voltage drop to the bus. As a result,
no matter how many FP32 devices are connected to a Trunk
or spur the system will still be able to support its full
32 transmitters as specified by IEC61158-2. In operation
the FP32 device does not adversely affect the performance
or operation of the Fieldbus or connected equipment, it
allows signals to pass with very little attenuation while
diverting surge currents safely to earth and clamping
output voltages to safe levels.
The FP32 meets IEC61158-2:2000 for 31.25kB/s systems such
as FOUNDTION Fieldbus, PROFIBUS-PA and WorldFIP whilst
the TP32 meets the additional requirements of ANSI/ISA-50.02-2
1992 for 31.25kB / sec systems.
The TP32 protection network is a hybrid design consisting
of high-power, solid state electronics and a gas discharge
tube, which are capable of diverting surges up to 10kA.
Encased in a stainless steel enclosure, the TP32 exhibits
unparalleled mechanical durability providing years of
maintenance free operation in harsh environments. The
enclosure is available threaded for all the common conduit
entries.
To provide complete protection it is strongly recommended
that the AC power input to the power supply and host be
protected. MTL has many options here, but the most popular
product is the MA15 (UL1449 recognized and approved for
Class I, Division2 Groups A, B, C and D). The MA15 provides
state of the art surge protection and RFI filtering to
completely protect Fieldbus equipment.
All MTL Surge Technologies products come with a 10-year
warranty. |
