Catalog Excerpt WG 250 pages

Loop-Powered Supplies

WG 25
To power intrinsically safe 2-wire transmitters
and SMART transmitters.
The Advantages
Compared with active repeater power supplies, it has considerable price and reliability
advantages.
Multi-channel systems, for example, require
only one central, safe-area power supply
that does not even need protective
separation.
The Technology
Using Knick TransShield technology, the
WG 25 has specifications that were previously not available in passive repeater
power supplies:

The Task
The passive WG 25 repeater power supply is
loop-powered. It is used for galvanic hazardous-area separation of a 2-wire supply line
and transmits both 4 ... 20 mA and HART
s
­ ignals in both directions. With a voltage
drop of just 4.2 V, the WG 25 uses the supply
optimally so that all common 2-wire transmitters can be connected.

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– xtremely high reliability,
E
MTTF of over 300 years
– rotective separation, transient protection
P
– 0 kV test voltage (optional)
1
– igh electromagnetic compatibility
H
– xtremely low residual ripple and
E
­common-mode interference
– xcellent pulse formation
E
– ART transmission
H
– azardous/safe area separation
H