Ronan X57 - Manual (Page 3)

X57
Typical Barrier Choices:
Field Devices Barrier Choices*
Switches (dry contact) X57-128P, X57-228P,
X57-228PD, X57-228PCL,
X57-328P, X57-428P
Thermocouples X57-205S
(ungrounded only)
RTDs and Potentiometers X57-305P, X57-405P
2-Wire Transmitters
X57-128N, X57-228PD
X57-228P-209P
Solenoids/Relays/LEDs X57-128P, X57-228PD
I/P Transducers X57-228PD
Strain Gauges X57-210A
Magnetic Flow Sensors X57-110A, X57-210S
and AC Sensors
S h u n t D i o d e Z e n e r ( P a s s i v e ) I . S . B a r r i e r s S h u n t D i o d e Z e n e r ( P a s s i v e ) I . S . B a r r i e r s
Ronan's Zener Barriers, especially the multi-
channel versions, are a logical choice when space
and cost are the major considerations. They do not
require their own power supply, but rather provide
protection passively. Most likely, there is a barrier
that will work, and a detailed analysis of the applica-
tion will usually identify a zener barrier that is right
for the application. However, zener barriers do
require a high integrity I.S. ground. This may present
a problem, especially in older plant installations.
When the quality or availability of an I.S. ground is
questionable, the designer should consider using
active barriers.
◗ Lowest Cost Barrier Option
◗ 1, 2, 3, and 4 Channel Barriers
◗ Negative, Positive, or AC Voltage Versions
◗ Highly Reliable Fast Acting Fuses
◗ Power Supply is Not Required
◗ NO FAULT “Blown Fuse” Barrier Replacement Policy
◗ DIN Rail or Multi-Barrier Surface Mount Chassis
3.60"
(91.44 mm)
2.50" (63.50 mm)
.88" (22.35 mm)
Specifications:
Type: Shunt zener diode with non-replaceable fuses
Mounting: Plug-in (chassis required) with gold plated
connections
Wiring: All wiring and grounding is attached to the
chassis to simplify installation and maintenance
Wire Size: Up to #12 AWG
Size: (chassis not included): 3.60 ″ H x .88 ″ W x 2.50 ″ D
(up to four (4) channels per barrier)
Weight: (chassis not included): 5.6 ounces
Operating Temperature: -20˚C to +50˚C
Storage Temperature: -40˚C to +80˚C
Relative Humidity: 95% non-condensing
◗ With replaceable fuses, the chance
exists that the wrong type or rating of
fuse could be installed, or that the
fuses could be defeated (bypassed with
a short circuit).
◗ Circuit breakers are mechanical, and
they are therefore more susceptible to
aging, corrosion, and damage. Also,
they typically have lower accuracy
specifications.
◗ Both the replaceable fuse and the
circuit breaker designs are harder and
more expensive to manufacture.
Therefore, they cost you more money.
Ronan's zener barriers are potted
solid. This means that if a fuse is blown,
the barrier has done its job and protected
the hazardous area as it was designed to
do. It’s true the barrier can not be field
repaired. However, if you do “blow” a
barrier fuse (even if its your fault), just
contact the Ronan factory for a rush
replacement at 1/2 price. Also, for most
applications, Ronan can provide an
easily installed in-line fuse device which
can protect the barrier’s internal fuse
(See accessory #X57-FUSE).
R e p l a c e a b l e F u s e s a n d C i r c u i t B r e a k e r s v s . N o n - R e p l a c e a b l e F u s e s
* Some European applications require an “EN” designator within the part
number (i.e. X57EN-600). Contact your local Ronan sales office for details.
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