Ronan X57 User Manual

Page 4

Typical Barrier Choices:

Field Devices

Barrier Choices*

Switches (dry contact)

X57-650 (dual channel)

Proximity Sensors

X57-653

Thermocouples (grounded

X57-606

or ungrounded)
RTDs and Poteneiometers

X57-605

2-Wire Transmitters

X57-600, X57-660

Honeywell Protocol

X57-600H, X57-660H

Ronan, Hart, Rosemount

X57-600R, X57-660R

I.S. Ground Required

X57-528N

Solenoids/Relays/LEDs

X57-610, X57-611(S)

I/P Transducers

X57-620

In numerous applications, zener diode barriers

will either not work, or they impose constraints that

complicate system design. The series resistance, fuse

rating and maximum working voltage of a zener

diode barrier, can cause the design engineer hours

of frustrating analysis to confirm both safety and

proper system operation. Ronan's line of active I.S.

barriers eliminates much of the tedious analysis re-

quired. In some cases, the active barrier can actually

double as a signal conditioner and eliminate other

devices from the loop. These considerations, along

with the fact that no I.S. ground is required, and the

fact that most circuits are short circuit proof, has

caused the active barriers to gain popularity.

4.75" (120.65 mm)

3.60"

(91.44 mm)

.88" (22.35 mm)

Specifications:

Type: Active isolation

Power: Nominal 24 Vdc @ 50 to 100 mA

(see individual barriers specifications)

Mounting: Plug-in (chassis required) with gold plated

connections

Wiring: All wiring 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 4.75

″

(1 to 2 channels; see individual data sheets)

Weight: (chassis not included): Approximately 6 ounces

Operating Temperature: -20˚C to +50˚C

Storage Temperature: -40˚C to +80˚C

Relative Humidity: 95% non-condensing

The concept of "Intrinsic Safety"
originated in the European markets but
is gaining in popularity all over the
world. Originally, and still the case with
some equipment, manufacturers had
their field instruments tested and
approved with a specific I.S. barrier
(Loop Approvals). This limited the
user's choices of field instruments and

barriers. The Entity Approval concept is
now becoming the standard because it
allows the user to select field
instruments and I.S. barriers from any
approved supplier. The only stipulation
is that the entity numbers of both
devices are properly matched and that
the equipment is properly installed per
the approved installation drawings.

It is important to remember that an

l.S. barrier does not make a field device
safe. The field instrument must be either
a "simple apparatus" or an l.S. device
which was certified under the entity
concept in order for it to be compatible
with Ronan l.S. barriers. If you have a
question or concern about your applica-
tion, contact Ronan for assistance.

E n t i t y A p p r o v a l s v s . L o o p A p p r o v a l

◗

Full Input, Output and Power Isolation
(Eliminates ground loops)

◗

Short Circuit Proof (Most models) or Fuse Protected

◗

No I.S. Ground Required

◗

Less Critical Circuit Design Constraints

◗

Eliminates Other Signal Conditioning, thereby
Lowering Installed Cost

◗

Discrete or Analog Input and Output Barrier Options

X57

G a l v a n i c I s o l a t i o n ( A c t i v e ) B a r r i e r s

* Some European applications require an “EN” designator within the part

number (i.e. X57EN-600). Contact your local Ronan sales office for details.