1.0 GENERAL DESCRIPTION
Ronan’s Models X54-201L and -201SR are 3½-digit loop
powered indicators which display linear (-201L) and
square root (-201SR) values of the associated loop
current. The loop containing one of these indicators is
barely effected as the indicators require less than 1 V to
operate. These versatile modules allow the selection of
a linear or square root display, zero value, span and
decimal point through the placement of plug-in jumpers.
Spans from 0.100 to 1999 and span zeros from –360 to
+1300 are selected by the plug-in jumpers. The decimal
point selector plug may be placed in any one of four
positions which selects one, two or three digits to the
right of the decimal point or in position 0 for no decimal
point.
2.0 SPECIFICATIONS
Note:
Specifications apply at 25ºC ± 2ºC unless
otherwise stated. Specifications subject to change
without notice.
Input:
4-20 mA.
Input Protection:
Diode protected against
reverse polarity.
Voltage Drop:
Less than 1 V.
Span Selection:
Spans from 0.100 to 1999 digits are
selected by DIP-switch settings accessible at the top
board of the module. Refer to Table 3-1 on page 3.
Span Adjustment:
Front-accessible, multi-turn
potentiometer allows ± 20% adjustment of all ranges.
Zero-offset Selection:
Offsets from –360 to +1300
digits are selected by DIP-switch settings accessible at
the top board of the module. Refer to Table 3-2 on
page 3.
Zero Adjust:
Front accessible, multi-turn potentiometer
allows ± 10% adjustment of selected span range.
Decimal Point Selection:
Plug-in jumpers, accessible
at the top board of the module, allow selection of the
decimal point position. See section 3.5.
Accuracy:
Linear Display:
± 0.1% of span or ±1 digit.
Square Root Display:
± 0.3% of span or ± 1 digit
(applies from 4.3 to 20 mA input).
Operating Ambient Temperature Range:
–10º to
+55ºC.
Temperature Coefficient:
Zero
: ± 0.01% of Span/ºC, ± 0.01% of elevated zero
value/ºC.
Span
: ± 0.015% of Span/ºC.
Display:
3½-digit LCD, black digits on a reflective
background.
Terminals:
Compression type for wire size up to #14
AWG.
3.0 OPERATION
3.1 General
Model X54-201 is put into service by connecting it
in series with 4-20 mA current loop. The
connections are made to the two-position
compression-type screw terminal mounted on the
lower board and accessible from the top of the
module. The loop indicator module needs to be
removed from the enclosure in order to feed the
wires past the bottom board and into the screw
terminals. To remove the module from the
explosion-proof enclosure:
A. Unscrew and remove the enclosure cap.
B. Snap off the top plate of the module and insert
your index finger into cutout and remove the
plate.
C. Loosen the two module captive mounting
screws until the module is free.
D. Remove the module from the enclosure and
fasten the input wiring to the screw terminals.
E. Connect the lead that returns back to the –
output of the power supply, either directly or
through a two wire transmitter, to the – terminal
of the X54-201. Connect the other wire to the +
terminal. See Figure 3-1.
F. Re-install the module and enclosure cap.
The Model X54-201 Loop Powered Indicator is
normally shipped calibrated to ranges as specified
by the purchaser. However, it is designed to allow
easy reconfiguration in the field. The span is
changed by changing the position of one or two of
the SW1 switches -1 through -5. The span zero
value is changed by changing the settings of SW2
switches -1 through -6 and SW1-6.
Figure 3-1:
Wiring Diagram
2
X54-201 Approvals (_PM2 and _EXP2)
Factory Mutual Approvals
-EXP2 Housing
= Explosion Proof
-Class I-III, Div. 1, Grps B-G and NEMA 4
= Intrinsic Safe
-Class I-III, Div, Div. 1, Grps A-G and NEMA 4
-PM2 Housing
= Div. 2 Applications -Class I, Div. 2, Grps A-D
= Intrinsic Safe
-Class I, Div.1, Grps A-D
CSA Approvals
-EXP2 Housing
= Explosion Proof
-Class I-II, Div. 1, Grps B-G
= Intrinsic Safe
-Class I-II, Div. 1, Grps A-G
= Div. 2 Applications -Class I-II, Div. 2, Grps A-G
-PM2 Housing
= Div. 2 Applications -Class I, Div. 2, Grps A-D
= Intrinsic Safe
-Class I-II, Div. 1, Grps A-G
CENELEC Approvals
X54-201-MI (EXP housing)
Intrinsic Safe
-EEx ia IIC T4 (Tamb = 85°C)
-EEx ia IIC T5
X54-201-MX (EXP Housing)
Flame Proof
-EEx d IIC T6
-
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