www.murata-ps.com
DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
FEATURES
■
■
Super-low loop drop: 1.8V typical, 2.0V max.
Self-powered 2-wire operation; no separate
supply required
Unipolar, Bipolar, Positive, and Inverse Reading Models
Subminiature package; Less than 0.90"
behind-the-panel depth
Large, 0.40"/10.2mm high, sunlight-viewable LCD display
Non-interacting gain (span) and offset (zero)
20-turn potentiometers
DIP-switch selectable range and decimal points
Hundreds of different input-current/readout combinations
Vibration-resistant package; reliable
screw-terminal input connections
■
■
Murata Power Solution’s new DMS-30LCDA-4/20 Series’ 1.8V nominal loop-drop is the
lowest of any comparably priced, 4-20mA input, 3½-digit process monitors with full-size
LCD displays. This super-low loop-drop guarantees a maximum burden of no more than
100 Ohms! And because it’s loop-powered, all operating power is derived directly from the
loop current itself; no separate power source is required! Their floating 2-wire design allows
DMS-30LCDA-4/20 Series process monitors to be connected anywhere in the current loop.
All decimal point and range-change selections are made via an eight-position DIP switch
which features vibration-resistant, gold-plated contacts—there are no cumbersome jumpers
or solder gaps to contend with. Both gain (span) and offset (zero) adjustments are performed
using 20-turn, non-interacting potentiometers. Four different models accommodate unipolar,
bipolar, positive, and inverse display-reading applications. The DMS-30LCDA-4/20 Series’
DIP switch and adjustment potentiometers can accommodate literally hundreds of different
input-current/output-reading combinations.
DMS-30LCDA-4/20 Series’ subminiature package houses a large, 0.40”/10.2mm, high-
contrast LCD display that can be read in virtually all lighting conditions—including full sunlight!
The two connections to the external loop are made via a reliable screw-type terminal block. For
environmentally demanding applications, an optional panel-mount bezel assembly, featuring
screw fasteners and a rubber gasket, provides excellent resistance to dust and moisture. All
these outstanding features combine to make the new DMS-30LCDA-4/20 Series ideal for all
your 4-20mA process-monitoring instrumentation needs.
■
■
■
■
■
3 ½ D IG IT A /D
C O N V E R T E R
D A T A
R 3
R 7
1
2
3
4
5
D P 1
D P 2
D P 3
Z E R O
A D J U S T
B A N D -G A P
R E F E R E N C E
C IR C U IT
G A IN
A D J U S T
O N
D IP S W IT C H E S
1
2
3
4
5
6
7
5
8
+ 5 V
5 V
D C /D C
C O N V E R T E R
C U R R E N T T O
V O L T A G E
C O N V E R T E R
T B 1
For full details go to
www.murata-ps.com/rohs
+
L O O P IN P U T
Figure 1. DMS-30LCDA-4/20 Simplified Schematic
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16 Sep 2010 MPM_DMS30-LCDA.B04
Page 1 of 6
DMS-30LCDA-4/20 Series
Performance/Functional Specifications
Typical at T
A
= +25°C, unless otherwise noted.
Current Loop Input
Full Scale Input Range
Loop Burden
Voltage Drop
Overcurrent Protection
Performance
Sampling Rate
Accuracy (1 minute warm-up)
Temperature Drift
Display
Display Type and Size
Polarity Indication
Overrange Indication
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Case Material
Weight
0
–20
0
–
–
–
+60
+75
85
°C
°C
°C
3½ digit, 0.4"/10.2mm reflective LCD
"–" for negative readings
"–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
–
2.5 reading per second
±0.05%FS ±1 Count
±0.15
±0.3
Cnts/°C
Min.
+3.8
–
–
–
Typ.
–
80
1.8
–
Max.
+20.4
100
2.0
±40
Units
mA
Ohms
Volts
mA
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
OPERATING AND SETUP INSTRUCTIONS
Important Instructions for Users of Obsolete
DMS-30LCD-4/20S Meters
The new DMS-30LCDA-4/20S unipolar-reading model has provisions
to accommodate all the display ranges of the obsolete DMS-30LCD-
4/20S. The “Old Display Readings” column in Table 1 is taken directly
from the DMS-30LCD-4/20S datasheet. Table 1 is provided as a guide
for determining equivalent DMS-30LCDA-4/20S DIP-switch settings in
upgrading existing applications.
Applications that had the obsolete DMS-30LCD-4/20S setup for ‘bipolar’
operation should now use the new DMS-30LCDA-4/20S model con-
figured per Table 1. Bipolar applications are those where a 4mA input
displays a negative number, a 12mA input displays “000”, and a 20mA
input displays a positive number (for example, “-100”, “000” and “100”).
Applications that had the obsolete DMS-30LCD-4/20S setup for ‘unipo-
lar’ operation should now use the new DMS-30LCDA-4/20S configured
per Table 2. Unipolar applications are those where a 4mA input displays
“000” and a 20mA input displays a higher positive number.
Table 1.
DMS-30LCDA-4/20S DIP Switch Settings for
DMS-30LCD-4/20S Applications
Old Display Reading
4mA
20mA
1.
000 to 100-300
2.
000 to 400-600
3.
000 to 700-1999
4.
±100
5.
±200 to ±300
6.
±400 to ±600
7.
±700 to ±1900
On
Off
On
Off
New DMS-30LCDA-4/20S DIP Switch Setting
SW1
SW2
SW3
SW4
SW5
Use Setting in Table 2
Use Setting in Table 2
Use Setting in Table 2
On
Off
Off
Off
On
On
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Polycarbonate
0.75 ounces (21 grams)
➀
The DMS-30LCDA-4/20 can withstand continuous overcurrents, including those
resulting from accidental reverse-polarity connections, up to ±40mA without
sustaining any damage.
➁
Because Murata Power Solution’s DMS Series loop-powered process monitors
employ active circuitry to convert the loop current into a voltage, their effective
series impedance (loop burden) varies in a manner that maintains the loop volt-
age drop relatively constant over the full 4-to-20mA current range. Listed burden
specification applies at 20mA.
➂
When looking up DIP-switch settings in the Tables and the desired display read-
ings can be achieved with either of two different settings, using the higher setting
number will usually result in less sensitive offset (R3) and span (R7) adjustments.
Please keep in mind that the DMS-30LCDA standard meter from which the DMS-
30LCDA-4/20 is derived has an accuracy specification of ±2 counts (max.). Thus,
it may not always be possible to obtain the exact desired display reading.
DMS-30LCDA-4/20S (Standard Unipolar-Reading)
The DMS-30LCDA-4/20S’s span and offset circuitry are optimized to
display standard, unipolar readings where a 4mA input always reads
“000” and a 20mA input always displays a higher positive number.
As shipped, the DMS-30LCDA-4/20S is calibrated to read “000” for a
4mA input and “1800” for a 20mA input. These readings are used for
factory test-purposes only. The following worst-case calibration pro-
cedure assumes the DMS-30LCDA-4/20S is completely misadjusted,
i.e., both potentiometers and the DIP switches are randomly set.
The next example below, while specifically tailored for the “000” and
“1800” readings just noted, can also be used as a guide when con-
figuring the DMS-30LCDA-4/20S for other unipolar display readings.
When performing DIP-switch settings, be sure the DIP-switch’s small
actuators are firmly engaged in their fully ON or fully OFF positions.
1. Set R7 (span/gain adjust) and R3 (zero/offset adjust) fully clockwise,
roughly 22 turns, and place SW1-SW8 to OFF.
2. Configure the meter per DIP-switch setting #1 in Table 2.
3. Apply a precision 4mA input with proper polarity and adjust R3 until
the meter’s display reads “000.”
Ordering Information
DMS-30LCDA-4/20S-C**
DMS-30LCDA-4/20B-C
DMS-30LCDA-4/20P-C
DMS-30LCDA-4/20I-C
DMS-BZL1
DMS-BZL2
DMS-30-CP
Unipolar reading, loop-powered LCD meter
Bipolar reading, loop-powered LCD meter
Positive reading, loop-powered LCD meter
Inverse reading, loop-powered LCD meter
Bezel assembly
Bezel assembly with sealing gasket
Panel cutout punch
** Replaces obsolete DMS-30LCD-4/20S model
A panel-mount retaining clip is supplied with each model.
-C suffix indicated RoHS compliance.
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16 Sep 2010 MPM_DMS30-LCDA.B04
Page 2 of 6
DMS-30LCDA-4/20 Series
4. Apply a precision 20mA input and adjust R7 until the display reads “1800.”
Repeat steps 3 and 4 to make sure the adjustments do not affect one
another.
5. Select the appropriate decimal point by setting SW6, SW7 or SW8 to ON
(DP1, DP2 or DP3 respectively).
NOTE: If a display reading other than “000” to “1000” is desired,
refer to DIP-Switch Settings Table 2 for SW1-SW5 settings
Table 2.
DMS-30LCDA-4/20B (Standard Unipolar) DIP Switch Settings
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
When configuring the DMS-30LCDA-4/20B for the first time, or when
selecting a new range, set both R3 and R7 fully clockwise (roughly 22 turns)
to their minimum offset/minimum-span positions, respectively. Then select
the desired readings from Table 3 and configure DIP-switches SW1, SW2,
and SW3 accordingly. Please note, positions SW4 and SW5 are not used in
bipolar ‘B’ models.
The procedure below illustrates how to calibrate the DMS-30LCDA-4/20B
to its factory-calibrated readings of “-1000” with a 4mA input and “1000”
with a 20mA input. When performing DIP-switch settings, be sure the DIP-
switch’s small actuators are firmly engaged in their fully ON or fully OFF
positions.
1. Set both R3 and R7 fully clockwise.
2. Select DIP-switch setting #1 from Table 3.
3. Apply a precision 12mA input and adjust R3 until the meter’s display reads
“000.”
Desired Display Reading
4mA
20mA
SW1
Off
On
Off
On
On
SW2
Off
Off
Off
On
On
SW3
Off
Off
On
On
On
SW4
Off
Off
Off
Off
On
SW5
Off
Off
Off
Off
Off
1.
000 to 1200 to 1999
2.
000 to 600 to 1200
3.
000 to 400 to 600
4.
000 to 200 to 400
5.
000 to 100 to 200
Examples
(DMS-30LCDA-4/20S, Unipolar)
1. Desired display readings are:
4mA ="0.00"
20mA = "6.00"
1
2
3
4
5
6
7
O N
4. Apply a precision 20mA input and adjust R7 until the meter’s display reads
“1000.”
5. Apply a precision 4mA input and the display should read “-1000.” Repeat
steps 3 and 4 to make sure the two adjustments did not affect one another.
8
Use DIP-switch setting #3 in Table 2 and enable decimal point DP2
via SW7. Apply 4mA and adjust R3 so the display reads “0.00.” Apply
20mA and adjust R7 so the display reads “6.00.”
2. Desired display readings are:
4mA =" 000"
20mA = "800"
1
2
3
4
5
6
7
O N
Table 3.
DMS-30LCDA-4/20B (Bipolar) DIP Switch Settings
Desired Display Reading
4mA
12mA
000
000
000
000
20mA
600 to 1000
350 to 650
250 to 400
150 to 250
100 to 150
SW1
Off
On
Off
Off
On
SW2
Off
Off
On
Off
On
SW3
Off
Off
Off
On
On
SW4
NA
NA
NA
NA
NA
SW5
NA
NA
NA
NA
NA
1.
–600 to –1000 000
8
2.
–350 to –650
3.
–250 to –400
4.
–150 to –250
5.
–100 to –150
Use DIP-switch setting #2 in Table 2. Apply 4mA and adjust R3 so the
display reads “000.” Apply 20mA and adjust R7 so the display reads
“800.” For these display readings, no decimal points are used. Set
SW6, SW7 and SW8 to OFF.
3. Desired display readings are:
4mA = ".000"
12mA = ".250"
1
O N
Examples
(DMS-30LCDA-4/20B, Bipolar )
1.
Desired display readings are:
O N
2
3
4
5
6
7
8
4mA ="–1.00"
20mA = "1.00"
1
2
3
4
5
6
7
8
This example is not as straightforward as the previous two. Notice that
12mA is exactly halfway between 4mA and 20mA. If we assume that
the input could go up to 20mA, the display reading would then be: 2 x
.250 or “.500.” From Table 2 we can now select DIP-switch setting #3
and enable DP1 via SW6. Apply 4mA and adjust R3 so the display reads
“.000.” Apply 12mA and adjust R7 so the display reads “.250.”
Use DIP-switch setting #5 in Table 3 and enable decimal point DP2
via SW7. Apply 12mA and adjust R3 so the display reads “0.00.”
Apply 20mA and adjust R7 so the display reads “1.00.” Apply 4mA
and verify that the display reads “-1.00”, readjust R3 and R7 if nec-
essary.
O N
2.
Desired display readings are:
4mA =" –450"
20mA = "450"
1
2
3
4
5
6
7
DMS-30LCDA-4/20B
(Bipolar-Reading
)
The DMS-30LCDA-4/20B’s zero-offset circuit differs from the unipolar
‘S’ model described above in that with the ‘B’ model, a half-scale
12mA input is typically set to display “000.” Therefore, all of the of the
DIP-switch settings in Table 3 assume a reading of “000” is desired
with a half-scale 12mA input. Display readings other than those
shown in Table 3 are possible, contact DATEL for more information.
8
Use DIP-switch setting #2 in Table 3. Apply 12mA and adjust R3 so
the display reads “000.” Apply 20mA and adjust R7 so the display
reads “450.” Apply 4mA and verify that the display reads “-450.”
Repeat adjustment procedure if necessary. For these display read-
ings, no decimal points are used. Set SW6, SW7and SW8 to OFF.
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16 Sep 2010 MPM_DMS30-LCDA.B04
Page 3 of 6
DMS-30LCDA-4/20 Series
3.
Desired display readings are:
4mA = "–650"
20mA = "650"
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
ON
1
2
3
4
5
6
7
8
2. Subtract 040 from 200 to yield a differential-reading value of 160;
use this value to select DIP-switch setting #5 in Table 4. Enable
decimal point DP3 by placing SW8 to the ON position.
3. Set the transmitter’s output to 4.0mA and carefully adjust R3 clock-
wise until the meter’s display reads “000.”
4. Set the transmitter’s output to 20.0mA and adjust R7 counterclock-
wise until the meter’s display reads “16.0.”
5. Set the transmitter back to 4.0mA and slowly adjust R3 clockwise
until the display reads “04.0.” Reapply 20.0mA and the display
should now read “20.0.” Repeat steps 3, 4, and 5 to make sure the
adjustments did not affect one another.
Table 4.
DMS-30LCDA-4/20P (Positive Reading)
DIP Switch Settings
4mA
900
850
800
750
750
20mA
1700
1350
1150
1000
900
SW1
Off
On
Off
Off
On
SW2
Off
Off
On
Off
On
SW3
Off
Off
Off
On
On
SW4
NA
NA
NA
NA
NA
SW5*
OFF
OFF
OFF
OFF
OFF
Notice that these readings can be obtained using either DIP-switch
setting #1 or DIP-switch setting #2 in Table 3. In situations like this
where DIP-switch settings overlap, less-sensitive R3/R7 adjustments
can be achieved if the higher DIP-setting # is selected (setting #2
in this example). Apply 12mA and adjust R3 so the display reads
“000.” Apply 20mA and adjust R7 so the display reads “650.” Apply
4mA and verify that the display reads “-650.” Repeat adjustments if
necessary.
DMS-30LCDA-4/20P
(Positive-Reading)
The DMS-30LCDA-4/20P’s zero-offset circuit is optimized to produce
positive readings at both 4mA and 20mA input levels. As shown in
Table 4’s first three columns, a 4mA input can be adjusted (using R3,
Zero/Offset Adjust) to display any positive reading between “000”
and “800.” The corresponding 20mA-input reading is then added to
the 4mA offset as a differential whose magnitude is varied by adjust-
ing R7 (Gain/Span Adjust).
The ‘Differential Range’ column in Table 4 lists the nominal dif-
ferential display-readings which can be obtained with R7 at, or very
close to, its full-clockwise, minimum span position. The ‘Differential
Range’ column can be used as a guide when configuring the meter
for the majority of user applications. Higher differential ranges are
obtainable; however, the use of higher differential readings results
in correspondingly-lower positive readings with 4mA inputs, that
is, R3’s clockwise adjustment-range is reduced. Example #3 below
illustrates this point. Contact DATEL if there is any doubt as to
whether or not the DMS-30LCDA-4/20P can be configured for your
display-reading requirements.
The first step when initially configuring the DMS-30LCDA-4/20P, or
when selecting a new range, is to set R3 fully counterclockwise and
R7 fully clockwise (roughly 22 turns each) to their minimum offset
and minimum span positions, respectively.
The next step is to calculate the differential display-reading; this is
accomplished by subtracting the desired 4mA display reading from
the desired 20mA display reading, disregarding decimal points. Then,
using the calculated differential display-reading to select the appro-
priate DIP-switch setting # from Table 4, configure DIP-switches
SW1, SW2, and SW3 accordingly. Please note, positions SW4 and
SW5 are not used in positive reading ‘P’ models. Also, make certain
that the DIP-switch’s small actuators are firmly engaged in their fully
ON or fully OFF positions.
The example below describes how to calibrate the meter for an
application which the DMS-30LCDA-4/20P easily accommodates:
displaying the output of a 4-20mA transmitter, that is, “04.0” with a
4mA input and “20.0” with a 20mA input.
1. Set R3 fully counterclockwise (minimum offset position) and R7 fully
clockwise (minimum differential span position), roughly 22 turns.
Desired Display Readings
Diff. Range
1.
800 to 1400
2.
500 to 800
3.
350 to 500
4.
250 to 350
5.
150 to 250
* Setting SW5 to On will increase the differential range.
See example 2 below.
Examples
(DMS-30LCDA-4/20P, Positive Reading)
1.
Desired display readings are:
4mA ="650"
20mA = "950"
1
2
3
ON
4
5
6
7
8
Use DIP-switch setting #4 in Table 4 since subtracting 650 from 950
yields a differential value of 300. Apply 4mA and adjust R3 until the
display reads “000.” Apply 20mA and adjust R7 until the display
reads “300” (the differential value previously calculated). Apply 4mA
and adjust R3 until the display reads “650.” Apply 20mA and verify
that the display reads “950.”
ON
2.
Desired display readings are:
4mA =" 4.00"
20mA = "19.99"
1
2
3
4
5
6
7
8
This example illustrates the DMS-30LCDA-4/20P’s capability to
display higher differential readings than those indicated in Table
4. This example also illustrates how the DMS-30LCDA-4/20P can
be used to display the output levels of a 4-20mA transmitter with
higher precision (0.01mA versus 0.1mA) than the example previ-
ously described.
Subtracting 400 from 1999 yields a differential of 1599, a value
not listed in Table 4. However, use DIP-switch setting #1 in Table
4 and enable SW5 since this setting has the highest overall offset/
span adjustment capabilities. Enable DP2 via SW7, then apply 4mA
and adjust R3 so the display reads “0.00.” Apply 20mA and adjust
R7 so the display reads “15.99.” Apply 4mA and adjust R3 until the
display reads “4.00.” Apply 20mA and check to see that the display
reads “19.99” or just overranges (“1—”). Repeat adjustment
procedure if necessary.
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16 Sep 2010 MPM_DMS30-LCDA.B04
Page 4 of 6
DMS-30LCDA-4/20 Series
DMS-30LCDA-4/20I
(Inverse Reading)
The DMS-30LCDA-4/20I is designed to accommodate applications
where an
increasing
loop current produces a
decreasing
display
reading. That is, as the loop current is increased from 4mA to 20mA,
the display will read a user determined full-scale positive number
at 4mA and then decrease to “000” at 20mA. The ‘4/20I’ model is
essentially a ‘-4/20S’ model operating in reverse. Table 5 and the
two examples that follow describe the operation of this model in
greater detail.
The first step when configuring the DMS-30LCDA-4/20I for the first
time, or when changing to a different range, is to set both R3 and
R7 to their full clockwise positions, roughly 22 turns. Next, using the
desired display readings, select the appropriate DIP-switch setting
number from Table 5.
Table 5.
DMS-30LCDA-4/20I (Inverse Reading) DIP Switch Settings
Desired Display Reading
4mA
1.
1999 to 1300
2.
1300 to 850
3.
850 to 550
4.
550 to 350
5.
350 to 200
6.
200 to 130
20mA
000
000
000
000
000
000
SW1
Off
On
Off
Off
On
On
SW2
Off
Off
On
Off
On
On
SW3
Off
Off
Off
On
On
On
SW4
Off
Off
Off
Off
Off
On
SW5
NA
NA
NA
NA
NA
NA
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
Examples
(DMS-30LCDA-4/20I, Inverse Reading)
1. Desired display readings are:
4mA = “6.00”
20mA = “0.00”
1
2
3
4
5
6
7
8
ON
Use DIP-switch setting #3 in Table 5 and enable decimal point DP2
via SW7. Apply 20mA and adjust R3 so the display reads “0.00.”
Apply 4mA and adjust R7 so the display reads “6.00.”
2. Desired display readings are:
4mA = “800”
20mA = “000”
1
2
3
4
5
6
7
8
ON
Use DIP-switch setting #2 in Table 5. Apply 20mA and adjust R3 so
the display reads “000.” Apply 4mA and adjust R7 so the display
reads “800.” For these display readings, no decimal points are used.
Set SW6, SW7 and SW8 to OFF.
Table 6.
Decimal Point Selections (All Models)
To turn on a decimal point, place its respective DIP switch to the fully ON position.
SW6
DP1
SW7
DP2
SW8
DP3
MECHANICAL SPECIFICATIONS
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES:
WIRE SIZE:
STRIPPING LENGTH:
2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
18 to 26 AWG
(Solid or stranded)
0.20" (5.08mm)
0 .9 0
(2 2 .9 )
0 .0 4 0
(1 .0 2 )
0 .0 4 0
(1 .0 2 )
2 .0 9
(5 3 .1 )
2 .1 7
(5 5 .1 )
Back View
Zero
Adjust
DIP
Switches
ON
1
R3
Zero
Adjust
1
2
3
4
5
6
7
8
TB1
+
R7
Gain
Adjust
–
Gain
Adjust
+ –
Loop
Input
DP1
(SW6)
DP2
(SW7)
DP3
(SW8)
www.murata-ps.com/dpm
D M S -3 0 L C D A -4 /2 0 S
®
®
M A D E IN U S A
0 .0 4 0
(1 .0 2 )
0 .8 4
(2 1 .3 )
0 .9 2
(2 3 .4 )
Front View
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Page 5 of 6
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