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DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process
Performance/Functional Speci?cations
Typical at T A = +25°C, unless otherwise noted.
Monitors with Full-Size LCD Displays
Current Loop Input
Min.
Typ.
Max.
Units
Full Scale Input Range
Loop Burden
Voltage Drop
Overcurrent Protection
Performance
+3.8
–
–
–
–
80
1.8
–
+20.4
100
2.0
±40
mA
Ohms
Volts
mA
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-
Sampling Rate
Accuracy (1 minute warm-up)
2.5 reading per second
±0.05%FS ±1 Count
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
Temperature Drift
–
±0.15
±0.3
Cnts/°C
for determining equivalent DMS-30LCDA-4/20S DIP-switch settings in
Display
upgrading existing applications.
Display Type and Size
Polarity Indication
Overrange Indication
3? digit, 0.4"/10.2mm re?ective LCD
"–" for negative readings
"–1_ _ _ " for negative inputs
Applications that had the obsolete DMS-30LCD-4/20S setup for ‘bipolar’
operation should now use the new DMS-30LCDA-4/20S model con-
?gured per Table 1. Bipolar applications are those where a 4mA input
displays a negative number, a 12mA input displays “000”, and a 20mA
Physical/Environmental
"1_ _ _ " for positive inputs
input displays a positive number (for example, “-100”, “000” and “100”).
Applications that had the obsolete DMS-30LCD-4/20S setup for ‘unipo-
Operating Temperature
Storage Temperature
Humidity (non-condensing)
0
–20
0
–
–
–
+60
+75
85
°C
°C
°C
lar’ operation should now use the new DMS-30LCDA-4/20S con?gured
per Table 2. Unipolar applications are those where a 4mA input displays
“000” and a 20mA input displays a higher positive number.
Case Material
Polycarbonate
Table 1. DMS-30LCDA-4/20S DIP Switch Settings for
DMS-30LCD-4/20S Applications
Weight
0.75 ounces (21 grams)
Old Display Reading
New DMS-30LCDA-4/20S DIP Switch Setting
? The DMS-30LCDA-4/20 can withstand continuous overcurrents, including those
resulting from accidental reverse-polarity connections, up to ±40mA without
sustaining any damage.
? Because Murata Power Solution’s DMS Series loop-powered process monitors
employ active circuitry to convert the loop current into a voltage, their effective
4mA 20mA
1. 000 to 100-300
2. 000 to 400-600
3. 000 to 700-1999
4. ±100
SW1
On
SW2 SW3 SW4
Use Setting in Table 2
Use Setting in Table 2
Use Setting in Table 2
On On On
SW5
Off
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
speci?cation applies at 20mA.
5. ±200 to ±300
6. ±400 to ±600
7. ±700 to ±1900
Off
On
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
Off
On
? 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 speci?cation of ±2 counts (max.). Thus,
it may not always be possible to obtain the exact desired display reading.
Ordering Information
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,
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
i.e., both potentiometers and the DIP switches are randomly set.
The next example below, while speci?cally tailored for the “000” and
“1800” readings just noted, can also be used as a guide when con-
?guring the DMS-30LCDA-4/20S for other unipolar display readings.
When performing DIP-switch settings, be sure the DIP-switch’s small
actuators are ?rmly engaged in their fully ON or fully OFF positions.
** Replaces obsolete DMS-30LCD-4/20S model
A panel-mount retaining clip is supplied with each model.
-C suf?x indicated RoHS compliance.
1. Set R7 (span/gain adjust) and R3 (zero/offset adjust) fully clockwise ,
roughly 22 turns, and place SW1-SW8 to OFF.
2. Con?gure 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.”
www.murata-ps.com/dpm
19 Jan 2011
email: sales@murata-ps.com
MPM_DMS30-LCDA.B05 Page 2 of 6
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