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
3�½ 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**
DMS-30LCDA-4/20B
DMS-30LCDA-4/20P
DMS-30LCDA-4/20I
DMS-BZL1
DMS-BZL2
DMS-30-CP
DMS-PS4-CM
DMS-PS7-CM
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
+24V/0.45A ac/dc power supply module
+24V/0.7A ac/dc power supply module
** Replaces obsolete DMS-30LCD-4/20S model
A panel-mount retaining clip is supplied with each model.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMS30-LCDA.B02
Page 2 of 6
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