DMS-20PC-4/20 Series
Subminiature 4-20mA Loop-Powered
3�½ Digit LED Process Monitors
FEATURES
Industry's first loop-powered meter with a large,
easy-to-read, LED display!
Self-powered, no external supply required
Unipolar, Bipolar and Positive Reading Models
Large, 0.37"/9.4mm digits
Excellent display intensity
High-quality, 20-turn, span (gain) and zero (offset)
adjustments
DIP-switch selectable range and decimal points
Hundreds of input/readout combinations
Vibration-resistant package; Reliable screw-terminal
input connections
The DMS-20PC-4/20 Series are the world's first loop-powered digital panel meters
with a large, easy-to-read, bright red, LED display. All operating power is derived
directly from the loop current itself—no external power supply is required! The large,
0.37"/9.4mm digits exhibit uniform intensity over the entire 4-20mA operating range.
Additionally, the total maximum loop voltage drop is only 5V! Users no longer have to settle
for difficult-to-read LCD displays in loop-powered applications.
Both gain (span) and offset (zero) adjustments are performed with on-board, precision,
20-turn potentiometers. All decimal-point and range-change selections are made on a six-
position DIP switch featuring vibration-resistant, gold-plated contacts. Unlike competitive
meters, there are no jumpers or solder gaps to open or close. Connections to the current
loop are made via a reliable, two-position, screw-type
terminal block.
The DMS-20PC-4/20's DIP switch and adjustment potentiometers accommodate
hundreds of different input-current/output-reading combinations. This versatility practically
eliminates the need to order more costly, long-lead-time, factory-customized "specials" in
applications in which several different-range meters are required. An optional bezel assem-
bly, featuring screw fasteners and a rubber seal, simplifies panel mounting and provides
excellent resistance to environmental dust and moisture. All these outstanding features
combine to make the DMS-20PC-4/20 Series the perfect meters for prototype and OEM
4-20mA current-loop instrumentation.
SIMPLIFIED SCHEMATIC DIAGRAM
3�½ DIGIT A/D
CONVERTER
DATA
R3
R7
1
2
3
DP1
DP2
DP3
ZERO
ADJUST
GAIN
ADJUST
BAND-GAP
REFERENCE
CIRCUIT
ON
DIP SWITCHES
1
2
3
4
5
6
+5V
–5V
CURRENT TO
VOLTAGE
CONVERTER
TB1
+
–
DC/DC
CONVERTER
+
–
LOOP INPUT
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMS20pc-420.C02
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MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
