DMS-20PC-4/20 Series
Subminiature 4-20mA Loop-Powered
3½ Digit LED Process Monitors
MPM_DMS20pc-420.C02
Page 1 of 6
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: [email protected], tel:
+1 508 339 3000
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.
FEATURES
N
Industry's first loop-powered meter with a large,
easy-to-read, LED display!
N
Self-powered, no external supply required
N
Unipolar, Bipolar and Positive Reading Models
N
Large, 0.37"/9.4mm digits
N
Excellent display intensity
N
High-quality, 20-turn, span (gain) and zero (offset)
adjustments
N
DIP-switch selectable range and decimal points
N
Hundreds of input/readout combinations
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Vibration-resistant package; Reliable screw-terminal
input
connections
SIMPLIFIED SCHEMATIC DIAGRAM
DATA
3½ DIGIT A/D
CONVERTER
DC/DC
CONVERTER
BAND-GAP
REFERENCE
CIRCUIT
DIP SWITCHES
ZERO
ADJUST
GAIN
ADJUST
1
2
3
CURRENT TO
VOLTAGE
CONVERTER
+5V
–5V
DP3
DP2
DP1
R3
R7
+
–
TB1
LOOP INPUT
5
6
1
1
1
2
2
2
3
4
5
6
3
3
4
4
5
6
ON
ON
ON
–
+