Murata DMS-20PC-4/20S-C Manual

www.murata-ps.com
FEATURES
 
Industry's fi rst 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
SIMPLIFIED SCHEMATIC DIAGRAM
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The DMS-20PC-4/20 Series are the world's fi rst 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 diffi cult-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, simplifi es 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.
R3 R7
GAIN
ZERO
ADJUST ADJUST
BAND-GAP
REFERENCE
CIRCUIT
+5V –5V
DC/DC
CONVERTER
DMS-20PC-4/20 Series
Subminiature 4-20mA Loop-Powered
3½ DIGIT A/D
DATA
CONVERTER
1 2 3
ON
DIP SWITCHES
1 2 3 4 5 6
CURRENT TO
VOLTAGE
CONVERTER
3½ Digit LED Process Monitors
DP1 DP2 DP3
TB1
+ –
+ –
LOOP INPUT
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