Figure 1. DMS-30LCDA-4/20 Simplified Schematic

Murata Power Solution’s new DMS-30LCDA-4/20 Series’ 1.8V nominal loop-drop is the

lowest of any comparably priced, 4-20mA input, 3½-digit process monitors with full-size

LCD displays. This super-low loop-drop guarantees a maximum burden of no more than

100 Ohms! And because it’s loop-powered, all operating power is derived directly from the

loop current itself; no separate power source is required! Their floating 2-wire design allows

DMS-30LCDA-4/20 Series process monitors to be connected anywhere in the current loop.

All decimal point and range-change selections are made via an eight-position DIP switch

which features vibration-resistant, gold-plated contacts—there are no cumbersome jumpers

or solder gaps to contend with. Both gain (span) and offset (zero) adjustments are performed

using 20-turn, non-interacting potentiometers. Four different models accommodate unipolar,

bipolar, positive, and inverse display-reading applications. The DMS-30LCDA-4/20 Series’

DIP switch and adjustment potentiometers can accommodate literally hundreds of different

input-current/output-reading combinations.

DMS-30LCDA-4/20 Series’ subminiature package houses a large, 0.40”/10.2mm, high-

contrast LCD display that can be read in virtually all lighting conditions—including full sunlight!

The two connections to the external loop are made via a reliable screw-type terminal block. For

environmentally demanding applications, an optional panel-mount bezel assembly, featuring

screw fasteners and a rubber gasket, provides excellent resistance to dust and moisture. All

these outstanding features combine to make the new DMS-30LCDA-4/20 Series ideal for all

your 4-20mA process-monitoring instrumentation needs.

FEATURES

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Super-low loop drop: 1.8V typical, 2.0V max.

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Self-powered 2-wire operation; no separate

supply required

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Unipolar, Bipolar, Positive, and Inverse Reading Models

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Improved-performance replacement for

DMS-30LCD-4/20S

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Subminiature package; Less than 0.90"

behind-the-panel depth

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Large, 0.40"/10.2mm high, sunlight-viewable LCD display

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Available in red, blue or green LED displays

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Non-interacting gain (span) and offset (zero)

20-turn potentiometers

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DIP-switch selectable range and decimal points

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Hundreds of different input-current/readout combinations

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Vibration-resistant package; reliable

screw-terminal input connections

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DMS-30LCDA-4/20 Series

Loop-Powered, 1.8V Drop, 4-20mA Process

Monitors with Full-Size LCD Displays

MPM_DMS30-LCDA.B02 Page 1 of 6

For full details go to

www.murata-ps.com/rohs

www.murata-ps.com