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

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

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

SIMPLIFIED SCHEMATIC DIAGRAM

　

DATA

3½ DIGIT A/D

CONVERTER

DC/DC

CONVERTER

BAND-GAP

REFERENCE

CIRCUIT

DIP SWITCHES

ZERO

ADJUST

GAIN

ADJUST

12

3

CURRENT TO

VOLTAGE

CONVERTER

+5V

–5V

DP3

DP2

DP1

R3

R7

+–

TB1

LOOP INPUT

5

6

1

1

1

2

2

2

34

56

3

3

4

4

5

6

ON

ON

ON

–

+