DMS-20LCD-4 MURATA-PS [Murata Power Solutions Inc.], DMS-20LCD-4 Datasheet

DMS-20LCD-4

Manufacturer Part Number

DMS-20LCD-4

Description

Manufacturer

MURATA-PS [Murata Power Solutions Inc.]

Datasheet

1.DMS-20LCD-4.pdf (6 pages)

Current page: 1 of 6
Download datasheet (238Kb)

FEATURES

SIMPLIFIED SCHEMATIC DIAGRAM

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

Self-powered, no separate supply required

Unipolar, Bipolar, and Positive Reading Models

Subminiature package—Less than 0.90” behind-the-

panel depth

Large, 0.37"/9.4mm high, sunlight-viewable

LCD display

Non-interacting gain (span) and offset (zero) 20-turn

potentiometers

DIP-switch selectable range and decimal points

Hundreds of different input/readout combinations

Vibration-resistant package; reliable screw-terminal

input connections

www.murata-ps.com/rohs

For full details go to

+5V

REFERENCE

CONVERTER

BAND-GAP

ADJUST

CIRCUIT

DC/DC

ZERO

–5V

ADJUST

GAIN

www.murata-ps.com

priced, 4-20mA input, 3½ digit LCD-display process monitors: 1.8V typical, 2.0V max. This

super-low drop means its nominal loop resistance (burden) is less than 100 Ohms! All op-

erating power is derived solely from the 4-20mA loop current—no separate power source

is required! The simple 2-wire hookup allows the DMS-20LCD-4/20 Series to be connected

anywhere in the loop

switch featuring vibration-resistant, gold-plated contacts—there are no jumpers or solder

gaps to ever open or close. Both gain (span) and offset (zero) adjustments are performed

with precision, 20-turn potentiometers. Three different models are available for unipolar,

bipolar, and positive display reading applications. The DMS-20LCD-4/20’s DIP switch and

adjustment potentiometers can accommodate literally hundreds of different input-current/

output-reading combinations. And, connections to the current loop are made via a reliable,

two-position, screw-type terminal block.

high digits, LCD display that can be read in virtually all lighting conditions—including direct

sunlight. An optional bezel assembly, 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-20LCD-4/20 Series the perfect

meters for OEM 4-20mA current-loop process monitoring instrumentation.

The DMS-20LCD-4/20 Series produces the lowest loop voltage-drop of any comparably

The DMS-20LCD-4/20 Series’ subminiature package houses a large, 0.37"/9.4mm

All decimal-point and range-change selections are made via a six-position DIP

3½ DIGIT A/D

CONVERTER

CURRENT TO

CONVERTER

VOLTAGE

4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop

DMS-20LCD-4/20 Series

DATA

Technical enquiries email: sales@murata-ps.com, tel:

DIP SWITCHES

3½ Digit LCD Display Process Monitors

DP1

DP2

LOOP INPUT

MPM_DMS20LCD-420.B02 Page 1 of 6

TB1

DP3

–

+1 508 339 3000

Related parts for DMS-20LCD-4

DMS-20LCD-4 Summary of contents

Page 1

... Ohms! All op- erating power is derived solely from the 4-20mA loop current—no separate power source is required! The simple 2-wire hookup allows the DMS-20LCD-4/20 Series to be connected anywhere in the loop All decimal-point and range-change selections are made via a six-position DIP switch featuring vibration-resistant, gold-plated contacts— ...

Page 2

... Case Material Weight 0.6 ounces (17 grams) The DMS-20LCD-4/20, using any of the DIP-switch settings described above, can withstand overcurrents, including those resulting from accidental reverse- polarity connections ±40mA without sustaining any damage. Because DATEL's DMS-4/20 loop-powered meters employ active circuitry to convert the loop current into a voltage, the meters' effective series impedance varies in a manner that maintains the loop voltage drop constant over the full 4-to-20mA current range. Listed impedance speciﬁ ...

Page 3

... Example #3 below illustrates this concept. Please contact DATEL if there is any doubt as to whether or not the DMS-20LCD-4/20P can be conﬁgured for your display readings requirements. www.murata-ps.com DMS-20LCD-4/20 Series 3½ Digit LCD Display Process Monitors 20mA and adjust R7 so the display reads "1.00". Apply 4mA and verify that the display reads " ...

Page 4

... The ﬁrst step when conﬁguring the DMS-20LCD-4/20P for the ﬁrst time, or when selecting a new range set R3 fully counterclockwise and R7 fully clockwise (roughly 22 turns) to their minimum offset/minimum span posi- tions, respectively. The next step is to calculate the required display differential-reading; this is accomplished by subtracting the desired 4mA display reading from the desired 20mA display reading, disregarding decimal points ...

Page 5

... ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY 4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop PROGRAMMABLE LOGIC CONTROLLER – (TB1-1) 4-20mA 4-20mA – (TB1-2) +24V Shown for illustrative purposes only, may not be present in all applications Figure 2. Typical DMS-20LCD-4/20 Connection Diagram 0.187 (4.75) 1.280 (32.51) 0.838 (21.29) 0.145 (3.68) 0.116 (2.95) www.murata-ps.com DMS-20LCD-4/20 Series 3½ ...

Page 6

... USA: Canada: UK: France: Germany: Japan: 11/25/08 China: © 2008 Murata Power Solutions, Inc. Singapore: www.murata-ps.com DMS-20LCD-4/20 Series 3½ Digit LCD Display Process Monitors 0.90 (22.9) 0.040 (1.02) ® 0.80 (20.3) 0.88 (22.4) Mansﬁeld (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps ...

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