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DMS-40LCD-4/20S-C

Description
digital panel meters 20.4ma max 2.9V drop 4 1/2 digit lcd
CategoryTopical application    Test and measurement   
File Size179KB,5 Pages
ManufacturerMurata
Websitehttps://www.murata.com
Environmental Compliance  
Download Datasheet Parametric View All

DMS-40LCD-4/20S-C Overview

digital panel meters 20.4ma max 2.9V drop 4 1/2 digit lcd

DMS-40LCD-4/20S-C Parametric

Parameter NameAttribute value
ManufactureMu
Product CategoryDigital Panel Meters
RoHSYes
Equipment TypeMeters - Line Powered
Display TypeLCD, 4.5 Digi
Operating Supply Curre4 mA to 20 mA
Input Curre4 mA to 20 mA
Case Heigh23 mm
Case Length26 mm
Case Width55 mm
Description/Functi4-20 mA current loop inpu
Dimensions26 mm L x 55 mm W x 23 mm H
Mounting StylePanel
PackagingBulk
Factory Pack Quantity12
www.murata-ps.com
DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
FEATURES

Loop-powered, no power supply required!

typical loop-drop; 190-Ohm (max.) loop
2.9V
impedance

Dip-switch-selectable range, offset, and
decimal points

Hundreds of different input/readout combinations

Non-interacting gain (span) and offset (zero)
20-turn potentiometers

Large, 0.40” (10.0mm) high, sunlight-viewable
LCD digits

Miniature size: 2.17" x 0.92" x 0.90"
(55mm x 23mm x 23mm)

Vibration-resistant package; reliable screw-
terminal connections

100% soldered connections
The DMS-40LCD-4/20S’s ultra-low 2.9V typical loop-drop (190-Ohm burden) makes it
ideal for use in 4-20mA process monitoring applications which have two or more series-
connected loop-monitoring devices. The low loop-burden means it can be used in current
loops that are powered from supply voltages as low as +8Vdc! The DMS-40LCD-4/20S is
self-powered; all required operating power is derived directly from the current loop itself.
It requires no separate dc power supply or special grounding considerations and can be
connected ANYWHERE in the loop!
The DMS-40LCD-4/20S’s input, span, and offset circuits all employ super-stable, ±0.5%
thin-film chip resistors. Long-term stability and accuracy are assured by driving these tight-
tolerance resistors with an ultra-stable, ±0.2% band-gap voltage reference. Unlike many
competitor’s designs, the two precision 20-turn span and zero adjust poten- tiometers
do not interact with one another. Its full-size, 0.40” (10.0mm) high-contrast 4½ digit LCD
display offers 19,999 counts of resolution and can be read in virtually any lighting condi-
tion—including full sunlight!
All range-change and decimal point selections are made by configuring two gold-plat-
ed, vibration-resistant, six-position DIP switches. The two connections to the current loop
are made via a reliable, screw-type terminal block. To further enhance reliability, the design
features 100% soldered connections—no troublesome zebra/elastomercic connectors are
used. All these outstanding features make the DMS-40LCD-4/20S the highest quality, most
rugged, 4½ digit, LCD-display process monitor available.
4½ DIGIT A/D
CONVERTER
Range
Offset
Gain
DATA
R3
ZERO
ADJUST
R7
GAIN
ADJUST
BAND-GAP
REFERENCE
CIRCUIT
ON
ON
DP1
DP2
DP3
DP4
S1
1
2
3
4
5
6
S2
1
2
3
4
5
6
+5V
–5V
TB1
CURRENT TO
VOLTAGE
CONVERTER
+
DC/DC
CONVERTER
 
1
2
+
For full details go to
www.murata-ps.com/rohs
Figure 1. DMS-40LCD-4/20S Simplified Schematic
4-20mA
Current Loop Input
www.murata-ps.com/support
MPM_DMS-40LCD-420.C01
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