DMS-40LCD-4 MURATA-PS [Murata Power Solutions Inc.], DMS-40LCD-4 Datasheet

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DMS-40LCD-4

Manufacturer Part Number
DMS-40LCD-4
Description
Manufacturer
MURATA-PS [Murata Power Solutions Inc.]
Datasheet
1.DMS-40LCD-4.pdf (5 pages)
FEATURES
Loop-powered, no power supply required!
2.9V typical loop-drop; 190-Ohm (max.) loop
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
www.murata-ps.com/rohs
For full details go to
　
ADJUST
R3
ZERO
+5V
REFERENCE
CONVERTER
BAND-GAP
CIRCUIT
DC/DC
–5V
ADJUST
GAIN
R7
www.murata-ps.com
Figure 1. DMS-40LCD-4/20S Simplified Schematic
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!
±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
condition—including full sunlight!
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.
S1
The DMS-40LCD-4/20S’s ultra-low 2.9V typical loop-drop (190-Ohm burden) makes it
The DMS-40LCD-4/20S's input, span, and offset circuits all employ super-stable,
All range-change and decimal point selections are made by configuring two gold-plat-
1
1
1
2
2
Range
4½ DIGIT A/D
CONVERTER
3
3
CURRENT TO
CONVERTER
ON
ON
VOLTAGE
4
4
Offset
5
5
DMS-40LCD-4/20S Series
6
6
Ultra-Low 2.9V Loop-Drop 4½ Digit
Gain
Technical enquiries email: sales@murata-ps.com, tel:
S2
DATA
LCD Display Process Monitor
1
1
1
2
2
Current Loop Input
3
3
ON
ON
MPM_DMS401LCD-420S.D02 Page 1 of 5
4
4
+
4-20mA
1
DP1
+
TB1
5
5
–
2
–
6
6
DP2
DP3
+1 508 339 3000
DP4

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DMS-40LCD-4 Summary of contents

Page 1

... 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. ...

Page 2

... Using the chart below as a guide, the DMS-40LCD-4/20S’s decimal points can be configured to suit the user’s particular readout requirements. To enable a desired decimal point place its DIP switch to the ON position (up). Please note that the decimal points are merely placeholders, that is, they can all all off ...

Page 3

... The following procedure must be performed as the first re-calibration step every time DIP-switches S1 and S2 are reconfigured to select a new display range. The following procedure assumes the DMS-40LCD-4/20S is initially completely mis-adjusted, i.e., both potentiometers and DIP-switches S1 and S2 are randomly set. Make sure that all DIP-switch actuators are pushed as far as they will go to their designated ON (closed) or OFF (open) positions ...

Page 4

... SUPPLY – PROGRAMMABLE LOGIC CONTROLLER – + 4-20mA + (TB1-1) – (TB1-2) 4-20mA Figure 2. Typical DMS-40LCD-4/20S Connections www.murata-ps.com DMS-40LCD-4/20S Series Ultra-Low 2.9V Loop-Drop 4½ Digit LCD Display Process Monitor DMS-40LCD-4/20S A/D Vsig R3 – Technical enquiries email: sales@murata-ps.com, tel: MPM_DMS401LCD-420S.D02 Page ...

Page 5

... USA: Canada: UK: France: Germany: Japan: 11/25/08 China: © 2008 Murata Power Solutions, Inc. Singapore: www.murata-ps.com DMS-40LCD-4/20S Series Ultra-Low 2.9V Loop-Drop 4½ Digit LCD Display Process Monitor 0.90 (22.9) DMS-40LCD-4/20S ® ® 2.09 0.040 (53.1) (1.02) 2.17 (55.1) FRONT VIEW DP3 DP4 S2 S2 (SW5) ...

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