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PDF DMS-20LCD-420 Data sheet ( Hoja de datos )
| Número de pieza | DMS-20LCD-420 | |
| Descripción | Digit LCD Display Process Monitors | |
| Fabricantes | Murata | |
| Logotipo |  |
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www.murata-ps.com
DMS-20LCD-4/20 Series
4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop
3½ Digit LCD Display Process Monitors
FEATURES
■ 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
SIMPLIFIED SCHEMATIC DIAGRAM
The DMS-20LCD-4/20 Series produces the lowest loop voltage-drop of any comparably
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
All decimal-point and range-change selections are made via a six-position DIP
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.
The DMS-20LCD-4/20 Series’ subminiature package houses a large, 0.37"/9.4mm
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.
R3 R7
ZERO GAIN
ADJUST ADJUST
BAND-GAP
REFERENCE
CIRCUIT
3½ DIGIT A/D
CONVERTER
123
DATA
DP1 DP2 DP3
ON
123456
DIP SWITCHES
For full details go to
www.murata-ps.com/rohs
+5V –5V
DC/DC
CONVERTER
CURRENT TO
VOLTAGE
CONVERTER
www.murata-ps.com/dpm
TB1
12
+–
LOOP INPUT
MPM_DMS20LCD-420.B03 Page 1 of 6
1 page  
DMS-20LCD-4/20 Series
4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop
3½ Digit LCD Display Process Monitors
PROGRAMMABLE LOGIC CONTROLLER ➀
TRANSDUCER
INPUT
TRANSMITTER &
SIGNAL CONDITIONER
+24Vdc
SUPPLY
+24V
+
–
+
+
4-20mA
–
+(TB1-1)
– –4-20mA
(TB1-2)
DMS-20LCD-4/20
GAIN
R7
+
A/D
Vsig
R3
–
ZERO
➀ Shown for illustrative purposes only, may not be present in all applications
Figure 2. Typical DMS-20LCD-4/20 Connection Diagram
BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT
#2-56 INSERT
0.156 (3.96) DEEP
FRONT VIEW
0.187
(4.75)
1.280
(32.51)
BEZEL INSTALLATION
PANEL
1.826 (46.38)
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
1.07
(27.18)
0.838
(21.29)
1.336 (33.93)
1.626 (41.30)
0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
0.145
(3.68)
0.116
(2.95)
BEZEL
RETAINING CLIP INSTALLATION
PANEL
www.murata-ps.com/dpm
MPM_DMS20LCD-420.B03 Page 5 of 6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DMS-20LCD-420.PDF ] | |
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