DMS-40PC-4/20S
4�½ Digit, 4-20mA Input, LED Display Meters
FEATURES
Full-size, 0.52" (13.2mm) high, LED digits
+7.5- 32Vdc model draws 30mA
+24V Isolated-power models
Dip-switch selectable range, offset, and decimal points
Non-interacting, 20-turn, gain (span) and offset
(zero) adjustments
Insensitive to ground loops
103 Ohm max. loop burden
Vibration-resistant package; reliable screw-terminal
connections
Hundreds of different input/readout combinations
Miniature size: 2.17" x 0.92" x 1.02"
(55mm x 23mm x 26mm)
The DMS-40PC-4/20S Series' superior design makes them ideal for use
in demanding 4-20mA process monitoring applications requiring a full 4�½
digits (0-19999) of display resolution. Their full-size, 0.52" (13.2mm) high,
LED displays can be read in virtually any lighting condition and are available
in green, high-intensity red, or low-power red.
Two operating power supply ranges are available: a wide-input +7.5 to
32V model for use with popular +12Vdc and +24Vdc industrial supplies, and
+4.75 to 5.25V models for use with +5V logic supplies. The reverse-polarity
protected +7.5-32V red LED model consumes only 30mA from a +24V sup-
ply, but still provides excellent display brightness.
The DMS-40PC-4/20'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%
bandgap voltage reference. And, unlike many competing designs, the two
precision 20-turn span and zero adjust potentiometers do not interact with
one another.
All range-change and decimal point selections are made by configuring
two gold-plated, vibration-resistant, six-position DIP switches. To further en-
hance reliability, both power supply and current loop connections are made
via reliable screw-type terminal blocks. All these outstanding features make
the DMS-40PC-4/20S Series meters the most rugged 4�½ digit LED display
process monitors available.
4�½ DIGIT A/D
CONVERTER
Range
Offset
Gain
DATA
R3
ZERO
ADJUST
R7
GAIN
ADJUST
DP1
DP2
DP3
DP4
BAND-GAP
REFERENCE
CIRCUIT
ON
S1
1
2
3
4
5
6
S2
1
2
3
4
5
6
ON
+5V
VOLTAGE
CONVERTER
SG9
+5V
CURRENT TO
VOLTAGE
CONVERTER
TB1
1
2
TB2
1
2
1
-V is not connected to meter
ground on ‘-I’ suffix models.
+
–
+
+V
–
–V
For full details go to
www.murata-ps.com/rohs
4-20mA
CURRENT LOOP POWER
POWER
SUPPLY INPUT
Figure 1. DMS-40PC-4/20S Simplified Schematic
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMS-40PC-420.D02
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MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
