DMS-40PC-4 Datasheet, PDF (1/6 Pages) Murata Power Solutions Inc. – 4½ Digit, 4-20mA Input, LED Display Meters

DMS-40PC-4/20S
4½ Digit, 4-20mA Input, LED Display Meters
FEATURES
N Full-size, 0.52" (13.2mm) high, LED digits
N +7.5- 32Vdc model draws 30mA
N +24V Isolated-power models
N Dip-switch selectable range, offset, and decimal points
N _{Non-interacting, 20-turn, gain (span) and offset}
(zero) adjustments
N Insensitive to ground loops
N 103 Ohm max. loop burden
N Vibration-resistant package; reliable screw-terminal
connections
N Hundreds of different input/readout combinations
N 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 4½
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 4½ digit LED display
process monitors available.
4½ DIGIT A/D
CONVERTER
Range
Offset Gain
DATA
Ḥ
For full details go to
www.murata-ps.com/rohs
R3
R7
ZERO
ADJUST
GAIN
ADJUST
BAND-GAP
REFERENCE
CIRCUIT
+5V
DP1 DP2 DP3 DP4
ON
S1
1 234 56
ON
S2
1 234 56
CURRENT TO
VOLTAGE
CONVERTER
SG9
TB1 1 2
+5V
VOLTAGE
CONVERTER
1
TB2 1 2
~ -V is not connected to meter
ground on ‘-I’ suffix models.
+
–
4-20mA
CURRENT LOOP POWER
Figure 1. DMS-40PC-4/20S Simplified Schematic
+
–
+V
–V
POWER
SUPPLY INPUT
www.murata-ps.com
Technical enquiries email: [e-mail], tel: [phone]
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