Datel DMS-40PC-4/20S Series Manual

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www.datel.com

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)
R 3
Z E R O
A D J U S T
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · E-mail: sales@datel.com · Internet: www.datel.com
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 supply, 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 enhance 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.
R a n g e
R 7
G A I N
A D J U S T
B A N D - G A P
R E . E R E N C E
C I R C U I T
S 1
1 1 2 2
1
+ 5 V
➀ -V is not connected to meter
ground on '-I' suffix models.
Figure 1. DMS-40PC-4/20S Simplified Schematic
4 ½ D I G I T A / D
C O N V E R T E R
O f f s e t G a i n
D A T A
O N O N O N
O N
S 2
3 4 5 6 4
3 4 5 6 1 1 1 2 2 3 3 4
S G 9
C U R R E N T T O
V O L T A G E
C O N V E R T E R
T B 1
1
+
4 - 2 0 m A
C U R R E N T L O O P P O W E R
®
DMS-40PC-4/20S
4½ Digit Process Monitors
with Full-Size LED Displays
New +24V Isolated-Power Models
D P 4
D P 1 D P 2 D P 3
+ 5 V
5 5 6 6
V O L T A G E
C O N V E R T E R
T B 2
2 1 2
– + –
+ V – V
P O W E R
S U P P L Y I N P U T
®
4-20mA Input
1