DMS-20PC-0/5 Series - Murata Power Solutions

DMS-20PC-0/5 Series
www.murata-ps.com
0-5V and 0-10V Input 3½ Digit, LED
Display Process Control Monitors
FEATURES
■
Accepts 0-5V and 0-10V inputs
■
Large, easy-to-read, 0.37"/9.4mm LED display
■
Choice of 5 LED power/color options
■
High input impedance, 100kΩ
■
+5V to +40V model draws 9mA typ.
■
Miniature size: 1.38" x 1.25" x 0.95"
■
High-quality, 20-turn, span (gain) and zero (offset)
adjustments
■
DIP-switch selectable range and decimal points
■
Vibration-resistant package; Reliable screw-terminal
input connections
■
Hundreds of different input/readout combinations
DATEL's DMS-20PC-0/5 Series are the world's smallest, full-featured, 0-5V input
process control monitors. Their large, easy-to-read, 0.37"/9.4mm LED displays are
available in a choice of 4 LED color/intensity options: standard red, standard green,
super-bright red, and low-power red. Two power supply input ranges are also available:
the industry-standard +5V and a wide-range +5V to +40V (which typically draws 9mA at
+24V).
Gain (span) and offset (zero) adjustments are performed with on-board, precision,
20-turn potentiometers. All decimal-point and range-change selections are made on an
8-position, vibration-resistant, gold-plated DIP switch. Unlike competitive meters, there
are no jumpers or solder gaps to open or close, and to further enhance reliability, the
entire assembly utilizes 100% soldered connections. Both power-supply and input-signal
connections are made via reliable screw-type terminal blocks.
The DMS-20PC-0/5's DIP switch and potentiometers accommodate hundreds of inputvoltage/output-reading combinations. This practically eliminates the need for more costly,
long-lead-time, factory "specials" in applications which use several different-range meters.
A supplied bezel assembly––featuring metal fasteners and a rubber gasket––simplifies
panel mounting and also provides excellent resistance to environmental dust and moisture.
All these outstanding features combine to make the DMS-20PC-0/5 the perfect meter for
prototype and OEM, 0-5V input, process control monitoring.
SIMPLIFIED SCHEMATIC DIAGRAM
DMS-20PC-0/5
3½ Digit
A/D Converter
DATA
–5V +5V
DP1
DP2 DP3
N.C.
R3
R7
Zero
Adjust
Gain
Adjust
ON
DIP Switches
1
2
3
4
5
6
7
8
N.C.
+5V
Band-Gap
Reference
Circuit
DC/DC
Converter
1
TB1
+
For full details go to
www.murata-ps.com/rohs
+5V
–5V
2
1
TB2
–
HI LO
Signal Input
+
–5V
2
–
+V –V
Power Supply Input
Figure 1. DMS-20PC-0/5 simplified schematic
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08 Jan 2010
MPM_DMS20pc_5V.B06 Page 1 of 4
DMS-20PC-0/5 Series
0-5V and 0-10V Input 3½ Digit, LED
Display Process Control Monitors
Performance/Functional Specifications
TECHNICAL NOTES
Typical at TA = +25°C, unless otherwise noted.
Inputs
Min.
Typ.
Max.
Units
Full Scale Input Range ➀
4.9
5.0
5.1
Volts
Input Impedence
100
–
140
kΩ
–
–
±40
Volts
Overvoltage Protection ➁
Performance
Sampling Rate
1. Input Configuration: The DMS-20PC-0/5 has its input low terminal
(TB1 "LO") internally connected to the power supply ground terminal
(TB2 "–V"). This connection effectively places the meter's input in a
single-ended configuration. In some applications, single-ended inputs
can cause ground-loop induced errors (the meter's display becomes
unstable or bounces). This occurs because the LED drive currents
flow through both the –V terminal and the signal LO terminal.
2.5 reading per second
Accuracy (1 minute warm-up):
Temperature Drift (0 to +60°C)
±0.05%FS ±1 Count
–
±0.15
±0.3
Cnts/°C
Power Supply Requirements
DMS-20PC-0/5-5RS (90mA max.)
+4.75
+5.00
+5.25
Volts
DMS-20PC-0/5-5GS, -5BS (120mA max.)
+4.75
+5.00
+5.25
Volts
DMS-20PC-0/5-5RL 15mA max.)
+4.75
+5.00
+5.25
Volts
DMS-20PC-0/5-5RH (90mA max.)
+4.75
+5.00
+5.25
Volts
DMS-20PC-0/5-24RL (15mA max.)
+4.75
–
+40.0
Volts
Display
Display Type and Size
3½ digit, 0.37"/9.4mm high LED
Polarity Indication
"–" for negative VIN
Overrange Indication
If suspected ground-loop errors are encountered, and the input signal
LO terminal is externally connected to –V somewhere else in the
system, try removing the connection to TB1 "LO". Inputs which have
no ground-return connection to –V (commonly referred to as "floating
inputs") must have their most negative potential tied to TB1 "LO".
Please consult DATEL for more information.
Applications which require electrical isolation between the input
signal source and the system power supply must use a separate
transformer-isolated supply to power the meter.
2. Panel Mounting: In most standard through-the-panel installations,
the DMS-20PC-0/5 must be secured to the panel with DMS-BZL4
bezel assemblies (see the Mechanical Specifications section for more
information).
"–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Case Material
0
–
+60
°C
–20
–
+75
°C
0
–
95
%
Polycarbonate
Weight
0.6 ounces (17 grams)
➀ The DMS-20PC-0/5 can also be used in most 0-10V applications. See the section
on 0-10V inputs for more information. See Note 3 on Table 1.
➁ INPUT LO (TB1 "–LO") is internally connected to the power return (TB2 "–V").
Overvoltage specifications apply to the INPUT HI (TB1 "+HI") connection.
OPERATING AND SETUP INSTRUCTIONS
As shipped, the DMS-20PC-0/5 is factory calibrated to read "000" for
a 0.0V input and "1999" for a 5.0V input. The following worst-case
procedure assumes the DMS-20PC-0/5 is completely mis-adjusted, i.e.,
both potentiometers and the DIP switches are randomly set.
1. Set R7 (full scale span/gain adjust) and R3 (zero/offset adjust) fully
clockwise, roughly 22 turns, and place SW1-SW8 to OFF (down
position).
2. Select DIP switch setting #1 in Table 1.
3. Apply a precision 0.0V input and adjust R3 until the meter's display
reads "000".
Ordering Information
DMS-20PC-0/5-5RS-C
DMS-20PC-0/5-5GS-C
DMS-20PC-0/5-5BS-C
DMS-20PC-0/5-5RL-C
DMS-20PC-0/5-5RH-C
DMS-20PC-0/5-24RL-C
+5V supply, standard-intensity red LED's
+5V supply, standard-intensity green LED's
+5V supply, bright blue LED's
+5V supply, low-power red LED's
+5V supply, high-intensity red LED's
+5V to +40V supply, low-power red LED's
DMS-20-CP
Panel cutout punch
Note: A DMS-BZL4 bezel assembly with a sealing gasket is supplied with each meter.
4. Apply a precision 5.0V input and adjust R7 until the meter's display
reads "1999". Repeat steps 3 and 4 to make sure the adjustments
do not affect one another.
5. Select the appropriate decimal point by setting SW6, SW7 or SW8 to
ON (DP1, DP2 or DP3 respectively).
NOTE: The "000" to "1999" display readings referred to in the
instructions above are for illustrative purposes only. If other display
readings such as "000" to "1200" are desired, refer to the DIPSwitch Settings Tables for SW1-SW4 settings. (SW5 is reserved for
future use, it has no affect on display operation.) The initial setting
of R3 and R7 fully clockwise is recommended in the adjustment
procedure for all the following examples.
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08 Jan 2010
MPM_DMS20pc_5V.B06 Page 2 of 4
DMS-20PC-0/5 Series
0-5V and 0-10V Input 3½ Digit, LED
Display Process Control Monitors
Examples (0-5V Inputs)
4. Desired display readings are:
1. Desired display readings are:
1.0V input = "000"
6.0V input = "090"
ON
0.0V input = "0.00"
5.0V input = "6.00"
1
2
3
4
5
6
7
8
Use DIP-switch setting #3 in Table 1 and enable decimal point DP2
via SW7. Apply 0.0V and adjust R3 so the display reads "0.00".
Apply 5.0V and adjust R7 so the display reads "6.00".
2. Desired display readings are:
ON
0.0V input = "000"
5.0V input = "800"
1
2
3
4
5
6
7
ON
0.0V input = ".000"
5.0V input = ".250"
1
2
3
4
5
6
7
1
Table 1. 0-5V DIP-Switch Settings ➂
0.0V Input
1. 000
2. 000
3. 000
4. 000
5. 000
6. 000
7. 000
8. 000
5.0V Input
1200-1999
700-1200
400-700
300-400
190-300
120-190
100-150
90-140
SW2
SW3
SW4
Off
On
Off
Off
Off
Off
Off
On
Off
Off
On
Off
On
Off
On
On
Off
Off
Off
On
On
On
On
On
Off
Off
Off
Off
Off
On
On
On
4
5
6
7
8
Even though this input is positioned between +1.0V and +6.0V,
it still meets the 5V full scale input range listed in the Functional
Specifications section. Use DIP-switch setting #8 in Table 1. Apply
1.0V and adjust R3 so the display reads "000". Apply 6.0V and adjust
R7 so the display reads "090". With this type of input, it is advisable
to recheck both input levels to be sure the potentiometer settings do
not affect one another.
0-10V Inputs
While the DMS-20PC-0/5 is optimized for operation with 0-5V inputs,
its versatile input stage can also accommodate most 0-10V applications. The meter's zero/offset potentiometer (R3) has enough adjustment range to produce a "000" display reading with input signal levels
between –0.1V and +1.0V. Table 2. summarizes the available ranges
when the DMS-20PC-0/5 is used with 0-10V inputs.
Example (0-10V Inputs)
1. Desired display readings are:
ON
0.0V input = "000"
10.0V input = "500"
SW1
3
8
Use DIP-switch setting #5 in Table 1 and enable decimal point DP1
via SW6. Apply 0.0V and adjust R3 so the display reads "000". Apply
5.0V and adjust R7 so the display reads ".250".
Display Reading
2
8
Use DIP-switch setting #2 in Table 1. Apply 0.0V and adjust R3 so
the display reads "000". Apply 5.0V and adjust R7 so the display
reads "800". For these display readings, no decimal points are
used. Set SW6, SW7 and SW8 to OFF.
3. Desired display readings are:
ON
➂ The DMS-20PC-0/5 is optimized for handling 5V signal ranges that are
positioned between –0.1V and +6.0V. As such, input ranges can be anywhere
between –0.1V to +4.9V and +1.0V to +6.0V as long as their full range is
5 Volts. The meter's zero/offset potentiometer (R3) has enough adjustment
range to produce a "000" display reading for input signal levels between
– 0.1V and +1.0V.
1
2
3
4
5
6
7
8
Use DIP switch setting #4 in Table 2. Apply 0.0V and adjust R3 so
the display reads "000". Apply 10.0V and adjust R7 so the display
reads "500".
Table 2. 0-10V DIP-Switch Settings
Display Reading
0.0V Input
1. 000
2. 000
3. 000
4. 000
5. 000
6. 000
7. 000
10.0V Input
1400-1999
800-1400
600-800
380-600
240-380
200-300
180-280
SW1
SW2
SW3
SW4
On
Off
Off
Off
Off
Off
On
Off
On
Off
On
Off
On
On
Off
Off
On
On
On
On
On
Off
Off
Off
Off
On
On
On
Please note the DMS-20PC digital panel meter from which the DMS-20PC-0/5
is derived has an accuracy specification of ±2 counts (max.). Thus, it may not
always be possible to obtain the exact desired display readings.
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08 Jan 2010
MPM_DMS20pc_5V.B06 Page 3 of 4
DMS-20PC-0/5 Series
0-5V and 0-10V Input 3½ Digit, LED
Display Process Control Monitors
MECHANICAL SPECIFICATIONS
TOLERANCES:
WIRE SIZE:
STRIPPING LENGTH:
2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
18 to 26 AWG (Solid or stranded)
0.20" (5.08mm)
0.95
(24.1)
MADE IN USA
DMS-20PC-0/5
®
12
0.040
(1.02)
1
2
3
4
5
6
7
0.040
(1.02)
1.30
(33.0)
0.44
(11.2)
TYP.
0.80
(20.3)
0.88
(22.4)
1.38
(35.1)
1
ON
DIP
Switches
®
Back View
0.040
(1.02)
1.25
(31.8)
8
Front View
Zero/Offset
Adjust
+
R3
–
+
–
R7
+ – + –
Gain/Span
Adjust
TB1
Signal
Input
TB2
Power
Input
DP1
(SW6)
DP2
DP3
(SW7) (SW8)
BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT
#2-56 INSERT
0.156 (3.96) DEEP
FRONT VIEW
0.187
(4.75)
BEZEL INSTALLATION
1.280
(32.51)
PANEL
®
1.07
(27.18)
PANEL CUTOUT
0.093 (2.362) DIA
(4 REQUIRED)
1.336 (33.93)
0.116 (2.95)
GASKET
0.838
(21.29)
BEZEL
0.145 (3.68)
1.626 (41.30)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
®
1.826 (46.38)
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2010 Murata Power Solutions, Inc.
www.murata-ps.com/locations
email: sales@murata-ps.com
08 Jan 2010
MPM_DMS20pc_5V.B06 Page 4 of 4