DMR20-0/5 Series
0-5V Input, 3½ Digit LED Display
Round Process Monitors
FEATURES
Provides scaling of 0-5V and 0-10V process signals
High-quality, 20-turn,
Operates from industrial 5V /span (gain) /and zeropower supplies
12V / 24V 36V dc (offset)
Fits round 1.21 inch [30.7 mm] cutouts; less than 1.00 inch [25.4
mm] behind-the-panel depth
High input impedance, 100k Ω minimum
Easy-to-read, 0.30 inch [7.6 mm] high red or green LED display
Supplied with EPDM rubber gasket and hex nut
High-quality, 20-turn, span (gain) and zero (offset) adjustments
Gold-plated DIP-switches for range and decimal points: Reliable
screw-terminal input connections
Rugged, polycarbonate housing, one-piece package
Protected against dust and water submersion to IP67/NEMA 6
Murata Power Solutions’ new DMR20-0/5 Series are the world's first 0-5V input
process monitors designed to fit industry standard, 1.21 inch [30.7 mm] round panel
cutouts. Their large, easy-to-read, 0.30 inch [7.6 mm] digits are available in a choice of
red or green LED displays. For the ultimate versatility in industrial applications, these
new process monitors can be operated from any regulated source of 5V, 12V, 24V, or
36V dc power.
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 a
6-position, vibration-resistant, gold-plated DIP switch. Unlike competitive meters, there
are no jumpers or solder gaps to open or close. To further enhance reliability, the
entire assembly utilizes 100% soldered connections. Both power-supply and input-
signal connections are made via a reliable, 3-position, screw-type terminal block.
The DMR20-0/5's DIP switch and potentiometers accommodate hundreds of input-
voltage / output-reading combinations. This practically eliminates the need for more costly,
long-lead-time, factory "customs" in applications which use several different-range meters.
An EPDM rubber gasket and hex nut simplify installation and provide IP67 / NEMA 6
protection to environmental dirt and moisture, including water submersion to 3 feet (1
meter).
SIMPLIFIED SCHEMATIC DIAGRAM
.
Figure 1
Simplified Schematic
Diagram
http://www.murata-ps.com/en/support/rohs-
compliance.html
For full details go to:
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MPM_DMR20-0/5.A01
Page 1 of 5
DMR20-0/5 Series
0-5V and 0-10V Input 3½ Digit, LED
Display Process Control Monitors
Performance/Functional Specifications
Typical at T
A
= +25°C, unless otherwise noted.
Input
Full Scale Input Range
➀
Input Impedance
Overvoltage Protection
➁
Performance
Sampling Rate
Accuracy
(1 minute warm-up):
Temperature Drift
(0 to +60°C)
Power Supply Requirements
DMR20-0/5-R-C (7.5 mA max.)
DMR20-0/5-G -C (10 mA max.)
Display
Display Type and Size
Polarity Indication
Overrange Indication
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Case Material
Weight
0
–20
0
–
–
–
+60
+75
85
Polycarbonate
0.65 ounces (18.5 grams)
°C
°C
%
3½ digit, 0.30" [7.6 mm] high LED
"–" for negative V
IN
"–1_ _ _" for negative inputs "1_
_ _" for positive inputs
+5.0
+5.0
—
—
+40.0
+40.0
Volts
Volts
–
2.5 reading per second
±0.05% FS ±1 Count
±0.15
±0.3
Counts/°C
MMin.
4.9
100
–
Typ.
5.0
–
–
Max.
5.1
140
±40
Units
Volts
KΩ
Volts
TECHNICAL NOTES
1. Input Configuration:
The DMR20-0/5 has its signal input LO terminal
connected to its power supply ground terminal (TB1-2). This
connection effectively places the meter's input in a single-ended
configuration, that is, signal ground is connected directly to power
ground. In some applications, single-ended inputs may cause ground-
loop induced errors (the meter's display becomes unstable).
Applications which require electrical isolation between the input
signal ground and the system power supply ground must use a
separate transformer-isolated supply to power the meter.
2. Panel Mounting:
In most standard through-the-panel installations, the
DMR20-0/5 must be secured to the panel with the supplied M30 x 1.5
metric nut and gasket, see the Mechanical Specifications section for
more information.
OPERATING AND SETUP INSTRUCTIONS
As shipped, the DMR20-0/5 is factory calibrated to read "000" for a 0.0 V
input and "1900" for a 5.0 V input. The following worst-case procedure
assumes the DMR20-0/5 is completely miss-adjusted, i.e., both
potentiometers and the DIP switches are randomly set.
1. Set R7 (full scale span/gain adjust) fully counterclockwise, and R3
(zero/offset adjust) fully clockwise, roughly 22 turns, and place SW3-
SW6 to OFF (down position).
2. Select DIP switch setting #1 in Table 1.
3. Apply a precision 0.0 V input and adjust R3 until the meter's display
reads "000.”
4. Apply a precision 5.0 V input and adjust R7 until the meter's display
reads "1900.” Repeat steps 3 and 4 to make sure the adjustments do
not affect one another.
5. Select the appropriate decimal point by setting SW and SW2 per Table
3.
NOTE: The "000" to "1900" display readings referred to in the
instructions above are for instructional purposes only. If other display
readings are desired, refer to DIP-Switch Settings Tables 1 and 2 for
SW3-SW6 settings. The initial setting of R3 fully clockwise and R7
fully counterclockwise is recommended in the adjustment procedure
for all the following examples.
➀
The DMR20-0/5 can also be used in most 0-10V applications. See the section
on 0-10V inputs for more information.
➁
INPUT LO (TB1-2) shares a common connection with power ground (also TB1–2).
Overvoltage specifications apply to the INPUT HI (TB1-1) connection referenced
to TB1-2.
Ordering Information
DMR20-0/5-R-C
+5 to +50Vdc V Supply, Red LED’s
DMR20-0/5-G-C
+5 to +50Vdc V Supply, Green LED’s
Note: An M30 x 1.5 nylon metric hex nut and EPDM sealing gasket are
supplied with each meter. The “-C” suffix indicates RoHS compliance
Panel Knockout Tools:
DMR20-1-KP
DMR20-2-KP
DMR20-3-KP
1.22” [30.9 mm] punch (no keying notch)
1.21” [30.7 mm] punch with 4 keying notches
Keyway Punch tool
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MPM_DMR20-0/5.A01
Page 2 of 5
DMR20-0/5 Series
0-5 V Inputs
Examples (0-5V Inputs)
1.
Desired display readings
are: 0.0 V input = "0.00"
5.0 V input = "6.00"
Use DIP-switch setting #3 in Table 1 and enable decimal point DP2
by setting SW1 to ON and SW2 to OFF. Apply 0.0 V and adjust R3
so the display reads "0.00.” Apply 5.0 V and adjust R7 so the
display reads "6.00.”
2.
Desired display readings
are: 0.0 V input = "000"
5.0 V input = "800"
Use DIP-switch setting #2 in Table 1. Apply 0.0 V and adjust R3 so
the display reads "000.” Apply 5.0 V and adjust R7 so the display
reads "800.” For these display readings, no decimal points are
used, so set SW1 and SW2 both to ON.
3.
Desired display readings
are: 0.0 V input = ”000"
5.0 V input = ”250"
Use DIP-switch setting #5 in Table 1 and enable decimal point DP1
by setting SW1 to OFF and SW2 to ON. Apply 0.0 V and adjust R3
so the display reads "000.” Apply 5.0 V and adjust R7 so the display
reads ”250.”
4.
Desired display readings
are: 1.0 V input = ”000"
6.0 V input = ”090"
Even though this input is positioned between +1.0 V and +6.0 V, it
still meets the 5V full scale differential input range listed in the
Functional Specifications section. Use DIP-switch setting #8 in
Table 1. Apply 1.0 V and adjust R3 so the display reads “090’. With
this type of input, it is advisable to recheck both input levels to be
sure the potentiometer settings did not affect one another.
1
2
3
4
5
6
7
0-5V and 0-10V Input 3½ Digit, LED
Display Process Control Monitors
0-10 V Inputs
While the DMR20-0/5 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 –0.1 V
and +1.0 V. Table 2 summarizes the available ranges when the DMR20-
0/5 is used with 0-10V inputs.
Example (0-10V Inputs)
1.
Desired display readings are:
0.0 V input = "000"
10.0 V input = "500"
Use DIP switch setting #4 in Table 2. Apply 0.0 V and adjust R3 so
the display reads "000.” Apply 10.0 V and adjust R7 so the display
reads "500.”
Table 2
0-10 V DIP-Switch Setting
0.0 V Input
000
000
000
000
000
000
000
10.0 V Input
to 1400-1999
to 800-1400
to 600-800
to 380-600
to 240-380
to 200-300
to 180-280
SW3
On
Off
Off
Off
Off
Off
On
SW4
Off
On
Off
On
Off
On
On
SW5
Off
Off
On
On
On
On
On
SW6
Off
Off
Off
Off
On
On
On
Table 3
Decimal Point Settings (All Models)
Table 1
0-5V DIP-Switch Settings
➂
0.0 V Input
1
2
3
4
5
6
7
8
000
000
000
000
000
000
000
000
5.0 V Input
SW3
to 1200-1999 Off
to 700-1200
to 400-700
to 300-400
to 190-300
to 120-190
to 100-150
to 90-140
On
Off
Off
Off
Off
Off
On
SW4
Off
Off
On
Off
On
Off
On
On
SW5
Off
Off
Off
On
On
On
On
On
SW6
Off
Off
Off
Off
Off
On
On
On
SW1
Off
On
Off
On
SW2
Off
Off
On
On
Decimal Point
DP3
DP2
DP1
None
➂
The DMR20-0/5 is optimized for 0/5 V process input signals that range
between -0.1 V and +6.0 V. As such, input signal ranges can be anywhere
between -0.1 V and +6.0 V or between +1.0 V and +6.0 V, as long as the
differential value is 5.0 Volts. The meter’s zero/offset potentiometer (R3) has
enough adjustment range to produce a “000’ display reading for zero input signal
levels between -0.1 V and +1.0 V. As noted earlier, most 0-10 V inputs can also
be accommodated as indicated in Table 2.
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MPM_DMR20-0/5.A01
Page 3 of 5
DMR20-0/5 Series
0-5V Input, 3 ½ Digit LED Display
Round Process Monitors
CONNECTION DIAGRAM
Figure 2
Typical DMR20-0/5
Connection Diagram
INSTALLATION DIAGRAM
Figure 3
Panel Installation
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MPM_DMR20-0/5.A01
Page 4 of 5
DMR20-0/5 Series
0-5V Input, 3 ½ Digit LED Display
Round Process Monitors
MECHANICAL SPECIFICATIONS AND RECOMMENDED PANEL CUTOUT
http://www.murata-ps.com/en/3d/meters.html
Available Panel Knockout Tools:
DMR20-1-KP
DMR20-2-KP
DMR20-3-KP
1.22” [30.9 mm] punch (no keying notch)
1.21” [30.7 mm] punch with 4 keying notches
Keyway Punch tool
TB1 Recommended Wire Terminations:
WIRE SIZE: 18 to 26 AWG (Solid or stranded)
STRIPPING LENGTH: 0.20” [5.1 mm] Nominal
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to:
http://www.murata-ps.com/requirements/
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.
© 2015 Murata Power Solutions, Inc.
www.murata-ps.com/support
MPM_DMR20-0/5.A01
Page 5 of 5
