DMR20-10-DCM Datasheet, PDF (1/4 Pages) Murata Manufacturing Co., Ltd. – 2-Wire, Self-Powered, Auto-Ranging DC Voltage Monitor

www.murata-ps.com
FEATURES
Self-powered, requires only two connections
_{Auto-ranging 6 to 75Vdc input range}
Installs in round “oiltight” 1.20 inch (30.5mm) cutouts
Reverse polarity protected to –100Vdc
Four-digit LED display with overvoltage indication
Digital replacement for analog panel meters
Screw-style terminal block simplifies installation
Self-resetting internal fuse for long-term reliability
Provides moisture resistance to IP67/NEMA 6
Supplied with EPDM rubber gasket and plastic hex nut
Panel knockout punches and tooling available
Performance/Functional Specifications
Typical at Ta = +25°C, unless otherwise noted
DC Input (TB1)
Input voltage range ➀ +6 to +75Vdc
Current Consumption
@Vin = 75.0Vdc: 7mA (max.)
Reverse Polarity Protection _{-100Vdc (min.)}
Performance
Sampling Rate
Resolution
Accuracy @ +25°C
HI Range ➁
LO Range ➁
Overrange Indication ➂
Temperature Drift
2.5 readings/second
0.01Vdc in LO Range;
0.1Vdc in HI Range
±0.2V (typ.), ±0.4V (max.)
±0.03V (typ.), ±0.06V (max.)
See note 3
±0.003V/°C (typ.)
Mechanical
Dimensions
1.50"diameter x 1.08 depth"
(38.1 x 27.4mm)
Display Type
Four digit, LED, 0.30" high (7.6mm)
Weight
0.6 ounces (18 grams)
Case Material
with nut and gasket
Polycarbonate
Terminal Block Torque
3.6 in-lbs (0.4 N-m)
Wire Size And Type
18-22AWG (0.83-0.33mm²) copper,
solid or stranded
Wire Insulation Strip Length _{0.25" (6.4mm)}
Environmental
Operating Temperature _{–25 to +60°C}
Storage Temperature
–40 to +75°C
Humidity (non-condensing) _{0 to 85%}
NANO
DMR20-10-DCM
2-Wire, Self-Powered,
Auto-Ranging DC Voltage Monitor
Murata Power Solutions’ new DMR20-10-DCM self-powered, auto-ranging DC voltage
monitors are designed to measure and display the outputs the most popular DC power
systems. Simply connect any 6 to 75V DC power source and these meters are fully opera-
tional—no additional components or power sources are required.
Their large, 0.30"/7.6mm, bright LED displays can be easily read from 10 feet away (3
meters). These auto-ranging meters accurately display DC voltages with 0.01V in the LO
Range (below 51V), or 0.1V resolution in the HI Range (above 51 V). A built-in resettable
fuse assures long term reliability. All DMR20-10-DCM’s employ a 13-bit A/D converter
and precision metal-film resistors to achieve outstanding performance over an operating
temperature range of –25 to +60°C.
The DMR20-10-DCM is housed in a rugged, round polycarbonate case that provides excel-
lent protection against moisture, dust, shock and vibration. Panel installation is straightfor-
ward: using readily available tooling, simply drill and punch a 1.2 inch (30.5mm) diameter
hole and anti-rotation notch, insert the meter and gasket into the panel, and securely fasten
the meter using the supplied hex nut. The supplied hardware is designed to provide protec-
tion to IP67/NEMA 6.
Ordering Information
DMR20-10-DCM-R-C 6 to 75Vdc voltage monitor (Red LED)
Tooling
DMR20-1-KP
1.2" (30.5mm) Round knockout punch
DMR20-2-KP
(no keying notch)
1.2" (30.5mm) Round knockout punch
DMR20-3-KP
(with four keying notches)
1/8" and 3/16" (3.2 and 4.7mm)
key-notch nibbler tool
Note: An M30 x 1.5 nylon hex nut and EPDM sealing gasket are supplied with each meter.
The “-C” suffix denotes RoHS compliance.
➀ Operation and accuracy at inputs above or below these ranges are not specified.
➁ When auto-range operation is enabled via jumper JP1 and Vin is between 6V to 51V, the
displayed resolution is 0.01V (i.e., the unit is in LO Range). When Vin is 51V and above, display
resolution is 0.1V (i.e., the unit is in HI Range). When the unit is in the HI range and Vin drops
below 49V, it will auto-range back to the LO Range.
➂ When Vin is between 75V and 80V, the display will alternate from dim to normal intensity at
approximately one second intervals. When Vin exceeds 80V, display will flash on and completely
off at approximately one second intervals. Continuous operation above 80V will permanently
damage the meter and void its warranty.
Ḥ
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MPM_DMR20-10-DCM.A01 Page 1 of 4