NANO
DMR20-1-ACV
www.murata-ps.com
Self-Powered,
85 to 264Vac, LED Display Line Monitor
FEATURES
Universal 85 to 264Vac measurement range
Self-powered directly from the AC supply
Installs in “oiltight”1.20 inch (30.5mm) round cutouts
Four-digit LED display with overvoltage indication
Reads true-rms value to 0.1V resolution
Knockout punches and tooling available
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
Murata Power Solutions’ new DMR20-1-ACV self-powered, AC line-voltage monitors are
designed to measure and display the true-rms voltage of AC power systems. Simply con-
nect any 85 to 264Vac 50/60Hz power source and these meters are fully operational—no
additional components or power sources are required. The unit can also measure distorted
AC power sources including triangle, square, and the quasi-sine output of many DC to AC
power inverters.
Supplied with EPDM rubber gasket and plastic hex nut
UL/CSA approvals pending
Performance/Functional Specifications
The DMR20-1-ACV is housed in a rugged, round polycarbonate case that provides excellent
protection against moisture, dust, shock and vibration. Panel installation is straightforward:
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, and securely fasten the meter using the sup-
plied hex nut. The supplied hardware is designed to provide protection to IP67/NEMA 6.
Typical at Ta = +25°C, fin = 60Hz
AC Input (TB1)
Voltage Range ➀
Current Consumption
85 to 264Vac (47-63 Hz)
@Vin = 250Vac: 30mA (max.)
@Vin = 120Vac: 15mA (max.)
Their large, 0.30"/7.6mm, bright LED displays can be easily read from 10 feet away (3
meters). These meters accurately display ac voltages with 0.1V resolution. A built-in reset-
table fuse assures long term reliability. All DMR20-1-ACVs 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.
Performance
Sampling Rate
2.5 readings/second
0.1Vdc
.1V (typ.), .2V (max.)
(–25 to +60°C) 0.05V/°C (max.)
Resolution
Accuracy @ +25°C
Temperature Drift
Mechanical
Dimensions
1.50"diameter x 1.15 depth"
(38.1 x 29.2mm)
Four digit, LED, 0.30" high (7.6mm)
0.8 ounce (23 grams)
Polycarbonate
Display Type
Weight
Case Material
Terminal Block Torque
Wire Size And Type
Ordering Information
DMR20-1-ACV-R-C 85 to 264Vac voltage monitor (Red LED)
3.6 in-lbs (0.4 N-m)
18-22AWG (0.83-0.33mm2) copper,
solid or stranded
Knockout Punches
DMR20-1-KP
DMR20-2-KP
DMR20-3-KP
1.2" (30.5mm) Round knockout punch
(no keying notch)
1.2" (30.5mm) Round knockout punch
(with four keying notches)
1/8" and 3/16" (3.2 and 4.7mm)
key-notch nibbler tool
Wire Insulation Strip Length
0.25" (6.4mm)
Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
–25 to +60°C
–40 to +75°C
0 to 85%
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.
For full details go to
www.murata-ps.com/rohs
(pending)
(pending)
www.murata-ps.com/support
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