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Technical content
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-fi lm 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. ➀ Operation and accuracy at inputs above or below these ranges are not specifi ed. 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 fl ash on and completely off at approximately one second intervals. Continuous operation above 80V will permanently damage the meter and void its warranty. Performance/Functional Specifi cations 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 2.5 readings/second Resolution 0.01Vdc in LO Range; 0.1Vdc in HI Range Accuracy @ +25°C HI Range ➁ ±0.2V (typ.), ±0.4V (max.) LO Range ➁ ±0.03V (typ.), ±0.06V (max.) Overrange Indication ➂ See note 3 Temperature Drift ±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) with nut and gasket Case Material 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%
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 (no keying notch) DMR20-2-KP 1.2" (30.5mm) Round knockout punch (with four keying notches) DMR20-3-KP 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” suffi x denotes RoHS compliance. www.murata-ps.com www.murata-ps.com/support For full details go to www.murata-ps.com/rohs Ḥ DMR20-10-DCM 2-Wire, Self-Powered, Auto-Ranging DC Voltage Monitor MPM_DMR20-10-DCM.A01 Page 1 of 4 NANO
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 simplifi es 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
any doubt regarding installation or operation.
- Operating Input Range: The unit is shipped with auto-range jumper
JP1 confi guration changes made with power applied to TB1. +51V, the displayed resolution is 0.01V (i.e., the unit is in LO Range). Range and display 0.01V resolution. “Performance/Functional Specifi cations” section for more information.
- Calibration: DMR20-10-DCM voltmeters are factory calibrated; there
are no provisions for calibrating these meters in the fi eld.
- Panel Installation: All electrical connections to DMR20-10-DCM must
wiring. See Figure 2 for typical panel mounting details. approximately 17 in-lbs (1.9 N-m). against environmental effects. resistance to vibration, and dust and moisture ingress.
- Input Fusing and Wiring : DMR20-10-DCM voltmeters contain an
dance with applicable regulatory codes. used to supply power to external loads.
- Input Polarity: The input terminal block TB1 is polarity sensitive, and
Figure 1. JP1 confi gured for auto-range operation
Dimensions are in inches (mm). Components are shown for reference only. Figure 2. Panel Installation
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. Specifi cations are subject to change without notice. © 2013 Murata Power Solutions, Inc. www.murata-ps.com/support Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED DMR20-10-DCM 2-Wire, Self-Powered, Auto-Ranging DC Voltage Monitor MPM_DMR20-10-DCM.A01 Page 4 of 4 NANO