DMR20-10-DCM_V01 MURATA-PS | Alldatasheet
Document overview
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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 operational—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 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 into the panel, and securely fasten the meter using the supplied hex nut. The supplied hardware is designed to provide protection to IP67/NEMA 6. ➀ Operation and accuracy at inputs above or below these ranges are not specified. ➀ When auto-range operation is enabled via jumper JP1 and Vin is between 6V to 51V, the displayed resolu- 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. ➀ 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. 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 2.5 readings/second Resolution 0.01Vdc in LO Range; 0.1Vdc in HI Range Accuracy @ +25°C HI Range ➀ ±0.2V (typ.), ±0.4V (max.) LO Range ➀ ±0.03V (typ.), ±0.06V (max.) Overrange Indication ➀ 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 2.2 lb·in (0.25 N·m) ±20% 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” suffix denotes RoHS compliance. MPS Part Number Product Status DMR20-1-KP Discontinued DMR20-2-KP Discontinued DMR20-3-KP Discontinued NOTE: See the table on the back page for recommended substitutes. To Be Discontinued www.murata-ps.com www.murata-ps.com/support For full details go to www.murata-ps.com/rohs DMR20-10-DCM 2-Wire, Self-Powered, Auto-Ranging DC Voltage Monitor MPM_DMR20-10-DCM.B02 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 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
any doubt regarding installation or operation.
- Operating Input Range: The unit is shipped with auto-range jumper JP1 in
it will auto-range back to the LO Range and display 0.01V resolution. Specifications” section for more information.
- Calibration: DMR20-10-DCM voltmeters are factory calibrated; there are no
provisions for calibrating these meters in the field.
- Panel Installation: All electrical connections to DMR20-10-DCM must be
clockwise will produce approximately 17 in-lbs (1.9 N-m). integrity and its ability to protect against environmental effects. dations results in optimal resistance to vibration, and dust and moisture ingress. materials except for stainless steel or other hardened metals. environmental conditions expected in the end application.
- Input Fusing and Wiring: DMR20-10-DCM voltmeters contain an internal,
internal circuitry; it must not be used to supply power to external loads. potentially cause a short circuit across the DC supply input.
- Input Polarity: The input terminal block TB1 is polarity sensitive, and con-
polarity voltages up to –100V will not damage the meter. Figure 1. JP1 configured for auto-range operation
Dimensions are in inches (mm). Components are shown for reference only. Figure 2. Panel Installation
MPS Part Number Description Recommended Replacement Part Manufacturer Part Number DMR20-1-KP Round knockout punch (no keying notch) Greenlee 36508 DMR20-2-KP Round knockout punch (4 keying notches N/A DMR20-3-KP Key notch nibbler toll Greenlee 720 www.murata-ps.com/support 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. © 2023 Murata Power Solutions, Inc. 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/ DMR20-10-DCM 2-Wire, Self-Powered, Auto-Ranging DC Voltage Monitor MPM_DMR20-10-DCM.B02 Page 4 of 4 NANO