DMS-20PC-2-LM www.murata-ps.com Self-Powered LED Display High-Voltage, 50/60/400Hz AC Line Monitor C FEATURES Self-powered, two-terminal operation Dual operating ranges: 240-310Vac at 50/60Hz or 85-140Vac at 400Hz Half-wave averaging, rms calibrated Large, easy-to-read, bright red LED display Rugged, epoxy-encapsulated construction Built-in bezel for panel mounting Reliable screw terminals for easy installation Small 1.38" x 0.88" x 1.0" package Approvals to UL/cUL/IEC/61010-1 Functional Specifications Input Voltage Range ➀ Current Consumption 240-310Vrms (47-99Hz) 85-140Vrms (350-450Hz) 50mArms (max.) UL/IEC61010-1 Measurement category II Performance Sampling Rate Measurement Type 2.5 readings/second Half-wave average, rms calibrated for sinusoidal input ±1V (typ.), ±2V (max.) Accuracy @ +25°C Temperature Drift (–25 to +60°C) ±0.15 Volts/°C (max.) Mechanical Dimensions Display Type Weight Case Material 6-32 screw torque Environmental Operating Temperature Storage Temperature Humidity (Non-condensing) 1.38” x 0.88” x 1.00” 3 digit, red LED, 0.37”/9.4mm 1 ounce (28 grams) Polycarbonate 6-8 in-lb (0.7 – 0.9N-m) ® US E156931 DATEL’s DMS-20PC-2-LM is a component-size, self-contained, low-cost ac voltmeter specifically designed for high-voltage or high-frequency operation. The DMS-20PC-2-LM’s unique power-supply circuitry allows a single model to operate from either 240 to 310Vac with 50/60Hz inputs or from 85 to 140Vac with 400Hz inputs. The meter requires no external components or auxiliary power for full operation! Its large, 0.37"/9.4mm, bright red LED display is easily readable under virtually all lighting conditions. DMS-20PC-2-LM employs half-wave sinusoidal averaging (rms calibrated) to achieve a display resolution of 1Vac over its full operating range. Packaged in a red-filter case with a built-in bezel, the meter is epoxy encapsulated for ruggedness. This low-cost, extremely versatile digital voltmeter is ideal for use in emergency power equipment, 277Vac fluorescent lighting systems, 400Hz aircraft installations, and any other application requiring accurate, high-voltage or high-frequency, ac line monitoring. Typical panel mount installation Suggested wiring (user supplied) Ordering Information DMS-20PC-2-LM-C DMS-BZL3-C DMS-BZL4-C DMS-20-CP High-voltage ac line monitor with screw terminals and screws Panel mount bezel Panel mount bezel with sealing gasket Panel cutout punch Brass screws (6-32 thread) and a panel-mount retaining clip are supplied with each meter –25 to +60°C –40 to +75°C 0 to 95% ➀ Operation and accuracy at inputs above or below this range are not specified. CURRENT LIMITED AC SUPPLY For full details go to www.murata-ps.com/rohs Typical Connection Diagram www.murata-ps.com/support MPM_DMS-20PC-2LM.B06 Page 1 of 2 DMS-20PC-2-LM Self-Powered LED Display High-Voltage, 50/60/400Hz AC Line Monitor Power Supply Polarity, Fusing, Wiring, and Grounding: DMS-20PC-2-LM’s two ac-supply terminals are not polarity sensitive, that is, they have no “AC LO” or “AC HI” designations. These units do not include nor require a connection to earth/chassis ground. nal circuitry; they must not be used to supply power to external loads. Depending on the ac supply line-voltage in the user’s installation, the supply wires feeding these voltmeters must be fused with a 0.25A/250V or a 0.25A/600V time delay/time lag fuse, in accordance with applicable regulatory codes. All ac-supply wiring must be rated for the voltages and currents they will conduct and comply with any code or application-mandated requirements pertaining to the user’s specific installation. 300V UL rated wire suitable for the intended application is required. The recommended wire size is 16AWG to 20AWG (1.31mm2 to 0.52mm2) stranded copper wire. Wires must be properly stripped and attached to the threaded standoffs such that their insulation is not pinched by the supplied 6-32 screws. Rated tightening torque for the 6-32 screws is 7 to 8 poundinches (0.8 to 0.9N-m). DMS-20PC-2-LM ac voltmeters are not internally fused. The rear threaded standoff input-terminals are to be used only for powering the voltmeter’s inter1. Description of safety marks: Caution, risk of electrical shock Caution, risk of danger Equipment is protected throughout by double or reinforced insulation 2. Cleaning Instructions: Gently clean with dry cloth only. 3. Caution: if the equipment is used in a manner not specified by Murata Power Solutions, the protection provided by the equipment may be impaired. 1.30 (33.0) DMS-20PC-2-LM ® ® 0.04 (1.016) 0.04 (1.016) #6-32 UNC THD 0.44 (11.2) 0.80 (20.3) 0.88 (22.4) 0.32 (8.1) 0.75 (19.1) 1.38 (35.1) 0.37 (9.4) 1.00 (25.4) #2-56 INSERT 0.156 (3.96) DEEP 1.07 (27.2) DMS-BZL3-C Optional Bezel 0.10 (2.5) 1.63 (41.4) Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 0.04 (1.016) 0.19 (4.8) 1.28 (32.5) Dimensions in inches (millimeters) Tolerances: 2 PL Dec ±0.02 (±0.51) 3 PL Dec ±0.010 (±0.254) Recommended panel cutout dimensions: 1.336 (33.93)W × 0.838 (21.29)H Internal corner radii 0.032 (0.81) Max. 0.10 (2.5) 1.83 (46.5) 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. © 2014 Murata Power Solutions, Inc. www.murata-ps.com/support MPM_DMS-20PC-2LM.B06 Page 2 of 2