DMS-20PC-2-LM-C - MURATA MANUFACTURING

Functional Speciﬁ cations

Input

Voltage Range ➀ 240-310Vrms (47-99Hz)

85-140Vrms (350-450Hz)

Current Consumption 50mArms (max.)

UL/IEC61010-1 Measurement category II

Performance

Sampling Rate 2.5 readings/second

Measurement Type Half-wave average, rms

calibrated for sinusoidal input

Accuracy @ +25°C ±1V (typ.), ±2V (max.)

Temperature Drift

(–25 to +60°C) ±0.15 Volts/°C (max.)

Mechanical

Dimensions 1.38” x 0.88” x 1.00”

Display Type 3 digit, red LED, 0.37”/9.4mm

Weight 1 ounce (28 grams)

Case Material Polycarbonate

6-32 screw torque 6-8 in-lb (0.7 – 0.9N-m)

Environmental

Operating Temperature –25 to +60°C

Storage Temperature –40 to +75°C

Humidity (Non-condensing) 0 to 95%

➀ Operation and accuracy at inputs above or below this range are

not speciﬁ ed.

DMS-20PC-2-LM-C High-voltage ac line monitor with screw terminals and screws

DMS-BZL3-C Panel mount bezel

DMS-BZL4-C Panel mount bezel with sealing gasket

DMS-20-CP Panel cutout punch

Brass screws (6-32 thread) and a panel-mount retaining clip are supplied with each meter

Typical panel mount installation

Suggested wiring (user supplied)

Ordering Information

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

DMS-20PC-2-LM

Self-Powered LED Display High-Voltage,

50/60/400Hz AC Line Monitor

MPM_DMS-20PC-2LM.C01 Page 1 of 2

Murata Power Solutions’ DMS-20PC-2-LM is a component-size, self-contained, low-

cost ac voltmeter speciﬁ cally 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-ﬁ lter case with a built-in bezel,

the meter is epoxy encapsulated for ruggedness.

This low-cost, extremely versatile digital volt-

meter is ideal for use in emergency power equip-

ment, 277Vac ﬂ uorescent lighting systems, 400Hz

aircraft installations, and any other application

requiring accurate, high-voltage or high-frequency,

ac line monitoring.

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

CURRENT

LIMITED

AC SUPPLY

Typical Connection Diagram

C®US E156931

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.

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 speciﬁ c installation. 300V UL rated wire suitable for the

intended application is required.

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 inter-

nal circuitry; they must not be used to supply power to external loads. Depend-

ing 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.

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 pound-

inches (0.8 to 0.9N-m).

1. 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 speciﬁ ed by Murata Power Solutions, the protection provided by the equipment may be impaired.

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.

DMS-20PC-2-LM

0.75

(19.1)

#6-32

UNC THD

0.44

(11.2) 0.80

(20.3)

0.32

(8.1)

0.04

(1.016)

0.88

(22.4)

1.00

(25.4)

0.04

(1.016)

0.04

(1.016)

1.30

(33.0)

1.38

(35.1)

0.19

(4.8)

1.28

(32.5)

0.10

(2.5)

1.07

(27.2)

0.10

(2.5)

#2-56 INSERT

0.156 (3.96) DEEP

1.63 (41.4)

1.83 (46.5)

0.37

(9.4)

DMS-BZL3-C

Optional Bezel

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. Speciﬁ cations are subject to change without

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁ eld, 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/

DMS-20PC-2-LM

Self-Powered LED Display High-Voltage,

50/60/400Hz AC Line Monitor

MPM_DMS-20PC-2LM.C01 Page 2 of 2