www.murata-ps.com
DMS-20PC-9-DCM
380V, Self-Powered, LED-Display
DC Voltage Monitor
FEATURES
Self-powered, requires only two connections
to 430Vdc measurement range
160
for 380V DC power distribution systems
Ideal
Digital replacement for analog panel meters
Large, easy-to-read, bright red LED display
Screw-style terminal connections simplify installation
Rugged silicone-encapsulated plastic package
Reverse polarity protected to –430Vdc
DATEL's DMS-20PC-9-DCM self-powered, high voltage DC monitors are specifically
designed to measure and display voltages in 380V DC power-distribution systems or battery
banks. Simply connect any 160 to 430Vdc source across its rear terminals and the meters
are fully operational—no additional components or power supplies are required.
Their large, 0.37"/9.4mm, red LED display can be easily
read from 15 feet away (5 meters). These meters accurately
display dc bus voltages with 1Vdc resolution. Built-in reverse
polarity protection assures simple, trouble-free installation.
All DMS-20PC-9-DCMs employ a 3½ digit A/D converter
and precision metal-film resistors to achieve outstanding
performance over an operating temperature range of –25 to
+60°C.
The meter’s electronics are housed in an encapsulated,
polycarbonate case that also provides excellent protection
against moisture, shock, and vibration. The DMS-20PC-9-DCM is
designed to fit in the same panel cutout as many of DATEL's
AC and DC voltage monitors and AC and DC ammeters; all of
your voltage and current monitoring instrumentation can now
be sourced from one supplier.
Typical panel mount installation and
suggested wiring (user supplied)
Functional Specifications
Input
Voltage Range
➀
Current Consumption
@Vin = 430Vdc
Reverse Polarity Protection
Performance
Sampling Rate
Resolution
Accuracy @ +25°C
Temperature Drift
(–25 to +60°C)
Mechanical
Dimensions
Display Type
Weight
Case Material
6-32 screw torque
Environmental
Operating Temperature
Storage Temperature
Humidity (Non-condensing)
+160 to +430Vdc
3mA (max.)
-430Vdc (max.)
2.5 readings/second
1Vdc
±1V (typ.), ±2V (max.)
±0.4 V/°C (max.)
1.38" x 0.88" x 1.00"
3 digit, red LED, 0.37"/9.4mm
1 ounce (28 grams)
Polycarbonate
6-8 in-lbs (0.7 – 0.9N-m)
–25 to +60°C
–40 to +75°C
0 to 85%
Ordering Information
DMS-20PC-9-DCM-C
DMS-BZL4-C
DMS-20-CP
160 to 430V DC voltage monitor (Red LED)
Optional panel mount bezel with sealing gasket
Panel cutout punch
➀
Operation and accuracy at inputs above or below this range
are not specified.
Note: Brass screws (6-32 thread) and a panel-mount retaining clip are supplied with each meter. The ‘-C’ suffix
denotes RoHS compliance.
TECHNICAL NOTES
!
IMPORTANT!
To ensure safe and reliable operation, DMS-20PC-9-DCM high voltage moni-
tors must be installed and serviced by qualified technical personnel. Contact Murata
Power Solutions if there is any doubt regarding installation or operation.
1. Measurement Type:
DMS-20PC-9-DCM AC voltmeters employ a precision analog-to-
digital converter and a stable voltage reference to measure and display voltages from
+160Vdc to +430Vdc.
2. Calibration:
DMS-20PC-9-DCM voltmeters are factory calibrated; there is no provision
for calibrating units in the field.
3. Panel Installation:
All electrical connections to DMS-20PC-9-DCM must be made after
the voltmeter is securely attached to the panel, and with the input DC supply de-ener-
gized (off). In high-vibration environments, adequate strain reliefs must be used on all
supply wiring. While the supplied brass retaining clip is adequate for most installations,
the DMS-BZL4-C optional bezel assembly is recommended for demanding environmen-
tal installations. (Continued on next page.)
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MPM_DMS-20PC-9-DCM.A01
Page 1 of 2
DMS-20PC-9-DCM
380V, Self-Powered, LED-Display
DC Voltage Monitor
TECHNICAL NOTES, CONT.
4. Power Supply Fusing and Wiring:
DMS-20PC-9-DCM DC voltmeters are not internally fused. The supply wires
connected to its input terminals must be fused with a 0.25A/600V time
delay/time lag fuse, in accordance with applicable regulatory codes.
All 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. 600V, UL-rated hook-up wire
suitable for the intended application is required. The rear threaded standoff
input-terminals are to be used only for powering the meter’s internal
circuitry; they must not be used to supply power to external loads.
The recommended supply wire size is 18AWG to 22AWG (0.83mm
2
to
0.325mm
2
) solid or stranded copper wire. The supply wires must be
properly stripped and attached to the meter’s rear terminals such that their
insulation is not pinched by the screw terminal. Recommended insulation
strip length is 0.60" (15.2mm).
MECHANICAL SPECIFICATIONS
1.30
(33.0)
+
0.04
(1.016)
0.04
(1.016)
0.04
(1.016)
®
–
®
#6-32
UNC THD
0.44
(11.2)
0.80
(20.3)
0.88
(22.4)
0.37
(9.4)
0.75
(19.1)
0.32
(8.1)
1.00
(25.4)
#2-56 INSERT
0.156 (3.96) DEEP
0.19
(4.8)
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.
1.07
(27.2)
DMS-BZL4-C
Optional Bezel
1.28
(32.5)
0.10
(2.5)
1.63 (41.4)
1.83 (46.5)
0.10
(2.5)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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.
© 2013 Murata Power Solutions, Inc.
www.murata-ps.com/support
MPM_DMS-20PC-9-DCM.A01
Page 2 of 2
DMS-20PC-9-DCM
1.38
(35.1)
+
–
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