DMS-20PC-0/5-24RL-C - MURATA MANUFACTURING

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DMS-20PC-0/5 Series

0-5V and 0-10V Input 3½ Digit, LED

Display Process Control Monitors

MPM_DMS20pc_5V.C01 Page 1 of 4

Murata Power Solutions’ DMS-20PC-0/5 Series are the world's smallest, full-featured,

0-5V input process control monitors. Their large, easy-to-read, 0.37"/9.4mm LED displays

are available in a choice of 4 LED color/intensity options: standard red, standard green,

super-bright red, and low-power red. Two power supply input ranges are also available:

the industry-standard +5V and a wide-range +5V to +40V (which typically draws 9mA at

+24V).

Gain (span) and offset (zero) adjustments are performed with on-board, precision,

20-turn potentiometers. All decimal-point and range-change selections are made on an

8-position, vibration-resistant, gold-plated DIP switch. Unlike competitive meters, there

are no jumpers or solder gaps to open or close, and to further enhance reliability, the

entire assembly utilizes 100% soldered connections. Both power-supply and input-signal

connections are made via reliable screw-type terminal blocks.

The DMS-20PC-0/5's DIP switch and potentiometers accommodate hundreds of input-

voltage/output-reading combinations. This practically eliminates the need for more costly,

long-lead-time, factory "specials" in applications which use several different-range meters.

A supplied bezel assembly––featuring metal fasteners and a rubber gasket––simpliﬁ es

panel mounting and also provides excellent resistance to environmental dust and moisture.

All these outstanding features combine to make the DMS-20PC-0/5 the perfect meter for

prototype and OEM, 0-5V input, process control monitoring.

FEATURES

 Accepts 0-5V and 0-10V inputs

 Large, easy-to-read, 0.37"/9.4mm LED display

 Choice of 5 LED power/color options

 High input impedance, 100kΩ

 +5V to +40V model draws 9mA typ.

 Miniature size: 1.38" x 1.25" x 0.95"

 High-quality, 20-turn, span (gain) and zero (offset)

adjustments

 DIP-switch selectable range and decimal points

 Vibration-resistant package; Reliable screw-terminal

input connections

 Hundreds of different input/readout combinations

DP3DP2DP1

TB2

–

Signal Input

TB1

–V

–

Zero

Adjust

R3 R7

Gain

Adjust

Band-Gap

Reference

Circuit

HI LO

+5V –5V

3½ Digit

–5V +5V

A/D Converter

+5V

DC/DC

DIP Switches

Converter

Power Supply Input

DATA

–5V

N.C.

12346587

21 21

SIMPLIFIED SCHEMATIC DIAGRAM

Figure 1. DMS-20PC-0/5 simpliﬁ ed schematic

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DMS-20PC-0/5 Series

0-5V and 0-10V Input 3½ Digit, LED

Display Process Control Monitors

MPM_DMS20pc_5V.C01 Page 2 of 4

OPERATING AND SETUP INSTRUCTIONS

TECHNICAL NOTES

DMS-20PC-0/5-5RS-C +5V supply, standard-intensity red LED's

DMS-20PC-0/5-5GS-C +5V supply, standard-intensity green LED's

DMS-20PC-0/5-5BS-C +5V supply, bright blue LED's

DMS-20PC-0/5-5RL-C +5V supply, low-power red LED's

DMS-20PC-0/5-5RH-C +5V supply, high-intensity red LED's

DMS-20PC-0/5-24RL-C +5V to +40V supply, low-power red LED's

DMS-20-CP Panel cutout punch

As shipped, the DMS-20PC-0/5 is factory calibrated to read "000" for

a 0.0V input and "1999" for a 5.0V input. The following worst-case

procedure assumes the DMS-20PC-0/5 is completely mis-adjusted, i.e.,

both potentiometers and the DIP switches are randomly set.

1. Set R7 (full scale span/gain adjust) and R3 (zero/offset adjust) fully

clockwise, roughly 22 turns, and place SW1-SW8 to OFF (down

position).

2. Select DIP switch setting #1 in Table 1.

3. Apply a precision 0.0V input and adjust R3 until the meter's display

reads "000.”

4. Apply a precision 5.0V input and adjust R7 until the meter's display

reads "1999.” Repeat steps 3 and 4 to make sure the adjustments

do not affect one another.

5. Select the appropriate decimal point by setting SW6, SW7 or SW8 to

ON (DP1, DP2 or DP3 respectively).

NOTE: The "000" to "1999" display readings referred to in the

instructions above are for illustrative purposes only. If other display

readings such as "000" to "1200" are desired, refer to the DIP-

Switch Settings Tables for SW1-SW4 settings. (SW5 is reserved for

future use, it has no affect on display operation.) The initial setting

of R3 and R7 fully clockwise is recommended in the adjustment

procedure for all the following examples.

➀ The DMS-20PC-0/5 can also be used in most 0-10V applications. See the section

on 0-10V inputs for more information. See Note 3 on Table 1.

➁ INPUT LO (TB1 "–LO") is internally connected to the power return (TB2 "–V").

Overvoltage speciﬁ cations apply to the INPUT HI (TB1 "+HI") connection.

1. Input Conﬁ guration: The DMS-20PC-0/5 has its input low terminal

(TB1 "LO") internally connected to the power supply ground terminal

(TB2 "–V"). This connection effectively places the meter's input in a

single-ended conﬁ guration. In some applications, single-ended inputs

can cause ground-loop induced errors (the meter's display becomes

unstable or bounces). This occurs because the LED drive currents

ﬂ ow through both the –V terminal and the signal LO terminal.

If suspected ground-loop errors are encountered, and the input signal

LO terminal is externally connected to –V somewhere else in the

system, try removing the connection to TB1 "LO.” Inputs which have

no ground-return connection to –V (commonly referred to as "ﬂ oating

inputs") must have their most negative potential tied to TB1 "LO."

Please consult Murata Power Solutions for more information.

Applications which require electrical isolation between the input

signal source and the system power supply must use a separate

transformer-isolated supply to power the meter.

2. Panel Mounting: In most standard through-the-panel installations,

the DMS-20PC-0/5 must be secured to the panel with DMS-BZL4

bezel assemblies (see the Mechanical Speciﬁ cations section for more

information).

Performance/Functional Speciﬁ cations

Typical at TA = +25°C, unless otherwise noted.

Inputs Min. Typ. Max. Units

Full Scale Input Range ➀ 4.9 5.0 5.1 Volts

Input Impedence 100 – 140 kΩ

Overvoltage Protection ➁ – – ±40 Volts

Performance

Sampling Rate 2.5 reading per second

Accuracy (1 minute warm-up): ±0.05%FS ±1 Count

Temperature Drift (0 to +60°C) – ±0.15 ±0.3 Cnts/°C

Power Supply Requirements

DMS-20PC-0/5-5RS (90mA max.) +4.75 +5.00 +5.25 Volts

DMS-20PC-0/5-5GS, -5BS (120mA max.) +4.75 +5.00 +5.25 Volts

DMS-20PC-0/5-5RL 15mA max.) +4.75 +5.00 +5.25 Volts

DMS-20PC-0/5-5RH (90mA max.) +4.75 +5.00 +5.25 Volts

DMS-20PC-0/5-24RL (15mA max.) +4.75 – +40.0 Volts

Display

Display Type and Size 3½ digit, 0.37"/9.4mm high LED

Polarity Indication "–" for negative VIN

Overrange Indication "–1_ _ _" for negative inputs

"1_ _ _" for positive inputs

Physical/Environmental

Operating Temperature 0 – +60 °C

Storage Temperature –20 – +75 °C

Humidity (non-condensing) 0 – 95 %

Case Material Polycarbonate

Weight 0.6 ounces (17 grams)

Ordering Information

Note: A DMS-BZL4 bezel assembly with a sealing gasket is supplied with each meter.

See www.murata-ps.com/dpm-availability for model-speciﬁ c availability.

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DMS-20PC-0/5 Series

0-5V and 0-10V Input 3½ Digit, LED

Display Process Control Monitors

MPM_DMS20pc_5V.C01 Page 3 of 4

Display Reading SW1 SW2 SW3 SW4

0.0V Input 5.0V Input

1. 000 1200-1999 Off Off Off Off

2. 000 700-1200 On Off Off Off

3. 000 400-700 Off On Off Off

4. 000 300-400 Off Off On Off

5. 000 190-300 Off On On Off

6. 000 120-190 Off Off On On

7. 000 100-150 Off On On On

8. 000 90-140 On On On On

Table 1. 0-5V DIP-Switch Settings ➂

➂ The DMS-20PC-0/5 is optimized for handling 5V signal ranges that are

positioned between –0.1V and +6.0V. As such, input ranges can be anywhere

between –0.1V to +4.9V and +1.0V to +6.0V as long as their full range is

5 Volts. The meter's zero/offset potentiometer (R3) has enough adjustment

range to produce a "000" display reading for input signal levels between

–0.1V and +1.0V.

Please note the DMS-20PC digital panel meter from which the DMS-20PC-0/5

is derived has an accuracy speciﬁ cation of ±2 counts (max.). Thus, it may not

always be possible to obtain the exact desired display readings.

1. Desired display readings are:

0.0V input = "0.00"

5.0V input = "6.00"

Use DIP-switch setting #3 in Table 1 and enable decimal point DP2

via SW7. Apply 0.0V and adjust R3 so the display reads "0.00.”

Apply 5.0V and adjust R7 so the display reads "6.00.”

2. Desired display readings are:

0.0V input = "000"

5.0V input = "800"

Use DIP-switch setting #2 in Table 1. Apply 0.0V and adjust R3 so

the display reads "000.” Apply 5.0V and adjust R7 so the display

reads "800.” For these display readings, no decimal points are

used. Set SW6, SW7 and SW8 to OFF.

3. Desired display readings are:

0.0V input = .”000"

5.0V input = .”250"

Use DIP-switch setting #5 in Table 1 and enable decimal point DP1

via SW6. Apply 0.0V and adjust R3 so the display reads "000.” Apply

5.0V and adjust R7 so the display reads .”250.”

Examples (0-5V Inputs)

While the DMS-20PC-0/5 is optimized for operation with 0-5V inputs,

its versatile input stage can also accommodate most 0-10V applica-

tions. The meter's zero/offset potentiometer (R3) has enough adjust-

ment range to produce a "000" display reading with input signal levels

between –0.1V and +1.0V. Table 2. summarizes the available ranges

when the DMS-20PC-0/5 is used with 0-10V inputs.

0-10V Inputs

1. Desired display readings are:

0.0V input = "000"

10.0V input = "500"

Use DIP switch setting #4 in Table 2. Apply 0.0V and adjust R3 so

the display reads "000.” Apply 10.0V and adjust R7 so the display

reads "500.”

Display Reading SW1 SW2 SW3 SW4

0.0V Input 10.0V Input

1. 000 1400-1999 On Off Off Off

2. 000 800-1400 Off On Off Off

3. 000 600-800 Off Off On Off

4. 000 380-600 Off On On Off

5. 000 240-380 Off Off On On

6. 000 200-300 Off On On On

7. 000 180-280 On On On On

Table 2. 0-10V DIP-Switch Settings

Example (0-10V Inputs)

4. Desired display readings are:

1.0V input = "000"

6.0V input = "090"

Even though this input is positioned between +1.0V and +6.0V,

it still meets the 5V full scale input range listed in the Functional

Speciﬁ cations section. Use DIP-switch setting #8 in Table 1. Apply

1.0V and adjust R3 so the display reads "000.” Apply 6.0V and adjust

R7 so the display reads "090.” With this type of input, it is advisable

to recheck both input levels to be sure the potentiometer settings do

not affect one another.

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45768

123

46578

2345678

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6578

132

45678

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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-0/5 Series

0-5V and 0-10V Input 3½ Digit, LED

Display Process Control Monitors

MPM_DMS20pc_5V.C01 Page 4 of 4

TOLERANCES: 2 PL DEC ±0.02 (±0.51)

3 PL DEC ±0.010 (±0.254)

WIRE SIZE: 18 to 26 AWG (Solid or stranded)

STRIPPING LENGTH: 0.20" (5.08mm)

DP2

(SW7)

DP3

(SW8)

DP1

(SW6)

Front View

0.80

(20.3)

0.040

(1.02)

1.30

(33.0)

1.38

(35.1)

0.88

(22.4)

0.95

(24.1)

MADE IN USA

DMS-20PC-0/5

1.25

(31.8)

0.040

(1.02)

0.040

(1.02)

0.44

(11.2)

TYP.

12 1

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+– +–

+–

Back View

DIP

Switches

Zero/Offset

Adjust

Gain/Span

Adjust TB1

Signal

Input

TB2

Power

Input

#2-56 INSERT

0.156 (3.96) DEEP

FRONT VIEW 1.280

(32.51)

0.187

(4.75)

1.826 (46.38)

0.838

(21.29)

1.626 (41.30)

1.07

(27.18)

INTERNAL CORNER RADII:

0.032 (0.81) MAX.

0.093 (2.362) DIA

(4 REQUIRED)

0.116 (2.95)

1.336 (33.93) 0.145 (3.68)

PANEL CUTOUT

BEZEL INSTALLATION

BEZEL

PANEL

GASKET

MECHANICAL SPECIFICATIONS

BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT