Datasheet DMS-40PC-4-20S-24RL, DMS-40PC-4-20S-24RH-I, DMS-40PC-4-20S-24GS-I, DMS-40PC-4-20S-5RS, DMS-40PC-4-20S-5RL Datasheet (DATEL)

® ®

DMS-40PC-4/20S

4-20mA Input

4½ Digit Process Monitors

with Full-Size LED Displays

Order on-line at www.datel.com

Features

• Full-size, 0.52" (13.2mm) high, LED digits

• +7.5-32Vdc model draws 30mA

• +24V Isolated-power models

• Dip-switch selectable range, offset, and

decimal points

• Non-interacting, 20-turn, gain (span) and

offset (zero) adjustments

• Insensitive to ground loops

• 103 Ohm max. loop burden

• Vibration-resistant package; reliable screw-

terminal connections

• Hundreds of different input/readout

combinations

• Miniature size: 2.17" x 0.92" x 1.02"

(55mm x 23mm x 26mm)

New +24V Isolated-Power Models

The DMS-40PC-4/20S Series' superior design makes them ideal for use in
demanding 4-20mA process monitoring applications requiring a full 4½ digits (0-19999)
of display resolution. Their full-size, 0.52" (13.2mm) high, LED displays can be read in
virtually any lighting condition and are available in green, high-intensity red, or low­power red.

Two operating power supply ranges are available: a wide-input +7.5 to 32V model
for use with popular +12Vdc and +24Vdc industrial supplies, and +4.75 to 5.25V
models for use with +5V logic supplies. The reverse-polarity protected +7.5-32V red
LED model consumes only 30mA from a +24V supply, but still provides excellent
display brightness.

The DMS-40PC-4/20's input, span, and offset circuits all employ super-stable,
±0.5% thin-film chip resistors. Long-term stability and accuracy are assured by driving
these tight-tolerance resistors with an ultra-stable, ±0.2% bandgap voltage reference.
And, unlike many competing designs, the two precision 20-turn span and zero adjust
potentiometers do not interact with one another.

All range-change and decimal point selections are made by configuring two gold­plated, vibration-resistant, six-position DIP switches. To further enhance reliability, both
power supply and current loop connections are made via reliable screw-type terminal
blocks. All these outstanding features make the DMS-40PC-4/20S Series meters the
most rugged 4½ digit LED display process monitors available.

4½ DIGIT A/D
CONVERTER

Range

Offset Gain

DATA

R3 R7

ZERO

ADJUST

GAIN

ADJUST

BAND-GAP

REFERENCE

CIRCUIT

+5V

➀ -V is not connected to meter

ground on ‘-I’ suffix models.

ON

ON

S1 S2

112 3 456

1

2

3 4 5 6

SG9

CURRENT TO

VOLTAGE

CONVERTER

ON

ON

2 345 6

111

2 3 4 5 6

TB1

1

4-20mA

CURRENT LOOP POWER

2

–+

DP4

DP3DP2DP1

+5V

VOLTAGE

CONVERTER

1

TB2

2

1

+V

POWER

SUPPLY INPUT

–+

–V

Figure 1. DMS-40PC-4/20S Simplified Schematic

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E-mail: [e-mail] • Internet: www.datel.com

DMS-40PC-4/20S

4½ DIGIT, 4-20mA INPUT, LED DISPLAY METERS

Performance/Functional Specifications

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

Current Loop Input Min. Typ. Max. Units

Full Scale Input Range (1) +3.7 — +20.4 mA
Loop Impedance (2) 12 — 103 Ohms
Voltage Drop (2) — — 2.1 Volts
Overcurrent Protection — — ±40 mA

Performance

Sampling Rate 2.5 readings per second
Adjustable Accuracy (15 min. warm-up) To ±0.01% of full scale ±2 counts
Temperature Drift of Span (3) — ±0.3 ±0.6 Cnts/°C
Temperature Drift of Zero (3) — ±0.2 ±0.5 Cnts/°C

Power Supply Requirements (4)

DMS-40PC-4/20S-5RS +4.75 to +5.25Vdc at 140mA max.
DMS-40PC-4/20S-5GS +4.75 to +5.25Vdc at 140mA max.
DMS-40PC-4/20S-5RH +4.75 to +5.25Vdc at 140mA max.
DMS-40PC-4/20S-5RL +4.75 to +5.25Vdc at 50mA max.
DMS-40PC-4/20S-24RL +7.5 to +32Vdc at 50mA max.
DMS-40PC-4/20S-24XX-I Models +21.6 to +26.4Vdc at 60mA max.

Display

Display Type and Size 4½ digit LED, 0.52"/13.2mm high
Polarity Indication "-" for negative readings
Overrange Indication Flashing "0000"

Physical/Environmental

Operating Temperature 0 — +50 °C
Storage Temperature –40 — +75 °C
Humidity (Non-condensing) 0 — 95 %
Case Material Polycarbonate
Weight 1 ounce (28grams)

Order on-line at www.datel.com

Ordering Information

DMS-40PC-4/20S-5RS +5V supply, standard-intensity red LED's
DMS-40PC-4/20S-5GS +5V supply, standard-intensity green LED's
DMS-40PC-4/20S-5RL +5V supply, low-power red LED's
DMS-40PC-4/20S-5RH +5V supply, high-intensity red LED's
DMS-40PC-4/20S-24RL +7.5V to +32V supply, low-power red LED's
DMS-40PC-4/20S-24RS-I +24V isolated supply, standard-intensity

red LED’s

DMS-40PC-4/20S-24RH-I +24V isolated supply, high-intensity red LED’s
DMS-40PC-4/20S-24GS-I +24V isolated supply, standard-intensity

green LED’s

DMS-BZL1 Panel-mount bezel assembly
DMS-BZL2 Panel-mount bezel assembly with

sealing gasket

DMS-30-CP Panel cutout punch
A panel-mount retaining clip is supplied with each model.

Technical Notes

(1) Full Scale Input: The DIP Switch settings display readings in Table 1

can typically be obtained with transmitters having a low-level output of

3.7 to 4.3mA and a full-scale output of 19.4 to 20.4mA. When using
transmitters whose outputs fall outside these ranges, try using the
next highest DIP switch setting if the desired reading is too low, or the
next lowest setting if the desired display reading is too high. Example
number 2 illustrates this point.

Please keep in mind that the DMS-40PC meter from which the DMS­40PC-4/20S is derived has an accuracy specification of ±3 counts
(max.); thus, it may not always be possible to obtain the exact desired
display readings. A change of ±1 count is defined as the right-hand
most digit (the"ones" LED) going up or down by one.

Other display readings not shown in Table 1 are obtainable. For
example, some negative readings with a 4mA input are possible.
Consult DATEL for more information regarding display readings not
shown in the table.

(2) Loop Impedance/Drop: The maximum loop impedance and the

maximum loop voltage-drop are both specified with DIP switch setting
#20 enabled. The maximum loop voltage drop is specified with a

20.0mA input current.

(3) Temperature Drift: Temperature drift of zero and temperature drift of

gain are both specified with the meter configured for range #20 with
4mA adjusted (using R3) to read "0000" ±1 count, and 20mA adjusted
(using R7) to read "19000" ±2 counts.

The temperature drift of gain is proportional to the full scale range
being used. It is typically less pronounced at the lower range settings,
that is, if the observed gain drift of a particular meter is +12 counts
when reading "19000" on range #20 at 40°C, the same meter will
most likely have a drift of only +6 counts when reading "9000" on
range #12 at 40°C.

The normally very accurate autozeroing feature of the DMS-40PC-4/
20S's internal analog-to-digital converter (A/D) is not a factor in
determining the meter's zero-reading stability over temperature due to
the fact that an offset voltage is applied to the A/D's LO input. This
offset voltage is used to null the voltage developed with a 4ma input.
To function properly, the autozeroing feature found in most digital
panel meters requires both A/D inputs to remain at zero volts with
varying temperature. The meter's zero-reading stability over its
specified operating temperature is affected by the drift of three terms:
the voltage developed by the meter's offset circuitry; the voltage
developed across the meter's input resistor(s) with a 4mA input; and
the stability of the applied 4mA input signal itself. In the lower DIP
switch settings ( ranges #1-4), the meter's parasitic etch and switch
interconnect resistances also contribute a small error.

The meter's performance with regards to span stability over tempera­ture is affected by the drift of the meter's gain circuitry and the drift of
the input resistor(s). To counter these drifts in applications requiring
the utmost in temperature stability, where possible, the meter should
be calibrated at its anticipated operating temperature. For these
applications, use of the DMS-40PC-4/20S-5RL model is highly
recommended because of its inherently lower power consumption and
self-heating.

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E-mail: [e-mail] • Internet: www.datel.com

4½ DIGIT, 4-20mA INPUT, LED DISPLAY METERS

DMS-40PC-4/20S

Table 1. DIP-Switch Settings

Switch S1 Switch S2

Display Reading SW1 SW2 SW3 SW4 SW5 SW6 SW1 SW2

4mA 20mA

1. 0000 2250-2500 Off On On On Off Off On On

2. 0000 2500-2800 Off On On On Off Off Off On

3. 0000 2800-3200 Off On On On Off Off On Off

4. 0000 3200-3850 Off On On On Off Off Off Off

5. 0000 3850-4300 On Off On On Off Off On On

6. 0000 4300-4900 On Off On On Off Off Off On

7. 0000 4900-5600 On Off On On Off Off On Off

8. 0000 5600-6200 On Off On On Off Off Off Off

9. 0000 6200-6800 Off Off On On On Off On On

10. 0000 6800-7750 Off Off On On On Off Off On

11. 0000 7750-8600 On On Off On On Off On On

12. 0000 8600-9850 On On Off On On Off Off On

13. 0000 9850-11000 On On On Off Off On On On

14. 0000 11000-12000 On On On Off Off On Off On

15. 0000 12000-13000 On Off Off On Off On On On

16. 0000 13000-14000 On Off Off On Off On Off On

17. 0000 14000-15300 On Off On Off On On On On

18. 0000 15300-16300 On Off On Off On On Off On

19. 0000 16300-17800 Off Off On Off On On On On

20. 0000 17800-20000 Off Off On Off On On Off On

Since the DMS-40PC-4/20S uses extremely-stable thin-film chip
resistors, periodic re-calibration is typically required only in environ­mentally demanding applications where shock, vibration and tempera­ture extremes may have a detrimental affect on the 20-turn potentiom­eters.

(4) Input Grounding: Except for the “-I” suffix models which feature

isolated current loop inputs, all other DMS-40PC-4/20S meters are
supplied with their 4-20mA negative-input terminals (TB1-2, “-”)
internally connected to their power supply ground terminal (TB2-2,
“-V”). This single-ended input configuration is compatible with most
grounded-referenced 4-20mA transmitters.

Applications in which the DMS-40PC-4/20S and its associated 4-20mA
transmitter are connected to a common ground and the transmitter
drives two or more loads (for example, the meter is in series with a
PLC) must have the meter connected as the first device in the current
loop, that is, closest to the system ground (see Figure 2). If this
connection scheme is not possible and/or the meter must be connected
in the middle of the current loop, then‘-I’ suffix models must be used to
provide the required isolation between the meter’s current loop input
and the power supply ground (“-V”). See Figures 2, 3, 4, and 5 for
typical loop connections.

Table 2. Decimal Point Settings

Switch S2

SW3 SW4 SW5 SW6
DP1 DP2 DP3 DP4

Using the Decimal Point Settings Table as a guide, the DMS-40PC-4/
20S's decimal points can be enabled to suit the user's particular readout
requirements. Place the selected decimal point's DIP switch to the ON
position (up) to illuminate the decimal point. The decimal points are
merely placeholders, that is, they can all be illuminated or all turned off;
they have no affect on the meter's operation and/or display readings.

Operating and Setup Instructions

The following procedure must be performed as the first re-calibration step
every time DIP switches S1 and S2 are changed to select a new display
range. The following procedure also assumes the DMS-40PC-4/20S is
initially completely mis-adjusted, i.e., both potentiometers and both DIP
switches S1 and S2 are randomly set. When performing switch settings,
make sure that the DIP switch's small actuator is pushed up as far as it
will go to ensure that the switch is truly set to the ON (closed) position.

1. Set R7 (gain/span adjust) and R3 (zero/offset adjust) fully
clockwise, roughly 20 turns, then using the settings found in the
selected range, place the DIP switches on S1 and S2 to the
appropriate positions for the desired display reading.

2. Apply a precision 4mA input with proper polarity and adjust R3
(top 20-turn potentiometer) until the meter's display reads "0000".

3. Apply a precision 20mA input and adjust R7 (bottom 20-turn
potentiometer) until the display reads the maximum desired reading.
Repeat steps 2 and 3 to make sure the adjustments did not affect
one another.

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E-mail: [e-mail] • Internet: www.datel.com

DMS-40PC-4/20S

4½ DIGIT, 4-20mA INPUT, LED DISPLAY METERS

4. If necessary, select the appropriate decimal point by setting either
SW3, SW4, SW5, or SW6 of S2 to ON (DP1, DP2, DP3, or DP4,
respectively, as shown in Table 2).

NOTE: Please keep in mind that the transmitter's 4mA and 20mA output
accuracy may affect display readings which are at, or very close to, the
high and low extremes of the selected range. See Example #2 below and
Technical Note 1 for more information.

Examples

The examples below illustrate how to configure the meter to perform some
typical measurements. Remember to first set R3 and R7 to their full
clockwise position before calibrating the meter.

1. Desired display readings are:

4mA = "0.000"
20mA = "3.000"

Use DIP-switch setting #3 and enable decimal point DP2 by placing SW4
of switch S2 to ON. Apply 4mA and adjust R3 so the display reads "0.000".
Apply 20mA and adjust R7 so the display reads "3.000".

2. Desired display readings are:

4mA = "0000"
20mA = "8600"

S1 S2

ON

ON

112

1

4

3

2 3 4 5 6

5 6

S1 S2

ON

ON

112

1

4

3

2 3 4 5 6 11122

5 6

112

1

2

Use DIP-switch setting #11. Apply 4mA and adjust R3 so the display reads
"0000". Apply 20mA and adjust R7 so the display reads "8600". If the
transmitter's full-scale output is less than 20.0mA, it may not be possible
to adjust R7 for a reading of "8600" with setting #11. If this occurs, select
setting #12 and re-calibrate both R3 and R7 to obtain "0000" and "8600".
Note that for these display readings no decimal points are used. Set SW3,
SW4, SW5 and SW6 on switch S2 to OFF.

3. Desired display readings are:
4mA = "0000"

20mA = "10000"

S1 S2

ON

ON

112 3 4

1

2 3 4 5 6 11122

6

5

Use DIP-switch setting #13. Apply 4mA and adjust R3 so the display
reads "0000". Apply 20mA and adjust R7 so the display reads "10000".
For these display readings no decimal points are used. Set SW3, SW4,
SW5 and SW6 on switch S2 to OFF.

4. Desired display readings are:
4mA = ".0000"

S1 S2

ON

ON

12mA = ".2500"

112 3 4

1

2 3 4 5 6 11122

6

5

This example is not as straightforward as the previous three. Notice that
12mA is exactly halfway between 4mA and 20mA. If we assume the input
could go up to 20mA, the display reading would then be 2 x .2500 or
".5000". From the table, we can select DIP-switch setting #7 and enable
DP1 via SW3 of switch S2. Apply 4mA and adjust R3 so the display reads
".0000". Apply 12mA and adjust R7 so the display reads ".2500".

CONNECTION DIAGRAMS

+24V

+

SINGLE-ENDED

TRANSMITTER

+ +

4-20mA

–

24V GROUND

(TB1-1)

(TB1-2)

–

DMS-40PC-4/20S-24RL

Figure 2. Typical Connections for Single-Ended Transmitters Driving

Single-Ended +24V Powered Meters.

+V

(TB2-1)

–V (TB2-2)

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E-mail: [e-mail] • Internet: www.datel.com

4½ DIGIT, 4-20mA INPUT, LED DISPLAY METERS

+24V

+5V

+24V

+V

+

(TB1-1)

+

(TB2-1)

DMS-40PC-4/20S-24RL

DMS-40PC-4/20S

LOOP-POWERED

TRANSMITTER

+24V

SINGLE-ENDED

TRANSMITTER

–

4-20mA

(TB1-2)

N.C.

Figure 3. Typical Connections for Loop-Powered Transmitters

Driving Single-Ended Meters.

DMS-40PC-4/20S-24RL-I

–

–V (TB2-2)

24V GROUND

+V (TB2-1)

(TB2-2)

–V

+

(TB1-1)

+

+

4-20mA

–

(TB1-2)

4-20mA

–

+

PLC or OTHER

SINGLE-ENDED

DEVICE

–

24V GROUND

Figure 4. Typical Connections for Isolated-Supply Meters in

+

+

LOOP

TRANSMITTER

–

24V GROUND

Figure 5. Typical Connections for +5V Powered Meters. Note that 5V Ground

and 24V Ground are Tied Together Inside the Meter.

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E-mail: [e-mail] • Internet: www.datel.com

Series with an Auxiliary Device.

(TB1-1)

4-20mA

(TB1-2)

+V

(TB2-1)

+

DMS-40PC-4/20S-24RL

–

–V (TB2-2)

5V GROUND

DMS-40PC-4/20S

BEZEL INSTALLATION

4½ DIGIT, 4-20mA INPUT, LED DISPLAY METERS

Mechanical Specifications

MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC ±0.02 (±0.51)

WIRE SIZE: 18 to 26 AWG

STRIPPING LENGTH: 0.20" (5.08mm)

S1

ON

2 3 4

R3

Zero

R7

Span

R7

OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2)

FRONT VIEW

7

3 PL DEC ±0.010 (±0.254)

(Solid or stranded)

Back View

5 61

TB1

+ –

+ –

Loop
Input

2 3 4

21

+ –

Power

Input

S2

ON

5 61

TB2

+ –

21

#2-56 INSERT

0.156 (3.96) DEEP

U2

PS1

U2 U2

1

1.33

(33.8)

MADE IN USA

2.09

(53.09)

2.17

(55.12)

Depth dimension for the DMS-40PC-4/20S-24RL model only.

1

U2 is not used on 5V-powered models.

DMS-40PC-4/20S

® ®

1.02

(25.9)

0.04

(1.02)

0.84

(21.34)

0.92

(23.37)

0.040

(1.02)

Front View

SG9

DP3

S2

DP4

S2

(SW6)

0.187

(4.75)

DP1

S2

(SW3)

DP2

S2

(SW4)

(SW5)

2.55 (64.77)

RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS

INTERNAL CORNER RADII:

0.032 (0.81) MAX.

1.07

(27.18)

0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY

® ®

PANEL CUTOUT

2.118 (53.80)

2.35 (59.69)

1.270

(32.26)

0.116
(2.95)

0.878

(22.30)

0.096

(2.44)

ISO 9001

REGISTERED

MADE IN USA

BEZEL

RETAINING CLIP INSTALLATION

MADE IN USA

® ®

® ®

A panel-mount retaining clip is supplied with all models.

PANEL

OPTIONAL

GASKET

PANEL

DS-0402B 12/99

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com E-mail: [e-mail]
Data sheet fax back: [phone]

DATEL 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. The DATEL logo is a registered DATEL, Inc. trademark.

DATEL (UK) LTD. Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]
DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]