DATEL 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

® ®

DMS-40PC-4/20S

4-20mA Input

4½ Digit Process Monitors

with Full-Size LED Displays

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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)

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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