DMS-30LCDA-4/20I (Inverse Reading)

The DMS-30LCDA-4/20I is designed to accommodate applications where

an

increasing loop current produces a decreasing display reading. That

is, as the loop current is increased from 4mA to 20mA, the display will read

a user determined full-scale positive number at 4mA and then decrease to

“000” at 20mA. The ‘4/20I’ model is essentially a ‘-4/20S’ model operating

in reverse. Table 5 and the two examples that follow describe the operation

of this model in greater detail.

The first step when configuring the DMS-30LCDA-4/20I for the first time,

or when changing to a different range, is to set both R3 and R7 to their full

clockwise positions, roughly 22 turns. Next, using the desired display read-

ings, select the appropriate DIP-switch setting number from Table 5.

Examples (DMS-30LCDA-4/20I, Inverse Reading)

1. Desired display readings are:

4mA = “6.00”

20mA = “0.00”

Use DIP-switch setting #3 in Table 5 and enable decimal point DP2 via SW7.

Apply 20mA and adjust R3 so the display reads “0.00”. Apply 4mA and

adjust R7 so the display reads “6.00”.

2. Desired display readings are:

4mA = “800”

20mA = “000”

Use DIP-switch setting #2 in Table 5. Apply 20mA and adjust R3 so the

display reads “000”. Apply 4mA and adjust R7 so the display reads “800”.

For these display readings, no decimal points are used. Set SW6, SW7 and

SW8 to OFF.

Table 5. DMS-30LCDA-4/20I (Inverse Reading) DIP Switch Settings

Desired Display Reading

4mA

20mA

SW1

SW2

SW3

SW4

SW5

1. 1999 to 1300

000

Off

Off

Off

Off

NA

2. 1300 to 850

000

On

Off

Off

Off

NA

3. 850 to 550

000

Off

On

Off

Off

NA

4. 550 to 350

000

Off

Off

On

Off

NA

5. 350 to 200

000

On

On

On

Off

NA

6. 200 to 130

000

On

On

On

On

NA

Table 6. Decimal Point Selections (All Models)

To turn on a decimal point, place its respective DIP switch to the fully ON position.

SW6

SW7

SW8

DP1

DP2

DP3

5

6

7

8

1

2

3

4

ON

5

6

7

8

1

2

3

4

ON

MECHANICAL DIMENSIONS: Inches (mm)

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)

MECHANICAL SPECIFICATIONS

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DIP

Switches

Gain

Adjust

Zero

Adjust

+ –

Loop

Input

DP2

(SW7)

DP3

(SW8)

DP1

(SW6)

Back View

Front View

1

R3

Zero

Adjust

R7

Gain

Adjust

5

6

7

8

1

2

3

4

ON

+

–

TB1

DMS-30LCDA-4/20 Series

Loop-Powered, 1.8V Drop, 4-20mA Process

Monitors with Full-Size LCD Displays

MPM_DMS30-LCDA.B02 Page 5 of 6

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