Table 2. DMS-30LCDA-4/20B (Standard Unipolar) DIP Switch Settings

NOTE: If a display reading other than “000” to “1000” is desired,

refer to DIP-Switch Settings Table 2 for SW1-SW5 settings

1. Desired display readings are:

4mA ="0.00"

20mA = "6.00"

Use DIP-switch setting #3 in Table 2 and enable decimal point DP2 via SW7.

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

adjust R7 so the display reads “6.00”.

2. Desired display readings are:

4mA =" 000"

20mA = "800"

Use DIP-switch setting #2 in Table 2. Apply 4mA and adjust R3 so the display

reads “000”. Apply 20mA 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:

4mA = ".000"

12mA = ".250"

This example is not as straightforward as the previous two. Notice that 12mA

is exactly halfway between 4mA and 20mA. If we assume that the input could

go up to 20mA, the display reading would then be: 2 x .250 or “.500”. From

Table 2 we can now select DIP-switch setting #3 and enable DP1 via SW6.

Apply 4mA and adjust R3 so the display reads “.000”. Apply 12mA and

adjust R7 so the display reads “.250”.

Examples (DMS-30LCDA-4/20S, Unipolar)

The DMS-30LCDA-4/20B’s zero-offset circuit differs from the unipolar ‘S’

model described above in that with the ‘B’ model, a half-scale 12mA input is

typically set to display “000”. Therefore, all of the of the DIP-switch settings in

Table 3 assume a reading of “000” is desired with a half-scale 12mA input.

Display readings other than those shown in Table 3 are possible, contact

DATEL for more information.

Desired Display Reading

4mA 20mA

SW1

SW2

SW3

SW4

SW5

1. 000 to 1200 to 1999

Off

Off

Off

Off

Off

2. 000 to 600 to 1200

On

Off

Off

Off

Off

3. 000 to 400 to 600

Off

Off

On

Off

Off

4. 000 to 200 to 400

On

On

On

Off

Off

5. 000 to 100 to 200

On

On

On

On

Off

Table 3. DMS-30LCDA-4/20B (Bipolar) DIP Switch Settings

Desired Display Reading

4mA

12mA

20mA

SW1

SW2

SW3

SW4

SW5

1. –600 to –1000 000

600 to 1000

Off

Off

Off

NA

NA

2. –350 to –650

000

350 to 650

On

Off

Off

NA

NA

3. –250 to –400

000

250 to 400

Off

On

Off

NA

NA

4. –150 to –250

000

150 to 250

Off

Off

On

NA

NA

5. –100 to –150

000

100 to 150

On

On

On

NA

NA

4. Apply a precision 20mA input and adjust R7 until the display reads “1800”.

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).

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When configuring the DMS-30LCDA-4/20B for the first time, or when selecting a

new range, set both R3 and R7 fully clockwise (roughly 22 turns) to their minimum

offset/minimum-span positions, respectively. Then select the desired readings from

Table 3 and configure DIP-switches SW1, SW2, and SW3 accordingly. Please note,

positions SW4 and SW5 are not used in bipolar ‘B’ models.

The procedure below illustrates how to calibrate the DMS-30LCDA-4/20B to its

factory-calibrated readings of “-1000” with a 4mA input and “1000” with a 20mA

input. When performing DIP-switch settings, be sure the DIP-switch’s small actuators

are firmly engaged in their fully ON or fully OFF positions.

1. Set both R3 and R7 fully clockwise.

2. Select DIP-switch setting #1 from Table 3.

3. Apply a precision 12mA input and adjust R3 until the meter’s display reads “000”.

4. Apply a precision 20mA input and adjust R7 until the meter’s display reads “1000”.

5. Apply a precision 4mA input and the display should read “-1000”. Repeat steps 3

and 4 to make sure the two adjustments did not affect one another.

1. Desired display readings are:

4mA ="–1.00"

20mA = "1.00"

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

Apply 12mA and adjust R3 so the display reads “0.00”. Apply 20mA and

adjust R7 so the display reads “1.00”. Apply 4mA and verify that the display

reads “-1.00”, readjust R3 and R7 if necessary.

2. Desired display readings are:

4mA =" –450"

20mA = "450"

Use DIP-switch setting #2 in Table 3. Apply 12mA and adjust R3 so the

display reads “000”. Apply 20mA and adjust R7 so the display reads “450”.

Apply 4mA and verify that the display reads “-450”. Repeat adjustment pro-

cedure if necessary. For these display readings, no decimal points are used.

Set SW6, SW7and SW8 to OFF.

Examples (DMS-30LCDA-4/20B, Bipolar )

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DMS-30LCDA-4/20 Series

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

Monitors with Full-Size LCD Displays

MPM_DMS30-LCDA.B02 Page 3 of 6

www.murata-ps.com