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DMS-40LCD-4/20S Series

Ultra-Low 2.9V Loop-Drop 4½ Digit

LCD Display Process Monitor

MPM_DMS401LCD-420S.D02 Page 3 of 5

OPERATING AND SETUP INSTRUCTIONS

Switch S2

SW3

SW4

SW5

SW6

DP1

DP2

DP3

DP4

The following procedure must be performed as the first re-calibration step

every time DIP-switches S1 and S2 are reconfigured to select a new display

range. The following procedure assumes the DMS-40LCD-4/20S is initially

completely mis-adjusted, i.e., both potentiometers and DIP-switches S1 and

S2 are randomly set. Make sure that all DIP-switch actuators are pushed as

far as they will go to their designated ON (closed) or OFF (open) positions.

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 potentiom-

eter) until the display reads the maximum desired reading. Repeat steps

2 and 3 to make sure the adjustments did not affect one another.

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.

NOTE: Please keep in mind the transmitter’s 4mA and 20mA output accu-

racy may affect display readings which are at, or very close to, the high and

low limits 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. Recall that R3 and R7 must be set to their full clock-

wise position before calibrating the meter.

1. Desired display readings are:

4mA = “0.000”

20mA = “3.000”

Use DIP-switch setting #3 in Table 1 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”

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 trans-

mitter’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

ON

ON

1

1

1

2

3

4

5

6

2

3

4

5

6

1

2

3

4

ON

ON

ON

1

1

1

2

3

4

5

6

2

3

4

5

6

1

2

3

4

ON

S1

S2

S1

S2

ON

ON

1

1

1

2

3

4

5

6

2

3

4

5

6

1

2

3

4

ON

S1

S2

Table 1. DIP-Switch Settings

ON

ON

1

1

1

2

3

4

5

6

2

3

4

5

6

1

2

3

4

ON

S1

S2

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 of switch S2 to OFF.

3. Desired display readings are:

4mA = “0000”

20mA = “10000”

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 of switch S2 to OFF.

4. Desired display readings are:

4mA = “.0000”

12mA = “.2500”

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 Table 1, 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”.

Switch S1

Switch S2

Display Reading

SW1

SW2

SW3

SW4

SW5

SW6

SW1 SW2

4mA

20mA

01.

0000

2250-2450

OFF

ON

ON

ON

OFF

OFF

ON

ON

02.

0000

2450-2800

OFF

ON

ON

ON

OFF

OFF

OFF

ON

03.

0000

2800-3200

OFF

ON

ON

ON

OFF

OFF

ON

OFF

04.

0000

3200-3850

OFF

ON

ON

ON

OFF

OFF

OFF

OFF

05.

0000

3850-4250

ON

OFF

ON

ON

OFF

OFF

ON

ON

06.

0000

4250-4800

ON

OFF

ON

ON

OFF

OFF

OFF

ON

07.

0000

4800-5500

ON

OFF

ON

ON

OFF

OFF

ON

OFF

08.

0000

5500-6200

ON

OFF

ON

ON

OFF

OFF

OFF

OFF

09.

0000

6200-6750

OFF

OFF

ON

ON

ON

OFF

ON

ON

10.

0000

6750-7700

OFF

OFF

ON

ON

ON

OFF

OFF

ON

11.

0000

7700-8600

ON

ON

OFF

ON

ON

OFF

ON

ON

12.

0000

8600-9800

ON

ON

OFF

ON

ON

OFF

OFF

ON

13.

0000

9800-10900

ON

ON

ON

OFF

OFF

ON

ON

ON

14.

0000

10900-12000

ON

ON

ON

OFF

OFF

ON

OFF

ON

15.

0000

12000-12800

ON

OFF

OFF

ON

OFF

ON

ON

ON

16.

0000

12800-14000

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

16300-17600 OFF

OFF

ON

OFF

ON

ON

ON

ON

20.

0000

17600-19999 OFF

OFF

ON

OFF

ON

ON

OFF

ON