DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
Technical enquiries
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+1 508 339 3000
www.murata-ps.com
MPM_DMS401LCD-420S.D01
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