DMS-30LCDA-4/20 Series
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).
NOTE: If a display reading other than “000” to “1000” is desired,
refer to DIP-Switch Settings Table 2 for SW1-SW5 settings
Table 2.
4mA
Loop-Powered, 1.8V Drop, 4-20mA Process
Monitors with Full-Size LCD Displays
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.
DMS-30LCDA-4/20B (Standard Unipolar) DIP Switch Settings
20mA
SW1
Off
On
Off
On
On
SW2
Off
Off
Off
On
On
SW3
Off
Off
On
On
On
SW4
Off
Off
Off
Off
On
SW5
Off
Off
Off
Off
Off
Desired Display Reading
1.
000 to 1200 to 1999
2.
000 to 600 to 1200
3.
000 to 400 to 600
4.
000 to 200 to 400
5.
000 to 100 to 200
Examples
(DMS-30LCDA-4/20S, Unipolar)
1.
Desired display readings are:
4mA ="0.00"
20mA = "6.00"
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Table 3.
DMS-30LCDA-4/20B (Bipolar) DIP Switch Settings
Desired Display Reading
4mA
12mA
000
000
000
000
20mA
600 to 1000
350 to 650
250 to 400
150 to 250
100 to 150
SW1
Off
On
Off
Off
On
SW2
Off
Off
On
Off
On
SW3
Off
Off
Off
On
On
SW4
NA
NA
NA
NA
NA
SW5
NA
NA
NA
NA
NA
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1.
–600 to –1000 000
2.
–350 to –650
3.
–250 to –400
4.
–150 to –250
5.
–100 to –150
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"
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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"
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Examples
(DMS-30LCDA-4/20B, Bipolar )
1.
Desired display readings are:
4mA ="–1.00"
20mA = "1.00"
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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”.
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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"
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DMS-30LCDA-4/20B
(Bipolar-Reading
)
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.
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.
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MPM_DMS30-LCDA.B02
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