DMS-30LCDA-4 MURATA-PS [Murata Power Solutions Inc.], DMS-30LCDA-4 Datasheet - Page 4

• Manufacturer Part Number: DMS-30LCDA-4
• Description: Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays
• Manufacturer: MURATA-PS [Murata Power Solutions Inc.]

DMS-30LCDA-4/20P (Positive-Reading)
1. Set R3 fully counterclockwise (minimum offset position) and R7 fully clock-
2. Subtract 040 from 200 to yield a differential-reading value of 160; use this
3. Desired display readings are:
The DMS-30LCDA-4/20P’s zero-offset circuit is optimized to produce posi-
tive readings at both 4mA and 20mA input levels. As shown in Table 4’s first
three columns, a 4mA input can be adjusted (using R3, Zero/Offset Adjust)
to display any positive reading between “000” and “800”. The corresponding
20mA-input reading is then added to the 4mA offset as a differential whose
magnitude is varied by adjusting R7 (Gain/Span Adjust).
The ‘Differential Range’ column in Table 4 lists the nominal differential display-
readings which can be obtained with R7 at, or very close to, its full-clockwise,
minimum span position. The ‘Differential Range’ column can be used as a
guide when configuring the meter for the majority of user applications. Higher
differential ranges are obtainable; however, the use of higher differential read-
ings results in correspondingly-lower positive readings with 4mA inputs, that
is, R3’s clockwise adjustment-range is reduced. Example #3 below illustrates
this point. Contact DATEL if there is any doubt as to whether or not the DMS-
30LCDA-4/20P can be configured for your display-reading requirements.
The first step when initially configuring the DMS-30LCDA-4/20P, or when
selecting a new range, is to set R3 fully counterclockwise and R7 fully
clockwise (roughly 22 turns each) to their minimum offset and minimum span
positions, respectively.
The next step is to calculate the differential display-reading; this is accom-
plished by subtracting the desired 4mA display reading from the desired
20mA display reading, disregarding decimal points. Then, using the calcu-
lated differential display-reading to select the appropriate DIP-switch setting
# from Table 4, configure DIP-switches SW1, SW2, and SW3 accordingly.
Please note, positions SW4 and SW5 are not used in positive reading ‘P’
models. Also, make certain that the DIP-switch’s small actuators are firmly
engaged in their fully ON or fully OFF positions.
The example below describes how to calibrate the meter for an application
which the DMS-30LCDA-4/20P easily accommodates: displaying the output
of a 4-20mA transmitter, that is, “04.0” with a 4mA input and “20.0” with a
20mA input.
wise (minimum differential span position), roughly 22 turns.
value to select DIP-switch setting #5 in Table 4. Enable decimal point DP3 by
placing SW8 to the ON position.
Notice that these readings can be obtained using either DIP-switch setting #1
or DIP-switch setting #2 in Table 3. In situations like this where DIP-switch
settings overlap, less-sensitive R3/R7 adjustments can be achieved if the
higher DIP-setting # is selected (setting #2 in this example). Apply 12mA
and adjust R3 so the display reads “000”. Apply 20mA and adjust R7 so
the display reads “650”. Apply 4mA and verify that the display reads “-650”.
Repeat adjustments if necessary.
4mA = "–650"
20mA = "650"
1
2
www.murata-ps.com
3
4
ON
5
6
7
8
Examples (DMS-30LCDA-4/20P, Positive Reading)
1. Desired display readings are:
2. Desired display readings are:
Loop-Powered, 1.8V Drop, 4-20mA Process
Table 4.
3. Set the transmitter’s output to 4.0mA and carefully adjust R3 clockwise until
4. Set the transmitter’s output to 20.0mA and adjust R7 counterclockwise until
5. Set the transmitter back to 4.0mA and slowly adjust R3 clockwise until the
1. 800 to 1400
2. 500 to 800
3. 350 to 500
4. 250 to 350
5. 150 to 250
* Setting SW5 to On will increase the differential range.
Use DIP-switch setting #4 in Table 4 since subtracting 650 from 950 yields
a differential value of 300. Apply 4mA and adjust R3 until the display reads
“000”. Apply 20mA and adjust R7 until the display reads “300” (the differ-
ential value previously calculated). Apply 4mA and adjust R3 until the display
reads “650”. Apply 20mA and verify that the display reads “950”.
This example illustrates the DMS-30LCDA-4/20P’s capability to display
higher differential readings than those indicated in Table 4. This example
also illustrates how the DMS-30LCDA-4/20P can be used to display the
output levels of a 4-20mA transmitter with higher precision (0.01mA versus
0.1mA) than the example previously described.
Subtracting 400 from 1999 yields a differential of 1599, a value not listed
in Table 4. However, use DIP-switch setting #1 in Table 4 and enable SW5
since this setting has the highest overall offset/span adjustment capabilities.
Enable DP2 via SW7, then apply 4mA and adjust R3 so the display reads
“0.00”. Apply 20mA and adjust R7 so the display reads “15.99”. Apply
4mA and adjust R3 until the display reads “4.00”. Apply 20mA and check
to see that the display reads “19.99” or just overranges (“1—”). Repeat
adjustment procedure if necessary.
See example 2 below.
the meter’s display reads “000”.
the meter’s display reads “16.0”.
display reads “04.0”. Reapply 20.0mA and the display should now read
“20.0”. Repeat steps 3, 4, and 5 to make sure the adjustments did not affect
one another.
Desired Display Readings
Diff. Range
DMS-30LCDA-4/20 Series
Monitors with Full-Size LCD Displays
4mA ="650"
20mA = "950"
4mA =" 4.00"
20mA = "19.99"
DMS-30LCDA-4/20P (Positive Reading)
DIP Switch Settings
Technical enquiries email: [e-mail], tel:
4mA
900
850
800
750
750
20mA
1700
1350
1150
1000
900
SW1
Off
On
Off
Off
On
1
MPM_DMS30-LCDA.B02 Page 4 of 6
1
2
SW2
Off
Off
On
Off
On
2
3
3
4
ON
SW3
Off
Off
Off
On
On
4
ON
5
5
6
[phone]
SW4
NA
NA
NA
NA
NA
6
7
7
8
SW5*
OFF
OFF
OFF
OFF
OFF
8