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DMS-20PC-4/20 Series
Subminiature 4-20mA Loop-Powered
3? Digit LED Process Monitors
fully clockwise (roughly 22 turns) to their minimum offset/minimum span
positions, respectively.
Table 4. Decimal Point Settings
The next step is to calculate the required display differential-reading; this
is accomplished by subtracting the desired 4mA display reading from
SW4
DP1
SW5
DP2
SW6
DP3
the desired 20mA display reading, disregarding decimal points. Then,
using the calculated differential display-reading to select the appropriate
DIP-switch setting # from Table 3, con?gure DIP-switches SW1, SW2, and
Examples (DMS-20PC-4/20P-Positive Model)
SW3 accordingly. Make certain that the DIP-switch’s small actuators are
?rmly engaged in their fully-ON or fully-OFF positions.
1. Desired display readings are:
4mA = “650”
ON
The procedure below describes how to calibrate the meter for an applica-
20mA = “950”
1
2
3
4
5
6
tion which the DMS-20PC-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.
1. Set R3 fully counterclockwise (minimum offset position) and R7 fully
clockwise (minimum differential span position), roughly 22 turns.
Use DIP-switch setting #4 in Table 3 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 differential value previously calculated). Apply 4mA and
adjust R3 until the display reads “650”. Apply 20mA and verify that the
display reads “950”.
2. Subtract 040 from 200 to yield a differential value of 160; use this value
to select DIP-switch setting #5 in Table 3. Enable decimal point DP3 by
placing SW6 to the ON position.
2. Desired display readings are:
4mA = “4.00”
ON
3. Set the transmitter’s output to 4.0mA and carefully adjust R3 clockwise
20mA = “19.99”
1
2
3
4
5
6
until the meter’s display reads “000”.
4. Set the transmitter’s output to 20.0mA and adjust R7 counterclock-
wise until the meter’s display reads “16.0”.
5. Set the transmitter back to 4.0mA and slowly adjust R3 clockwise until
the 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.
Table 3. DMS-20PC-4/20P (Positive Reading Model)
DIP-Switch Settings
This example illustrates the DMS-20PC-4/20P’s capability to display
higher differential readings than those indicated in Table 3. This
example also illustrates how the DMS-20PC-4/20P can be used to
display the output levels of a 4-20mA loop transmitter with higher preci-
sion (0.01mA versus 0.1mA) than described above.
Subtracting 400 from 1999 yields a differential of 1599, a value not
listed in Table 3. However, use DIP-switch setting #1 in Table 3 since
this setting has the highest overall offset/span adjustment capabilities.
Enable DP2 via SW5 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
Display Reading
SW1 SW2
SW3
and check to see that the display reads “19.99” or just overranges
Differential Range
4mA Input
20mA Input
(“1—“). Repeat adjustment procedure if necessary.
1 .
2.
3.
4.
5.
800-1400
500-800
350-500
250-350
150-250
900
850
800
750
750
1700
1350
1150
1000
900
Off
On
Off
Off
On
Off
Off
On
Off
On
Off
Off
Off
On
On
www.murata-ps.com/dpm
29 Mar 2011
email: sales@murata-ps.com
MPM_DMS20PC-4/20.C05 Page 4 of 6
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