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DMS-40PC-4/20S
4? Digit, 4-20mA Input, LED Display Meters
Table 1. DIP-Switch Settings
Switch S1
Switch S2
Display Reading
SW1
SW2
SW3
SW4
SW5
SW6
SW1
SW2
4mA
20mA
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
0000 2250-2500
0000 2500-2800
0000 2800-3200
0000 3200-3850
0000 3850-4300
0000 4300-4900
0000 4900-5600
0000 5600-6200
0000 6200-6800
0000 6800-7750
0000 7750-8600
0000 8600-9850
0000 9850-11000
0000 11000-12000
0000 12000-13000
0000 13000-14000
0000 14000-15300
0000 15300-16300
0000 16300-17800
0000 17800-20000
Off
Off
Off
Off
On
On
On
On
Off
Off
On
On
On
On
On
On
On
On
Off
Off
On
On
On
On
Off
Off
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
On
On
Off
Off
On
On
Off
Off
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Off
Off
On
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
On
Off
Off
On
On
Off
Off
On
On
On
On
On
On
On
On
On
On
On
On
Since the DMS-40PC-4/20S uses extremely-stable thin-?lm chip
resistors, periodic re-calibration is typically required only in envi-
ronmentally demanding applications where shock, vibration and
temperature extremes may have a detrimental affect on the 20-turn
potentiometers.
(4) Input Grounding : Except for the “-I” suf?x models which feature
isolated current loop inputs, all other DMS-40PC-4/20S meters are
supplied with their 4-20mA negative-input terminals (TB1-2, “-”)
internally connected to their power supply ground terminal (TB2-2,
“-V”). This single-ended input con?guration is compatible with most
grounded-referenced 4-20mA transmitters.
Applications in which the DMS-40PC-4/20S and its associated
4-20mA transmitter are connected to a common ground and the
transmitter drives two or more loads (for example, the meter is in
series with a PLC) must have the meter connected as the ?rst device
in the current loop, that is, closest to the system ground (see Figure
2). If this connection scheme is not possible and/or the meter must
be connected in the middle of the current loop, then‘-I’ suf?x models
must be used to provide the required isolation between the meter’s
current loop input and the power supply ground (“-V”). See Figures 2,
3, 4, and 5 for typical loop connections.
Table 2. Decimal Point Settings
Using the Decimal Point Settings Table as a guide, the DMS-40PC-
4/20S's decimal points can be enabled to suit the user's particular
readout requirements. Place the selected decimal point's DIP switch to
the ON position (up) to illuminate the decimal point. The decimal points
are merely placeholders, that is, they can all be illuminated or all turned
off; they have no affect on the meter's operation and/or display readings.
OPERATING AND SETUP INSTRUCTIONS
The following procedure must be performed as the ?rst re-calibration step
every time DIP switches S1 and S2 are changed to select a new display
range. The following procedure also assumes the DMS-40PC-4/20S is
initially completely mis-adjusted, i.e., both potentiometers and both DIP
switches S1 and S2 are randomly set. When performing switch settings,
make sure that the DIP switch's small actuator is pushed up as far as it
will go to ensure that the switch is truly set to the ON (closed) position.
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 posi-
tions 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
SW3
DP1
SW4
DP2
Switch S2
SW5
DP3
SW6
DP4
potentiometer) until the display reads the maximum desired reading.
Repeat steps 2 and 3 to make sure the adjustments did not affect
one another.
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MPM_DMS-40PC-420.D03 Page 3 of 6
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