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DMS-20LCD-4/20 Series
4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop
3? Digit LCD Display Process Monitors
Performance/Functional Speci?cations
Typical at T A = +25°C, unless otherwise noted.
Current Loop Inputs
Full Scale Input Range ?
Input Impedence ?
Voltage Drop ?
Overvoltage Protection ?
Min.
+3.8
–
–
–
Typ.
–
80
1.8
–
Max.
+20.4
100
2.0
±40
Units
mA
Ω
Volts
mA
performing DIP-switch settings, be sure the DIP switch's small actuators
are ?rmly engaged in their fully-ON or fully-OFF positions.
1 . Set R7 (full scale span/gain adjust) and R3 (zero/offset adjust) fully
clockwise, roughly 22 turns, and place SW1-SW6 to OFF.
2 . Select DIP switch setting #2.
1 . Set R7 (full scale span/gain adjust) and R3 (zero/offset adjust) fully
Performance
clockwise, roughly 22 turns, and place SW1-SW6 to OFF.
Sampling Rate
Accuracy (1 minute warm-up):
2.5 reading per second
±0.05%FS ±1 Count
2 . Select DIP switch setting #2.
3 . Apply a precision 4mA input, with proper polarity, and adjust R3 until
Temperature Drift (0 = +60°C)
–
±0.15
±0.3
Cnts/°C
the meter's display reads "000".
Display
4. Apply a precision 20mA input and adjust R7 until the meter's display
Display Type and Size
Polarity Indication
Overrange Indication
3? digit, 0.37"/9.4mm high LCD
"–" for negative readings
"–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
reads "1000". Repeat steps 3 and 4 to make sure the adjustments do
not affect one another.
5 . Select the appropriate decimal point by setting SW4, SW5 or SW6 to
ON (DP1, DP2 or DP3 respectively).
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
0
–20
0
–
–
–
+60
+75
95
°C
°C
%
NOTE: If a display reading other than "000" to "1000" is desired,
refer to DIP–Switch Settings Table 1 for SW1–SW3 settings.
Examples (DMS-20LCD-4/20S-Unipolar Model)
Case Material
Weight
Polycarbonate
0.6 ounces (17 grams)
1. Desired display readings are:
4mA ="0.00"
ON
? The DMS-20LCD-4/20, using any of the DIP-switch settings described above,
20mA = "6.00"
1
2
3
4
5
6
can withstand overcurrents, including those resulting from accidental reverse-
polarity connections, up to ±40mA without sustaining any damage.
? Because DATEL's DMS-4/20 loop-powered meters employ active circuitry to
convert the loop current into a voltage, the meters' effective series impedance
Use DIP-switch setting #3 in Table 1 and enable decimal point DP2 via
SW5. Apply 4mA and adjust R3 so the display reads "0.00". Apply
20mA and adjust R7 so the display reads "6.00".
varies in a manner that maintains the loop voltage drop constant over the full
4-to-20mA current range. Listed impedance speci?cation applies at 20mA.
2. Desired display readings are:
4mA = "000"
ON
20mA = "800"
1
2
3
4
5
6
Ordering Information
Use DIP-switch setting #2 in Table 1. Apply 4mA and adjust R3 so the
DMS-20LCD-4/20S-C
DMS-20LCD-4/20B-C
DMS-20LCD-4/20P-C
Unipolar reading, loop-powered LCD meter
Bipolar reading, loop-powered LCD meter
Positive reading, loop-powered LCD meter
display reads "000". Apply 20mA and adjust R7 so the display reads
"800". For these display readings, no decimal points are used. Set
SW4, SW5 and SW6 to OFF.
DMS-BZL3-C Bezel assembly
DMS-BZL4-C Bezel assembly with sealing gasket
DMS-20-CP Panel cutout punch
A panel-mount retaining clip is supplied with each model.
3. Desired display readings are:
4mA = ".000"
12mA = ".250"
1
2
3
ON
4
5
6
This example is not as straightforward as the previous two. Notice that
12mA is exactly halfway between 4mA and 20mA. If we assume that
OPERATING AND SETUP INSTRUCTIONS
DMS-20LCD-4/20S (Unipolar Reading Model)
As shipped, the DMS-20LCD-4/20S is factory calibrated to read "000"
for a 4mA input and "1000" for a 20mA input. The following worst-case
procedure assumes the DMS-20LCD-4/20S is completely mis-adjusted,
i.e., both potentiometers and the DIP switches are randomly set. When
www.murata-ps.com/dpm
the input could go up to 20mA, the display reading would then be: 2
x .250 or ".500". From Table 1 we can now select DIP-switch setting
#4 and enable DP1 via SW4. Apply 4mA and adjust R3 so the display
reads ".000". Apply 12mA and adjust R7 so the display
reads ".250".
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS20LCD-420.B03 Page 2 of 6
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