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DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4? Digit
LCD Display Process Monitor
Performance/Functional Speci?cations
Typical at T A = +25°C, unless otherwise noted.
Display readings other than those shown in Table 1 are obtainable.
For example, some negative readings with a 4mA input are possible.
Current Loop Input
Full Scale Input Range (1)
Loop Burden (2)
Voltage Drop (2)
Overcurrent Protection
Min.
+3.8
–
–
–
Typ.
–
–
2.9
–
Max.
+20.4
190
3.8
±40
Units
mA
Ohms
Volts
mA
Consult DATEL for more information regarding display readings not
shown in the table.
(2) Max. Loop-Voltage Drop/Max. Loop impedance : The maximum loop
voltage-drop and maximum loop impedance (burden) are both speci-
?ed with the meter con?gured for DIP-Switch setting #20 and an input
loop current of 20.0mA.
Performance
(3) Temperature Drift: Temperature drift of zero and temperature drift of
Sampling Rate
Accuracy (1 minute warm-up)
2.5 reading per second
±0.05%FS ±1 Count
gain are both speci?ed with the meter con?gured for range #20 with a
4mA input adjusted (using R3) to read “0000” ±1 count, and a 20mA
Temperature Drift of Span (3)
Temperature Drift of Zero (3)
–
–
±0.3
±0.2
±0.6
±0.5
Cnts/°C
Cnts/°C
input adjusted (using R7) to read “19000” ±2 counts at an initial ambi-
ent temperature of 25°C.
Display
Display Type and Size
Polarity Indication
Overrange Indication
4? digit, 0.4"/10.2mm high LCD
"–" for negative readings
"–1_ _ _ " for negative inputs
The temperature drift of gain is proportional to the selected full-scale
range. It is typically less pronounced at the lower range settings, that
is, if the observed gain drift of a particular meter is +12 counts when
reading “19000” on range #20 at 40°C, the same meter will most
likely have a drift of only +6 counts when reading “9000” on range
Physical/Environmental
"1_ _ _ " for positive inputs
#12 at 40°C.
The normally very accurate, temperature-insensitive autozero feature
Operating Temperature
Storage Temperature
Humidity (non-condensing)
0
–20
0
–
–
–
+50
+75
95
°C
°C
°C
of the DMS-40LCD-4/20S’s built-in analog-to-digital converter (A/D)
is not a signi?cant factor in determining the meter’s overall zero-
reading stability over its rated operating temperature because an
offset voltage is applied to the A/D’s LO input. This offset is used to
Case Material
Weight
Ordering Information
Polycarbonate
0.1 ounces (28 grams)
null the signal voltage developed with a 4mA input. In order for the
A/D to display a steady “0000” ±1 digit, the autozero circuitry requires
both A/D inputs to always be at exactly zero volts.
The meter’s zero-reading stability over its speci?ed operating
temperature is affected by the drift of three terms: the voltage
DMS-40LCD-4/20S
DMS-BZL1
DMS-BZL2
DMS-30-CP
4? digit, LCD, loop-powered meter
Panel-mount bezel assembly
Panel-mount bezel assembly with
sealing gasket
Panel cutout punch
developed by the meter’s offset circuitry; the voltage developed
across the meter’s input resistors with a 4mA input; and the stability of
the applied 4mA input signal itself. In the lower DIP-switch settings
(ranges #1-4), the meter’s parasitic etch and switch impedances also
contribute a small error voltage.
A panel-mount retaining clip is supplied with each meter.
TECHNICAL NOTES
( 1) Full Scale Input: The Display readings shown in Table 1 can typically
be obtained with transmitters having a low-level output of 3.8 to 4.3mA
and a full-scale output of 19.4 to 20.4mA. When using a transmitter
whose output falls outside these ranges and the desired display read-
ings are close to the upper or lower adjustment limits of the selected
DIP-switch setting #, try using the next highest DIP-switch setting #
if, after adjusting R7, the display reading is still too low, or the next
lowest setting # if the display reading is still too high (see example
number 2). Please keep in mind that the DMS-40LCD meter from
which the DMS-40LCD-4/20S is derived has an accuracy speci?cation
of ±3 counts (max.); thus, it may not always be possible to obtain the
exact desired display readings. A change of ±1 count is de?ned as the
right-hand most digit going up or down by one.
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The meter’s performance with regards to span stability over
temperature is affected by the drift of the meter’s gain circuitry and
loop input-resistors. To minimize these drifts in applications requiring
the utmost in temperature stability, where possible, the meter should
be calibrated at its anticipated operating temperature.
Since the DMS-40LCD-4/20S uses extremely-stable thin-?lm chip
resistors, periodic re-calibration is typically required only in
environmentally demanding applications where shock, vibration,
and/or temperature extremes may have a detrimental effect on the
20-turn potentiometers.
DECIMAL POINT SETTINGS
Using the chart below as a guide, the DMS-40LCD-4/20S’s decimal
points can be con?gured to suit the user’s particular readout
requirements. To enable a desired decimal point place its DIP switch
to the ON position (up). Please note that the decimal points are
merely placeholders, that is, they can all be on or all off; they do not
affect the meter’s operation and/or display readings.
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS401LCD-420S.D02 Page 2 of 5
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