Datel muRata PS DMS-40LCD-4/20S Series User manual

DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com Technical enquiries email: [email protected], tel: [phone]
MPM_DMS401LCD-420S.D01 Page 1 of 5
The DMS-40LCD-4/20S’s ultra-low 2.9V typical loop-drop (190-Ohm burden) makes it
ideal for use in 4-20mA process monitoring applications which have two or more series-
connected loop-monitoring devices. The low loop-burden means it can be used in current
loops that are powered from supply voltages as low as +8Vdc! The DMS-40LCD-4/20S is
self-powered; all required operating power is derived directly from the current loop itself.
It requires no separate dc power supply or special grounding considerations and can be
connected ANYWHERE in the loop!
The DMS-40LCD-4/20S's input, span, and offset circuits all employ super-stable,
±0.5% thin-film chip resistors. Long-term stability and accuracy are assured by driving
these tight-tolerance resistors with an ultra-stable, ±0.2% band-gap voltage reference.
Unlike many competitor’s designs, the two precision 20-turn span and zero adjust poten-
tiometers do not interact with one another. Its full-size, 0.40" (10.0mm) high-contrast 4½
digit LCD display offers 19,999 counts of resolution and can be read in virtually any lighting
condition—including full sunlight!
All range-change and decimal point selections are made by configuring two gold-plat-
ed, vibration-resistant, six-position DIP switches. The two connections to the current loop
are made via a reliable, screw-type terminal block. To further enhance reliability, the design
features 100% soldered connections—no troublesome zebra/elastomercic connectors are
used. All these outstanding features make the DMS-40LCD-4/20S the highest quality, most
rugged, 4½ digit, LCD-display process monitor available.
FEATURES
■Loop-powered, no power supply required!
■2.9V typical loop-drop; 190-Ohm (max.) loop
impedance
■Dip-switch-selectable range, offset, and
decimal points
■Hundreds of different input/readout combinations
■Non-interacting gain (span) and offset (zero)
20-turn potentiometers
■Large, 0.40" (10.0mm) high, sunlight-viewable
LCD digits
■Miniature size: 2.17" x 0.92" x 0.90" (55mm x
23mm x 23mm)
■Vibration-resistant package; reliable screw-
terminal connections
■100% soldered connections
Figure 1. DMS-40LCD-4/20S Simplified Schematic
DATA
4½ DIGIT A/D
CONVERTER
DP3
DP2DP1
ZERO
ADJUST
GAIN
ADJUST
CURRENT TO
VOLTAGE
CONVERTER
DP4
R3 R7
Range Offset Gain
S1 S2
ON
ON
1
1
123456
23456
ON
ON
1
1
123456
23456
+ –
TB1
4-20mA
–+
DC/DC
CONVERTER
BAND-GAP
REFERENCE
CIRCUIT
+5V –5V
1 2
Current Loop Input

DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
Technical enquiries email: [email protected], tel: [phone]www.murata-ps.com
MPM_DMS401LCD-420S.D01 Page 2 of 5
TECHNICAL NOTES
DECIMAL POINT SETTINGS
Performance/Functional Specifications
Typical at TA= +25°C, unless otherwise noted.
(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 specification
of ±3 counts (max.); thus, it may not always be possible to obtain the
exact desired display readings. A change of ±1 count is defined as the
right-hand most digit going up or down by one.
DMS-40LCD-4/20S 4½ digit, LCD, loop-powered meter
DMS-BZL1 Panel-mount bezel assembly
DMS-BZL2 Panel-mount bezel assembly with
sealing gasket
DMS-30-CP Panel cutout punch
A panel-mount retaining clip is supplied with each meter.
Display readings other than those shown in Table 1 are obtainable.
For example, some negative readings with a 4mA input are possible.
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-
fied with the meter configured for DIP-Switch setting #20 and an input
loop current of 20.0mA.
(3) Temperature Drift: Temperature drift of zero and temperature drift of
gain are both specified with the meter configured for range #20 with a
4mA input adjusted (using R3) to read “0000” ±1 count, and a 20mA
input adjusted (using R7) to read “19000” ±2 counts at an initial ambi-
ent temperature of 25°C.
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
#12 at 40°C.
The normally very accurate, temperature-insensitive autozero feature
of the DMS-40LCD-4/20S’s built-in analog-to-digital converter (A/D)
is not a significant 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
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 specified operating
temperature is affected by the drift of three terms: the voltage
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.
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-film 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.
Using the chart below as a guide, the DMS-40LCD-4/20S’s decimal
points can be configured 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.
Current Loop Input Min. Typ. Max. Units
Full Scale Input Range (1) +3.8 – +20.4 mA
Loop Burden (2) – – 190 Ohms
Voltage Drop (2) – 2.9 3.8 Volts
Overcurrent Protection – – ±40 mA
Performance
Sampling Rate 2.5 reading per second
Accuracy (1 minute warm-up) ±0.05%FS ±1 Count
Temperature Drift of Span (3) – ±0.3 ±0.6 Cnts/°C
Temperature Drift of Zero (3) – ±0.2 ±0.5 Cnts/°C
Display
Display Type and Size 4½ digit, 0.4"/10.2mm high LCD
Polarity Indication "–" for negative readings
Overrange Indication "–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
Physical/Environmental
Operating Temperature 0 – +50 °C
Storage Temperature –20 – +75 °C
Humidity (non-condensing) 0 – 95 °C
Case Material Polycarbonate
Weight 0.1 ounces (28 grams)
Ordering Information

DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
Technical enquiries email: [email protected], tel: [phone]www.murata-ps.com
MPM_DMS401LCD-420S.D01 Page 3 of 5
OPERATING AND SETUP INSTRUCTIONS
Switch S2
SW3 SW4 SW5 SW6
DP1 DP2 DP3 DP4
The following procedure must be performed as the first re-calibration step
every time DIP-switches S1 and S2 are reconfigured to select a new display
range. The following procedure assumes the DMS-40LCD-4/20S is initially
completely mis-adjusted, i.e., both potentiometers and DIP-switches S1 and
S2 are randomly set. Make sure that all DIP-switch actuators are pushed as
far as they will go to their designated ON (closed) or OFF (open) positions.
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 positions
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 potentiom-
eter) until the display reads the maximum desired reading. Repeat steps
2 and 3 to make sure the adjustments did not affect one another.
4. If necessary, select the appropriate decimal point by setting either
SW3, SW4, SW5, or SW6 of S2 to ON (DP1, DP2, DP3, or DP4,
respectively.
NOTE: Please keep in mind the transmitter’s 4mA and 20mA output accu-
racy may affect display readings which are at, or very close to, the high and
low limits of the selected range. See Example #2 below and Technical Note 1
for more information).
Examples
The examples below illustrate how to configure the meter to perform some
typical measurements. Recall that R3 and R7 must be set to their full clock-
wise position before calibrating the meter.
1. Desired display readings are:
4mA = “0.000”
20mA = “3.000”
Use DIP-switch setting #3 in Table 1 and enable decimal point DP2
by placing SW4 of switch S2 to ON. Apply 4mA and adjust R3 so the display
reads “0.000”. Apply 20mA and adjust R7 so the display reads “3.000”.
2. Desired display readings are:
4mA = “0000”
20mA = “8600”
Use DIP-switch setting #11. Apply 4mA and adjust R3 so the display reads
“0000”. Apply 20mA and adjust R7 so the display reads “8600”. If the trans-
mitter’s full-scale output is less than 20.0mA, it may not be possible to adjust
R7 for a reading of “8600” with setting #11. If this occurs, select setting #12
ON
ON
1
1
123456
234561234
ON
ON
ON
1
1
123456
234561234
ON
S1 S2
S1 S2
ON
ON
1
1
123456
234561234
ON
S1 S2
Table 1. DIP-Switch Settings
ON
ON
1
1
123456
234561234
ON
S1 S2
and re-calibrate both R3 and R7 to obtain “0000” and “8600”. Note that
for these display readings no decimal points are used. Set SW3, SW4,
SW5 and SW6 of switch S2 to OFF.
3. Desired display readings are:
4mA = “0000”
20mA = “10000”
Use DIP-switch setting #13. Apply 4mA and adjust R3 so the display
reads “0000”. Apply 20mA and adjust R7 so the display reads “10000”.
For these display readings no decimal points are used. Set SW3, SW4,
SW5 and SW6 of switch S2 to OFF.
4. Desired display readings are:
4mA = “.0000”
12mA = “.2500”
This example is not as straightforward as the previous three. Notice that
12mA is exactly halfway between 4mA and 20mA. If we assume the
input could go up to 20mA, the display reading would then be 2 x .2500
or “.5000”. From Table 1, select DIP-switch setting #7 and enable DP1
via SW3 of switch S2. Apply 4mA and adjust R3 so the display reads
“.0000”. Apply 12mA and adjust R7 so the display reads “.2500”.
Switch S1 Switch S2
Display Reading SW1 SW2 SW3 SW4 SW5 SW6 SW1 SW2
4mA 20mA
01. 0000 2250-2450 OFF ON ON ON OFF OFF ON ON
02. 0000 2450-2800 OFF ON ON ON OFF OFF OFF ON
03. 0000 2800-3200 OFF ON ON ON OFF OFF ON OFF
04. 0000 3200-3850 OFF ON ON ON OFF OFF OFF OFF
05. 0000 3850-4250 ON OFF ON ON OFF OFF ON ON
06. 0000 4250-4800 ON OFF ON ON OFF OFF OFF ON
07. 0000 4800-5500 ON OFF ON ON OFF OFF ON OFF
08. 0000 5500-6200 ON OFF ON ON OFF OFF OFF OFF
09. 0000 6200-6750 OFF OFF ON ON ON OFF ON ON
10. 0000 6750-7700 OFF OFF ON ON ON OFF OFF ON
11. 0000 7700-8600 ON ON OFF ON ON OFF ON ON
12. 0000 8600-9800 ON ON OFF ON ON OFF OFF ON
13. 0000 9800-10900 ON ON ON OFF OFF ON ON ON
14. 0000 10900-12000 ON ON ON OFF OFF ON OFF ON
15. 0000 12000-12800 ON OFF OFF ON OFF ON ON ON
16. 0000 12800-14000 ON OFF OFF ON OFF ON OFF ON
17. 0000 14000-15300 ON OFF ON OFF ON ON ON ON
18. 0000 15300-16300 ON OFF ON OFF ON ON OFF ON
19. 0000 16300-17600 OFF OFF ON OFF ON ON ON ON
20. 0000 17600-19999 OFF OFF ON OFF ON ON OFF ON

DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
Technical enquiries email: [email protected], tel: [phone]www.murata-ps.com
MPM_DMS401LCD-420S.D01 Page 4 of 5
APPLICATIONS
Figure 2. Typical DMS-40LCD-4/20S Connections
A/D
PROGRAMMABLE
LOGIC CONTROLLER
TRANSMITTER &
SIGNAL CONDITIONER
+
–
–
DMS-40LCD-4/20S
+–
Vsig
+
GAIN
ZERO
+24V
4-20mA
4-20mA
+
–
+24Vdc
SUPPLY
+
(TB1-1)
R7
R3
(TB1-2)
TRANSDUCER
INPUT

DMS-40LCD-4/20S Series
Ultra-Low 2.9V Loop-Drop 4½ Digit
LCD Display Process Monitor
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice. © 2008 Murata Power Solutions, Inc.
USA: Mansfield (MA), Tel: [phone], email: [email protected]
Canada: Toronto, Tel: [phone], email: [e-mail]
UK: Milton Keynes, Tel: [phone], email: [email protected]
France: Montigny Le Bretonneux, Tel: [phone], email: [email protected]
Germany: München, Tel: [phone], email: [email protected]
Japan: Tokyo, Tel: [phone], email: [e-mail]
Osaka, Tel: [phone], email: [email protected]
Website: www.murata-ps.jp
China: Shanghai, Tel: [phone], email: [email protected]
Guangzhou, Tel: [phone], email: [email protected]
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: [phone] [phone] Fax: [phone]
www.murata-ps.com email: [email protected] ISO 9001 REGISTERED
Technical enquiries email: [email protected], tel: [phone]www.murata-ps.com
MPM_DMS401LCD-420S.D01 Page 5 of 5
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
WIRE SIZE: 18 to 26 AWG (Solid or stranded)
STRIPPING LENGTH: 0.20" (5.08mm)
#2-56 INSERT
0.156 (3.96) DEEP
FRONT VIEW
1.270
(32.26)
0.187
(4.75)
OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2)
2.35 (59.69)
2.118 (53.80)
0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
1.07
(27.18)
0.878
(22.30)
0.096
(2.44)
0.116
(2.95)
2.55 (64.77)
PANEL CUTOUT
A panel-mount retaining clip is supplied with all models.
MADE IN USA
®®
PANEL
BEZEL
OPTIONAL GASKET
MADE IN USA
® ®
PANEL
MADE IN USA
DMS-40LCD-4/20S
0.92
(23.4)
0.84
(21.3)
® ®
0.90
(22.9)
2.17
(55.1)
2.09
(53.1)
0.040
(1.02)
0.040
(1.02)
+ –
21
561 23 4
ON
561 23 4
ON
SW1
7
TB1
PS1
R3
Zero
R7
Span
SW2
DP1
S2
(SW3)
DP2
S2
(SW4)
DP3
S2
(SW5)
DP4
S2
(SW6)
FRONT VIEW
BACK VIEW
LOOP INPUT
+ –
0.040
(1.02)
04/29/08