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DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays
FEATURES

Super-low loop drop: 1.8V typical, 2.0V max. Self-powered 2-wire operation; no separate supply required Unipolar, Bipolar, Positive, and Inverse Reading Models Improved-performance replacement for DMS-30LCD-4/20S Subminiature package; Less than 0.90" behind-the-panel depth Large, 0.40"/10.2mm high, sunlight-viewable LCD display Available in red, blue or green LED displays Non-interacting gain (span) and offset (zero) 20-turn potentiometers DIP-switch selectable range and decimal points Hundreds of different input-current/readout combinations Vibration-resistant package; reliable screw-terminal input connections

Murata Power Solution's new DMS-30LCDA-4/20 Series' 1.8V nominal loop-drop is the lowest of any comparably priced, 4-20mA input, 31/2-digit process monitors with full-size LCD displays. This super-low loop-drop guarantees a maximum burden of no more than 100 Ohms! And because it's loop-powered, all operating power is derived directly from the loop current itself; no separate power source is required! Their floating 2-wire design allows DMS-30LCDA-4/20 Series process monitors to be connected anywhere in the current loop. All decimal point and range-change selections are made via an eight-position DIP switch which features vibration-resistant, gold-plated contacts--there are no cumbersome jumpers or solder gaps to contend with. Both gain (span) and offset (zero) adjustments are performed using 20-turn, non-interacting potentiometers. Four different models accommodate unipolar, bipolar, positive, and inverse display-reading applications. The DMS-30LCDA-4/20 Series' DIP switch and adjustment potentiometers can accommodate literally hundreds of different input-current/output-reading combinations. DMS-30LCDA-4/20 Series' subminiature package houses a large, 0.40"/10.2mm, highcontrast LCD display that can be read in virtually all lighting conditions--including full sunlight! The two connections to the external loop are made via a reliable screw-type terminal block. For environmentally demanding applications, an optional panel-mount bezel assembly, featuring screw fasteners and a rubber gasket, provides excellent resistance to dust and moisture. All these outstanding features combine to make the new DMS-30LCDA-4/20 Series ideal for all your 4-20mA process-monitoring instrumentation needs.

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Figure 1. DMS-30LCDA-4/20 Simplified Schematic

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MPM_DMS30-LCDA.B02 Page 1 of 6
DMS-30LCDA-4/20 Series
Performance/Functional Specifications
Typical at TA = +25C, unless otherwise noted. Current Loop Input Full Scale Input Range Loop Burden Voltage Drop Overcurrent Protection Performance Sampling Rate Accuracy (1 minute warm-up) Temperature Drift Display Display Type and Size Polarity Indication Overrange Indication Physical/Environmental Operating Temperature Storage Temperature Humidity (non-condensing) Case Material Weight 0 -20 0 - - - +60 +75 85 C C C 31/2 digit, 0.4"/10.2mm reflective LCD "-" for negative readings "-1_ _ _ " for negative inputs "1_ _ _ " for positive inputs - 2.5 reading per second 0.05%FS 1 Count 0.15 0.3 Cnts/C Min. +3.8 - - - Typ. - 80 1.8 - Max. +20.4 100 2.0 40 Units mA Ohms Volts mA
Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays
OPERATING AND SETUP INSTRUCTIONS
Important Instructions for Users of Obsolete DMS-30LCD-4/20S Meters
The new DMS-30LCDA-4/20S unipolar-reading model has provisions to accommodate all the display ranges of the obsolete DMS-30LCD4/20S. The "Old Display Readings" column in Table 1 is taken directly from the DMS-30LCD-4/20S datasheet. Table 1 is provided as a guide for determining equivalent DMS-30LCDA-4/20S DIP-switch settings in upgrading existing applications. Applications that had the obsolete DMS-30LCD-4/20S setup for `bipolar' operation should now use the new DMS-30LCDA-4/20S model configured per Table 1. Bipolar applications are those where a 4mA input displays a negative number, a 12mA input displays "000", and a 20mA input displays a positive number (for example, "-100", "000" and "100"). Applications that had the obsolete DMS-30LCD-4/20S setup for `unipolar' operation should now use the new DMS-30LCDA-4/20S configured per Table 2. Unipolar applications are those where a 4mA input displays "000" and a 20mA input displays a higher positive number.
Table 1. DMS-30LCDA-4/20S DIP Switch Settings for DMS-30LCD-4/20S Applications
Old Display Reading 4mA 20mA 1. 000 to 100-300 2. 000 to 400-600 3. 000 to 700-1999 4. 100 5. 200 to 300 6. 400 to 600 7. 700 to 1900 On Off On Off New DMS-30LCDA-4/20S DIP Switch Setting SW1 SW2 SW3 SW4 SW5 Use Setting in Table 2 Use Setting in Table 2 Use Setting in Table 2 On Off Off Off On On Off Off On Off Off Off Off Off Off On
Polycarbonate 0.75 ounces (21 grams)
The DMS-30LCDA-4/20 can withstand continuous overcurrents, including those resulting from accidental reverse-polarity connections, up to 40mA without sustaining any damage. Because Murata Power Solution's DMS Series loop-powered process monitors employ active circuitry to convert the loop current into a voltage, their effective series impedance (loop burden) varies in a manner that maintains the loop voltage drop relatively constant over the full 4-to-20mA current range. Listed burden specification applies at 20mA. When looking up DIP-switch settings in the Tables and the desired display readings can be achieved with either of two different settings, using the higher setting number will usually result in less sensitive offset (R3) and span (R7) adjustments. Please keep in mind that the DMS-30LCDA standard meter from which the DMS30LCDA-4/20 is derived has an accuracy specification of 2 counts (max.). Thus, it may not always be possible to obtain the exact desired display reading.
DMS-30LCDA-4/20S (Standard Unipolar-Reading) The DMS-30LCDA-4/20S's span and offset circuitry are optimized to display standard, unipolar readings where a 4mA input always reads "000" and a 20mA input always displays a higher positive number. As shipped, the DMS-30LCDA-4/20S is calibrated to read "000" for a 4mA input and "1800" for a 20mA input. These readings are used for factory test-purposes only. The following worst-case calibration procedure assumes the DMS-30LCDA-4/20S is completely misadjusted, i.e., both potentiometers and the DIP switches are randomly set. The next example below, while specifically tailored for the "000" and "1800" readings just noted, can also be used as a guide when configuring the DMS-30LCDA-4/20S for other unipolar display readings. When performing DIP-switch settings, be sure the DIP-switch's small actuators are firmly engaged in their fully ON or fully OFF positions. 1. Set R7 (span/gain adjust) and R3 (zero/offset adjust) fully clockwise, roughly 22 turns, and place SW1-SW8 to OFF. 2. Configure the meter per DIP-switch setting #1 in Table 2. 3. Apply a precision 4mA input with proper polarity and adjust R3 until the meter's display reads "000".
Ordering Information
DMS-30LCDA-4/20S** DMS-30LCDA-4/20B DMS-30LCDA-4/20P DMS-30LCDA-4/20I DMS-BZL1 DMS-BZL2 DMS-30-CP DMS-PS4-CM DMS-PS7-CM Unipolar reading, loop-powered LCD meter Bipolar reading, loop-powered LCD meter Positive reading, loop-powered LCD meter Inverse reading, loop-powered LCD meter Bezel assembly Bezel assembly with sealing gasket Panel cutout punch +24V/0.45A ac/dc power supply module +24V/0.7A ac/dc power supply module
** Replaces obsolete DMS-30LCD-4/20S model A panel-mount retaining clip is supplied with each model.
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MPM_DMS30-LCDA.B02 Page 2 of 6
DMS-30LCDA-4/20 Series
4. Apply a precision 20mA input and adjust R7 until the display reads "1800". Repeat steps 3 and 4 to make sure the adjustments do not affect one another. 5. Select the appropriate decimal point by setting SW6, SW7 or SW8 to ON (DP1, DP2 or DP3 respectively). NOTE: If a display reading other than "000" to "1000" is desired, refer to DIP-Switch Settings Table 2 for SW1-SW5 settings
Table 2.
4mA
Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays
When configuring the DMS-30LCDA-4/20B for the first time, or when selecting a new range, set both R3 and R7 fully clockwise (roughly 22 turns) to their minimum offset/minimum-span positions, respectively. Then select the desired readings from Table 3 and configure DIP-switches SW1, SW2, and SW3 accordingly. Please note, positions SW4 and SW5 are not used in bipolar `B' models. The procedure below illustrates how to calibrate the DMS-30LCDA-4/20B to its factory-calibrated readings of "-1000" with a 4mA input and "1000" with a 20mA input. When performing DIP-switch settings, be sure the DIP-switch's small actuators are firmly engaged in their fully ON or fully OFF positions. 1. Set both R3 and R7 fully clockwise. 2. Select DIP-switch setting #1 from Table 3. 3. Apply a precision 12mA input and adjust R3 until the meter's display reads "000". 4. Apply a precision 20mA input and adjust R7 until the meter's display reads "1000". 5. Apply a precision 4mA input and the display should read "-1000". Repeat steps 3 and 4 to make sure the two adjustments did not affect one another.
DMS-30LCDA-4/20B (Standard Unipolar) DIP Switch Settings
20mA SW1 Off On Off On On SW2 Off Off Off On On SW3 Off Off On On On SW4 Off Off Off Off On SW5 Off Off Off Off Off
Desired Display Reading 1. 000 to 1200 to 1999 2. 000 to 600 to 1200 3. 000 to 400 to 600 4. 000 to 200 to 400 5. 000 to 100 to 200
Examples (DMS-30LCDA-4/20S, Unipolar)
1. Desired display readings are: 4mA ="0.00" 20mA = "6.00"

Table 3. DMS-30LCDA-4/20B (Bipolar) DIP Switch Settings
Desired Display Reading 4mA 12mA 000 000 000 000 20mA 600 to 1000 350 to 650 250 to 400 150 to 250 100 to 150 SW1 Off On Off Off On SW2 Off Off On Off On SW3 Off Off Off On On SW4 NA NA NA NA NA SW5 NA NA NA NA NA
1. -600 to -1000 000 2. -350 to -650 3. -250 to -400 4. -150 to -250 5. -100 to -150
Use DIP-switch setting #3 in Table 2 and enable decimal point DP2 via SW7. Apply 4mA and adjust R3 so the display reads "0.00". Apply 20mA and adjust R7 so the display reads "6.00". 2. Desired display readings are: 4mA =" 000" 20mA = "800"

Use DIP-switch setting #2 in Table 2. Apply 4mA and adjust R3 so the display reads "000". Apply 20mA and adjust R7 so the display reads "800". For these display readings, no decimal points are used. Set SW6, SW7 and SW8 to OFF. 3. Desired display readings are: 4mA = ".000" 12mA = ".250"

Examples (DMS-30LCDA-4/20B, Bipolar )
1. Desired display readings are: 4mA ="-1.00" 20mA = "1.00"

This example is not as straightforward as the previous two. Notice that 12mA is exactly halfway between 4mA and 20mA. If we assume that the input could go up to 20mA, the display reading would then be: 2 x .250 or ".500". From Table 2 we can now select DIP-switch setting #3 and enable DP1 via SW6. Apply 4mA and adjust R3 so the display reads ".000". Apply 12mA and adjust R7 so the display reads ".250".
Use DIP-switch setting #5 in Table 3 and enable decimal point DP2 via SW7. Apply 12mA and adjust R3 so the display reads "0.00". Apply 20mA and adjust R7 so the display reads "1.00". Apply 4mA and verify that the display reads "-1.00", readjust R3 and R7 if necessary. 2. Desired display readings are: 4mA =" -450" 20mA = "450"

DMS-30LCDA-4/20B (Bipolar-Reading )
The DMS-30LCDA-4/20B's zero-offset circuit differs from the unipolar `S' model described above in that with the `B' model, a half-scale 12mA input is typically set to display "000". Therefore, all of the of the DIP-switch settings in Table 3 assume a reading of "000" is desired with a half-scale 12mA input. Display readings other than those shown in Table 3 are possible, contact DATEL for more information.
Use DIP-switch setting #2 in Table 3. Apply 12mA and adjust R3 so the display reads "000". Apply 20mA and adjust R7 so the display reads "450". Apply 4mA and verify that the display reads "-450". Repeat adjustment procedure if necessary. For these display readings, no decimal points are used. Set SW6, SW7and SW8 to OFF.
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MPM_DMS30-LCDA.B02 Page 3 of 6
DMS-30LCDA-4/20 Series
3. Desired display readings are: 4mA = "-650" 20mA = "650"
1 2 3 ON
Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays
5 6 7 8
4
3. Set the transmitter's output to 4.0mA and carefully adjust R3 clockwise until the meter's display reads "000". 4. Set the transmitter's output to 20.0mA and adjust R7 counterclockwise 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 4. DMS-30LCDA-4/20P (Positive Reading) DIP Switch Settings
4mA 900 850 800 750 750 20mA 1700 1350 1150 1000 900 SW1 Off On Off Off On SW2 Off Off On Off On SW3 Off Off Off On On SW4 NA NA NA NA NA SW5* OFF OFF OFF OFF OFF
Notice that these readings can be obtained using either DIP-switch setting #1 or DIP-switch setting #2 in Table 3. In situations like this where DIP-switch settings overlap, less-sensitive R3/R7 adjustments can be achieved if the higher DIP-setting # is selected (setting #2 in this example). Apply 12mA and adjust R3 so the display reads "000". Apply 20mA and adjust R7 so the display reads "650". Apply 4mA and verify that the display reads "-650". Repeat adjustments if necessary.
DMS-30LCDA-4/20P (Positive-Reading)
The DMS-30LCDA-4/20P's zero-offset circuit is optimized to produce positive readings at both 4mA and 20mA input levels. As shown in Table 4's first three columns, a 4mA input can be adjusted (using R3, Zero/Offset Adjust) to display any positive reading between "000" and "800". The corresponding 20mA-input reading is then added to the 4mA offset as a differential whose magnitude is varied by adjusting R7 (Gain/Span Adjust). The `Differential Range' column in Table 4 lists the nominal differential displayreadings which can be obtained with R7 at, or very close to, its full-clockwise, minimum span position. The `Differential Range' column can be used as a guide when configuring the meter for the majority of user applications. Higher differential ranges are obtainable; however, the use of higher differential readings results in correspondingly-lower positive readings with 4mA inputs, that is, R3's clockwise adjustment-range is reduced. Example #3 below illustrates this point. Contact DATEL if there is any doubt as to whether or not the DMS30LCDA-4/20P can be configured for your display-reading requirements. The first step when initially configuring the DMS-30LCDA-4/20P, or when selecting a new range, is to set R3 fully counterclockwise and R7 fully clockwise (roughly 22 turns each) to their minimum offset and minimum span positions, respectively. The next step is to calculate the differential display-reading; this is accomplished by subtracting the desired 4mA display reading from the desired 20mA display reading, disregarding decimal points. Then, using the calculated differential display-reading to select the appropriate DIP-switch setting # from Table 4, configure DIP-switches SW1, SW2, and SW3 accordingly. Please note, positions SW4 and SW5 are not used in positive reading `P' models. Also, make certain that the DIP-switch's small actuators are firmly engaged in their fully ON or fully OFF positions. The example below describes how to calibrate the meter for an application which the DMS-30LCDA-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. 2. Subtract 040 from 200 to yield a differential-reading value of 160; use this value to select DIP-switch setting #5 in Table 4. Enable decimal point DP3 by placing SW8 to the ON position.
Desired Display Readings Diff. Range 1. 800 to 1400 2. 500 to 800 3. 350 to 500 4. 250 to 350 5. 150 to 250
* Setting SW5 to On will increase the differential range. See example 2 below.
Examples (DMS-30LCDA-4/20P, Positive Reading)
1. Desired display readings are: 4mA ="650" 20mA = "950"
1 2 3 ON
4
5
6
7
8
Use DIP-switch setting #4 in Table 4 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. Desired display readings are: 4mA =" 4.00" 20mA = "19.99"
ON
1
2
3
4
5
6
7
8
This example illustrates the DMS-30LCDA-4/20P's capability to display higher differential readings than those indicated in Table 4. This example also illustrates how the DMS-30LCDA-4/20P can be used to display the output levels of a 4-20mA transmitter with higher precision (0.01mA versus 0.1mA) than the example previously described. Subtracting 400 from 1999 yields a differential of 1599, a value not listed in Table 4. However, use DIP-switch setting #1 in Table 4 and enable SW5 since this setting has the highest overall offset/span adjustment capabilities. Enable DP2 via SW7, 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 and check to see that the display reads "19.99" or just overranges ("1--"). Repeat adjustment procedure if necessary.
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MPM_DMS30-LCDA.B02 Page 4 of 6
DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays
DMS-30LCDA-4/20I (Inverse Reading)
The DMS-30LCDA-4/20I is designed to accommodate applications where an increasing loop current produces a decreasing display reading. That is, as the loop current is increased from 4mA to 20mA, the display will read a user determined full-scale positive number at 4mA and then decrease to "000" at 20mA. The `4/20I' model is essentially a `-4/20S' model operating in reverse. Table 5 and the two examples that follow describe the operation of this model in greater detail. The first step when configuring the DMS-30LCDA-4/20I for the first time, or when changing to a different range, is to set both R3 and R7 to their full clockwise positions, roughly 22 turns. Next, using the desired display readings, select the appropriate DIP-switch setting number from Table 5.
Table 5. DMS-30LCDA-4/20I (Inverse Reading) DIP Switch Settings
Desired Display Reading 4mA 1. 1999 to 1300 2. 1300 to 850 3. 850 to 550 4. 550 to 350 5. 350 to 200 6. 200 to 130 20mA 000 000 000 000 000 000 SW1 Off On Off Off On On SW2 Off Off On Off On On SW3 Off Off Off On On On SW4 Off Off Off Off Off On SW5 NA NA NA NA NA NA
Examples (DMS-30LCDA-4/20I, Inverse Reading)
1. Desired display readings are: 4mA = "6.00" 20mA = "0.00"
1 2 3 4 5 6 7 8 ON
Use DIP-switch setting #3 in Table 5 and enable decimal point DP2 via SW7. Apply 20mA and adjust R3 so the display reads "0.00". Apply 4mA and adjust R7 so the display reads "6.00". 2. Desired display readings are: 4mA = "800" 20mA = "000"
1 2 3 4 5 6 7 8 ON
Use DIP-switch setting #2 in Table 5. Apply 20mA and adjust R3 so the display reads "000". Apply 4mA and adjust R7 so the display reads "800". For these display readings, no decimal points are used. Set SW6, SW7 and SW8 to OFF.
Table 6. Decimal Point Selections (All Models)
To turn on a decimal point, place its respective DIP switch to the fully ON position. SW6 DP1 SW7 DP2 SW8 DP3
MECHANICAL SPECIFICATIONS
MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: WIRE SIZE: STRIPPING LENGTH: 2 PL DEC 0.02 (0.51) 3 PL DEC 0.010 (0.254) 18 to 26 AWG (Solid or stranded) 0.20" (5.08mm)

Back View
Zero Adjust DIP Switches
ON
1
R3 Zero Adjust
1
2
3
4
5
6
7
8
TB1
R7 Gain Adjust
+
-
Gain Adjust
+-
Loop Input DP1 (SW6) DP2 (SW7) DP3 (SW8)
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Front View
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MPM_DMS30-LCDA.B02 Page 5 of 6
DMS-30LCDA-4/20 Series
Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays
BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT
BEZEL INSTALLATION
OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2)
#2-56 INSERT 0.156 (3.96) DEEP 0.187 (4.75)
FRONT VIEW
PANEL
MADE IN USA
1.270 (32.26)
2.55 (64.77)
BEZEL
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.116 (2.95)
RETAINING CLIP INSTALLATION
1.07 (27.18)
PANEL CUTOUT
0.878 (22.30)
2.118 (53.80) 2.35 (59.69) 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
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. (c) 2008 Murata Power Solutions, Inc.
11/25/08
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MPM_DMS30-LCDA.B02 Page 6 of 6
(R)
(R)
MADE IN USA
0.096 (2.44)
(R)
(R)
PANEL

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