DMS-30LCDA-4/20 Series www.murata-ps.com 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 ■ Subminiature package; Less than 0.90" behind-the-panel depth ■ Large, 0.40"/10.2mm high, sunlight-viewable LCD display ■ 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, 3½-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. 3 ½ D IG IT A /D C O N V E R T E R R 3 1 R 7 2 3 D A T A 4 5 D P 1 Z E R O A D J U S T D P 2 D P 3 G A IN A D J U S T B A N D -G A P R E F E R E N C E C IR C U IT O N D IP S W IT C H E S 1 + 5 V 2 3 4 5 6 75 8 5 V D C /D C C O N V E R T E R T B 1 C U R R E N T T O V O L T A G E C O N V E R T E R + For full details go to www.murata-ps.com/rohs L O O P IN P U T Figure 1. DMS-30LCDA-4/20 Simplified Schematic www.murata-ps.com/dpm email: [email protected] 19 Jan 2011 MPM_DMS30-LCDA.B05 Page 1 of 6 DMS-30LCDA-4/20 Series Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays Performance/Functional Specifications Typical at TA = +25°C, unless otherwise noted. Current Loop Input Min. Typ. Max. Units Full Scale Input Range +3.8 – +20.4 mA Loop Burden – 80 100 Ohms Voltage Drop – 1.8 2.0 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 – ±0.15 ±0.3 Cnts/°C Display Display Type and Size 3½ digit, 0.4"/10.2mm reflective LCD Polarity Indication "–" for negative readings Overrange Indication "–1_ _ _ " for negative inputs "1_ _ _ " for positive inputs Physical/Environmental Operating Temperature Storage Temperature Humidity (non-condensing) 0 – +60 °C –20 – +75 °C – 85 °C 0 Case Material 0.75 ounces (21 grams) ➀ The DMS-30LCDA-4/20 can withstand continuous overcurrents, including those resulting from accidental reverse-polarity connections, up to ±40mA without sustaining any damage. ➁ 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. ➂ 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. Ordering Information DMS-30LCDA-4/20S-C** DMS-30LCDA-4/20B-C DMS-30LCDA-4/20P-C DMS-30LCDA-4/20I-C DMS-BZL1 DMS-BZL2 DMS-30-CP 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 ** Replaces obsolete DMS-30LCD-4/20S model A panel-mount retaining clip is supplied with each model. -C suffix indicated RoHS compliance. 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 Polycarbonate Weight OPERATING AND SETUP INSTRUCTIONS Old Display Reading 4mA 20mA New DMS-30LCDA-4/20S DIP Switch Setting SW1 SW2 SW3 SW4 1. 000 to 100-300 Use Setting in Table 2 2. 000 to 400-600 Use Setting in Table 2 3. 000 to 700-1999 SW5 Use Setting in Table 2 4. ±100 On On On On 5. ±200 to ±300 Off Off On Off Off Off 6. ±400 to ±600 On Off Off Off Off 7. ±700 to ±1900 Off Off Off Off On 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.” www.murata-ps.com/dpm email: [email protected] 19 Jan 2011 MPM_DMS30-LCDA.B05 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. DMS-30LCDA-4/20B (Standard Unipolar) DIP Switch Settings 20mA 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 DIPswitch’s small actuators are firmly engaged in their fully ON or fully OFF positions. Desired Display Reading 4mA Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays SW1 SW2 SW3 SW4 1. 000 to 1200 to 1999 Off Off Off Off SW5 Off 2. 000 to 600 to 1200 On Off Off Off Off 3. 000 to 400 to 600 Off Off On Off Off 4. 000 to 200 to 400 On On On Off Off 1. Set both R3 and R7 fully clockwise. 5. 000 to 100 to 200 On On On On Off 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.” Examples (DMS-30LCDA-4/20S, Unipolar) O N 1. Desired display readings are: 4mA ="0.00" 20mA = "6.00" 3 4 2 1 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. 5 8 6 7 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.” Table 3. DMS-30LCDA-4/20B (Bipolar) DIP Switch Settings Desired Display Reading O N 2. Desired display readings are: 4mA =" 000" 20mA = "800" 3 2 1 4mA 4 5 6 8 7 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. 4mA = ".000" 12mA = ".250" 1 2 3 4 12mA SW1 SW2 SW3 SW4 600 to 1000 Off Off Off NA NA 2. –350 to –650 000 350 to 650 On Off Off NA NA 3. –250 to –400 000 250 to 400 Off On Off NA NA 4. –150 to –250 000 150 to 250 Off Off On NA NA 5. –100 to –150 000 100 to 150 On On On NA NA O N 1. Desired display readings are: 5 6 7 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.” SW5 Examples (DMS-30LCDA-4/20B, Bipolar ) O N 3. Desired display readings are: 20mA 1. –600 to –1000 000 8 4mA ="–1.00" 20mA = "1.00" 3 2 1 4 5 6 8 7 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. O N 2. Desired display readings are: 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. 4mA =" –450" 20mA = "450" 1 2 3 4 5 6 7 8 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. www.murata-ps.com/dpm email: [email protected] 19 Jan 2011 MPM_DMS30-LCDA.B05 Page 3 of 6 DMS-30LCDA-4/20 Series Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays 3. Desired display readings are: 4mA = "–650" 20mA = "650" ON 1 2 3 4 5 6 7 8 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. 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. 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) 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 display-readings 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 DMS-30LCDA-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. DMS-30LCDA-4/20P (Positive Reading) DIP Switch Settings Desired Display Readings Diff. Range 4mA 20mA SW1 SW2 SW3 SW4 1. 800 to 1400 900 1700 Off Off Off NA SW5* OFF 2. 500 to 800 850 1350 On Off Off NA OFF 3. 350 to 500 800 1150 Off On Off NA OFF 4. 250 to 350 750 1000 Off Off On NA OFF 5. 150 to 250 750 900 On On On NA OFF * 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: ON 4mA ="650" 20mA = "950" 1 2 3 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.” ON 2. Desired display readings are: 4mA =" 4.00" 20mA = "19.99" 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. www.murata-ps.com/dpm email: [email protected] 19 Jan 2011 MPM_DMS30-LCDA.B05 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) Examples (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. 1. Desired display readings are: 20mA = “0.00” 1 2 3 4 5 6 7 8 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.” 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. 2. Desired display readings are: ON 4mA = “800” 20mA = “000” Table 5. DMS-30LCDA-4/20I (Inverse Reading) DIP Switch Settings Desired Display Reading 4mA ON 4mA = “6.00” 20mA SW1 SW2 SW3 SW4 1. 1999 to 1300 000 Off Off Off Off SW5 NA 2. 1300 to 850 000 On Off Off Off NA 3. 850 to 550 000 Off On Off Off NA 4. 550 to 350 000 Off Off On Off NA 5. 350 to 200 000 On On On Off NA 6. 200 to 130 000 On On On On NA 1 2 3 4 5 6 7 8 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 DIP Switches Zero Adjust Front View 1 ON 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) www.murata-ps.com/dpm email: [email protected] 19 Jan 2011 MPM_DMS30-LCDA.B05 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 OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2) #2-56 INSERT 0.156 (3.96) DEEP FRONT VIEW 0.187 (4.75) PANEL ® 1.270 (32.26) ® BEZEL 2.55 (64.77) RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS INTERNAL CORNER RADII: 0.032 (0.81) MAX. 1.07 (27.18) PANEL CUTOUT 0.116 (2.95) RETAINING CLIP INSTALLATION 0.878 (22.30) PANEL 2.118 (53.80) 2.35 (59.69) ISO 9001 and 14001 REGISTERED ® Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. 0.096 (2.44) ® 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY 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. © 2011 Murata Power Solutions, Inc. www.murata-ps.com/locations email: [email protected] 19 Jan 2011 MPM_DMS30-LCDA.B05 Page 6 of 6