www.murata-ps.com DMS-30LCDA-4/20 Series Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays Murata Power Solutions new DMS-30LCDA-4/20 Series 1.8V nominal loop-drop is the FEATURES lowest of any comparably priced, 4-20mA input, 3-digit process monitors with full-size Super-low loop drop: 1.8V typical, 2.0V max. LCD displays. This super-low loop-drop guarantees a maximum burden of no more than Self-powered 2-wire operation no separate 100 Ohms And because its loop-powered, all operating power is derived directly from the supply required loop current itself no separate power source is required Their oating 2-wire design allows DMS-30LCDA-4/20 Series process monitors to be connected anywhere in the current loop. Unipolar, Bipolar, Positive, and Inverse Reading Models All decimal point and range-change selections are made via an eight-position DIP switch Subminiature package Less than 0.90 which features vibration-resistant, gold-plated contactsthere are no cumbersome jumpers behind-the-panel depth or solder gaps to contend with. Both gain (span) and offset (zero) adjustments are performed Large, 0.40 /10.2mm high, sunlight-viewable LCD display using 20-turn, non-interacting potentiometers. Four different models accommodate unipolar, Non-interacting gain (span) and offset (zero) bipolar, positive, and inverse display-reading applications. The DMS-30LCDA-4/20 Series 20-turn potentiometers DIP switch and adjustment potentiometers can accommodate literally hundreds of different input-current/output-reading combinations. DIP-switch selectable range and decimal points DMS-30LCDA-4/20 Series subminiature package houses a large, 0.40/10.2mm, high- Hundreds of different input-current/readout combinations contrast LCD display that can be read in virtually all lighting conditionsincluding full sunlight Vibration-resistant package reliable The two connections to the external loop are made via a reliable screw-type terminal block. For screw-terminal input connections 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. For full details go to www.murata-ps.com/rohs Figure 1. DMS-30LCDA-4/20 Simpli ed Schematic www.murata-ps.com/support MPM DMS30-LCDA.C01 Page 1 of 6 See www.murata-ps.com/dpm-availability for model-speci c availability. DMS-30LCDA-4/20 Series Loop-Powered, 1.8V Drop, 4-20mA Process Performance/Functional Speci cations Monitors with Full-Size LCD Displays Typical at TA = +25C, unless otherwise noted. Current Loop Input Min. Typ. Max. Units OPERATING AND SETUP INSTRUCTIONS Full Scale Input Range +3.8 +20.4 mA Loop Burden 80 100 Ohms Important Instructions for Users of Obsolete Voltage Drop 1.8 2.0 Volts DMS-30LCD-4/20S Meters Overcurrent Protection 40 mA The new DMS-30LCDA-4/20S unipolar-reading model has provisions Performance to accommodate all the display ranges of the obsolete DMS-30LCD- Sampling Rate 2.5 reading per second 4/20S. The Old Display Readings column in Table 1 is taken directly Accuracy (1 minute warm-up) 0.05%FS 1 Count 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 Temperature Drift 0.15 0.3 Cnts/C upgrading existing applications. Display Applications that had the obsolete DMS-30LCD-4/20S setup for bipolar Display Type and Size 3 digit, 0.4 /10.2mm re ective LCD operation should now use the new DMS-30LCDA-4/20S model con- Polarity Indication for negative readings gured per Table 1. Bipolar applications are those where a 4mA input Overrange Indication1 for negative inputs displays a negative number, a 12mA input displays 000, and a 20mA 1 for positive inputs input displays a positive number (for example, -100, 000 and 100). Physical/Environmental Applications that had the obsolete DMS-30LCD-4/20S setup for unipo- Operating Temperature 0 +60 C lar operation should now use the new DMS-30LCDA-4/20S con gured Storage Temperature 20 +75 C per Table 2. Unipolar applications are those where a 4mA input displays 000 and a 20mA input displays a higher positive number. Humidity (non-condensing) 0 85 C Table 1. DMS-30LCDA-4/20S DIP Switch Settings for Case Material Polycarbonate DMS-30LCD-4/20S Applications Weight 0.75 ounces (21 grams) Old Display Reading New DMS-30LCDA-4/20S DIP Switch Setting 4mA 20mA SW1 SW2 SW3 SW4 SW5 The DMS-30LCDA-4/20 can withstand continuous overcurrents, including those 1. 000 to 100-300 Use Setting in Table 2 resulting from accidental reverse-polarity connections, up to 40mA without 2. 000 to 400-600 Use Setting in Table 2 sustaining any damage. 3. 000 to 700-1999 Use Setting in Table 2 Because Murata Power Solutions DMS Series loop-powered process monitors 4. 100 On On On On Off employ active circuitry to convert the loop current into a voltage, their effective 5. 200 to 300 Off Off On Off Off series impedance (loop burden) varies in a manner that maintains the loop volt- 6. 400 to 600 On Off Off Off Off age drop relatively constant over the full 4-to-20mA current range. Listed burden 7. 700 to 1900 Off Off Off Off On speci cation applies at 20mA. When looking up DIP-switch settings in the Tables and the desired display read- DMS-30LCDA-4/20S (Standard Unipolar-Reading) ings 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. The DMS-30LCDA-4/20Ss span and offset circuitry are optimized to Please keep in mind that the DMS-30LCDA standard meter from which the DMS- display standard, unipolar readings where a 4mA input always reads 30LCDA-4/20 is derived has an accuracy speci cation of 2 counts (max.). Thus, 000 and a 20mA input always displays a higher positive number. it may not always be possible to obtain the exact desired display reading. 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 pro- Ordering Information cedure assumes the DMS-30LCDA-4/20S is completely misadjusted, DMS-30LCDA-4/20S-C** Unipolar reading, loop-powered LCD meter i.e., both potentiometers and the DIP switches are randomly set. DMS-30LCDA-4/20B-C Bipolar reading, loop-powered LCD meter The next example below, while speci cally tailored for the 000 and DMS-30LCDA-4/20P-C Positive reading, loop-powered LCD meter 1800 readings just noted, can also be used as a guide when con- DMS-30LCDA-4/20I-C Inverse reading, loop-powered LCD meter guring the DMS-30LCDA-4/20S for other unipolar display readings. DMS-BZL1-C Bezel assembly DMS-BZL2-C Bezel assembly with sealing gasket When performing DIP-switch settings, be sure the DIP-switchs small DMS-30-CP Panel cutout punch actuators are rmly engaged in their fully ON or fully OFF positions. ** Replaces obsolete DMS-30LCD-4/20S model 1. Set R7 (span/gain adjust) and R3 (zero/offset adjust) fully clockwise, A panel-mount retaining clip is supplied with each model. roughly 22 turns, and place SW1-SW8 to OFF. -C suf x indicated RoHS compliance. 2. Con gure the meter per DIP-switch setting 1 in Table 2. See www.murata-ps.com/dpm-availability for model-speci c availability. 3. Apply a precision 4mA input with proper polarity and adjust R3 until the meters display reads 000. www.murata-ps.com/support MPM DMS30-LCDA.C01 Page 2 of 6