DMS-20LCD-4/20 Series
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4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop 3½ Digit LCD Display Process Monitors The DMS-20LCD-4/20 Series produces the lowest loop voltage-drop of any comparably priced, 4-20mA input, 3½ digit LCD-display process monitors: 1.8V typical, 2.0V max. This super-low drop means its nominal loop resistance (burden) is less than 100 Ohms! All operating power is derived solely from the 4-20mA loop current—no separate power source is required! The simple 2-wire hookup allows the DMS-20LCD-4/20 Series to be connected anywhere in the loop All decimal-point and range-change selections are made via a six-position DIP switch featuring vibration-resistant, gold-plated contacts—there are no jumpers or solder gaps to ever open or close. Both gain (span) and offset (zero) adjustments are performed with precision, 20-turn potentiometers. Three different models are available for unipolar, bipolar, and positive display reading applications. The DMS-20LCD-4/20’s DIP switch and adjustment potentiometers can accommodate literally hundreds of different input-current/ output-reading combinations. And, connections to the current loop are made via a reliable, two-position, screw-type terminal block. The DMS-20LCD-4/20 Series’ subminiature package houses a large, 0.37"/9.4mm high digits, LCD display that can be read in virtually all lighting conditions—including direct sunlight. An optional bezel assembly, featuring screw fasteners and a rubber seal, simplifies panel mounting and provides excellent resistance to environmental dust and moisture. All these outstanding features combine to make the DMS-20LCD-4/20 Series the perfect meters for OEM 4-20mA current-loop process monitoring instrumentation.  Super-low loop drop: 1.8V typical, 2.0V max.  Self-powered, no separate supply required  Unipolar, Bipolar, and Positive Reading Models  Subminiature package—Less than 0.90" behind-thepanel depth  Large, 0.37"/9.4mm 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/readout combinations  Vibration-resistant package; reliable screw-terminal input connections SIMPLIFIED SCHEMATIC DIAGRAM ZERO ADJUST GAIN ADJUST BAND-GAP REFERENCE CIRCUIT For full details go to www.murata-ps.com/rohs DC/DC CONVERTER CURRENT TO VOLTAGE CONVERTER LOOP INPUT

Mu rata Power Solutions DMS-20LCD-4/20 Series 4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop 31V Digit LCD Display Process Monitors Performance/Functional Specifications Typical at Ta = +25°C, unless otherwise noted. © The DMS-20LCD-4/20, using any of the DIP-switch settings described above, can withstand overcurrents, including those resulting from accidental reverse-polarity connections, up to ±40mA without sustaining any damage. © Because Murata Power Solutions' DMS-4/20 loop-powered meters employ active circuitry to convert the loop current into a voltage, the meters' effective...

Mu rata Power Solutions DMS-20LCD-4/20 Series Table 1. DMS-20LCD-4/20S (Unipolar Model) DIP-Switch Settings ® ® 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 # will produce less sensitive offset (R3) and span (R7) adjustments. Please keep in mind that the DMS-20LCD standard meter (from which the DMS-20LCD-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-20LCD-4/20B (Bipolar...

Mu rata Power Solutions DMS-20LCD-4/20 Series ON yyyycy 1 2 3 4 5 6 The first step when configuring the DMS-20LCD-4/20P for the first time, or when selecting a new range, is to set R3 fully counterclockwise and R7 fully clockwise (roughly 22 turns) to their minimum offset/minimum span positions, respectively. The next step is to calculate the required display differential-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...

DMS-20LCD-4/20 Series 4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop 3½ Digit LCD Display Process Monitors PROGRAMMABLE LOGIC CONTROLLER TRANSMITTER & SIGNAL CONDITIONER Shown for illustrative purposes only, may not be present in all applications Figure 2. Typical DMS-20LCD-4/20 Connection Diagram BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT #2-56 INSERT 0.156 (3.96) DEEP BEZEL INSTALLATION FRONT VIEW RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS INTERNAL CORNER RADII: 0.032 (0.81) MAX. RETAINING CLIP INSTALLATION 1.336 (33.93) 1.626 (41.30) 0.093 (2.362) DIAMETER (4...

Mu rata Power Solutions MECHANICAL SPECIFICATIONS 4-20mA Input Loop-Powered Ultra-Low 1.8V Loop Drop 31V Digit LCD Display Process Monitors MECHANICAL DIMENSIONS: TOLERANCES: WIRE SIZE: STRIPPING LENGTH: Back View Zero/Offset DIP Adjust Switches Gain/Span Adjust Loop Input Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes...