DMR20-0/5 Series 0-5V Input, 3 Digit LED Display Round Process Monitors FEATURES Murata Power Solutions new DMR20-0/5 Series are the world s first 0-5V input process monitors designed to fit industry standard, 1.21 inch 30.7 mm round panel Provides scaling of 0-5V and 0-10V process signals c utouts. Their large, easy-to-read, 0.30 inch 7.6 mm digits are available in a choice of High-quality, 20-turn, span (gain) and zero (offset) Operates from industrial 5V / 12V / 24V / 36V dc power supplies r ed or green LED displays. For the ultimate versatility in industrial applications, these new process monitors can be operated from any regulated source of 5V, 12V, 24V, or Fits round 1.21 inch 30.7 mm cutouts less than 1.00 inch 25.4 36V dc power. mm behind-the-panel depth High input impedance, 100k minimum Gain (span) and offset (zero) adjustments are performed with on-board, precision, Easy-to-read, 0.30 inch 7.6 mm high red or green LED display 20-turn potentiometers. All decimal-point and range-change selections are made on a Supplied with EPDM rubber gasket and hex nut 6-position, vibration-resistant, gold-plated DIP switch. Unlike competitive meters, there are no jumpers or solder gaps to open or close. To further enhance reliability, the High-quality, 20-turn, span (gain) and zero (offset) adjustments entire assembly utilizes 100% soldered connections. Both power-supply and input- Gold-plated DIP-switches for range and decimal points: Reliable signal connections are made via a reliable, 3-position, screw-type terminal block. screw-terminal input connections Rug ged, polycarbonate housing, one-piece package The DMR20-0/5 s DIP switch and potentiometers accommodate hundreds of input- voltage / output-reading combinations. This practically eliminates the need for more costly, Protected against dust and water submersion to IP67/NEMA 6 long-lead-time, factorycustom in applications which use several different-range meters. An EPDM rubber gasket and hex nut simplify installation and provide IP67 / NEMA 6 protection to environmental dirt and moisture, including water submersion to 3 feet (1 meter) SIMPLIFIED SCHEMATIC DIAGRAM Figure 1 Simplified Schematic Diagram For full details go to: DMR20-0/5 Series 0-5V and 0-10V Input 3 Digit, LED Display Process Control Monitors Performance/Functional Specifications Typical at TA = +25C, unless otherwise noted. TECHNICAL NOTES Input MMin. Typ. Max. Units 4.9 5.0 5.1 Volts Full Scale Input Range Input Impedance 100 140 K 1. Input Conguration: The DMR20-0/5 has its signal input LO terminal connected to its power supply ground terminal (TB1-2). This Overvoltage Protection 40 Volts connection effectively places the meter s input in a single-ended Performance conguration, that is, signal ground is connected directly to power Sampling Rate 2.5 reading per second ground. In some applications, single-ended inputs may cause ground- Accuracy (1 minute warm-up): 0.05% FS 1 Count loop induced errors (the meter s display becomes unstable). Temperature Drift (0 to +60C) 0.15 0.3 Counts/C Applications which require electrical isolation between the input Power Supply Requirements signal ground and the system power supply ground must use a separate transformer-isolated supply to power the meter. DMR20-0/5-R-C (7.5 mA max.) +5.0 +40.0 Volts DMR20-0/5-G -C (10 mA max.) +5.0 +40.0 Volts 2. Panel Mounting: In most standard through-the-panel installations, the DMR20-0/5 must be secured to the panel with the supplied M30 x 1.5 Display metric nut and gasket, see the Mechanical Specications section for Display Type and Size 3 digit, 0.30 7.6 mm high LED more information. Polarity Indication for negative VIN Overrange Indication 1 for negative inputs1 for positive inputs OPERATING AND SETUP INSTRUCTIONS Physical/Environmental Operating Temperature 0 +60 C Storage Temperature 20 +75 C As shipped, the DMR20-0/5 is factory calibrated to read000 for a 0.0 V Humidity (non-condensing) 0 85 % input and1900 for a 5.0 V input. The following worst-case procedure Case Material Polycarbonate assumes the DMR20-0/5 is completely miss-adjusted, i.e., both potentiometers and the DIP switches are randomly set. Weight 0.65 ounces (18.5 grams) 1. Set R7 (full scale span/gain adjust) fully counterclockwise, and R3 (zero/offset adjust) fully clockwise, roughly 22 turns, and place SW3- The DMR20-0/5 can also be used in most 0-10V applications. See the section on 0-10V inputs for more information. SW6 to OFF (down position). 2. Select DIP switch setting 1 in Table 1. INPUT LO (TB1-2) shares a common connection with power ground (also TB12). Overvoltage specications apply to the INPUT HI (TB1-1) connection referenced 3. Apply a precision 0.0 V input and adjust R3 until the meter s display to TB1-2. reads000. 4. Apply a precision 5.0 V input and adjust R7 until the meter s display reads1900. Repeat steps 3 and 4 to make sure the adjustments do not affect one another. Ordering Information 5. Select the appropriate decimal point by setting SW and SW2 per Table DMR20-0/5-R-C +5 to +50Vdc V Supply, Red LEDs 3. DMR20-0/5-G-C +5 to +50Vdc V Supply, Green LEDs NOTE: The000 to1900 display readings referred to in the instructions above are for instructional purposes only. If other display Note: An M30 x 1.5 nylon metric hex nut and EPDM sealing gasket are readings are desired, refer to DIP-Switch Settings Tables 1 and 2 for supplied with each meter. The -C suffix indicates RoHS compliance SW3-SW6 settings. The initial setting of R3 fully clockwise and R7 Panel Knockout Tools: fully counterclockwise is recommended in the adjustment procedure DMR20-1-KP 1.22 30.9 mm punch (no keying notch) for all the following examples. DMR20-2-KP 1.21 30.7 mm punch with 4 keying notches DMR20-3-KP Keyway Punch tool www.murata-ps.com/support MPM DMR20-0/5.A01 Page 2 of 5