DMR20-0-5 MURATA-PS | Alldatasheet
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www.murata-ps.com/support MPM_DMR20-0/5.A01 Page 1 of 5
FEATURES
High-quality, 20-turn, span (gain) and zero (offset) SIMPLIFIED SCHEMATIC DIAGRAM For full details go to: http://www.murata-ps.com/en/support/rohs- compliance.html Murata Power Solutions’ new DMR20 -0/5 Series are the world's first 0-5V input process monitors designed to fi t industry standard, 1.21 inch [ 30.7 mm ] round panel cutouts. Their large, easy -to-read, 0.30 inch [7.6 mm] digits are available in a choice of red 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 36V dc power. Gain (span) and offset (zero) adjustments are performed with on -board, precision, 20-turn potentiometers. All decimal -point and range-change selections are made on a 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 entire assembly utilizes 100% soldered connections. Bo th power -supply and input - signal connections are made via a reliable, 3-position, screw-type terminal block. 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, long-lead-time, factory "customs" 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 w ater submersion to 3 feet (1 meter). Provides scaling of 0-5V and 0-10V process signals Operates from industrial 5V / 12V / 24V / 36V dc power supplies Fits round 1.21 inch [30.7 mm] cutouts; less than 1.00 inch [25.4 mm] behind-the-panel depth High input impedance, 100k Ω minimum Easy-to-read, 0.30 inch [7.6 mm] high red or green LED display Supplied with EPDM rubber gasket and hex nut High-quality, 20-turn, span (gain) and zero (offset) adjustments Gold-plated DIP-switches for range and decimal points: Reliable screw-terminal input connections Rugged, polycarbonate housing, one-piece package Protected against dust and water submersion to IP67/NEMA 6 Figure 1 Simplified Schematic Diagram DMR20-0/5 Series 0-5V Input, 3½ Digit LED Display Round Process Monitors
www.murata-ps.com/support MPM_DMR20-0/5.A01 Page 2 of 5 DMR20-0/5 Series 0-5V and 0-10V Input 3½ Digit, LED Display Process Control Monitors Performance/Functional Specifications Typical at TA = +25°C, unless otherwise noted. ➀ The DMR20-0/5 can also be used in most 0-10V applications. See the section on 0-10V inputs for more information. ➁ INPUT LO (TB1-2) shares a common connection with power ground (also TB1–2). Overvoltage specifications apply to the INPUT HI (TB1-1) connection referenced to TB1-2. Ordering Information* DMR20-0/5-R-C +5 to +50Vdc V Supply, Red LED’s DMR20-0/5-G-C +5 to +50Vdc V Supply, Green LED’s Note: An M30 x 1.5 nylon metric hex nut and EPDM sealing gasket are supplied with each meter. The “-C” suffix indicates RoHS compliance TECHNICAL NOTES 1. Input Configuration: The DMR20-0/5 has its signal input LO terminal connected to its power supply ground terminal (TB1-2). This connection effectively places the meter's input in a single-ended configuration, that is, signal ground is connected directly to power ground. In some applications, single-ended inputs may cause ground- loop induced errors (the meter's display becomes unstable). Applications which require electrical isolation between the input signal ground and the system power supply ground must use a separate transformer-isolated supply to power the meter. 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 metric nut and gasket, see the Mechanical Specifications section for more information. OPERATING AND SETUP INSTRUCTIONS As shipped, the DMR20-0/5 is factory calibrated to read "000" for a 0.0 V input and "1900" for a 5.0 V input. The following worst-case procedure assumes the DMR20-0/5 is completely miss-adjusted, i.e., both potentiometers and the DIP switches are randomly set. 1. Set R7 (full scale span/gain adjust) fully counterclockwise, and R3 (zero/offset adjust) fully clockwise, roughly 22 turns, and place SW3- SW6 to OFF (down position). 2. Select DIP switch setting #1 in Table 1. 3. Apply a precision 0.0 V input and adjust R3 until the meter's display reads "000.” 4. Apply a precision 5.0 V input and adjust R7 until the meter's display reads "1900.” Repeat steps 3 and 4 to make sure the adjustments do not affect one another. 5. Select the appropriate decimal point by setting SW and SW2 per Table NOTE: The "000" to "1900" display readings referred to in the instructions above are for instructional purposes only. If other display readings are desired, refer to DIP-Switch Settings Tables 1 and 2 for SW3-SW6 settings. The initial setting of R3 fully clockwise and R7 fully counterclockwise is recommended in the adjustment procedure for all the following examples. Input MMin. Typ. Max. Units Full Scale Input Range ➀ 4.9 5.0 5.1 Volts Input Impedance 100 – 140 K Ω Overvoltage Protection ➁ – – ±40 Volts Performance Sampling Rate 2.5 reading per second Accuracy (1 minute warm-up): ±0.05% FS ±1 Count Temperature Drift (0 to +60°C) – ±0.15 ±0.3 Counts/°C Power Supply Requirements 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 Display Display Type and Size 3½ digit, 0.30" [7.6 mm] high LED Polarity Indication "–" for negative VIN Overrange Indication "–1_ _ _" for negative inputs "1_ _ _" for positive inputs Physical/Environmental Operating Temperature 0 – +60 °C Storage Temperature –20 – +75 °C Humidity (non-condensing) 0 – 85 % Case Material Polycarbonate Weight 0.65 ounces (18.5 grams) Panel Knockout Tools: DMR20-1-KP 1.22” [30.9 mm] punch (no keying notch) DMR20-2-KP 1.21” [30.7 mm] punch with 4 keying notches DMR20-3-KP Keyway Punch tool *See www.murata.com/products/power for model-specific availability.
5.0 V input = "800"
used, so set SW1 and SW2 both to ON.
5.0 V input = ”250"
6.0 V input = ”090"
Table 1. Apply 1.0 V and adjust R3 so the display reads “090’. With sure the potentiometer settings did not affect one another. 0/5 is used with 0-10V inputs.
- Desired display readings are:
0.0 V input = "000"
10.0 V input = "500"
be accommodated as indicated in Table 2.
www.murata-ps.com/support MPM_DMR20-0/5.A01 Page 5 of 5 DMR20-0/5 Series 0-5V Input, 3 ½ Digit LED Display Round Process Monitors MECHANICAL SPECIFICATIONS AND RECOMMENDED PANEL CUTOUT 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 no representation that the use of its products in the circuits described herein, or the us e of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions cont ained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to c hange without notice. © 2015 Murata Power Solutions, Inc. http://www.murata-ps.com/en/3d/meters.html Available Panel Knockout Tools: DMR20-1-KP 1.22” [30.9 mm] punch (no keying notch) DMR20-2-KP 1.21” [30.7 mm] punch with 4 keying notches DMR20-3-KP Keyway Punch tool TB1 Recommended Wire Terminations: WIRE SIZE: 18 to 26 AWG (Solid or stranded) STRIPPING LENGTH: 0.20” [5.1 mm] Nominal