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DMS-BZL1 Datasheet(PDF) 2 Page - Murata Power Solutions Inc. |
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DMS-BZL1 Datasheet(HTML) 2 Page - Murata Power Solutions Inc. |
2 / 6 page OPERATING AND SETUP INSTRUCTIONS Performance/Functional Specifications Typical at TA = +25°C, unless otherwise noted. 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 volt- age 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 read- 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. Please keep in mind that the DMS-30LCDA standard meter from which the DMS- 30LCDA-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-30LCDA-4/20S** Unipolar reading, loop-powered LCD meter DMS-30LCDA-4/20B Bipolar reading, loop-powered LCD meter DMS-30LCDA-4/20P Positive reading, loop-powered LCD meter DMS-30LCDA-4/20I Inverse reading, loop-powered LCD meter DMS-BZL1 Bezel assembly DMS-BZL2 Bezel assembly with sealing gasket DMS-30-CP Panel cutout punch DMS-PS4-CM +24V/0.45A ac/dc power supply module DMS-PS7-CM +24V/0.7A ac/dc power supply module ** Replaces obsolete DMS-30LCD-4/20S model A panel-mount retaining clip is supplied with each model. The new DMS-30LCDA-4/20S unipolar-reading model has provisions to accommodate all the display ranges of the obsolete DMS-30LCD- 4/20S. 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 con- figured 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 ‘unipo- lar’ 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. Old Display Reading New DMS-30LCDA-4/20S DIP Switch Setting 4mA 20mA SW1 SW2 SW3 SW4 SW5 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 Use Setting in Table 2 4. ±100 On On On On Off 5. ±200 to ±300 Off Off On Off Off 6. ±400 to ±600 On Off Off Off Off 7. ±700 to ±1900 Off Off Off Off On Table 1. DMS-30LCDA-4/20S DIP Switch Settings for DMS-30LCD-4/20S Applications 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 pro- cedure 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 con- figuring 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”. 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 0 – +60 °C Storage Temperature –20 – +75 °C Humidity (non-condensing) 0 – 85 °C Case Material Polycarbonate Weight 0.75 ounces (21 grams) Ordering Information Important Instructions for Users of Obsolete DMS-30LCD-4/20S Meters DMS-30LCDA-4/20 Series Loop-Powered, 1.8V Drop, 4-20mA Process Monitors with Full-Size LCD Displays MPM_DMS30-LCDA.B02 Page 2 of 6 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com |
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