dms-40pc-4/20s 4? digit, 4-20ma input, led display meters www.murata-ps.com technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 mpm_dms-40pc-420.d01 page 1 of 6 the dms-40pc-4/20s series' superior design makes them ideal for use in demanding 4-20ma process monitoring applications requiring a full 4? digits (0-19999) of display resolution. their full-size, 0.52" (13.2mm) high, led displays can be read in virtually any lighting condition and are available in green, high-intensity red, or low-power red. two operating power supply ranges are available: a wide-input +7.5 to 32v model for use with popular +12vdc and +24vdc industrial supplies, and +4.75 to 5.25v models for use with +5v logic supplies. the reverse-polarity protected +7.5-32v red led model consumes only 30ma from a +24v sup - ply, but still provides excellent display brightness. the dms-40pc-4/20's input, span, and offset circuits all employ super- stable, 0.5% thin-flm chip resistors. long-term stability and accuracy are assured by driving these tight-tolerance resistors with an ultra-stable, 0.2% bandgap voltage reference. and, unlike many competing designs, the two precision 20-turn span and zero adjust potentiometers do not interact with one another. all range-change and decimal point selections are made by confguring two gold-plated, vibration-resistant, six-position dip switches. to further en - hance reliability, both power supply and current loop connections are made via reliable screw-type terminal blocks. all these outstanding features make the dms-40pc-4/20s series meters the most rugged 4? digit led display process monitors available. features full-size, 0.52" (13.2mm) high, led digits +7.5- 32vdc model draws 30ma +24v isolated-power models dip-switch selectable range, offset, and decimal points non-interacting, 20-turn, gain (span) and offset (zero) adjustments insensitive to ground loops 103 ohm max. loop burden vibration-resistant package; reliable screw-terminal connections hundreds of different input/readout combinations miniature size: 2.17" x 0.92" x 1.02" (55mm x 23mm x 26mm) figure 1. dms-40pc-4/20s simplifed schematic ? -v is not connected to meter ground on -i suffx models. data 4? digit a/d converter band-gap reference circuit dp3 dp2 dp1 zero adjust gain adjust current to voltage converter +5v ? + dp4 r3 r7 range offset gain sg9 s1 s2 on on 1 1 1 2 3 4 5 6 2 3 4 5 6 on on 1 1 1 2 3 4 5 6 2 3 4 5 6 +v tb2 ?v ? + 1 2 voltage converter +5v 1 1 2 tb1 4-20ma current loop power power supply input for full details go to www.murata-ps.com/rohs $
dms-40pc-4/20s 4? digit, 4-20ma input, led display meters technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com mpm_dms-40pc-420.d01 page 2 of 6 technical notes performance/functional specifcations typical at t a = +25c, unless otherwise noted. (1) full scale input: the dip switch settings display readings in table 1 can typically be obtained with transmitters having a low-level output of 3.7 to 4.3ma and a full-scale output of 19.4 to 20.4ma. when using transmitters whose outputs fall outside these ranges, try using the next highest dip switch setting if the desired reading is too low, or the next lowest setting if the desired display reading is too high. example number 2 illustrates this point. please keep in mind that the dms-40pc meter from which the dms- 40pc-4/20s is derived has an accuracy specifcation of 3 counts (max.); thus, it may not always be possible to obtain the exact desired display readings. a change of 1 count is defned as the right-hand most digit (the"ones" led) going up or down by one. other display readings not shown in table 1 are obtainable. for example, some negative readings with a 4ma input are possible. consult datel for more information regarding display readings not shown in the table. (2) loop impedance/drop: the maximum loop impedance and the maximum loop voltage-drop are both specifed with dip switch setting #20 enabled. the maximum loop voltage drop is specifed with a 20.0ma input current. (3) temperature drift: temperature drift of zero and temperature drift of gain are both specifed with the meter confgured for range #20 with 4ma adjusted (using r3) to read "0000" 1 count, and 20ma adjusted (using r7) to read "19000" 2 counts. the temperature drift of gain is proportional to the full scale range being used. it is typically less pronounced at the lower range settings, that is, if the observed gain drift of a particular meter is +12 counts when reading "19000" on range #20 at 40c, the same meter will most likely have a drift of only +6 counts when reading "9000" on range #12 at 40c. the normally very accurate autozeroing feature of the dms-40pc- 4/20s's internal analog-to-digital converter (a/d) is not a factor in determining the meter's zero-reading stability over temperature due to the fact that an offset voltage is applied to the a/d's lo input. this offset voltage is used to null the voltage developed with a 4ma input. to function properly, the autozeroing feature found in most digital panel meters requires both a/d inputs to remain at zero volts with varying temperature. the meter's zero-reading stability over its specifed operating temperature is affected by the drift of three terms: the voltage developed by the meter's offset circuitry; the voltage developed across the meter's input resistor(s) with a 4ma input; and the stability of the applied 4ma input signal itself. in the lower dip switch settings ( ranges #1-4), the meter's parasitic etch and switch interconnect resistances also contribute a small error. the meter's performance with regards to span stability over tem - perature is affected by the drift of the meter's gain circuitry and the drift of the input resistor(s). to counter these drifts in applications requiring the utmost in temperature stability, where possible, the meter should be calibrated at its anticipated operating temperature. for these applications, use of the dms-40pc-4/20s-5rl model is highly recommended because of its inherently lower power consumption and self-heating. dms-40pc-4/20s-5rs +5v supply, standard-intensity red led's dms-40pc-4/20s-5gs +5v supply, standard-intensity green led's dms-40pc-4/20s-5rl +5v supply, low-power red led's dms-40pc-4/20s-5rh +5v supply, high-intensity red led's dms-40pc-4/20s-24rl +7.5v to +32v supply, low-power red led's dms-40pc-4/20s-24rs- i +24v isolated supply, standard-intensity red leds dms-40pc-4/20s-24rh- i +24v isolated supply, high-intensity red leds dms-40pc-4/20s-24gs- i +24v isolated supply, standard-intensity green leds dms-bzl1 panel-mount bezel assembly dms-bzl2 panel-mount bezel assembly with sealing gasket dms-30-cp panel cutout punch a panel-mount retaining clip is supplied with each meter. current loop input min. typ. max. units full scale input range (1) +3.7 C +20.4 ma loop burden (2) 12 C 103 ohms voltage drop (2) C C 2.1 volts overcurrent protection C C 40 ma performance sampling rate 2.5 reading per second accuracy (1 minute warm-up) to 0.01%fs 2 count temperature drift of span (3) C 0.3 0.6 cnts/c temperature drift of zero (3) C 0.2 0.5 cnts/c power supply requirements (4) dms-40pc-4/20s-5rs +4.75 to +5.25vdc at 140ma max. dms-40pc-4/20s-5gs +4.75 to +5.25vdc at 140ma max. dms-40pc-4/20s-5rh +4.75 to +5.25vdc at 140ma max. dms-40pc-4/20s-rl +4.75 to +5.25vdc at 50ma max. dms-40pc-4/20s-24rl +7.5 to +32vdc at 50ma max. dms-40pc-4/20s-24xx-i (models) +21.6 to +26.4vdc at 60ma max. display display type and size 4? digit, 0.52"/13.2mm high led polarity indication "C" for negative readings overrange indication "C 1_ _ _ " for negative inputs "1_ _ _ " for positive inputs physical/environmental operating temperature 0 C +50 c storage temperature C40 C +75 c humidity (non-condensing) 0 C 95 c case material polycarbonate weight 0.1 ounces (28 grams) ordering information
dms-40pc-4/20s 4? digit, 4-20ma input, led display meters technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com mpm_dms-40pc-420.d01 page 3 of 6 operating and setup instructions the following procedure must be performed as the frst re-calibration step every time dip switches s1 and s2 are changed to select a new display range. the following procedure also assumes the dms-40pc-4/20s is initially completely mis-adjusted, i.e., both potentiometers and both dip switches s1 and s2 are randomly set. when performing switch settings, make sure that the dip switch's small actuator is pushed up as far as it will go to ensure that the switch is truly set to the on (closed) position. 1. set r7 (gain/span adjust) and r3 (zero/offset adjust) fully clockwise, roughly 20 turns, then using the settings found in the selected range, place the dip switches on s1 and s2 to the appropriate positions for the desired display reading. 2. apply a precision 4ma input with proper polarity and adjust r3 (top 20-turn potentiometer) until the meter's display reads "0000". 3. apply a precision 20ma input and adjust r7 (bottom 20-turn potentiometer) until the display reads the maximum desired reading. repeat steps 2 and 3 to make sure the adjustments did not affect one another. table 1. dip-switch settings using the decimal point settings table as a guide, the dms-40pc- 4/20s's decimal points can be enabled to suit the user's particular readout requirements. place the selected decimal point's dip switch to the on po - sition (up) to illuminate the decimal point. the decimal points are merely placeholders, that is, they can all be illuminated or all turned off; they have no affect on the meter's operation and/or display readings. switch s2 sw3 sw4 sw5 sw6 dp1 dp2 dp3 dp4 table 2. decimal point settings switch s1 switch s2 display reading sw1 sw2 sw3 sw4 sw5 sw6 sw1 sw2 4ma 20ma 1. 0000 2250-2500 off on on on off off on on 2. 0000 2500-2800 off on on on off off off on 3. 0000 2800-3200 off on on on off off on off 4. 0000 3200-3850 off on on on off off off off 5. 0000 3850-4300 on off on on off off on on 6. 0000 4300-4900 on off on on off off off on 7. 0000 4900-5600 on off on on off off on off 8. 0000 5600-6200 on off on on off off off off 9. 0000 6200-6800 off off on on on off on on 10. 0000 6800-7750 off off on on on off off on 11. 0000 7750-8600 on on off on on off on on 12. 0000 8600-9850 on on off on on off off on 13. 0000 9850-11000 on on on off off on on on 14. 0000 11000-12000 on on on off off on off on 15. 0000 12000-13000 on off off on off on on on 16. 0000 13000-14000 on off off on off on off on 17. 0000 14000-15300 on off on off on on on on 18. 0000 15300-16300 on off on off on on off on 19. 0000 16300-17800 off off on off on on on on 20. 0000 17800-20000 off off on off on on off on since the dms-40pc-4/20s uses extremely-stable thin-flm chip resis - tors, periodic re-calibration is typically required only in environmentally demanding applications where shock, vibration and temperature extremes may have a detrimental affect on the 20-turn potentiometers. (4) input grounding : except for the -i suffx models which feature isolated current loop inputs, all other dms-40pc-4/20s meters are supplied with their 4-20ma negative-input terminals (tb1-2, -) inter - nally connected to their power supply ground terminal (tb2-2, -v). this single-ended input confguration is compatible with most grounded-referenced 4-20ma transmitters. applications in which the dms-40pc-4/20s and its associated 4-20ma transmitter are connected to a common ground and the transmitter drives two or more loads (for example, the meter is in series with a plc) must have the meter connected as the frst device in the current loop, that is, closest to the system ground (see figure 2). if this connection scheme is not possible and/or the meter must be connected in the middle of the current loop, then-i suffx models must be used to provide the required isolation between the meters current loop input and the power supply ground (-v). see figures 2, 3, 4, and 5 for typical loop connections.
dms-40pc-4/20s 4? digit, 4-20ma input, led display meters technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com mpm_dms-40pc-420.d01 page 4 of 6 connection diagrams 4. if necessary, select the appropriate decimal point by setting either sw3, sw4, sw5, or sw6 of s2 to on (dp1, dp2, dp3, or dp4, respectively, as shown in table 2). note: please keep in mind that the transmitter's 4ma and 20ma output accuracy may affect display readings which are at, or very close to, the high and low extremes of the selected range. see example #2 below and technical note 1 for more information. examples the examples below illustrate how to confgure the meter to perform some typical measurements. remember to frst set r3 and r7 to their full clockwise position before calibrating the meter. 1. desired display readings are: 4ma = "0.000" 20ma = "3.000" use dip-switch setting #3 and enable decimal point dp2 by placing sw4 of switch s2 to on. apply 4ma and adjust r3 so the display reads "0.000". apply 20ma and adjust r7 so the display reads "3.000". 2. desired display readings are: 4ma = "0000" 20ma = "8600" use dip-switch setting #11. apply 4ma and adjust r3 so the display reads "0000". apply 20ma and adjust r7 so the display reads "8600". if the transmitter's full-scale output is less than 20.0ma, it may not be pos - sible to adjust r7 for a reading of "8600" with setting #11. if this occurs, select setting #12 and re-calibrate both r3 and r7 to obtain "0000" and "8600". note that for these display readings no decimal points are used. set sw3, sw4, sw5 and sw6 on switch s2 to off. 3. desired display readings are: 4ma = "0000" 20ma = "10000" use dip-switch setting #13. apply 4ma and adjust r3 so the display reads "0000". apply 20ma and adjust r7 so the display reads "10000". for these display readings no decimal points are used. set sw3, sw4, sw5 and sw6 on switch s2 to off. 4. desired display readings are: 4ma = ".0000" 12ma = ".2500" this example is not as straightforward as the previous three. notice that 12ma is exactly halfway between 4ma and 20ma. if we assume the input could go up to 20ma, the display reading would then be 2 x .2500 or ".5000". from the table, we can select dip-switch setting #7 and enable dp1 via sw3 of switch s2. apply 4ma and adjust r3 so the display reads ".0000". apply 12ma and adjust r7 so the display reads ".2500". figure 2. typical connections for single-ended transmitters driving single-ended +24v powered meters. on on 1 1 1 2 3 4 5 6 2 3 4 5 6 1 1 1 2 2 on on 1 1 1 2 3 4 5 6 2 3 4 5 6 1 1 1 2 2 s1 s2 on on 1 1 1 2 3 4 5 6 2 3 4 5 6 1 1 1 2 2 s1 s2 s1 s2 on on 1 1 1 2 3 4 5 6 2 3 4 5 6 1 1 1 2 2 s1 s2 dms-40pc-4/20s-24rl + +v 24v ground single-ended transmitter ? +24v 4-20ma (tb1-2) (tb1-1) (tb2-1) ?v (tb2-2) + + ?
dms-40pc-4/20s 4? digit, 4-20ma input, led display meters technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com mpm_dms-40pc-420.d01 page 5 of 6 figure 5. typical connections for +5v powered meters. note that 5v ground and 24v ground are tied together inside the meter. figure 4. typical connections for isolated-supply meters in series with an auxiliary device. figure 3. typical connections for loop-powered transmitters driving single-ended meters. dms-40pc-4/20s-24rl + +v 24v ground loop-powered transmitter + +24v 4-20ma n.c. (tb1-1) (tb2-1) ?v (tb2-2) ? (tb1-2) ? dms-40pc-4/20s-24rl + +v 5v ground loop transmitter + + +24v 4-20ma (tb1-1) (tb2-1) ?v (tb2-2) ? (tb1-2) 24v ground +5v ?
dms-40pc-4/20s 4? digit, 4-20ma input, led display meters murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. specifcations are subject to change without notice. ? 2008 murata power solutions, inc. usa: mansfeld (ma), tel: (508) 339-3000 , email: sales@murata-ps.com canada: toronto, tel: (866) 740 1232, email: toronto@murata-ps.com uk: milton keynes, tel: +44 (0)1908 615232, email: mk@murata-ps.com france: montigny le bretonneux, tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com germany: mnchen, tel: +49 (0)89-544334-0, email: munich@murata-ps.com japan: tokyo, tel: 3-3779-1031, email: sales_tokyo@murata-ps.com osaka, tel: 6-6354-2025, e mail: sales_osaka@murata-ps.com website: www.murata-ps.jp china: shanghai, tel: +86 215 027 3678, email: shanghai@murata-ps.com guangzhou, tel: +86 208 221 8066, email: guangzhou@murata-ps.com murata power solutions, inc. 11 cabot boulevard, mansfeld, ma 0204 8 -1151 u.s.a. tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com iso 9001 registered technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com mpm_dms-40pc-420.d01 page 6 of 6 + C loop input dp2 s2 (sw4) dp3 s2 (sw5) dp1 s2 (sw3) back view front view + C power input dp4 s2 (sw6) mechanical dimensions: inches (mm) tolerances: 2 pl dec 0.02 (0.51) 3 pl dec 0.010 (0.254) wire size: 18 to 26 awg (solid or stranded) stripping length: 0.20" (5.08mm) #2-56 insert 0.156 (3.96) deep front view 1.270 (32.26) 0.187 (4.75) optional bezel (dms-bzl1 and dms-bzl2) 2.35 (59.69) 2.118 (53.80) 0.093 (2.362) diameter (4 required) only when using optional bezel assembly recommended drill and panel cutout dimensions internal corner radii: 0.032 (0.81) max. 1.07 (27.18) 0.878 (22.30) 0.096 (2.44) 0.116 (2.95) 2.55 (64.77) panel cutout made in usa ? ? retaining clip installation panel a panel-mount retaining clip is supplied with all models. made in usa dms-40pc-4/20s 0.92 (23.37) 0.84 (21.34) ? ? 0.040 (1.02) 1.02 (25.9) 2.17 (55.12) 2.09 (53.09) 0.04 (1.02) 1.33 (33.8) 1 1 depth dimension for the dms-40pc-4/20s-24rl model only. u2 is not used on 5v-powered models. + 2 1 + 2 1 5 6 1 2 3 4 on 5 6 1 2 3 4 on s1 7 r7 tb1 s2 ps1 sg9 tb2 u2 r3 zero r7 span u2 u2 made in usa ? ? bezel installation panel bezel optional gasket
|
