DMS-40PC-4/20S www.murata-ps.com 4 Digit, 4-20mA Input, LED Display Meters The DMS-40PC-4/20S Series superior design makes them ideal for use in demand- FEATURES ing 4-20mA process monitoring applications requiring a full 4 digits (0-19999) of display Full-size, 0.52 (13.2mm) high, LED digits resolution. Their full-size, 0.52 (13.2mm) high, LED displays can be read in virtually any +7.5-32Vdc model draws 30mA lighting condition and are available in green, high-intensity red, or low-power red. +24V Isolated-power models 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 Dip-switch selectable range, offset, and decimal points for use with +5V logic supplies. The reverse-polarity protected +7.5-32V red LED model Non-interacting, 20-turn, gain (span) and offset consumes only 30mA from a +24V supply, but still provides excellent display brightness. (zero) adjustments The DMS-40PC-4/20 s input, span, and offset circuits all employ super-stable, 0.5% Insensitive to ground loops thin- lm 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 103 Ohm max. loop burden many competing designs, the two precision 20-turn span and zero adjust potentiometers Vibration-resistant package reliable screw-terminal do not interact with one another. connections All range-change and decimal point selections are made by con guring two gold-plat- Hundreds of different input/readout combinations ed, vibration-resistant, six-position DIP switches. To further enhance reliability, both power supply and current loop connections are made via reliable screw-type terminal blocks. All Miniature size: 2.17 x 0.92 x 1.02 these outstanding features make the DMS-40PC-4/20S Series meters the most rugged 4 (55mm x 23mm x 26mm) digit LED display process monitors available. 4 DIGIT A/D CONVERTER Range Offset Gain DATA R3 R7 DP1 DP2 DP3 DP4 ZERO GAIN ADJUST ADJUST BAND-GAP REFERENCE CIRCUIT ONON ON ON +5V S1 S2 111 22 33 44 55 66 111 22 33 44 5 6 5 6 VOLTAGE CONVERTER SG9 CURRENT TO +5V VOLTAGE CONVERTER TB1 TB2 1 2 1 2 + + -V is not connected to meter +V V ground on -I suf x models. 4-20mA POWER CURRENT LOOP POWER SUPPLY INPUT For full details go to www.murata-ps.com/rohs Figure 1. DMS-40PC-4/20S Simpli ed Schematic www.murata-ps.com/support MPM DMS-40PC-420.E01 Page 1 of 6DMS-40PC-4/20S 4 Digit, 4-20mA Input, LED Display Meters TECHNICAL NOTES Performance/Functional Speci cations Typical at TA = +25C, unless otherwise noted. (1) Full Scale Input: The DIP Switch settings display readings in Table 1 Current Loop Input Min. Typ. Max. Units can typically be obtained with transmitters having a low-level output Full Scale Input Range (1) +3.7 +20.4 mA 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 Loop Burden (2) 12 103 Ohms the next highest DIP switch setting if the desired reading is too low, Voltage Drop (2) 2.1 Volts or the next lowest setting if the desired display reading is too high. Overcurrent Protection 40 mA Example number 2 illustrates this point. Performance Please keep in mind that the DMS-40PC meter from which the Sampling Rate 2.5 reading per second DMS-40PC-4/20S is derived has an accuracy speci cation of 3 Accuracy (1 minute warm-up) To 0.01%FS 2 Count counts (max.) thus, it may not always be possible to obtain the exact Temperature Drift of Span (3) 0.3 0.6 Cnts/C desired display readings. A change of 1 count is de ned as the right-hand most digit (thone LED) going up or down by one. Temperature Drift of Zero (3) 0.2 0.5 Cnts/C Power Supply Requirements (4) Other display readings not shown in Table 1 are obtainable. For example, some negative readings with a 4mA input are possible. DMS-40PC-4/20S-5RS +4.75 to +5.25Vdc at 140mA max. Consult Murata Power Solutions for more information regarding DMS-40PC-4/20S-5GS +4.75 to +5.25Vdc at 140mA max. display readings not shown in the table. DMS-40PC-4/20S-5RH +4.75 to +5.25Vdc at 140mA max. (2) Loop Impedance/Drop: The maximum loop impedance and the DMS-40PC-4/20S-RL +4.75 to +5.25Vdc at 50mA max. maximum loop voltage-drop are both speci ed with DIP switch set- DMS-40PC-4/20S-24RL +7.5 to +32Vdc at 50mA max. ting 20 enabled. The maximum loop voltage drop is speci ed with a DMS-40PC-4/20S-24XX-I (models) +21.6 to +26.4Vdc at 60mA max. 20.0mA input current. Display (3) Temperature Drift: Temperature drift of zero and temperature drift Display Type and Size 4 digit, 0.52 /13.2mm high LED of gain are both speci ed with the meter con gured for range 20 Polarity Indication for negative readings with 4mA adjusted (using R3) to read0000 1 count, and 20mA adjusted (using R7) to read19000 2 counts. Overrange Indication1 for negative inputs1 for positive inputs The temperature drift of gain is proportional to the full scale range Physical/Environmental being used. It is typically less pronounced at the lower range set- tings, that is, if the observed gain drift of a particular meter is +12 Operating Temperature 0 +50 C counts when reading19000 on range 20 at 40C, the same Storage Temperature 40 +75 C meter will most likely have a drift of only +6 counts when reading Humidity (non-condensing) 0 95 C9000 on range 12 at 40C. Case Material Polycarbonate The normally very accurate autozeroing feature of the DMS-40PC- Weight 0.1 ounces (28 grams) 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 Ordering Information input. To function properly, the autozeroing feature found in most DMS-40PC-4/20S-5RS-C +5V supply, standard-intensity red LEDs digital panel meters requires both A/D inputs to remain at zero volts with varying temperature. The meter s zero-reading stability over DMS-40PC-4/20S-5GS-C +5V supply, standard-intensity green LEDs its speci ed operating temperature is affected by the drift of three DMS-40PC-4/20S-5RL-C +5V supply, low-power red LEDs terms: the voltage developed by the meter s offset circuitry the volt- DMS-40PC-4/20S-5RH-C +5V supply, high-intensity red LEDs age developed across the meter s input resistor(s) with a 4mA input DMS-40PC-4/20S-24RL-C +7.5V to +32V supply, low-power red LEDs and the stability of the applied 4mA input signal itself. In the lower DMS-40PC-4/20S-24RS-I-C +24V isolated supply, standard-intensity red LEDs DIP switch settings ( ranges 1-4), the meter s parasitic etch and switch interconnect resistances also contribute a small error. DMS-40PC-4/20S-24RH-I-C +24V isolated supply, high-intensity red LEDs The meter s performance with regards to span stability over tem- DMS-40PC-4/20S-24GS-I-C +24V isolated supply, standard-intensity green LEDs perature is affected by the drift of the meter s gain circuitry and the DMS-BZL1-C Panel-mount bezel assembly drift of the input resistor(s). To counter these drifts in applications DMS-BZL2-C Panel-mount bezel assembly with sealing gasket requiring the utmost in temperature stability, where possible, the DMS-30-CP Panel cutout punch meter should be calibrated at its anticipated operating temperature. For these applications, use of the DMS-40PC-4/20S-5RL model is See www.murata-ps.com/dpm-availability for model-speci c availability. highly recommended because of its inherently lower power con- sumption and self-heating. A panel-mount retaining clip is supplied with each meter. www.murata-ps.com/support MPM DMS-40PC-420.E01 Page 2 of 6