Murata DMS-40PC-4/20S-24RH-I 4â½ digit, 4-20ma input, led display meter Datasheet

DMS-40PC-4/20S
4½ Digit, 4-20mA Input, LED Display Meters
FEATURES
N
Full-size, 0.52" (13.2mm) high, LED digits
N
+7.5- 32Vdc model draws 30mA
N
+24V Isolated-power models
N
Dip-switch selectable range, offset, and decimal points
N
Non-interacting, 20-turn, gain (span) and offset
(zero) adjustments
N
Insensitive to ground loops
N
103 Ohm max. loop burden
N
Vibration-resistant package; reliable screw-terminal
connections
N
Hundreds of different input/readout combinations
N
Miniature size: 2.17" x 0.92" x 1.02"
(55mm x 23mm x 26mm)
The DMS-40PC-4/20S Series' superior design makes them ideal for use
in demanding 4-20mA process monitoring applications requiring a full 4½
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 supply, but still provides excellent display brightness.
The DMS-40PC-4/20's input, span, and offset circuits all employ superstable, ±0.5% thin-film 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 configuring
two gold-plated, 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 these outstanding features make
the DMS-40PC-4/20S Series meters the most rugged 4½ digit LED display
process monitors available.
4½ DIGIT A/D
CONVERTER
Range
R3
Offset
Gain
DATA
R7
ZERO
ADJUST
DP1
DP2
DP3
DP4
GAIN
ADJUST
BAND-GAP
REFERENCE
CIRCUIT
ON
ON
S1
+5V
S2
1
2
3
4
5
6
1
2
3
4
6
5
VOLTAGE
CONVERTER
SG9
+5V
CURRENT TO
VOLTAGE
CONVERTER
1
TB1
~ -V is not connected to meter
ground on ‘-I’ suffix models.
1
+
2
–
4-20mA
CURRENT LOOP POWER
For full details go to
www.murata-ps.com/rohs
TB2
1
2
+
–
+V
–V
POWER
SUPPLY INPUT
Figure 1. DMS-40PC-4/20S Simplified Schematic
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-40PC-420.D02 Page 1 of 6
DMS-40PC-4/20S
4½ Digit, 4-20mA Input, LED Display Meters
TECHNICAL NOTES
Performance/Functional Specifications
Typical at TA = +25°C, unless otherwise noted.
Current Loop Input
Min.
Full Scale Input Range (1)
Typ.
Max.
Units
+3.7
–
+20.4
mA
Loop Burden (2)
12
–
103
Ohms
Voltage Drop (2)
–
–
2.1
Volts
Overcurrent Protection
–
–
±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)
–
±0.3
±0.6
Cnts/°C
Temperature Drift of Zero (3)
–
±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
4½ digit, 0.52"/13.2mm high LED
Polarity Indication
"–" for negative readings
Overrange Indication
"–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
Physical/Environmental
Operating Temperature
0
Storage Temperature
Humidity (non-condensing)
Case Material
–
+50
°C
–40
–
+75
°C
0
–
95
°C
Polycarbonate
Weight
0.1 ounces (28 grams)
Ordering Information
DMS-40PC-4/20S-5RS
DMS-40PC-4/20S-5GS
DMS-40PC-4/20S-5RL
DMS-40PC-4/20S-5RH
DMS-40PC-4/20S-24RL
DMS-40PC-4/20S-24RS-I
DMS-40PC-4/20S-24RH-I
DMS-40PC-4/20S-24GS-I
DMS-BZL1
DMS-BZL2
DMS-30-CP
+5V supply, standard-intensity red LED's
+5V supply, standard-intensity green LED's
+5V supply, low-power red LED's
+5V supply, high-intensity red LED's
+7.5V to +32V supply, low-power red LED's
+24V isolated supply, standard-intensity
red LED’s
+24V isolated supply, high-intensity
red LED’s
+24V isolated supply, standard-intensity
green LED’s
Panel-mount bezel assembly
Panel-mount bezel assembly with
sealing gasket
Panel cutout punch
A panel-mount retaining clip is supplied with each meter.
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(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 DMS40PC-4/20S is derived has an accuracy specification of ±3 counts
(max.); thus, it may not always be possible to obtain the exact desired
display readings. A change of ±1 count is defined 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 specified with DIP switch setting
#20 enabled. The maximum loop voltage drop is specified with a
20.0mA input current.
(3) Temperature Drift: Temperature drift of zero and temperature drift of
gain are both specified with the meter configured 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 40°C, the same meter will
most likely have a drift of only +6 counts when reading "9000" on
range #12 at 40°C.
The normally very accurate autozeroing feature of the DMS-40PC4/20S'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
specified 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 temperature 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.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-40PC-420.D02 Page 2 of 6
DMS-40PC-4/20S
4½ Digit, 4-20mA Input, LED Display Meters
Table 1. DIP-Switch Settings
Switch S1
Display Reading
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
4mA
20mA
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
2250-2500
2500-2800
2800-3200
3200-3850
3850-4300
4300-4900
4900-5600
5600-6200
6200-6800
6800-7750
7750-8600
8600-9850
9850-11000
11000-12000
12000-13000
13000-14000
14000-15300
15300-16300
16300-17800
17800-20000
Switch S2
SW1
SW2
SW3
SW4
SW5
SW6
SW1
SW2
Off
Off
Off
Off
On
On
On
On
Off
Off
On
On
On
On
On
On
On
On
Off
Off
On
On
On
On
Off
Off
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
On
On
Off
Off
On
On
Off
Off
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Off
Off
On
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
On
Since the DMS-40PC-4/20S uses extremely-stable thin-film chip resistors, 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” suffix 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, “-”) internally connected to their power supply ground terminal (TB2-2,
“-V”). This single-ended input configuration 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 first 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’ suffix models must
be used to provide the required isolation between the meter’s current
loop input and the power supply ground (“-V”). See Figures 2, 3, 4,
and 5 for typical loop connections.
Off
Off
On
On
Off
Off
On
On
On
On
On
On
On
On
On
On
On
On
Using the Decimal Point Settings Table as a guide, the DMS-40PC4/20S'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 position (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.
OPERATING AND SETUP INSTRUCTIONS
The following procedure must be performed as the first 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".
Table 2. Decimal Point Settings
Switch S2
SW3
SW4
SW5
SW6
DP1
DP2
DP3
DP4
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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.
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-40PC-420.D02 Page 3 of 6
DMS-40PC-4/20S
4½ Digit, 4-20mA Input, LED Display Meters
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).
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 possible 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.
S1
S2
3. Desired display readings are:
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.
ON ON
4mA = "0000"
20mA = "10000"
Examples
The examples below illustrate how to configure the meter to perform
some typical measurements. Remember to first set R3 and R7 to their full
clockwise position before calibrating the meter.
S1
S2
1. Desired display readings are:
ON
2
3
4
6
5
1
2
3
4
5
6
1
2
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.
S1
S2
4. Desired display readings are:
4mA = "0.000"
20mA = "3.000"
1
1
2
ON ON
4mA = ".0000"
12mA = ".2500"
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".
S1
2. Desired display readings are:
S2
1
2
3
4
6
5
1
2
3
4
5
6
1
2
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".
ON ON
4mA = "0000"
20mA = "8600"
1
2
CONNECTION DIAGRAMS
+24V
+
+V (TB2-1)
+
(TB1-1)
+
(TB1-2)
–
DMS-40PC-4/20S-24RL
4-20mA
SINGLE-ENDED
TRANSMITTER
–
24V GROUND
–V (TB2-2)
Figure 2. Typical Connections for Single-Ended Transmitters Driving
Single-Ended +24V Powered Meters.
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-40PC-420.D02 Page 4 of 6
DMS-40PC-4/20S
4½ Digit, 4-20mA Input, LED Display Meters
+24V
+
+V (TB2-1)
(TB1-1)
LOOP-POWERED
TRANSMITTER
–
+
DMS-40PC-4/20S-24RL
4-20mA
N.C.
(TB1-2)
–
–V (TB2-2)
24V GROUND
Figure 3. Typical Connections for Loop-Powered Transmitters Driving Single-Ended Meters.
Figure 4. Typical Connections for Isolated-Supply Meters in Series with an Auxiliary Device.
+24V
+5V
+
+V (TB2-1)
+
(TB1-1)
+
(TB1-2)
–
DMS-40PC-4/20S-24RL
4-20mA
LOOP
TRANSMITTER
–
24V GROUND
–V (TB2-2)
5V GROUND
Figure 5. Typical Connections for +5V Powered Meters. Note that 5V Ground and 24V Ground are Tied Together Inside the Meter.
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-40PC-420.D02 Page 5 of 6
DMS-40PC-4/20S
4½ Digit, 4-20mA Input, LED Display Meters
MECHANICAL DIMENSIONS: Inches (mm)
U2
2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
18 to 26 AWG
(Solid or stranded)
0.20" (5.08mm)
STRIPPING LENGTH:
1.33
(33.8)
1
1.02
(25.9)
0.040
(1.02)
®
WIRE SIZE:
U2
DMS-40PC-4/20S
TOLERANCES:
MADE IN USA
®
2.09
(53.09)
0.04
(1.02)
0.84
(21.34)
2.17
(55.12)
0.92
(23.37)
1 Depth dimension for the DMS-40PC-4/20S-24RL model only.
U2 is not used on 5V-powered models.
Front View
ON
1
2
3
S2
ON
5
4
R3
Zero
6
1
2
3
PS1
Back View
S1
5
4
6
TB2
TB1
+
–
+
–
1
2
1
2
R7
SG9
U2
7
R7
Span
+ – + –
Loop Input
FRONT VIEW
DP1
S2
(SW3)
Power Input
#2-56 INSERT
0.156 (3.96) DEEP
DP2
S2
(SW4)
DP3
S2
(SW5)
DP4
S2
(SW6)
BEZEL INSTALLATION
0.187
(4.75)
PANEL
1.270
(32.26)
®
®
MADE IN USA
OPTIONAL
GASKET
2.55 (64.77)
BEZEL
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
1.07
(27.18)
PANEL CUTOUT
0.116
(2.95)
RETAINING CLIP INSTALLATION
0.878
(22.30)
PANEL
2.118 (53.80)
®
MADE IN USA
0.096
(2.44)
®
2.35 (59.69)
0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
A panel-mount retaining clip is supplied with all models.
USA:
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: [email protected] ISO 9001 and 14001 REGISTERED
11/25/08
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. Specifications are subject to change without
notice.
© 2008 Murata Power Solutions, Inc.
www.murata-ps.com
Mansfield (MA), Tel: (508) 339-3000, email: [email protected]
Canada:
Toronto, Tel: (866) 740-1232, email: [email protected]
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany:
München, Tel: +49 (0)89-544334-0, email: [email protected]
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
Singapore:
Parkway Centre, Tel: +65 6348 9096, email: [email protected]
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-40PC-420.D02 Page 6 of 6
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