Datel DMS-40PC-4/20S-24-I Series Manual - Halaman 2
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Halaman Cetak
DMS-40PC-4/20S
Performance/Functional Specifications
Typical at T
= +25°C, unless otherwise noted.
A
Current Loop Input
Full Scale Input Range (1)
Loop Impedance (2)
Voltage Drop (2)
Overcurrent Protection
Performance
Sampling Rate
Adjustable Accuracy (15 min. warm-up)
Temperature Drift of Span (3)
Temperature Drift of Zero (3)
Power Supply Requirements (4)
DMS-40PC-4/20S-5RS
DMS-40PC-4/20S-5GS
DMS-40PC-4/20S-5RH
DMS-40PC-4/20S-5RL
DMS-40PC-4/20S-24RL
I
DMS-40PC-4/20S-24XX-
Models
Display
Display Type and Size
Polarity Indication
Overrange Indication
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (Non-condensing)
Case Material
Weight
Order on-line at www.datel.com
Ordering Information
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 LED's
DMS-40PC-4/20S-24RH-I
+24V isolated supply, high-intensity
red LED's
DMS-40PC-4/20S-24GS-I
+24V isolated supply, standard-intensity
green LED's
DMS-PS4-CM
+24V/0.45A AC/DC power supply module
DMS-PS7-CM
+24V/0.7A AC/DC power supply module
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 model.
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · E-mail: [email protected] · Internet: www.datel.com
4 ½ D I G I T , 4 - 2 0 m A I N P U T , L E D D I S P L A Y M E T E R S
Min.
Typ.
Max.
Units
+3.7
—
+20.4
mA
12
—
103
Ohms
—
—
2.1
Volts
—
—
±40
mA
2.5 readings per second
To ±0.01% of full scale ±2 counts
—
±0.3
±0.6
Cnts/°C
—
±0.2
±0.5
Cnts/°C
+4.75 to +5.25Vdc at 140mA max.
+4.75 to +5.25Vdc at 140mA max.
+4.75 to +5.25Vdc at 140mA max.
+4.75 to +5.25Vdc at 50mA max.
+7.5 to +32Vdc at 50mA max.
+21.6 to +26.4Vdc at 60mA max.
4½ digit LED, 0.52"/13.2mm high
"-" for negative readings
Flashing "0000"
0
—
+50
°C
–40
—
+75
°C
0
—
95
%
Polycarbonate
1 ounce (28grams)
Technical Notes
(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 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-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
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 tempera-
ture 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.
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