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Laurel Electronics
provides digital panel meters / controllers, totalizers, counters,
loop-powered meters, temperature meters, for all types of
transducers or process indication & control. |
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Laureate™
Analog Output Option
Isolated
0-10 V & 0-20 mA scaled to displayed value
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Features |
0-20
mA or 4-20 mA plus 0-10 Vdc. |
0.025%
resolution. |
Isolation
to 250 Vac. |
Outputs
linearized to reading. |
Scale
and offset via RS-232, RS-485, or front panel. |
56/s
update rate at 60 Hz power, 47/s at 50 Hz power. |
12
V compliance at 20 mA. |
Output
derived from filtered or unfiltered signal input. |
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| Description |
| The
Laureate analog output option board provides an isolated
0-10 Vdc voltage signal to drive a chart recorder, plus
an isolated 0-20 mA or 4-20 mA current signal for transmission
to a computer or central control room. This option is
compatible with all Laureate meters and counters, and
turns these into highly accurate, sourcing, 4-wire transmitters.
The output for thermocouples, RTDs and custom curves
is linearized to the displayed reading.
A 12-bit D-to-A converter provides .025% resolution.
The update rate is a fast 56/s at 60 Hz power or 47/s
at 50 Hz power. The analog output can track the unfiltered
signal for fastest response, or the digitally filtered
signal for best noise rejection
Scaling of the output is easily entered via front panel
pushbuttons or via the serial digital interface. The
displayed readings to produce the low and high analog
outputs may be set to any value from -99,999 to +99,999
for DPMs, or -999,999 to +999,999 for counters.
Both the current (0-20 mA or 4-20 mA) or voltage ( 0-10
V) outputs are available at the same time, and the same
scaling applies to both. The output selected in software
is calibrated to 99.9% accuracy. The non-selected output
is accurate to 98%.
Isolation is provided by a separate on-board power supply,
which is powered by the meter. This supply can drive
20 mA current into loads up to 600 ohms, for 12 V compliance.
Isolation to signal ground and power ground eliminates
problems caused by ground loops.
The addition of the analog output option turns Laureate
temperature meters into superb, isolated, linearized,
4-20 mA temperature transmitters with exceptional accuracy
and high-speed response. |
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| Specifications |
| Electrical |
Power
Source |
Provided
by meter |
Output
Linearization |
Linearized
to display |
Signal
Source |
Filtered
or unfiltered digitized signal |
Output
Levels |
(
0-20 mA or 4-20 mA ) and 0-10 Vdc |
Compliance,
0-20 mA |
12
V ( 0-600 ohm load ) |
Compliance,
0-10 V |
2
mA ( 5 kOhm min load |
Isolation |
Safety-rated
to 250 Vac, 4.2 kVp per High Voltage Test |
Accuracy
|
99.9%
selected output, 98% non-selected output
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Output
Nonlinearity
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<0.05%
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Output
Resolution |
12-bit
( .025% of FS )
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Output
Update Rate
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56/s
at 60 Hz power, 47/s at 50 Hz power |
Response
Time
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17
ms (unfiltered DPM)
Gate time + 30 ms + 0-2 periods (counter) |
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Scaling |
Zero
Output
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-99,999
to +99,999 (DPM), -999,999 to +999,999 (counter)
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Full
Scale Output
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-99,999
to +99,999 (DPM), -999,999 to +999,999 (counter)
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Minimum
Span |
150
counts |
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J4
Pin Assignments |
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| Application
Examples |
| Driving
a Strip-chart Recorder |
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The
0-10 V output capability of the analog output board
is ideal to drive a strip chart recorder. As for 4-20
mA, the 0-10 V output can be scaled to the meter reading
to highlight signal level changes in a range of interest. |
| Use
as an Isolated, Linearized 4-20 mA Transmitter |
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0-20
mA output capability turns Laureate meters and counters
into high-accuracy, high-speed, isolated 4-20 mA transmitters.
The output is linearized to the reading, a major benefit
with thermocouple and RTD inputs
The 4-20 mA signal can be transmitted via twisted pair
wires to a control room for supervisory process monitoring
and control. Process meters in series with the signal
can provide local readouts in engineering units where
required. |
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FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
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