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 Laureate™ Analog Output Option
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Features
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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 0.025% resolution and ±0.05% full scale accuracy (1 LSB). The update rate for meters is a fast 56/s at 60 Hz power or 47/s at 50 Hz power, as determined by the meter. 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 selected output selected output is calibrated to ±0.05% accuracy, while the non-selected output is only accurate to ±2%. Isolation is provided by a separate on-board power supply, which is powered by the meter. This supply can drive 20 mA of 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. |
Specifications
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| Power Source Signal Source Output Linearization Output Levels Compliance, 0-20 mA Compliance, 0-10 V Isolation Accuracy Output Nonlinearity Output Resolution Output Update Rate |
Provided
by meter |
| Scaling | |
| Zero Output Full Scale Output Minimum Span |
-99,999
to +99,999 (DPM), -999,999 to +999,999 (counter) |
| 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 or 0-10V transmitters. The output is linearized to the reading, a major benefit with thermocouple or 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 where required. |
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Resource Pages |
