Laurel Electronics for Digital Panel Meters, Counters, Timers, Transmitters, Digital Displays

Digital Panel Meters - Counters - Timers - DIN Rail Transmitters - Large Digit Displays

   

Price List  |  Distributors  |  Search  |  Inquiry  |  Home

Laureate™ Analog Output Option
Isolated 0-10 V & 0-20 mA analog outputs scaled to the readout
for digital panel meters, counters and remote displays

Analog output option board for Laurel digital panel meters and countersFeatures

  • 0-20 mA or 4-20 mA plus 0-10 Vdc
  • Outputs linearized to reading
  • ±0.025% resolution
  • ±0.05% full scale accuracy
  • Isolation to 250 Vac
  • Scale and offset via front panel or RS-232, RS-485
  • 60 Hz update rate
  • 12 V compliance at 20 mA
  • Output derived from filtered or unfiltered signal input
  • Certified to UL 61010C-1 (UL Mark), EN 61010-1 (CE Mark), and RoHS
CE Mark   UL Mark RoHS Mark

Description

Using a digital panel meter or electronic counter as an isolated 4-20 mA current loop transmitter

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

Electrical
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
Filtered or unfiltered digitized signal
Linearized to display
0-10V, 0-20 mA or 4-20 mA, jumper-selectable
12 V ( 0-600 ohm load )
2 mA ( 5 kOhm min load
250V rms working, 2.3 kV rms per 1 min test
0.05% of full scale (selected output)
< 0.025% of full scale
12 bits (0.025% of full scale)
17 ms (unfiltered DPM)
Gate time + 30 ms + 0-2 periods (counter rate meter)

Scaling
Zero Output
Full Scale Output
Minimum Span

-99,999 to +99,999 (DPM), -999,999 to +999,999 (counter)
-99,999 to +99,999 (DPM), -999,999 to +999,999 (counter)
150 counts

J4 Pin Assignments

Pinout of Laure Electronics Analog Output Board

Application Examples

Driving a Strip-chart Recorder

Driving a recorder using the analog output from a digital panel meter or electronic counter 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

Using a digital panel meter or electronic counter as an isolated 4-20 mA current loop transmitter

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.
  

Price List  |  Distributors  |  Search  |  Inquiry  |  Privacy  |  Home

  
Laurel Electronics, Inc.
Industrial Instrumentation & Displays
3183-G Airway Avenue
Costa Mesa, CA 92626, USA
Tel:      
Fax:
     
(714) 434-6131
(714) 434-3766

  
© 1996-2008 Laurel Electronics, Inc.