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

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Laureate™ Process, Strain &
Potentiometer Follower Meter

Digital panel meter / controllers with scalable readout & control outputs
for process, strain, pressure, level, flow, 4-20 mA signals & more.

Laurel Digital Panel Meter for Process, Strain, and Potentiometer Follower Applications
CE Mark   UL Mark RoHS Mark

Features

  • 0.2, 2, 20, 200 and 300V ranges.
  • 2, 20, 200 mA and 5A ranges.
  • All ranges factory calibrated.
  • 4 1/2 to 5 digit resolution.
  • Scalable via front panel pushbuttons or computer for display in engineering units.
  • Span adjust from 0 to ±99,999
  • Zero adjust from -99,999 to +99,999
  • Peak value display and auto-tare.
  • Up to 60 conversions per second.
  • Selectable fixed right-hand zero with rounding.
  • 5, 10 or 24 Vdc transducer excitation supply.
  • Ratiometric compensation for variations in excitation voltage.
  • External controls for reset, meter hold, decimal points, and tare.
  • NEMA 4X, 1/8 DIN case.
  • Dual relay option.
  • Analog output option.
  • Serial communication options.
  • Low voltage AC & DC power.
  • Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS.

Description

Laurel Digital Panel Meter for Process and Strain Signals

Laureate™ digital process and strain panel meters are a cost-effective solution to a wide variety of monitoring and control applications which require a scalable readout from strain gauges or from process signals such as 4-20 mA, 0-5 V or 0-10 V. They are also ideal for use in potentiometer follower applications, where the transducer output is a changing resistance.

Scalable to Five Full Digits

The display may be scaled to five full digits from -99,999 to +99,999 from the front panel to read directly in engineering units, such as PSI. Three scaling methods are selectable: scale and offset, two-point method, and system-level calibration using actual transducer signals. All ranges are precalibrated at the factory, so that recalibration is not needed when changing ranges or signal conditioners.

With the Laureate process meter, strain gauges with a 20 mV output can be scaled to display up to 10,000 counts, while outputs of 200 mV can be scaled to 99,999 counts. With the Laureate load cell meter, strain gauges with a 20 mV output can be scaled to the full 99,999 counts.

Isolated Excitation Supply

Signal conditioner for Laureate digital panel meter for process, strain, and potentiometer follower applications5, 10, and 24 Vdc isolated excitation outputs are standard to power strain gauge bridges and 4-20 mA transmitters, eliminating the need for an external supply. When powering strain gauges or potentiometers, the 5 or 10 Vdc excitation is monitored by the meter to eliminate errors caused by excitation voltage variations.

Fast Read Rate and Signal Filtering

The displayed readings and the data outputs can be separately selected to be either unfiltered or filtered.

  • An unfiltered selection updates after each conversion for fastest response, up to 60/sec, while integrating the input signal over a full power cycle. Fast read rate provides true peak readings and aids in control applications.
  • A batch-average filter selection averages each 16 conversions for an update every 1/4 sec.
  • An adaptive moving average filter selection provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, the filter adapts by briefly switching to the shortest time to follow the change, then reverts back to its selected time constant. Another choice is Auto, which provides an automatic time constant selection based on the signal noise characteristics.

Advanced Meter Features

  • Auto-tare allows the display to be zeroed for any input signal. This is normally achieved by applying a switch closure or logic signal at the rear connector. The tare value is stored in non-volatile memory and is retained when power is removed.
  • Peak value of the input signal is automatically captured and may be displayed via a front panel pushbutton command or control signal at the rear connector. Other controls via the rear connector include meter hold, meter reset, peak reset, and decimal point selection.
Interface Options
Plug-in isolated analog output, dual setpoint controller, and RS-232/485 communications boards can upgrade the Laureate from a simple monitor to system interface and control.

Rate & Custom Curve Fit Options

An Extended Laureate computer board can display rate based on successive readings. It also allows exceptionally accurate custom curve linearization, for example to read out liquid volume or rate of flow in a horizontal cylindrical tank based on level reported by a 4-20 mA transmitter. For setup, up to 180 data points can be input into a computer spreadsheet or text file by the user. The computer then calculates spline-fit segments, which are downloaded into the meter via RS-232.

Built-in Flexibility & Safety

Laureates may be powered from 95-240 Vac ±10% or optionally from 12-30 Vac or 10-48 Vdc. They are available with red or green LEDs. They are housed in a 1/8 DIN case that meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys may be locked out for simplified usage and security.

Specifications

DC Voltage
  
DC Voltage Range Resolution Input
Ohms
Error at 25°C
±2 counts
±200.00 mV
2.000 V
20.000 V
200.00 V
  600.0 V *
300.0 V
10 µV
100 µV
1 mV
10 mV
100 mV
100 mV
1 G
1 G
10 M
10 M
10 M
10 M
0.01% FS
0.01% FS
0.01% FS
0.01% FS
0.02% FS
0.02% FS

DC Current

DC Current Range Resolution Input
Ohms
Error at 25°C
±2 counts
2.0000 mA
20.000 mA
200.00 mA
5.000 A
0.1 µA
1.0 µA
10 µA
1.0 mA
100
10
1
0.01
0.01% FS
0.01% FS
0.01% FS
0.04% FS

DC Voltage & Current

Display
Readout
Range
Indicators
5 LED digits, 7-segment, 14.2 mm (.56"), red or green
-99999 to 99999 or -99990 to 99990 (count by 10)
Minus sign, 2 red LED lamps
A-to-D Conversion
Technique
A-to-D Rate
Output Update
Display Update
Concurrent Slope(Pat 5,262,780)
60/s at 60 Hz, 50/s at 50 Hz
56/s at 60 Hz, 47/s at 50 Hz
3.5/s at 60 Hz, 3/s at 50 Hz
Accuracy
Span Tempco
Zero Tempco
0.003% of reading/°C
0.1 count/°C
Noise Rejection
CMR, DC to 60 Hz
NMR at 50/60 Hz
130 dB
90 dB with min filtering
Maximum Signal
Max applied voltage
Current protection
600 Vac for 20, 200 & 600 V ranges, 125 Vac other ranges
25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A
Power
Voltage, standard
Voltage, optional
Frequency
Power Isolation
95-240 Vac ±10% or 90-300 Vdc (DC operation not UL approved)
12-30 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
Excitation Output
5 Vdc
10 Vdc
24 Vdc
Output Isolation
5 Vdc ±5%, 100 mA
10 Vdc ±5%, 120 mA
24 Vdc ±5%, 50 mA
50 Vdc to meter ground
Analog Output (optional)
Output levels
Compliance
Scaling
Resolution
Isolation
0-10V, 0-20 mA, 4-20 mA (jumper selectable)
2 mA at 10V (5 kOhm load), 12V at 20 mA (0-60 ohm load)
Zero and full scale adjustable from -99999 to +99999
12 bits (0.025% of full scale)
250V rms working, 2.3 kV rms per 1 min test
Dual Contact Relay Outputs (optional)
Relay Type
Load Rating
Isolation
Form C
8A at 250 Vac or 24 Vdc
250V rms working, 2.3 kV rms per 1 min test
Dual Solid State Relay Outputs (optional)
Relay Type
Load Rating
Isolation
SPST, normally open, Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance
250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board Selections
Protocols
Data Rates
Digital Addresses
Isolation
RS232, RS485, Modbus RS485
Modbus RTU, Modbus ASCII, simpler Laurel ASCII
300 to 19200 bps
247 (Modbus), 31 (Laurel ASCII),
250V rms working, 2.3 kV rms per 1 min test
Signal Connections
Signal connections for Laurel process digital panel meter
Environmental
Operating Temp.
Storage Temp.
Relative Humidity
Protection
0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted

Application Examples

Wiring a Laureate digital panel meter for a potentiometric pot follower application
Potentiometer Application

In potentiometric (or potentiometer follower) applications, the signal from a sliding contact voltage divider can be converted to engineering units such as position, level or percentage. By operating in a ratiometric mode, the meter will remove any effects caused by variations in the excitation supply.

For use with a 1 kohm potentiometer, the recommended applied excitation voltage is 10 V, and a 2 kohm resistor should be placed in series with the excitation output and excitation return leads. This will allow the meter's 2.0000 V scale with a high input impedance of 1 Gohm to be used.
  

dcdraw4.gif (1014 bytes)

Using a digital panel meter to power a two-wire transmitter

Using a digital panel meter with peak detection for destructive testing
Powering two-wire transmitters
 
The isolated 24 Vdc, 50 mA excitation output, which is standard with all Laureate meters, is ideal for powering two-wire, 4-20 mA transmitters. The same two wires are used to apply voltage and carry the output current. Inside the meter, the 4-20 mA current is dropped across a 10
ohm resistor and sets up a 40-200 mV voltage, which is then sensed by the meter and scaled to engineering units.

Testing with peak detection
 
Destructive testing is an ideal application for the Laureate strain meter. Peak readings are automatically captured at rates up to 60 per second, while the display updates at a legible 3.5 readings per second. The peak reading can be recalled at the push of a button or be transmitted via RS-232 or RS-485.
The meter provides isolated 10 Vdc power for up to four (4) the strain gauges and can be scaled to read out directly in engineering units from -99,999 to +99,999.

Using a linearizing digital panel meter Using digital panel meter to obtain rate from successive readings
Custom curve linearization

The Laureate DC meter with the Extended main board option allows exceptionally accurate custom curve linearization. For setup, up to 180 data points can be entered into a spreadsheet. The system then creates multiple non-linear spline-fit segments, which provide much better accuracy than linear segments. Illustrated, is the readout of volume of irregularly shaped tanks based on measured liquid level or pressure. Altimeters and thermistors are further applications.

Rate from successive readings

The Extended computer board allows the display of rate based on successive readings, for instance flow rate based on changes in liquid level or static pressure in a tank. In the above illustration, the meter displays the rate in gallons at which a horizontal tank is being emptied. The input to the meter can be nonlinear, since only the linearized readings are compared for the determination of rate.

Ordering Guide
Laureate™ Process, Strain & Potentiometer Follower Meters
 Click on the radio buttons to build a model number with pricing.

   Quantity
DPM
Type
L    Digital Panel Meter. $220
Main
Board
Standard Main Board, Green LEDs.
Standard Main Board, Red LEDs.
Extended Main Board, Green LEDs.
Extended Main Board, Red LEDs.
NC
NC

$40

$40
Note: Extended capability is required for custom curve linearization or for display of time rate of change, such as flow rate from changing tank level or acceleration from changing speed.  
Power Isolated 95-240 Vac ±10%
Isolated 12-30 Vac & 10-48 Vdc.
NC
$30
Setpoint
Output
None.
Dual 8A Contact Relays.
Isolated Dual Solid State Relays.
NC
$80

$55
Analog
Output
None.
Isolated 0-20 mA & 0-10 V.
NC
$90
Digital
Interface
None.
Isolated RS-232.
Isolated RS-485.
Isolated Modbus RS-485.
NC
$60

$80

$90
Signal
Input
Process Signals (e.g., 4-20 mA, 0-5 V)
P    Default Scaling. 4-20 mA = 0-100.00.
P1  Custom Scaling.
In the write-in field of your invoice, specify min input, min reading; max input, max reading.
 
NC

$10
Strain Gage, Potentiometer Follower (4-wire ratio)
SG    Default Scaling. 0-200 mV = 0-100.00.
SG1  Custom Scaling.
In the write-in field of your invoice, specify min input, min reading; max input, max reading.
 
NC

$10
Note: The same DC signal conditioner board can be user-configured for process, strain, potentiometer follower, DC Volts and DC Amps. It is precalibrated in EEPROM for all Laureate DC Volt and DC Amp ranges.  
Add-on
Options
EB  Extra-bright Red LED Display
BL
  Blank lens without button pads
CBL01  RJ11-to-DB9 cable
CBL02
  USB-to-DB9 adapter
IPC  Clear front panel cover sealed to NEMA 4X / IP65
BOX1 
NEMA-4X wall-mount enclosure
BOX2 
NEMA-4X wall-mount enclosure plus IPC
$30
NC

$19

$39

$40

$140

$180
 
Configured model number L10000P
Configured price per model $220
Quantity 1
Extended price $220
 

 

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

  
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