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.
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DC-Meter
Features
  • Reads process signals from ±200 mV to ±300V and ±2 mA to ±5A
  • Zero adjust from -99,999 to +99,999, span adjust from 0 to ±99,999
  • Up to 60 readings per second
  • Transducer excitation output, 5, 10 or 24 Vdc (isolated)
  • Universal 85-264 Vac / 90 -300 Vdc or 10-48 Vdc / 12-32 Vac power
  • Wide choice of options:
    - 2 or 4 relays, mechanical or solid state (isolated)
    - Analog output, 4-20 mA, 0-10V, or -10V to +10V (isolated)
    - Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
    - Custom curve linearization, rate from consecutive readings
Description
dc-panel-meter

Laureate™ digital process and strain panel meters are a cost-effective solution to monitoring and control applications which require zero and span adjustment for process signals such as 4-20 mA, 0-5 V, 0-10 V, or strain gauges. The meters are also suitable for potentiometer follower applications, where the transducer output is a changing resistance.

The display is scalable 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.

Strain gauges with a 20 mV output can be scaled to display up to 10,000 counts with a 4-wire ratiometric connection, while 200 mV outputs of can be scaled to display up to 99,999 counts. For higher sensitivity, 20 mV signals can be scaled to 99,999 counts with a 4- or 6-wire connection using the Laureate load cell meter.

The 200.00 mV and 2.000 V ranges provide a high input impedance of 1 Gohm to minimize the load on the voltage signal.

PowerAn isolated 5, 10 or 24 Vdc isolated excitation output is standard to power external transducers and transmitters. Up to 120 mA is provided at 10V to power four 350 ohm load cells in parallel. When powering strain gauges, load cells or potentiometers, the excitation output is monitored by the meter to eliminate errors due to voltage variations.

High read rates at up to 60 or 50 conversions per second while integrating the signal over a full power cycle are provided by Concurrent Slope (US Pat 5,262,780) analog-to-digital conversion. High read rates are ideal for peak or valley capture, real-time computer interface, and control.

Peak and valley values are automatically captured. These may be displayed via a front panel pushbutton command or control signal at the rear connector, or be transmitted as serial data.

Digital filtering is selectable for electrically noisy environments, including a batch averaging filter and an adaptive moving average filter which provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, that filter adapts by briefly switching to the shortest time to follow the change, then reverts back to the selected time constant. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise.

Auto-tare allows the display to be zeroed for any input signal 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.

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.

Designed for system use. Optional plug-in boards for communications and control include Ethernet and other serial communication boards, dual or quad relay boards, and an isolated analog output board. Laureates may be powered from 85-264 Vac or optionally from 12-32 Vac or 10-48 Vdc. The display is available with red or green LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys can be locked out for simplified usage and security. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.

Specifications Back to top
DC Voltage Range Resolution Input Resistance 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 GΩ
1 GΩ
10 MΩ
10 MΩ
10 MΩ
10 MΩ
0.01% FS
0.01% FS
0.01% FS
0.01% FS
0.02% FS
0.02% FS
* 600V range not ETL certified

DC Current
DC Current Range Resolution Input Resistance 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
100Ω
10Ω

0.01Ω
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 rate
Display update rate
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
Error at 25°C
Span tempco
Zero tempco
0.01% FS ± 2 counts (except 5A range)
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
85-264 Vac or 90-300 Vdc (DC operation not ETL certified)
12-32 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
Excitation Output (standard)
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
Current compliance
Voltage compliance
Scaling
Resolution
Isolation
4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable)
2 mA at 10V ( > 5 kΩ load)
12V at 20 mA ( < 600Ω load)
Zero and full scale adjustable from -99999 to +99999
16 bits (0.0015% of full scale)
250V rms working, 2.3 kV rms per 1 min test
Relay Outputs (optional)
Relay types

Current ratings

Output common
Isolation
2 Form C contact relays or 4 Form A contact relays (NO)
2 or 4 Form A, AC/DC solid state relays (NO)
8A at 250 Vac or 24 Vdc for contact relays
120 mA at 140 Vac or 180 Vdc for solid state relays
Isolated commons for dual relays or each pair of quad relays
250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board selections

Protocols
Data rates
Digital addresses
Isolation
Ethernet, Ethernet-to-RS485 server, USB, USB-to-RS485 server, RS485 (dual RJ11), RS485 Modbus (dual RJ45), RS232.
Modbus RTU, Modbus ASCII, Laurel ASCII protocol
300 to 19200 baud
247 (Modbus), 31 (Laurel ASCII),
250V rms working, 2.3 kV rms per 1 min test
Signal Connections
Environmental
Operating temperature
Storage temperature
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

Applications Back to top
Potentiometer Follower 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.

 
Powering two-wire transmitters   Testing with peak detection
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.   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.
 
Custom curve linearization   Rate from successive readings
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.   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 Back to top
Laureate™ Process, Strain & Potentiometer Follower Meters
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide). Prices are in US dollars and do not include shipping or duty charges (export sales).

Configured model number L10000P
Configured price per model $230
Quantity 1
Extended price $230
   Quantity
DPM Type
L Digital Panel Meter.
$230
Main
Board
1 Standard Main Board, Green LEDs
2 Standard Main Board, Red LEDs
3 Extended Main Board, Green LEDs
4 Extended Main Board, Red LEDs
$0
$0
$30
$30

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
0 Isolated 85-264 Vac or 90-300 Vdc
1 Isolated 12-32 Vac or 10-48 Vdc
$0
$30
Relay
Output
(isolated)
0 None.
1 Two 8A Contact Relays
2 Two 120 mA Solid State Relays
3 Four 8A Contact Relays
4 Four 120 mA Solid State Relays
$0
$80
$55
$100
$75
Analog
Output
(isolated)
0 None
1 Isolated 4-20 mA, 0-20 mA, 0-10 V, -10 to +10V
$0
$90
Digital
Interface
(isolated)
0 None
1 RS232
2 RS485 (dual RJ11 connectors)
4 RS485 Modbus (dual RJ45 connectors)
5 USB
6 USB-to-RS485 converter
7 Ethernet
8 Ethernet-to-RS485 converter
$0
$60
$80
$90
$60
$100
$120
$150
Signal
Input
(isolated)
Process Signals (e.g., 4-20 mA, 0-5 V)
P Field scalable. Default Scaling is 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.
$0
$10
Strain Gage, Potentiometer Follower (4-wire ratio)
SG Field Scalable. Default Scaling is 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.
$0
$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
CBL01  RS232 cable, RJ11 to DB9, 7 ft. Connects RS232 ports of meter
and PC.
CBL02 USB to RS232 adapter cable. Combination of CBL02 and CBL01
connects meter RS232 port to PC USB port. Combination of CBL02 and
CBL04 connects transmitter RS232 terminals to PC USB port.
CBL03-1 6-wire data cable, RJ11 to RJ11, 1 ft. Used to daisy chain meters
via RS485.
CBL03-7 6-wire data cable, RJ11 to RJ11, 7 ft. Used to daisy chain meters
via RS485.
CBL05 USB cable, A-B. Connects USB ports of meter and PC.
CBL06  USB to RS485 adapter cable, half duplex, RJ11 to USB. Connects
meter RS485 port to PC USB port.
NL  Meter Lens with Button Pads but no Laurels Logo
BL  Meter Lens without Button Pads or Laurels Logo
IPC Splash-proof Cover
BOX1 NEMA-4 Enclosure
BOX2 NEMA-4 Enclosure plus IPC
$19
$39
$8
$8
$15
$39
$5
$5
$40
$140
$180
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